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S390:

Browse Source 
* ultravisor communication device driver
 
 * fix TEID on terminating storage key ops
 
 RISC-V:
 
 * Added Sv57x4 support for G-stage page table
 
 * Added range based local HFENCE functions
 
 * Added remote HFENCE functions based on VCPU requests
 
 * Added ISA extension registers in ONE_REG interface
 
 * Updated KVM RISC-V maintainers entry to cover selftests support
 
 ARM:
 
 * Add support for the ARMv8.6 WFxT extension
 
 * Guard pages for the EL2 stacks
 
 * Trap and emulate AArch32 ID registers to hide unsupported features
 
 * Ability to select and save/restore the set of hypercalls exposed
   to the guest
 
 * Support for PSCI-initiated suspend in collaboration with userspace
 
 * GICv3 register-based LPI invalidation support
 
 * Move host PMU event merging into the vcpu data structure
 
 * GICv3 ITS save/restore fixes
 
 * The usual set of small-scale cleanups and fixes
 
 x86:
 
 * New ioctls to get/set TSC frequency for a whole VM
 
 * Allow userspace to opt out of hypercall patching
 
 * Only do MSR filtering for MSRs accessed by rdmsr/wrmsr
 
 AMD SEV improvements:
 
 * Add KVM_EXIT_SHUTDOWN metadata for SEV-ES
 
 * V_TSC_AUX support
 
 Nested virtualization improvements for AMD:
 
 * Support for "nested nested" optimizations (nested vVMLOAD/VMSAVE,
   nested vGIF)
 
 * Allow AVIC to co-exist with a nested guest running
 
 * Fixes for LBR virtualizations when a nested guest is running,
   and nested LBR virtualization support
 
 * PAUSE filtering for nested hypervisors
 
 Guest support:
 
 * Decoupling of vcpu_is_preempted from PV spinlocks
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm updates from Paolo Bonzini:
 "S390:

   - ultravisor communication device driver

   - fix TEID on terminating storage key ops

  RISC-V:

   - Added Sv57x4 support for G-stage page table

   - Added range based local HFENCE functions

   - Added remote HFENCE functions based on VCPU requests

   - Added ISA extension registers in ONE_REG interface

   - Updated KVM RISC-V maintainers entry to cover selftests support

  ARM:

   - Add support for the ARMv8.6 WFxT extension

   - Guard pages for the EL2 stacks

   - Trap and emulate AArch32 ID registers to hide unsupported features

   - Ability to select and save/restore the set of hypercalls exposed to
     the guest

   - Support for PSCI-initiated suspend in collaboration with userspace

   - GICv3 register-based LPI invalidation support

   - Move host PMU event merging into the vcpu data structure

   - GICv3 ITS save/restore fixes

   - The usual set of small-scale cleanups and fixes

  x86:

   - New ioctls to get/set TSC frequency for a whole VM

   - Allow userspace to opt out of hypercall patching

   - Only do MSR filtering for MSRs accessed by rdmsr/wrmsr

  AMD SEV improvements:

   - Add KVM_EXIT_SHUTDOWN metadata for SEV-ES

   - V_TSC_AUX support

  Nested virtualization improvements for AMD:

   - Support for "nested nested" optimizations (nested vVMLOAD/VMSAVE,
     nested vGIF)

   - Allow AVIC to co-exist with a nested guest running

   - Fixes for LBR virtualizations when a nested guest is running, and
     nested LBR virtualization support

   - PAUSE filtering for nested hypervisors

  Guest support:

   - Decoupling of vcpu_is_preempted from PV spinlocks"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (199 commits)
  KVM: x86: Fix the intel_pt PMI handling wrongly considered from guest
  KVM: selftests: x86: Sync the new name of the test case to .gitignore
  Documentation: kvm: reorder ARM-specific section about KVM_SYSTEM_EVENT_SUSPEND
  x86, kvm: use correct GFP flags for preemption disabled
  KVM: LAPIC: Drop pending LAPIC timer injection when canceling the timer
  x86/kvm: Alloc dummy async #PF token outside of raw spinlock
  KVM: x86: avoid calling x86 emulator without a decoded instruction
  KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak
  x86/fpu: KVM: Set the base guest FPU uABI size to sizeof(struct kvm_xsave)
  s390/uv_uapi: depend on CONFIG_S390
  KVM: selftests: x86: Fix test failure on arch lbr capable platforms
  KVM: LAPIC: Trace LAPIC timer expiration on every vmentry
  KVM: s390: selftest: Test suppression indication on key prot exception
  KVM: s390: Don't indicate suppression on dirtying, failing memop
  selftests: drivers/s390x: Add uvdevice tests
  drivers/s390/char: Add Ultravisor io device
  MAINTAINERS: Update KVM RISC-V entry to cover selftests support
  RISC-V: KVM: Introduce ISA extension register
  RISC-V: KVM: Cleanup stale TLB entries when host CPU changes
  RISC-V: KVM: Add remote HFENCE functions based on VCPU requests
  ...
This commit is contained in:
Linus Torvalds 2022-05-26 14:20:14 -07:00
commit bf9095424d
141 changed files with 7851 additions and 2343 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/arm64/cpu-feature-registers.rst
View File

@ -290,6 +290,8 @@ infrastructure:
+------------------------------+---------+---------+
| RPRES | [7-4] | y |
+------------------------------+---------+---------+
| WFXT | [3-0] | y |
+------------------------------+---------+---------+
Appendix I: Example

4
Documentation/arm64/elf_hwcaps.rst
View File

@ -297,6 +297,10 @@ HWCAP2_SME_FA64
Functionality implied by ID_AA64SMFR0_EL1.FA64 == 0b1.
HWCAP2_WFXT
Functionality implied by ID_AA64ISAR2_EL1.WFXT == 0b0010.
4. Unused AT_HWCAP bits
-----------------------

252
Documentation/virt/kvm/api.rst
View File

@ -982,12 +982,22 @@ memory.
__u8 pad2[30];
};
If the KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL flag is returned from the
KVM_CAP_XEN_HVM check, it may be set in the flags field of this ioctl.
This requests KVM to generate the contents of the hypercall page
automatically; hypercalls will be intercepted and passed to userspace
through KVM_EXIT_XEN. In this case, all of the blob size and address
fields must be zero.
If certain flags are returned from the KVM_CAP_XEN_HVM check, they may
be set in the flags field of this ioctl:
The KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL flag requests KVM to generate
the contents of the hypercall page automatically; hypercalls will be
intercepted and passed to userspace through KVM_EXIT_XEN. In this
ase, all of the blob size and address fields must be zero.
The KVM_XEN_HVM_CONFIG_EVTCHN_SEND flag indicates to KVM that userspace
will always use the KVM_XEN_HVM_EVTCHN_SEND ioctl to deliver event
channel interrupts rather than manipulating the guest's shared_info
structures directly. This, in turn, may allow KVM to enable features
such as intercepting the SCHEDOP_poll hypercall to accelerate PV
spinlock operation for the guest. Userspace may still use the ioctl
to deliver events if it was advertised, even if userspace does not
send this indication that it will always do so
No other flags are currently valid in the struct kvm_xen_hvm_config.
@ -1476,14 +1486,43 @@ Possible values are:
[s390]
KVM_MP_STATE_LOAD the vcpu is in a special load/startup state
[s390]
KVM_MP_STATE_SUSPENDED the vcpu is in a suspend state and is waiting
for a wakeup event [arm64]
========================== ===============================================
On x86, this ioctl is only useful after KVM_CREATE_IRQCHIP. Without an
in-kernel irqchip, the multiprocessing state must be maintained by userspace on
these architectures.
For arm64/riscv:
^^^^^^^^^^^^^^^^
For arm64:
^^^^^^^^^^
If a vCPU is in the KVM_MP_STATE_SUSPENDED state, KVM will emulate the
architectural execution of a WFI instruction.
If a wakeup event is recognized, KVM will exit to userspace with a
KVM_SYSTEM_EVENT exit, where the event type is KVM_SYSTEM_EVENT_WAKEUP. If
userspace wants to honor the wakeup, it must set the vCPU's MP state to
KVM_MP_STATE_RUNNABLE. If it does not, KVM will continue to await a wakeup
event in subsequent calls to KVM_RUN.
.. warning::
If userspace intends to keep the vCPU in a SUSPENDED state, it is
strongly recommended that userspace take action to suppress the
wakeup event (such as masking an interrupt). Otherwise, subsequent
calls to KVM_RUN will immediately exit with a KVM_SYSTEM_EVENT_WAKEUP
event and inadvertently waste CPU cycles.
Additionally, if userspace takes action to suppress a wakeup event,
it is strongly recommended that it also restores the vCPU to its
original state when the vCPU is made RUNNABLE again. For example,
if userspace masked a pending interrupt to suppress the wakeup,
the interrupt should be unmasked before returning control to the
guest.
For riscv:
^^^^^^^^^^
The only states that are valid are KVM_MP_STATE_STOPPED and
KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not.
@ -1887,22 +1926,25 @@ the future.
4.55 KVM_SET_TSC_KHZ
--------------------
:Capability: KVM_CAP_TSC_CONTROL
:Capability: KVM_CAP_TSC_CONTROL / KVM_CAP_VM_TSC_CONTROL
:Architectures: x86
:Type: vcpu ioctl
:Type: vcpu ioctl / vm ioctl
:Parameters: virtual tsc_khz
:Returns: 0 on success, -1 on error
Specifies the tsc frequency for the virtual machine. The unit of the
frequency is KHz.
If the KVM_CAP_VM_TSC_CONTROL capability is advertised, this can also
be used as a vm ioctl to set the initial tsc frequency of subsequently
created vCPUs.
4.56 KVM_GET_TSC_KHZ
--------------------
:Capability: KVM_CAP_GET_TSC_KHZ
:Capability: KVM_CAP_GET_TSC_KHZ / KVM_CAP_VM_TSC_CONTROL
:Architectures: x86
:Type: vcpu ioctl
:Type: vcpu ioctl / vm ioctl
:Parameters: none
:Returns: virtual tsc-khz on success, negative value on error
@ -2601,6 +2643,24 @@ EINVAL.
After the vcpu's SVE configuration is finalized, further attempts to
write this register will fail with EPERM.
arm64 bitmap feature firmware pseudo-registers have the following bit pattern::
0x6030 0000 0016 <regno:16>
The bitmap feature firmware registers exposes the hypercall services that
are available for userspace to configure. The set bits corresponds to the
services that are available for the guests to access. By default, KVM
sets all the supported bits during VM initialization. The userspace can
discover the available services via KVM_GET_ONE_REG, and write back the
bitmap corresponding to the features that it wishes guests to see via
KVM_SET_ONE_REG.
Note: These registers are immutable once any of the vCPUs of the VM has
run at least once. A KVM_SET_ONE_REG in such a scenario will return
a -EBUSY to userspace.
(See Documentation/virt/kvm/arm/hypercalls.rst for more details.)
MIPS registers are mapped using the lower 32 bits. The upper 16 of that is
the register group type:
@ -3754,12 +3814,18 @@ in case of KVM_S390_MEMOP_F_CHECK_ONLY), the ioctl returns a positive
error number indicating the type of exception. This exception is also
raised directly at the corresponding VCPU if the flag
KVM_S390_MEMOP_F_INJECT_EXCEPTION is set.
On protection exceptions, unless specified otherwise, the injected
translation-exception identifier (TEID) indicates suppression.
If the KVM_S390_MEMOP_F_SKEY_PROTECTION flag is set, storage key
protection is also in effect and may cause exceptions if accesses are
prohibited given the access key designated by "key"; the valid range is 0..15.
KVM_S390_MEMOP_F_SKEY_PROTECTION is available if KVM_CAP_S390_MEM_OP_EXTENSION
is > 0.
Since the accessed memory may span multiple pages and those pages might have
different storage keys, it is possible that a protection exception occurs
after memory has been modified. In this case, if the exception is injected,
the TEID does not indicate suppression.
Absolute read/write:
^^^^^^^^^^^^^^^^^^^^
@ -5216,7 +5282,25 @@ have deterministic behavior.
struct {
__u64 gfn;
} shared_info;
__u64 pad[4];
struct {
__u32 send_port;
__u32 type; /* EVTCHNSTAT_ipi / EVTCHNSTAT_interdomain */
__u32 flags;
union {
struct {
__u32 port;
__u32 vcpu;
__u32 priority;
} port;
struct {
__u32 port; /* Zero for eventfd */
__s32 fd;
} eventfd;
__u32 padding[4];
} deliver;
} evtchn;
__u32 xen_version;
__u64 pad[8];
} u;
};
@ -5247,6 +5331,30 @@ KVM_XEN_ATTR_TYPE_SHARED_INFO
KVM_XEN_ATTR_TYPE_UPCALL_VECTOR
Sets the exception vector used to deliver Xen event channel upcalls.
This is the HVM-wide vector injected directly by the hypervisor
(not through the local APIC), typically configured by a guest via
HVM_PARAM_CALLBACK_IRQ.
KVM_XEN_ATTR_TYPE_EVTCHN
This attribute is available when the KVM_CAP_XEN_HVM ioctl indicates
support for KVM_XEN_HVM_CONFIG_EVTCHN_SEND features. It configures
an outbound port number for interception of EVTCHNOP_send requests
from the guest. A given sending port number may be directed back
to a specified vCPU (by APIC ID) / port / priority on the guest,
or to trigger events on an eventfd. The vCPU and priority can be
changed by setting KVM_XEN_EVTCHN_UPDATE in a subsequent call,
but other fields cannot change for a given sending port. A port
mapping is removed by using KVM_XEN_EVTCHN_DEASSIGN in the flags
field.
KVM_XEN_ATTR_TYPE_XEN_VERSION
This attribute is available when the KVM_CAP_XEN_HVM ioctl indicates
support for KVM_XEN_HVM_CONFIG_EVTCHN_SEND features. It configures
the 32-bit version code returned to the guest when it invokes the
XENVER_version call; typically (XEN_MAJOR << 16 | XEN_MINOR). PV
Xen guests will often use this to as a dummy hypercall to trigger
event channel delivery, so responding within the kernel without
exiting to userspace is beneficial.
4.127 KVM_XEN_HVM_GET_ATTR
--------------------------
@ -5258,7 +5366,8 @@ KVM_XEN_ATTR_TYPE_UPCALL_VECTOR
:Returns: 0 on success, < 0 on error
Allows Xen VM attributes to be read. For the structure and types,
see KVM_XEN_HVM_SET_ATTR above.
see KVM_XEN_HVM_SET_ATTR above. The KVM_XEN_ATTR_TYPE_EVTCHN
attribute cannot be read.
4.128 KVM_XEN_VCPU_SET_ATTR
---------------------------
@ -5285,6 +5394,13 @@ see KVM_XEN_HVM_SET_ATTR above.
__u64 time_blocked;
__u64 time_offline;
} runstate;
__u32 vcpu_id;
struct {
__u32 port;
__u32 priority;
__u64 expires_ns;
} timer;
__u8 vector;
} u;
};
@ -5326,6 +5442,27 @@ KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST
or RUNSTATE_offline) to set the current accounted state as of the
adjusted state_entry_time.
KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID
This attribute is available when the KVM_CAP_XEN_HVM ioctl indicates
support for KVM_XEN_HVM_CONFIG_EVTCHN_SEND features. It sets the Xen
vCPU ID of the given vCPU, to allow timer-related VCPU operations to
be intercepted by KVM.
KVM_XEN_VCPU_ATTR_TYPE_TIMER
This attribute is available when the KVM_CAP_XEN_HVM ioctl indicates
support for KVM_XEN_HVM_CONFIG_EVTCHN_SEND features. It sets the
event channel port/priority for the VIRQ_TIMER of the vCPU, as well
as allowing a pending timer to be saved/restored.
KVM_XEN_VCPU_ATTR_TYPE_UPCALL_VECTOR
This attribute is available when the KVM_CAP_XEN_HVM ioctl indicates
support for KVM_XEN_HVM_CONFIG_EVTCHN_SEND features. It sets the
per-vCPU local APIC upcall vector, configured by a Xen guest with
the HVMOP_set_evtchn_upcall_vector hypercall. This is typically
used by Windows guests, and is distinct from the HVM-wide upcall
vector configured with HVM_PARAM_CALLBACK_IRQ.
4.129 KVM_XEN_VCPU_GET_ATTR
---------------------------
@ -5645,6 +5782,25 @@ enabled with ``arch_prctl()``, but this may change in the future.
The offsets of the state save areas in struct kvm_xsave follow the contents
of CPUID leaf 0xD on the host.
4.135 KVM_XEN_HVM_EVTCHN_SEND
-----------------------------
:Capability: KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_EVTCHN_SEND
:Architectures: x86
:Type: vm ioctl
:Parameters: struct kvm_irq_routing_xen_evtchn
:Returns: 0 on success, < 0 on error
::
struct kvm_irq_routing_xen_evtchn {
__u32 port;
__u32 vcpu;
__u32 priority;
};
This ioctl injects an event channel interrupt directly to the guest vCPU.
5. The kvm_run structure
========================
@ -5987,6 +6143,9 @@ should put the acknowledged interrupt vector into the 'epr' field.
#define KVM_SYSTEM_EVENT_SHUTDOWN 1
#define KVM_SYSTEM_EVENT_RESET 2
#define KVM_SYSTEM_EVENT_CRASH 3
#define KVM_SYSTEM_EVENT_WAKEUP 4
#define KVM_SYSTEM_EVENT_SUSPEND 5
#define KVM_SYSTEM_EVENT_SEV_TERM 6
__u32 type;
__u32 ndata;
__u64 data[16];
@ -6011,6 +6170,13 @@ Valid values for 'type' are:
has requested a crash condition maintenance. Userspace can choose
to ignore the request, or to gather VM memory core dump and/or
reset/shutdown of the VM.
- KVM_SYSTEM_EVENT_SEV_TERM -- an AMD SEV guest requested termination.
The guest physical address of the guest's GHCB is stored in `data[0]`.
- KVM_SYSTEM_EVENT_WAKEUP -- the exiting vCPU is in a suspended state and
KVM has recognized a wakeup event. Userspace may honor this event by
marking the exiting vCPU as runnable, or deny it and call KVM_RUN again.
- KVM_SYSTEM_EVENT_SUSPEND -- the guest has requested a suspension of
the VM.
If KVM_CAP_SYSTEM_EVENT_DATA is present, the 'data' field can contain
architecture specific information for the system-level event. Only
@ -6027,6 +6193,32 @@ Previous versions of Linux defined a `flags` member in this struct. The
field is now aliased to `data[0]`. Userspace can assume that it is only
written if ndata is greater than 0.
For arm/arm64:
--------------
KVM_SYSTEM_EVENT_SUSPEND exits are enabled with the
KVM_CAP_ARM_SYSTEM_SUSPEND VM capability. If a guest invokes the PSCI
SYSTEM_SUSPEND function, KVM will exit to userspace with this event
type.
It is the sole responsibility of userspace to implement the PSCI
SYSTEM_SUSPEND call according to ARM DEN0022D.b 5.19 "SYSTEM_SUSPEND".
KVM does not change the vCPU's state before exiting to userspace, so
the call parameters are left in-place in the vCPU registers.
Userspace is _required_ to take action for such an exit. It must
either:
- Honor the guest request to suspend the VM. Userspace can request
in-kernel emulation of suspension by setting the calling vCPU's
state to KVM_MP_STATE_SUSPENDED. Userspace must configure the vCPU's
state according to the parameters passed to the PSCI function when
the calling vCPU is resumed. See ARM DEN0022D.b 5.19.1 "Intended use"
for details on the function parameters.
- Deny the guest request to suspend the VM. See ARM DEN0022D.b 5.19.2
"Caller responsibilities" for possible return values.
::
/* KVM_EXIT_IOAPIC_EOI */
@ -7147,6 +7339,15 @@ The valid bits in cap.args[0] are:
Additionally, when this quirk is disabled,
KVM clears CPUID.01H:ECX[bit 3] if
IA32_MISC_ENABLE[bit 18] is cleared.
KVM_X86_QUIRK_FIX_HYPERCALL_INSN By default, KVM rewrites guest
VMMCALL/VMCALL instructions to match the
vendor's hypercall instruction for the
system. When this quirk is disabled, KVM
will no longer rewrite invalid guest
hypercall instructions. Executing the
incorrect hypercall instruction will
generate a #UD within the guest.
=================================== ============================================
8. Other capabilities.
@ -7624,8 +7825,9 @@ PVHVM guests. Valid flags are::
#define KVM_XEN_HVM_CONFIG_HYPERCALL_MSR (1 << 0)
#define KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL (1 << 1)
#define KVM_XEN_HVM_CONFIG_SHARED_INFO (1 << 2)
#define KVM_XEN_HVM_CONFIG_RUNSTATE (1 << 2)
#define KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL (1 << 3)
#define KVM_XEN_HVM_CONFIG_RUNSTATE (1 << 3)
#define KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL (1 << 4)
#define KVM_XEN_HVM_CONFIG_EVTCHN_SEND (1 << 5)
The KVM_XEN_HVM_CONFIG_HYPERCALL_MSR flag indicates that the KVM_XEN_HVM_CONFIG
ioctl is available, for the guest to set its hypercall page.
@ -7649,6 +7851,14 @@ The KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL flag indicates that IRQ routing entries
of the type KVM_IRQ_ROUTING_XEN_EVTCHN are supported, with the priority
field set to indicate 2 level event channel delivery.
The KVM_XEN_HVM_CONFIG_EVTCHN_SEND flag indicates that KVM supports
injecting event channel events directly into the guest with the
KVM_XEN_HVM_EVTCHN_SEND ioctl. It also indicates support for the
KVM_XEN_ATTR_TYPE_EVTCHN/XEN_VERSION HVM attributes and the
KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID/TIMER/UPCALL_VECTOR vCPU attributes.
related to event channel delivery, timers, and the XENVER_version
interception.
8.31 KVM_CAP_PPC_MULTITCE
-------------------------
@ -7736,6 +7946,16 @@ At this time, KVM_PMU_CAP_DISABLE is the only capability. Setting
this capability will disable PMU virtualization for that VM. Usermode
should adjust CPUID leaf 0xA to reflect that the PMU is disabled.
8.36 KVM_CAP_ARM_SYSTEM_SUSPEND
-------------------------------
:Capability: KVM_CAP_ARM_SYSTEM_SUSPEND
:Architectures: arm64
:Type: vm
When enabled, KVM will exit to userspace with KVM_EXIT_SYSTEM_EVENT of
type KVM_SYSTEM_EVENT_SUSPEND to process the guest suspend request.
9. Known KVM API problems
=========================

138
Documentation/virt/kvm/arm/hypercalls.rst Normal file
View File

@ -0,0 +1,138 @@
.. SPDX-License-Identifier: GPL-2.0
=======================
ARM Hypercall Interface
=======================
KVM handles the hypercall services as requested by the guests. New hypercall
services are regularly made available by the ARM specification or by KVM (as
vendor services) if they make sense from a virtualization point of view.
This means that a guest booted on two different versions of KVM can observe
two different "firmware" revisions. This could cause issues if a given guest
is tied to a particular version of a hypercall service, or if a migration
causes a different version to be exposed out of the blue to an unsuspecting
guest.
In order to remedy this situation, KVM exposes a set of "firmware
pseudo-registers" that can be manipulated using the GET/SET_ONE_REG
interface. These registers can be saved/restored by userspace, and set
to a convenient value as required.
The following registers are defined:
* KVM_REG_ARM_PSCI_VERSION:
KVM implements the PSCI (Power State Coordination Interface)
specification in order to provide services such as CPU on/off, reset
and power-off to the guest.
- Only valid if the vcpu has the KVM_ARM_VCPU_PSCI_0_2 feature set
(and thus has already been initialized)
- Returns the current PSCI version on GET_ONE_REG (defaulting to the
highest PSCI version implemented by KVM and compatible with v0.2)
- Allows any PSCI version implemented by KVM and compatible with
v0.2 to be set with SET_ONE_REG
- Affects the whole VM (even if the register view is per-vcpu)
* KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
Holds the state of the firmware support to mitigate CVE-2017-5715, as
offered by KVM to the guest via a HVC call. The workaround is described
under SMCCC_ARCH_WORKAROUND_1 in [1].
Accepted values are:
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL:
KVM does not offer
firmware support for the workaround. The mitigation status for the
guest is unknown.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL:
The workaround HVC call is
available to the guest and required for the mitigation.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED:
The workaround HVC call
is available to the guest, but it is not needed on this VCPU.
* KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
Holds the state of the firmware support to mitigate CVE-2018-3639, as
offered by KVM to the guest via a HVC call. The workaround is described
under SMCCC_ARCH_WORKAROUND_2 in [1]_.
Accepted values are:
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL:
A workaround is not
available. KVM does not offer firmware support for the workaround.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN:
The workaround state is
unknown. KVM does not offer firmware support for the workaround.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL:
The workaround is available,
and can be disabled by a vCPU. If
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED is set, it is active for
this vCPU.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED:
The workaround is always active on this vCPU or it is not needed.
Bitmap Feature Firmware Registers
---------------------------------
Contrary to the above registers, the following registers exposes the
hypercall services in the form of a feature-bitmap to the userspace. This
bitmap is translated to the services that are available to the guest.
There is a register defined per service call owner and can be accessed via
GET/SET_ONE_REG interface.
By default, these registers are set with the upper limit of the features
that are supported. This way userspace can discover all the usable
hypercall services via GET_ONE_REG. The user-space can write-back the
desired bitmap back via SET_ONE_REG. The features for the registers that
are untouched, probably because userspace isn't aware of them, will be
exposed as is to the guest.
Note that KVM will not allow the userspace to configure the registers
anymore once any of the vCPUs has run at least once. Instead, it will
return a -EBUSY.
The pseudo-firmware bitmap register are as follows:
* KVM_REG_ARM_STD_BMAP:
Controls the bitmap of the ARM Standard Secure Service Calls.
The following bits are accepted:
Bit-0: KVM_REG_ARM_STD_BIT_TRNG_V1_0:
The bit represents the services offered under v1.0 of ARM True Random
Number Generator (TRNG) specification, ARM DEN0098.
* KVM_REG_ARM_STD_HYP_BMAP:
Controls the bitmap of the ARM Standard Hypervisor Service Calls.
The following bits are accepted:
Bit-0: KVM_REG_ARM_STD_HYP_BIT_PV_TIME:
The bit represents the Paravirtualized Time service as represented by
ARM DEN0057A.
* KVM_REG_ARM_VENDOR_HYP_BMAP:
Controls the bitmap of the Vendor specific Hypervisor Service Calls.
The following bits are accepted:
Bit-0: KVM_REG_ARM_VENDOR_HYP_BIT_FUNC_FEAT
The bit represents the ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID
and ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID function-ids.
Bit-1: KVM_REG_ARM_VENDOR_HYP_BIT_PTP:
The bit represents the Precision Time Protocol KVM service.
Errors:
======= =============================================================
-ENOENT Unknown register accessed.
-EBUSY Attempt a 'write' to the register after the VM has started.
-EINVAL Invalid bitmap written to the register.
======= =============================================================
.. [1] https://developer.arm.com/-/media/developer/pdf/ARM_DEN_0070A_Firmware_interfaces_for_mitigating_CVE-2017-5715.pdf

2
Documentation/virt/kvm/arm/index.rst
View File

@ -8,6 +8,6 @@ ARM
:maxdepth: 2
hyp-abi
psci
hypercalls
pvtime
ptp_kvm

77
Documentation/virt/kvm/arm/psci.rst
View File

@ -1,77 +0,0 @@
.. SPDX-License-Identifier: GPL-2.0
=========================================
Power State Coordination Interface (PSCI)
=========================================
KVM implements the PSCI (Power State Coordination Interface)
specification in order to provide services such as CPU on/off, reset
and power-off to the guest.
The PSCI specification is regularly updated to provide new features,
and KVM implements these updates if they make sense from a virtualization
point of view.
This means that a guest booted on two different versions of KVM can
observe two different "firmware" revisions. This could cause issues if
a given guest is tied to a particular PSCI revision (unlikely), or if
a migration causes a different PSCI version to be exposed out of the
blue to an unsuspecting guest.
In order to remedy this situation, KVM exposes a set of "firmware
pseudo-registers" that can be manipulated using the GET/SET_ONE_REG
interface. These registers can be saved/restored by userspace, and set
to a convenient value if required.
The following register is defined:
* KVM_REG_ARM_PSCI_VERSION:
- Only valid if the vcpu has the KVM_ARM_VCPU_PSCI_0_2 feature set
(and thus has already been initialized)
- Returns the current PSCI version on GET_ONE_REG (defaulting to the
highest PSCI version implemented by KVM and compatible with v0.2)
- Allows any PSCI version implemented by KVM and compatible with
v0.2 to be set with SET_ONE_REG
- Affects the whole VM (even if the register view is per-vcpu)
* KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
Holds the state of the firmware support to mitigate CVE-2017-5715, as
offered by KVM to the guest via a HVC call. The workaround is described
under SMCCC_ARCH_WORKAROUND_1 in [1].
Accepted values are:
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL:
KVM does not offer
firmware support for the workaround. The mitigation status for the
guest is unknown.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL:
The workaround HVC call is
available to the guest and required for the mitigation.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED:
The workaround HVC call
is available to the guest, but it is not needed on this VCPU.
* KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
Holds the state of the firmware support to mitigate CVE-2018-3639, as
offered by KVM to the guest via a HVC call. The workaround is described
under SMCCC_ARCH_WORKAROUND_2 in [1]_.
Accepted values are:
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL:
A workaround is not
available. KVM does not offer firmware support for the workaround.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN:
The workaround state is
unknown. KVM does not offer firmware support for the workaround.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL:
The workaround is available,
and can be disabled by a vCPU. If
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED is set, it is active for
this vCPU.
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED:
The workaround is always active on this vCPU or it is not needed.
.. [1] https://developer.arm.com/-/media/developer/pdf/ARM_DEN_0070A_Firmware_interfaces_for_mitigating_CVE-2017-5715.pdf

4
Documentation/virt/kvm/x86/mmu.rst
View File

@ -202,6 +202,10 @@ Shadow pages contain the following information:
Is 1 if the MMU instance cannot use A/D bits. EPT did not have A/D
bits before Haswell; shadow EPT page tables also cannot use A/D bits
if the L1 hypervisor does not enable them.
role.passthrough:
The page is not backed by a guest page table, but its first entry
points to one. This is set if NPT uses 5-level page tables (host
CR4.LA57=1) and is shadowing L1's 4-level NPT (L1 CR4.LA57=1).
gfn:
Either the guest page table containing the translations shadowed by this
page, or the base page frame for linear translations. See role.direct.

5
MAINTAINERS
View File

@ -10830,6 +10830,8 @@ T: git git://github.com/kvm-riscv/linux.git
F: arch/riscv/include/asm/kvm*
F: arch/riscv/include/uapi/asm/kvm*
F: arch/riscv/kvm/
F: tools/testing/selftests/kvm/*/riscv/
F: tools/testing/selftests/kvm/riscv/
KERNEL VIRTUAL MACHINE for s390 (KVM/s390)
M: Christian Borntraeger <borntraeger@linux.ibm.com>
@ -10844,9 +10846,12 @@ F: Documentation/virt/kvm/s390*
F: arch/s390/include/asm/gmap.h
F: arch/s390/include/asm/kvm*
F: arch/s390/include/uapi/asm/kvm*
F: arch/s390/include/uapi/asm/uvdevice.h
F: arch/s390/kernel/uv.c
F: arch/s390/kvm/
F: arch/s390/mm/gmap.c
F: drivers/s390/char/uvdevice.c
F: tools/testing/selftests/drivers/s390x/uvdevice/
F: tools/testing/selftests/kvm/*/s390x/
F: tools/testing/selftests/kvm/s390x/

4
arch/arm64/include/asm/barrier.h
View File

@ -16,7 +16,11 @@
#define sev() asm volatile("sev" : : : "memory")
#define wfe() asm volatile("wfe" : : : "memory")
#define wfet(val) asm volatile("msr s0_3_c1_c0_0, %0" \
: : "r" (val) : "memory")
#define wfi() asm volatile("wfi" : : : "memory")
#define wfit(val) asm volatile("msr s0_3_c1_c0_1, %0" \
: : "r" (val) : "memory")
#define isb() asm volatile("isb" : : : "memory")
#define dmb(opt) asm volatile("dmb " #opt : : : "memory")

8
arch/arm64/include/asm/cputype.h
View File

@ -118,6 +118,10 @@
#define APPLE_CPU_PART_M1_ICESTORM 0x022
#define APPLE_CPU_PART_M1_FIRESTORM 0x023
#define APPLE_CPU_PART_M1_ICESTORM_PRO 0x024
#define APPLE_CPU_PART_M1_FIRESTORM_PRO 0x025
#define APPLE_CPU_PART_M1_ICESTORM_MAX 0x028
#define APPLE_CPU_PART_M1_FIRESTORM_MAX 0x029
#define MIDR_CORTEX_A53 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A53)
#define MIDR_CORTEX_A57 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A57)
@ -164,6 +168,10 @@
#define MIDR_HISI_TSV110 MIDR_CPU_MODEL(ARM_CPU_IMP_HISI, HISI_CPU_PART_TSV110)
#define MIDR_APPLE_M1_ICESTORM MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_ICESTORM)
#define MIDR_APPLE_M1_FIRESTORM MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_FIRESTORM)
#define MIDR_APPLE_M1_ICESTORM_PRO MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_ICESTORM_PRO)
#define MIDR_APPLE_M1_FIRESTORM_PRO MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_FIRESTORM_PRO)
#define MIDR_APPLE_M1_ICESTORM_MAX MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_ICESTORM_MAX)
#define MIDR_APPLE_M1_FIRESTORM_MAX MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_FIRESTORM_MAX)
/* Fujitsu Erratum 010001 affects A64FX 1.0 and 1.1, (v0r0 and v1r0) */
#define MIDR_FUJITSU_ERRATUM_010001 MIDR_FUJITSU_A64FX

8
arch/arm64/include/asm/esr.h
View File

@ -135,7 +135,10 @@
#define ESR_ELx_CV (UL(1) << 24)
#define ESR_ELx_COND_SHIFT (20)
#define ESR_ELx_COND_MASK (UL(0xF) << ESR_ELx_COND_SHIFT)
#define ESR_ELx_WFx_ISS_TI (UL(1) << 0)
#define ESR_ELx_WFx_ISS_RN (UL(0x1F) << 5)
#define ESR_ELx_WFx_ISS_RV (UL(1) << 2)
#define ESR_ELx_WFx_ISS_TI (UL(3) << 0)
#define ESR_ELx_WFx_ISS_WFxT (UL(2) << 0)
#define ESR_ELx_WFx_ISS_WFI (UL(0) << 0)
#define ESR_ELx_WFx_ISS_WFE (UL(1) << 0)
#define ESR_ELx_xVC_IMM_MASK ((UL(1) << 16) - 1)
@ -148,7 +151,8 @@
#define DISR_EL1_ESR_MASK (ESR_ELx_AET | ESR_ELx_EA | ESR_ELx_FSC)
/* ESR value templates for specific events */
#define ESR_ELx_WFx_MASK (ESR_ELx_EC_MASK | ESR_ELx_WFx_ISS_TI)
#define ESR_ELx_WFx_MASK (ESR_ELx_EC_MASK | \
(ESR_ELx_WFx_ISS_TI & ~ESR_ELx_WFx_ISS_WFxT))
#define ESR_ELx_WFx_WFI_VAL ((ESR_ELx_EC_WFx << ESR_ELx_EC_SHIFT) | \
ESR_ELx_WFx_ISS_WFI)

1
arch/arm64/include/asm/hwcap.h
View File

@ -117,6 +117,7 @@
#define KERNEL_HWCAP_SME_B16F32 __khwcap2_feature(SME_B16F32)
#define KERNEL_HWCAP_SME_F32F32 __khwcap2_feature(SME_F32F32)
#define KERNEL_HWCAP_SME_FA64 __khwcap2_feature(SME_FA64)
#define KERNEL_HWCAP_WFXT __khwcap2_feature(WFXT)
/*
* This yields a mask that user programs can use to figure out what

3
arch/arm64/include/asm/kvm_arm.h
View File

@ -80,11 +80,12 @@
* FMO: Override CPSR.F and enable signaling with VF
* SWIO: Turn set/way invalidates into set/way clean+invalidate
* PTW: Take a stage2 fault if a stage1 walk steps in device memory
* TID3: Trap EL1 reads of group 3 ID registers
*/
#define HCR_GUEST_FLAGS (HCR_TSC | HCR_TSW | HCR_TWE | HCR_TWI | HCR_VM | \
HCR_BSU_IS | HCR_FB | HCR_TACR | \
HCR_AMO | HCR_SWIO | HCR_TIDCP | HCR_RW | HCR_TLOR | \
HCR_FMO | HCR_IMO | HCR_PTW )
HCR_FMO | HCR_IMO | HCR_PTW | HCR_TID3 )
#define HCR_VIRT_EXCP_MASK (HCR_VSE | HCR_VI | HCR_VF)
#define HCR_HOST_NVHE_FLAGS (HCR_RW | HCR_API | HCR_APK | HCR_ATA)
#define HCR_HOST_NVHE_PROTECTED_FLAGS (HCR_HOST_NVHE_FLAGS | HCR_TSC)

1
arch/arm64/include/asm/kvm_asm.h
View File

@ -169,6 +169,7 @@ struct kvm_nvhe_init_params {
unsigned long tcr_el2;
unsigned long tpidr_el2;
unsigned long stack_hyp_va;
unsigned long stack_pa;
phys_addr_t pgd_pa;
unsigned long hcr_el2;
unsigned long vttbr;

7
arch/arm64/include/asm/kvm_emulate.h
View File

@ -87,13 +87,6 @@ static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
if (vcpu_el1_is_32bit(vcpu))
vcpu->arch.hcr_el2 &= ~HCR_RW;
else
/*
* TID3: trap feature register accesses that we virtualise.
* For now this is conditional, since no AArch32 feature regs
* are currently virtualised.
*/
vcpu->arch.hcr_el2 |= HCR_TID3;
if (cpus_have_const_cap(ARM64_MISMATCHED_CACHE_TYPE) ||
vcpu_el1_is_32bit(vcpu))

44
arch/arm64/include/asm/kvm_host.h
View File

@ -46,6 +46,7 @@
#define KVM_REQ_RECORD_STEAL KVM_ARCH_REQ(3)
#define KVM_REQ_RELOAD_GICv4 KVM_ARCH_REQ(4)
#define KVM_REQ_RELOAD_PMU KVM_ARCH_REQ(5)
#define KVM_REQ_SUSPEND KVM_ARCH_REQ(6)
#define KVM_DIRTY_LOG_MANUAL_CAPS (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE | \
KVM_DIRTY_LOG_INITIALLY_SET)
@ -101,15 +102,25 @@ struct kvm_s2_mmu {
struct kvm_arch_memory_slot {
};
/**
* struct kvm_smccc_features: Descriptor of the hypercall services exposed to the guests
*
* @std_bmap: Bitmap of standard secure service calls
* @std_hyp_bmap: Bitmap of standard hypervisor service calls
* @vendor_hyp_bmap: Bitmap of vendor specific hypervisor service calls
*/
struct kvm_smccc_features {
unsigned long std_bmap;
unsigned long std_hyp_bmap;
unsigned long vendor_hyp_bmap;
};
struct kvm_arch {
struct kvm_s2_mmu mmu;
/* VTCR_EL2 value for this VM */
u64 vtcr;
/* The maximum number of vCPUs depends on the used GIC model */
int max_vcpus;
/* Interrupt controller */
struct vgic_dist vgic;
@ -136,6 +147,8 @@ struct kvm_arch {
*/
#define KVM_ARCH_FLAG_REG_WIDTH_CONFIGURED 3
#define KVM_ARCH_FLAG_EL1_32BIT 4
/* PSCI SYSTEM_SUSPEND enabled for the guest */
#define KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED 5
unsigned long flags;
@ -150,6 +163,9 @@ struct kvm_arch {
u8 pfr0_csv2;
u8 pfr0_csv3;
/* Hypercall features firmware registers' descriptor */
struct kvm_smccc_features smccc_feat;
};
struct kvm_vcpu_fault_info {
@ -254,14 +270,8 @@ struct kvm_cpu_context {
struct kvm_vcpu *__hyp_running_vcpu;
};
struct kvm_pmu_events {
u32 events_host;
u32 events_guest;
};
struct kvm_host_data {
struct kvm_cpu_context host_ctxt;
struct kvm_pmu_events pmu_events;
};
struct kvm_host_psci_config {
@ -368,8 +378,8 @@ struct kvm_vcpu_arch {
u32 mdscr_el1;
} guest_debug_preserved;
/* vcpu power-off state */
bool power_off;
/* vcpu power state */
struct kvm_mp_state mp_state;
/* Don't run the guest (internal implementation need) */
bool pause;
@ -455,6 +465,7 @@ struct kvm_vcpu_arch {
#define KVM_ARM64_FP_FOREIGN_FPSTATE (1 << 14)
#define KVM_ARM64_ON_UNSUPPORTED_CPU (1 << 15) /* Physical CPU not in supported_cpus */
#define KVM_ARM64_HOST_SME_ENABLED (1 << 16) /* SME enabled for EL0 */
#define KVM_ARM64_WFIT (1 << 17) /* WFIT instruction trapped */
#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
KVM_GUESTDBG_USE_SW_BP | \
@ -687,10 +698,11 @@ int kvm_handle_cp14_64(struct kvm_vcpu *vcpu);
int kvm_handle_cp15_32(struct kvm_vcpu *vcpu);
int kvm_handle_cp15_64(struct kvm_vcpu *vcpu);
int kvm_handle_sys_reg(struct kvm_vcpu *vcpu);
int kvm_handle_cp10_id(struct kvm_vcpu *vcpu);
void kvm_reset_sys_regs(struct kvm_vcpu *vcpu);
void kvm_sys_reg_table_init(void);
int kvm_sys_reg_table_init(void);
/* MMIO helpers */
void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);
@ -799,9 +811,6 @@ void kvm_arch_vcpu_put_debug_state_flags(struct kvm_vcpu *vcpu);
#ifdef CONFIG_KVM
void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr);
void kvm_clr_pmu_events(u32 clr);
void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu);
void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu);
#else
static inline void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr) {}
static inline void kvm_clr_pmu_events(u32 clr) {}
@ -833,8 +842,6 @@ bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu);
#define kvm_has_mte(kvm) \
(system_supports_mte() && \
test_bit(KVM_ARCH_FLAG_MTE_ENABLED, &(kvm)->arch.flags))
#define kvm_vcpu_has_pmu(vcpu) \
(test_bit(KVM_ARM_VCPU_PMU_V3, (vcpu)->arch.features))
int kvm_trng_call(struct kvm_vcpu *vcpu);
#ifdef CONFIG_KVM
@ -845,4 +852,7 @@ void __init kvm_hyp_reserve(void);
static inline void kvm_hyp_reserve(void) { }
#endif
void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu);
bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu);
#endif /* __ARM64_KVM_HOST_H__ */

3
arch/arm64/include/asm/kvm_mmu.h
View File

@ -154,6 +154,9 @@ static __always_inline unsigned long __kern_hyp_va(unsigned long v)
int kvm_share_hyp(void *from, void *to);
void kvm_unshare_hyp(void *from, void *to);
int create_hyp_mappings(void *from, void *to, enum kvm_pgtable_prot prot);
int __create_hyp_mappings(unsigned long start, unsigned long size,
unsigned long phys, enum kvm_pgtable_prot prot);
int hyp_alloc_private_va_range(size_t size, unsigned long *haddr);
int create_hyp_io_mappings(phys_addr_t phys_addr, size_t size,
void __iomem **kaddr,
void __iomem **haddr);

1
arch/arm64/include/uapi/asm/hwcap.h
View File

@ -87,5 +87,6 @@
#define HWCAP2_SME_B16F32 (1 << 28)
#define HWCAP2_SME_F32F32 (1 << 29)
#define HWCAP2_SME_FA64 (1 << 30)
#define HWCAP2_WFXT (1UL << 31)
#endif /* _UAPI__ASM_HWCAP_H */

34
arch/arm64/include/uapi/asm/kvm.h
View File

@ -334,6 +334,40 @@ struct kvm_arm_copy_mte_tags {
#define KVM_ARM64_SVE_VLS_WORDS \
((KVM_ARM64_SVE_VQ_MAX - KVM_ARM64_SVE_VQ_MIN) / 64 + 1)
/* Bitmap feature firmware registers */
#define KVM_REG_ARM_FW_FEAT_BMAP (0x0016 << KVM_REG_ARM_COPROC_SHIFT)
#define KVM_REG_ARM_FW_FEAT_BMAP_REG(r) (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \
KVM_REG_ARM_FW_FEAT_BMAP | \
((r) & 0xffff))
#define KVM_REG_ARM_STD_BMAP KVM_REG_ARM_FW_FEAT_BMAP_REG(0)
enum {
KVM_REG_ARM_STD_BIT_TRNG_V1_0 = 0,
#ifdef __KERNEL__
KVM_REG_ARM_STD_BMAP_BIT_COUNT,
#endif
};
#define KVM_REG_ARM_STD_HYP_BMAP KVM_REG_ARM_FW_FEAT_BMAP_REG(1)
enum {
KVM_REG_ARM_STD_HYP_BIT_PV_TIME = 0,
#ifdef __KERNEL__
KVM_REG_ARM_STD_HYP_BMAP_BIT_COUNT,
#endif
};
#define KVM_REG_ARM_VENDOR_HYP_BMAP KVM_REG_ARM_FW_FEAT_BMAP_REG(2)
enum {
KVM_REG_ARM_VENDOR_HYP_BIT_FUNC_FEAT = 0,
KVM_REG_ARM_VENDOR_HYP_BIT_PTP = 1,
#ifdef __KERNEL__
KVM_REG_ARM_VENDOR_HYP_BMAP_BIT_COUNT,
#endif
};
/* Device Control API: ARM VGIC */
#define KVM_DEV_ARM_VGIC_GRP_ADDR 0
#define KVM_DEV_ARM_VGIC_GRP_DIST_REGS 1

13
arch/arm64/kernel/cpufeature.c
View File

@ -237,6 +237,7 @@ static const struct arm64_ftr_bits ftr_id_aa64isar2[] = {
ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH),
FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_GPA3_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_RPRES_SHIFT, 4, 0),
ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_WFXT_SHIFT, 4, 0),
ARM64_FTR_END,
};
@ -2517,6 +2518,17 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.cpu_enable = fa64_kernel_enable,
},
#endif /* CONFIG_ARM64_SME */
{
.desc = "WFx with timeout",
.capability = ARM64_HAS_WFXT,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
.sys_reg = SYS_ID_AA64ISAR2_EL1,
.sign = FTR_UNSIGNED,
.field_pos = ID_AA64ISAR2_WFXT_SHIFT,
.field_width = 4,
.matches = has_cpuid_feature,
.min_field_value = ID_AA64ISAR2_WFXT_SUPPORTED,
},
{},
};
@ -2650,6 +2662,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
HWCAP_CAP(SYS_ID_AA64MMFR0_EL1, ID_AA64MMFR0_ECV_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ECV),
HWCAP_CAP(SYS_ID_AA64MMFR1_EL1, ID_AA64MMFR1_AFP_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_AFP),
HWCAP_CAP(SYS_ID_AA64ISAR2_EL1, ID_AA64ISAR2_RPRES_SHIFT, 4, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_RPRES),
HWCAP_CAP(SYS_ID_AA64ISAR2_EL1, ID_AA64ISAR2_WFXT_SHIFT, 4, FTR_UNSIGNED, ID_AA64ISAR2_WFXT_SUPPORTED, CAP_HWCAP, KERNEL_HWCAP_WFXT),
#ifdef CONFIG_ARM64_SME
HWCAP_CAP(SYS_ID_AA64PFR1_EL1, ID_AA64PFR1_SME_SHIFT, 4, FTR_UNSIGNED, ID_AA64PFR1_SME, CAP_HWCAP, KERNEL_HWCAP_SME),
HWCAP_CAP(SYS_ID_AA64SMFR0_EL1, ID_AA64SMFR0_FA64_SHIFT, 1, FTR_UNSIGNED, ID_AA64SMFR0_FA64, CAP_HWCAP, KERNEL_HWCAP_SME_FA64),

1
arch/arm64/kernel/cpuinfo.c
View File

@ -106,6 +106,7 @@ static const char *const hwcap_str[] = {
[KERNEL_HWCAP_SME_B16F32] = "smeb16f32",
[KERNEL_HWCAP_SME_F32F32] = "smef32f32",
[KERNEL_HWCAP_SME_FA64] = "smefa64",
[KERNEL_HWCAP_WFXT] = "wfxt",
};
#ifdef CONFIG_COMPAT

4
arch/arm64/kvm/Makefile
View File

@ -13,7 +13,7 @@ obj-$(CONFIG_KVM) += hyp/
kvm-y += arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \
inject_fault.o va_layout.o handle_exit.o \
guest.o debug.o reset.o sys_regs.o \
vgic-sys-reg-v3.o fpsimd.o pmu.o pkvm.o \
vgic-sys-reg-v3.o fpsimd.o pkvm.o \
arch_timer.o trng.o vmid.o \
vgic/vgic.o vgic/vgic-init.o \
vgic/vgic-irqfd.o vgic/vgic-v2.o \
@ -22,7 +22,7 @@ kvm-y += arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \
vgic/vgic-mmio-v3.o vgic/vgic-kvm-device.o \
vgic/vgic-its.o vgic/vgic-debug.o
kvm-$(CONFIG_HW_PERF_EVENTS) += pmu-emul.o
kvm-$(CONFIG_HW_PERF_EVENTS) += pmu-emul.o pmu.o
always-y := hyp_constants.h hyp-constants.s

47
arch/arm64/kvm/arch_timer.c
View File

@ -208,18 +208,16 @@ static irqreturn_t kvm_arch_timer_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
static u64 kvm_timer_compute_delta(struct arch_timer_context *timer_ctx)
static u64 kvm_counter_compute_delta(struct arch_timer_context *timer_ctx,
u64 val)
{
u64 cval, now;
u64 now = kvm_phys_timer_read() - timer_get_offset(timer_ctx);
cval = timer_get_cval(timer_ctx);
now = kvm_phys_timer_read() - timer_get_offset(timer_ctx);
if (now < cval) {
if (now < val) {
u64 ns;
ns = cyclecounter_cyc2ns(timecounter->cc,
cval - now,
val - now,
timecounter->mask,
&timecounter->frac);
return ns;
@ -228,6 +226,11 @@ static u64 kvm_timer_compute_delta(struct arch_timer_context *timer_ctx)
return 0;
}
static u64 kvm_timer_compute_delta(struct arch_timer_context *timer_ctx)
{
return kvm_counter_compute_delta(timer_ctx, timer_get_cval(timer_ctx));
}
static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx)
{
WARN_ON(timer_ctx && timer_ctx->loaded);
@ -236,6 +239,20 @@ static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx)
(ARCH_TIMER_CTRL_IT_MASK | ARCH_TIMER_CTRL_ENABLE)) == ARCH_TIMER_CTRL_ENABLE);
}
static bool vcpu_has_wfit_active(struct kvm_vcpu *vcpu)
{
return (cpus_have_final_cap(ARM64_HAS_WFXT) &&
(vcpu->arch.flags & KVM_ARM64_WFIT));
}
static u64 wfit_delay_ns(struct kvm_vcpu *vcpu)
{
struct arch_timer_context *ctx = vcpu_vtimer(vcpu);
u64 val = vcpu_get_reg(vcpu, kvm_vcpu_sys_get_rt(vcpu));
return kvm_counter_compute_delta(ctx, val);
}
/*
* Returns the earliest expiration time in ns among guest timers.
* Note that it will return 0 if none of timers can fire.
@ -253,6 +270,9 @@ static u64 kvm_timer_earliest_exp(struct kvm_vcpu *vcpu)
min_delta = min(min_delta, kvm_timer_compute_delta(ctx));
}
if (vcpu_has_wfit_active(vcpu))
min_delta = min(min_delta, wfit_delay_ns(vcpu));
/* If none of timers can fire, then return 0 */
if (min_delta == ULLONG_MAX)
return 0;
@ -350,15 +370,9 @@ static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx)
return cval <= now;
}
bool kvm_timer_is_pending(struct kvm_vcpu *vcpu)
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
struct timer_map map;
get_timer_map(vcpu, &map);
return kvm_timer_should_fire(map.direct_vtimer) ||
kvm_timer_should_fire(map.direct_ptimer) ||
kvm_timer_should_fire(map.emul_ptimer);
return vcpu_has_wfit_active(vcpu) && wfit_delay_ns(vcpu) == 0;
}
/*
@ -484,7 +498,8 @@ static void kvm_timer_blocking(struct kvm_vcpu *vcpu)
*/
if (!kvm_timer_irq_can_fire(map.direct_vtimer) &&
!kvm_timer_irq_can_fire(map.direct_ptimer) &&
!kvm_timer_irq_can_fire(map.emul_ptimer))
!kvm_timer_irq_can_fire(map.emul_ptimer) &&
!vcpu_has_wfit_active(vcpu))
return;
/*

164
arch/arm64/kvm/arm.c
View File

@ -97,6 +97,10 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
}
mutex_unlock(&kvm->lock);
break;
case KVM_CAP_ARM_SYSTEM_SUSPEND:
r = 0;
set_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags);
break;
default:
r = -EINVAL;
break;
@ -153,9 +157,10 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm_vgic_early_init(kvm);
/* The maximum number of VCPUs is limited by the host's GIC model */
kvm->arch.max_vcpus = kvm_arm_default_max_vcpus();
kvm->max_vcpus = kvm_arm_default_max_vcpus();
set_default_spectre(kvm);
kvm_arm_init_hypercalls(kvm);
return ret;
out_free_stage2_pgd:
@ -210,6 +215,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_SET_GUEST_DEBUG:
case KVM_CAP_VCPU_ATTRIBUTES:
case KVM_CAP_PTP_KVM:
case KVM_CAP_ARM_SYSTEM_SUSPEND:
r = 1;
break;
case KVM_CAP_SET_GUEST_DEBUG2:
@ -230,7 +236,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_MAX_VCPUS:
case KVM_CAP_MAX_VCPU_ID:
if (kvm)
r = kvm->arch.max_vcpus;
r = kvm->max_vcpus;
else
r = kvm_arm_default_max_vcpus();
break;
@ -306,7 +312,7 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
return -EBUSY;
if (id >= kvm->arch.max_vcpus)
if (id >= kvm->max_vcpus)
return -EINVAL;
return 0;
@ -356,11 +362,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
kvm_arm_vcpu_destroy(vcpu);
}
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
return kvm_timer_is_pending(vcpu);
}
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
{
@ -432,20 +433,34 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
vcpu->cpu = -1;
}
static void vcpu_power_off(struct kvm_vcpu *vcpu)
void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu)
{
vcpu->arch.power_off = true;
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_STOPPED;
kvm_make_request(KVM_REQ_SLEEP, vcpu);
kvm_vcpu_kick(vcpu);
}
bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu)
{
return vcpu->arch.mp_state.mp_state == KVM_MP_STATE_STOPPED;
}
static void kvm_arm_vcpu_suspend(struct kvm_vcpu *vcpu)
{
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_SUSPENDED;
kvm_make_request(KVM_REQ_SUSPEND, vcpu);
kvm_vcpu_kick(vcpu);
}
static bool kvm_arm_vcpu_suspended(struct kvm_vcpu *vcpu)
{
return vcpu->arch.mp_state.mp_state == KVM_MP_STATE_SUSPENDED;
}
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
if (vcpu->arch.power_off)
mp_state->mp_state = KVM_MP_STATE_STOPPED;
else
mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
*mp_state = vcpu->arch.mp_state;
return 0;
}
@ -457,10 +472,13 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
switch (mp_state->mp_state) {
case KVM_MP_STATE_RUNNABLE:
vcpu->arch.power_off = false;
vcpu->arch.mp_state = *mp_state;
break;
case KVM_MP_STATE_STOPPED:
vcpu_power_off(vcpu);
kvm_arm_vcpu_power_off(vcpu);
break;
case KVM_MP_STATE_SUSPENDED:
kvm_arm_vcpu_suspend(vcpu);
break;
default:
ret = -EINVAL;
@ -480,7 +498,7 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
&& !v->arch.power_off && !v->arch.pause);
&& !kvm_arm_vcpu_stopped(v) && !v->arch.pause);
}
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
@ -592,15 +610,15 @@ void kvm_arm_resume_guest(struct kvm *kvm)
}
}
static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
static void kvm_vcpu_sleep(struct kvm_vcpu *vcpu)
{
struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
rcuwait_wait_event(wait,
(!vcpu->arch.power_off) &&(!vcpu->arch.pause),
(!kvm_arm_vcpu_stopped(vcpu)) && (!vcpu->arch.pause),
TASK_INTERRUPTIBLE);
if (vcpu->arch.power_off || vcpu->arch.pause) {
if (kvm_arm_vcpu_stopped(vcpu) || vcpu->arch.pause) {
/* Awaken to handle a signal, request we sleep again later. */
kvm_make_request(KVM_REQ_SLEEP, vcpu);
}
@ -639,6 +657,7 @@ void kvm_vcpu_wfi(struct kvm_vcpu *vcpu)
preempt_enable();
kvm_vcpu_halt(vcpu);
vcpu->arch.flags &= ~KVM_ARM64_WFIT;
kvm_clear_request(KVM_REQ_UNHALT, vcpu);
preempt_disable();
@ -646,11 +665,53 @@ void kvm_vcpu_wfi(struct kvm_vcpu *vcpu)
preempt_enable();
}
static void check_vcpu_requests(struct kvm_vcpu *vcpu)
static int kvm_vcpu_suspend(struct kvm_vcpu *vcpu)
{
if (!kvm_arm_vcpu_suspended(vcpu))
return 1;
kvm_vcpu_wfi(vcpu);
/*
* The suspend state is sticky; we do not leave it until userspace
* explicitly marks the vCPU as runnable. Request that we suspend again
* later.
*/
kvm_make_request(KVM_REQ_SUSPEND, vcpu);
/*
* Check to make sure the vCPU is actually runnable. If so, exit to
* userspace informing it of the wakeup condition.
*/
if (kvm_arch_vcpu_runnable(vcpu)) {
memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
vcpu->run->system_event.type = KVM_SYSTEM_EVENT_WAKEUP;
vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
return 0;
}
/*
* Otherwise, we were unblocked to process a different event, such as a
* pending signal. Return 1 and allow kvm_arch_vcpu_ioctl_run() to
* process the event.
*/
return 1;
}
/**
* check_vcpu_requests - check and handle pending vCPU requests
* @vcpu: the VCPU pointer
*
* Return: 1 if we should enter the guest
* 0 if we should exit to userspace
* < 0 if we should exit to userspace, where the return value indicates
* an error
*/
static int check_vcpu_requests(struct kvm_vcpu *vcpu)
{
if (kvm_request_pending(vcpu)) {
if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
vcpu_req_sleep(vcpu);
kvm_vcpu_sleep(vcpu);
if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
kvm_reset_vcpu(vcpu);
@ -675,7 +736,12 @@ static void check_vcpu_requests(struct kvm_vcpu *vcpu)
if (kvm_check_request(KVM_REQ_RELOAD_PMU, vcpu))
kvm_pmu_handle_pmcr(vcpu,
__vcpu_sys_reg(vcpu, PMCR_EL0));
if (kvm_check_request(KVM_REQ_SUSPEND, vcpu))
return kvm_vcpu_suspend(vcpu);
}
return 1;
}
static bool vcpu_mode_is_bad_32bit(struct kvm_vcpu *vcpu)
@ -792,7 +858,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
if (!ret)
ret = 1;
check_vcpu_requests(vcpu);
if (ret > 0)
ret = check_vcpu_requests(vcpu);
/*
* Preparing the interrupts to be injected also
@ -816,6 +883,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
kvm_vgic_flush_hwstate(vcpu);
kvm_pmu_update_vcpu_events(vcpu);
/*
* Ensure we set mode to IN_GUEST_MODE after we disable
* interrupts and before the final VCPU requests check.
@ -1125,9 +1194,9 @@ static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
* Handle the "start in power-off" case.
*/
if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
vcpu_power_off(vcpu);
kvm_arm_vcpu_power_off(vcpu);
else
vcpu->arch.power_off = false;
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_RUNNABLE;
return 0;
}
@ -1485,7 +1554,6 @@ static void cpu_prepare_hyp_mode(int cpu)
tcr |= (idmap_t0sz & GENMASK(TCR_TxSZ_WIDTH - 1, 0)) << TCR_T0SZ_OFFSET;
params->tcr_el2 = tcr;
params->stack_hyp_va = kern_hyp_va(per_cpu(kvm_arm_hyp_stack_page, cpu) + PAGE_SIZE);
params->pgd_pa = kvm_mmu_get_httbr();
if (is_protected_kvm_enabled())
params->hcr_el2 = HCR_HOST_NVHE_PROTECTED_FLAGS;
@ -1763,8 +1831,6 @@ static int init_subsystems(void)
kvm_register_perf_callbacks(NULL);
kvm_sys_reg_table_init();
out:
if (err || !is_protected_kvm_enabled())
on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
@ -1935,14 +2001,46 @@ static int init_hyp_mode(void)
* Map the Hyp stack pages
*/
for_each_possible_cpu(cpu) {
struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
PAGE_HYP);
unsigned long hyp_addr;
/*
* Allocate a contiguous HYP private VA range for the stack
* and guard page. The allocation is also aligned based on
* the order of its size.
*/
err = hyp_alloc_private_va_range(PAGE_SIZE * 2, &hyp_addr);
if (err) {
kvm_err("Cannot allocate hyp stack guard page\n");
goto out_err;
}
/*
* Since the stack grows downwards, map the stack to the page
* at the higher address and leave the lower guard page
* unbacked.
*
* Any valid stack address now has the PAGE_SHIFT bit as 1
* and addresses corresponding to the guard page have the
* PAGE_SHIFT bit as 0 - this is used for overflow detection.
*/
err = __create_hyp_mappings(hyp_addr + PAGE_SIZE, PAGE_SIZE,
__pa(stack_page), PAGE_HYP);
if (err) {
kvm_err("Cannot map hyp stack\n");
goto out_err;
}
/*
* Save the stack PA in nvhe_init_params. This will be needed
* to recreate the stack mapping in protected nVHE mode.
* __hyp_pa() won't do the right thing there, since the stack
* has been mapped in the flexible private VA space.
*/
params->stack_pa = __pa(stack_page);
params->stack_hyp_va = hyp_addr + (2 * PAGE_SIZE);
}
for_each_possible_cpu(cpu) {
@ -2091,6 +2189,12 @@ int kvm_arch_init(void *opaque)
return -ENODEV;
}
err = kvm_sys_reg_table_init();
if (err) {
kvm_info("Error initializing system register tables");
return err;
}
in_hyp_mode = is_kernel_in_hyp_mode();
if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) ||

10
arch/arm64/kvm/guest.c
View File

@ -18,7 +18,7 @@
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <kvm/arm_psci.h>
#include <kvm/arm_hypercalls.h>
#include <asm/cputype.h>
#include <linux/uaccess.h>
#include <asm/fpsimd.h>
@ -756,7 +756,9 @@ int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
switch (reg->id & KVM_REG_ARM_COPROC_MASK) {
case KVM_REG_ARM_CORE: return get_core_reg(vcpu, reg);
case KVM_REG_ARM_FW: return kvm_arm_get_fw_reg(vcpu, reg);
case KVM_REG_ARM_FW:
case KVM_REG_ARM_FW_FEAT_BMAP:
return kvm_arm_get_fw_reg(vcpu, reg);
case KVM_REG_ARM64_SVE: return get_sve_reg(vcpu, reg);
}
@ -774,7 +776,9 @@ int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
switch (reg->id & KVM_REG_ARM_COPROC_MASK) {
case KVM_REG_ARM_CORE: return set_core_reg(vcpu, reg);
case KVM_REG_ARM_FW: return kvm_arm_set_fw_reg(vcpu, reg);
case KVM_REG_ARM_FW:
case KVM_REG_ARM_FW_FEAT_BMAP:
return kvm_arm_set_fw_reg(vcpu, reg);
case KVM_REG_ARM64_SVE: return set_sve_reg(vcpu, reg);
}

49
arch/arm64/kvm/handle_exit.c
View File

@ -80,24 +80,51 @@ static int handle_no_fpsimd(struct kvm_vcpu *vcpu)
*
* @vcpu: the vcpu pointer
*
* WFE: Yield the CPU and come back to this vcpu when the scheduler
* WFE[T]: Yield the CPU and come back to this vcpu when the scheduler
* decides to.
* WFI: Simply call kvm_vcpu_halt(), which will halt execution of
* world-switches and schedule other host processes until there is an
* incoming IRQ or FIQ to the VM.
* WFIT: Same as WFI, with a timed wakeup implemented as a background timer
*
* WF{I,E}T can immediately return if the deadline has already expired.
*/
static int kvm_handle_wfx(struct kvm_vcpu *vcpu)
{
if (kvm_vcpu_get_esr(vcpu) & ESR_ELx_WFx_ISS_WFE) {
u64 esr = kvm_vcpu_get_esr(vcpu);
if (esr & ESR_ELx_WFx_ISS_WFE) {
trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true);
vcpu->stat.wfe_exit_stat++;
kvm_vcpu_on_spin(vcpu, vcpu_mode_priv(vcpu));
} else {
trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false);
vcpu->stat.wfi_exit_stat++;
kvm_vcpu_wfi(vcpu);
}
if (esr & ESR_ELx_WFx_ISS_WFxT) {
if (esr & ESR_ELx_WFx_ISS_RV) {
u64 val, now;
now = kvm_arm_timer_get_reg(vcpu, KVM_REG_ARM_TIMER_CNT);
val = vcpu_get_reg(vcpu, kvm_vcpu_sys_get_rt(vcpu));
if (now >= val)
goto out;
} else {
/* Treat WFxT as WFx if RN is invalid */
esr &= ~ESR_ELx_WFx_ISS_WFxT;
}
}
if (esr & ESR_ELx_WFx_ISS_WFE) {
kvm_vcpu_on_spin(vcpu, vcpu_mode_priv(vcpu));
} else {
if (esr & ESR_ELx_WFx_ISS_WFxT)
vcpu->arch.flags |= KVM_ARM64_WFIT;
kvm_vcpu_wfi(vcpu);
}
out:
kvm_incr_pc(vcpu);
return 1;
@ -169,6 +196,7 @@ static exit_handle_fn arm_exit_handlers[] = {
[ESR_ELx_EC_CP15_64] = kvm_handle_cp15_64,
[ESR_ELx_EC_CP14_MR] = kvm_handle_cp14_32,
[ESR_ELx_EC_CP14_LS] = kvm_handle_cp14_load_store,
[ESR_ELx_EC_CP10_ID] = kvm_handle_cp10_id,
[ESR_ELx_EC_CP14_64] = kvm_handle_cp14_64,
[ESR_ELx_EC_HVC32] = handle_hvc,
[ESR_ELx_EC_SMC32] = handle_smc,
@ -297,13 +325,8 @@ void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr,
u64 elr_in_kimg = __phys_to_kimg(elr_phys);
u64 hyp_offset = elr_in_kimg - kaslr_offset() - elr_virt;
u64 mode = spsr & PSR_MODE_MASK;
u64 panic_addr = elr_virt + hyp_offset;
/*
* The nVHE hyp symbols are not included by kallsyms to avoid issues
* with aliasing. That means that the symbols cannot be printed with the
* "%pS" format specifier, so fall back to the vmlinux address if
* there's no better option.
*/
if (mode != PSR_MODE_EL2t && mode != PSR_MODE_EL2h) {
kvm_err("Invalid host exception to nVHE hyp!\n");
} else if (ESR_ELx_EC(esr) == ESR_ELx_EC_BRK64 &&
@ -323,9 +346,11 @@ void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr,
if (file)
kvm_err("nVHE hyp BUG at: %s:%u!\n", file, line);
else
kvm_err("nVHE hyp BUG at: %016llx!\n", elr_virt + hyp_offset);
kvm_err("nVHE hyp BUG at: [<%016llx>] %pB!\n", panic_addr,
(void *)panic_addr);
} else {
kvm_err("nVHE hyp panic at: %016llx!\n", elr_virt + hyp_offset);
kvm_err("nVHE hyp panic at: [<%016llx>] %pB!\n", panic_addr,
(void *)panic_addr);
}
/*

6
arch/arm64/kvm/hyp/include/nvhe/mm.h
View File

@ -19,8 +19,10 @@ int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back);
int pkvm_cpu_set_vector(enum arm64_hyp_spectre_vector slot);
int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot);
int pkvm_create_mappings_locked(void *from, void *to, enum kvm_pgtable_prot prot);
unsigned long __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
enum kvm_pgtable_prot prot);
int __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
enum kvm_pgtable_prot prot,
unsigned long *haddr);
int pkvm_alloc_private_va_range(size_t size, unsigned long *haddr);
static inline void hyp_vmemmap_range(phys_addr_t phys, unsigned long size,
unsigned long *start, unsigned long *end)

32
arch/arm64/kvm/hyp/nvhe/host.S
View File

@ -80,7 +80,7 @@ SYM_FUNC_START(__hyp_do_panic)
mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
PSR_MODE_EL1h)
msr spsr_el2, lr
ldr lr, =nvhe_hyp_panic_handler
adr_l lr, nvhe_hyp_panic_handler
hyp_kimg_va lr, x6
msr elr_el2, lr
@ -125,13 +125,11 @@ alternative_else_nop_endif
add sp, sp, #16
/*
* Compute the idmap address of __kvm_handle_stub_hvc and
* jump there. Since we use kimage_voffset, do not use the
* HYP VA for __kvm_handle_stub_hvc, but the kernel VA instead
* (by loading it from the constant pool).
* jump there.
*
* Preserve x0-x4, which may contain stub parameters.
*/
ldr x5, =__kvm_handle_stub_hvc
adr_l x5, __kvm_handle_stub_hvc
hyp_pa x5, x6
br x5
SYM_FUNC_END(__host_hvc)
@ -153,6 +151,18 @@ SYM_FUNC_END(__host_hvc)
.macro invalid_host_el2_vect
.align 7
/*
* Test whether the SP has overflowed, without corrupting a GPR.
* nVHE hypervisor stacks are aligned so that the PAGE_SHIFT bit
* of SP should always be 1.
*/
add sp, sp, x0 // sp' = sp + x0
sub x0, sp, x0 // x0' = sp' - x0 = (sp + x0) - x0 = sp
tbz x0, #PAGE_SHIFT, .L__hyp_sp_overflow\@
sub x0, sp, x0 // x0'' = sp' - x0' = (sp + x0) - sp = x0
sub sp, sp, x0 // sp'' = sp' - x0 = (sp + x0) - x0 = sp
/* If a guest is loaded, panic out of it. */
stp x0, x1, [sp, #-16]!
get_loaded_vcpu x0, x1
@ -165,6 +175,18 @@ SYM_FUNC_END(__host_hvc)
* been partially clobbered by __host_enter.
*/
b hyp_panic
.L__hyp_sp_overflow\@:
/*
* Reset SP to the top of the stack, to allow handling the hyp_panic.
* This corrupts the stack but is ok, since we won't be attempting
* any unwinding here.
*/
ldr_this_cpu x0, kvm_init_params + NVHE_INIT_STACK_HYP_VA, x1
mov sp, x0
b hyp_panic_bad_stack
ASM_BUG()
.endm
.macro invalid_host_el1_vect

18
arch/arm64/kvm/hyp/nvhe/hyp-main.c
View File

@ -160,7 +160,23 @@ static void handle___pkvm_create_private_mapping(struct kvm_cpu_context *host_ct
DECLARE_REG(size_t, size, host_ctxt, 2);
DECLARE_REG(enum kvm_pgtable_prot, prot, host_ctxt, 3);
cpu_reg(host_ctxt, 1) = __pkvm_create_private_mapping(phys, size, prot);
/*
* __pkvm_create_private_mapping() populates a pointer with the
* hypervisor start address of the allocation.
*
* However, handle___pkvm_create_private_mapping() hypercall crosses the
* EL1/EL2 boundary so the pointer would not be valid in this context.
*
* Instead pass the allocation address as the return value (or return
* ERR_PTR() on failure).
*/
unsigned long haddr;
int err = __pkvm_create_private_mapping(phys, size, prot, &haddr);
if (err)
haddr = (unsigned long)ERR_PTR(err);
cpu_reg(host_ctxt, 1) = haddr;
}
static void handle___pkvm_prot_finalize(struct kvm_cpu_context *host_ctxt)

84
arch/arm64/kvm/hyp/nvhe/mm.c
View File

@ -37,36 +37,60 @@ static int __pkvm_create_mappings(unsigned long start, unsigned long size,
return err;
}
unsigned long __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
enum kvm_pgtable_prot prot)
/**
* pkvm_alloc_private_va_range - Allocates a private VA range.
* @size: The size of the VA range to reserve.
* @haddr: The hypervisor virtual start address of the allocation.
*
* The private virtual address (VA) range is allocated above __io_map_base
* and aligned based on the order of @size.
*
* Return: 0 on success or negative error code on failure.
*/
int pkvm_alloc_private_va_range(size_t size, unsigned long *haddr)
{
unsigned long base, addr;
int ret = 0;
hyp_spin_lock(&pkvm_pgd_lock);
/* Align the allocation based on the order of its size */
addr = ALIGN(__io_map_base, PAGE_SIZE << get_order(size));
/* The allocated size is always a multiple of PAGE_SIZE */
base = addr + PAGE_ALIGN(size);
/* Are we overflowing on the vmemmap ? */
if (!addr || base > __hyp_vmemmap)
ret = -ENOMEM;
else {
__io_map_base = base;
*haddr = addr;
}
hyp_spin_unlock(&pkvm_pgd_lock);
return ret;
}
int __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
enum kvm_pgtable_prot prot,
unsigned long *haddr)
{
unsigned long addr;
int err;
hyp_spin_lock(&pkvm_pgd_lock);
size = PAGE_ALIGN(size + offset_in_page(phys));
addr = __io_map_base;
__io_map_base += size;
err = pkvm_alloc_private_va_range(size, &addr);
if (err)
return err;
/* Are we overflowing on the vmemmap ? */
if (__io_map_base > __hyp_vmemmap) {
__io_map_base -= size;
addr = (unsigned long)ERR_PTR(-ENOMEM);
goto out;
}
err = __pkvm_create_mappings(addr, size, phys, prot);
if (err)
return err;
err = kvm_pgtable_hyp_map(&pkvm_pgtable, addr, size, phys, prot);
if (err) {
addr = (unsigned long)ERR_PTR(err);
goto out;
}
addr = addr + offset_in_page(phys);
out:
hyp_spin_unlock(&pkvm_pgd_lock);
return addr;
*haddr = addr + offset_in_page(phys);
return err;
}
int pkvm_create_mappings_locked(void *from, void *to, enum kvm_pgtable_prot prot)
@ -146,7 +170,8 @@ int pkvm_cpu_set_vector(enum arm64_hyp_spectre_vector slot)
int hyp_map_vectors(void)
{
phys_addr_t phys;
void *bp_base;
unsigned long bp_base;
int ret;
if (!kvm_system_needs_idmapped_vectors()) {
__hyp_bp_vect_base = __bp_harden_hyp_vecs;
@ -154,13 +179,12 @@ int hyp_map_vectors(void)
}
phys = __hyp_pa(__bp_harden_hyp_vecs);
bp_base = (void *)__pkvm_create_private_mapping(phys,
__BP_HARDEN_HYP_VECS_SZ,
PAGE_HYP_EXEC);
if (IS_ERR_OR_NULL(bp_base))
return PTR_ERR(bp_base);
ret = __pkvm_create_private_mapping(phys, __BP_HARDEN_HYP_VECS_SZ,
PAGE_HYP_EXEC, &bp_base);
if (ret)
return ret;
__hyp_bp_vect_base = bp_base;
__hyp_bp_vect_base = (void *)bp_base;
return 0;
}

31
arch/arm64/kvm/hyp/nvhe/setup.c
View File

@ -99,17 +99,42 @@ static int recreate_hyp_mappings(phys_addr_t phys, unsigned long size,
return ret;
for (i = 0; i < hyp_nr_cpus; i++) {
struct kvm_nvhe_init_params *params = per_cpu_ptr(&kvm_init_params, i);
unsigned long hyp_addr;
start = (void *)kern_hyp_va(per_cpu_base[i]);
end = start + PAGE_ALIGN(hyp_percpu_size);
ret = pkvm_create_mappings(start, end, PAGE_HYP);
if (ret)
return ret;
end = (void *)per_cpu_ptr(&kvm_init_params, i)->stack_hyp_va;
start = end - PAGE_SIZE;
ret = pkvm_create_mappings(start, end, PAGE_HYP);
/*
* Allocate a contiguous HYP private VA range for the stack
* and guard page. The allocation is also aligned based on
* the order of its size.
*/
ret = pkvm_alloc_private_va_range(PAGE_SIZE * 2, &hyp_addr);
if (ret)
return ret;
/*
* Since the stack grows downwards, map the stack to the page
* at the higher address and leave the lower guard page
* unbacked.
*
* Any valid stack address now has the PAGE_SHIFT bit as 1
* and addresses corresponding to the guard page have the
* PAGE_SHIFT bit as 0 - this is used for overflow detection.
*/
hyp_spin_lock(&pkvm_pgd_lock);
ret = kvm_pgtable_hyp_map(&pkvm_pgtable, hyp_addr + PAGE_SIZE,
PAGE_SIZE, params->stack_pa, PAGE_HYP);
hyp_spin_unlock(&pkvm_pgd_lock);
if (ret)
return ret;
/* Update stack_hyp_va to end of the stack's private VA range */
params->stack_hyp_va = hyp_addr + (2 * PAGE_SIZE);
}
/*

57
arch/arm64/kvm/hyp/nvhe/switch.c
View File

@ -150,16 +150,13 @@ static void __hyp_vgic_restore_state(struct kvm_vcpu *vcpu)
}
}
/**
/*
* Disable host events, enable guest events
*/
static bool __pmu_switch_to_guest(struct kvm_cpu_context *host_ctxt)
#ifdef CONFIG_HW_PERF_EVENTS
static bool __pmu_switch_to_guest(struct kvm_vcpu *vcpu)
{
struct kvm_host_data *host;
struct kvm_pmu_events *pmu;
host = container_of(host_ctxt, struct kvm_host_data, host_ctxt);
pmu = &host->pmu_events;
struct kvm_pmu_events *pmu = &vcpu->arch.pmu.events;
if (pmu->events_host)
write_sysreg(pmu->events_host, pmcntenclr_el0);
@ -170,16 +167,12 @@ static bool __pmu_switch_to_guest(struct kvm_cpu_context *host_ctxt)
return (pmu->events_host || pmu->events_guest);
}
/**
/*
* Disable guest events, enable host events
*/
static void __pmu_switch_to_host(struct kvm_cpu_context *host_ctxt)
static void __pmu_switch_to_host(struct kvm_vcpu *vcpu)
{
struct kvm_host_data *host;
struct kvm_pmu_events *pmu;
host = container_of(host_ctxt, struct kvm_host_data, host_ctxt);
pmu = &host->pmu_events;
struct kvm_pmu_events *pmu = &vcpu->arch.pmu.events;
if (pmu->events_guest)
write_sysreg(pmu->events_guest, pmcntenclr_el0);
@ -187,8 +180,12 @@ static void __pmu_switch_to_host(struct kvm_cpu_context *host_ctxt)
if (pmu->events_host)
write_sysreg(pmu->events_host, pmcntenset_el0);
}
#else
#define __pmu_switch_to_guest(v) ({ false; })
#define __pmu_switch_to_host(v) do {} while (0)
#endif
/**
/*
* Handler for protected VM MSR, MRS or System instruction execution in AArch64.
*
* Returns true if the hypervisor has handled the exit, and control should go
@ -205,23 +202,6 @@ static bool kvm_handle_pvm_sys64(struct kvm_vcpu *vcpu, u64 *exit_code)
kvm_handle_pvm_sysreg(vcpu, exit_code));
}
/**
* Handler for protected floating-point and Advanced SIMD accesses.
*
* Returns true if the hypervisor has handled the exit, and control should go
* back to the guest, or false if it hasn't.
*/
static bool kvm_handle_pvm_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code)
{
/* Linux guests assume support for floating-point and Advanced SIMD. */
BUILD_BUG_ON(!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_FP),
PVM_ID_AA64PFR0_ALLOW));
BUILD_BUG_ON(!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_ASIMD),
PVM_ID_AA64PFR0_ALLOW));
return kvm_hyp_handle_fpsimd(vcpu, exit_code);
}
static const exit_handler_fn hyp_exit_handlers[] = {
[0 ... ESR_ELx_EC_MAX] = NULL,
[ESR_ELx_EC_CP15_32] = kvm_hyp_handle_cp15_32,
@ -237,7 +217,7 @@ static const exit_handler_fn pvm_exit_handlers[] = {
[0 ... ESR_ELx_EC_MAX] = NULL,
[ESR_ELx_EC_SYS64] = kvm_handle_pvm_sys64,
[ESR_ELx_EC_SVE] = kvm_handle_pvm_restricted,
[ESR_ELx_EC_FP_ASIMD] = kvm_handle_pvm_fpsimd,
[ESR_ELx_EC_FP_ASIMD] = kvm_hyp_handle_fpsimd,
[ESR_ELx_EC_IABT_LOW] = kvm_hyp_handle_iabt_low,
[ESR_ELx_EC_DABT_LOW] = kvm_hyp_handle_dabt_low,
[ESR_ELx_EC_PAC] = kvm_hyp_handle_ptrauth,
@ -304,7 +284,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
host_ctxt->__hyp_running_vcpu = vcpu;
guest_ctxt = &vcpu->arch.ctxt;
pmu_switch_needed = __pmu_switch_to_guest(host_ctxt);
pmu_switch_needed = __pmu_switch_to_guest(vcpu);
__sysreg_save_state_nvhe(host_ctxt);
/*
@ -366,7 +346,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
__debug_restore_host_buffers_nvhe(vcpu);
if (pmu_switch_needed)
__pmu_switch_to_host(host_ctxt);
__pmu_switch_to_host(vcpu);
/* Returning to host will clear PSR.I, remask PMR if needed */
if (system_uses_irq_prio_masking())
@ -377,7 +357,7 @@ int __kvm_vcpu_run(struct kvm_vcpu *vcpu)
return exit_code;
}
void __noreturn hyp_panic(void)
asmlinkage void __noreturn hyp_panic(void)
{
u64 spsr = read_sysreg_el2(SYS_SPSR);
u64 elr = read_sysreg_el2(SYS_ELR);
@ -399,6 +379,11 @@ void __noreturn hyp_panic(void)
unreachable();
}
asmlinkage void __noreturn hyp_panic_bad_stack(void)
{
hyp_panic();
}
asmlinkage void kvm_unexpected_el2_exception(void)
{
return __kvm_unexpected_el2_exception();

3
arch/arm64/kvm/hyp/nvhe/sys_regs.c
View File

@ -90,9 +90,6 @@ static u64 get_pvm_id_aa64pfr0(const struct kvm_vcpu *vcpu)
u64 set_mask = 0;
u64 allow_mask = PVM_ID_AA64PFR0_ALLOW;
if (!vcpu_has_sve(vcpu))
allow_mask &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_SVE);
set_mask |= get_restricted_features_unsigned(id_aa64pfr0_el1_sys_val,
PVM_ID_AA64PFR0_RESTRICT_UNSIGNED);

327
arch/arm64/kvm/hypercalls.c
View File

@ -9,6 +9,13 @@
#include <kvm/arm_hypercalls.h>
#include <kvm/arm_psci.h>
#define KVM_ARM_SMCCC_STD_FEATURES \
GENMASK(KVM_REG_ARM_STD_BMAP_BIT_COUNT - 1, 0)
#define KVM_ARM_SMCCC_STD_HYP_FEATURES \
GENMASK(KVM_REG_ARM_STD_HYP_BMAP_BIT_COUNT - 1, 0)
#define KVM_ARM_SMCCC_VENDOR_HYP_FEATURES \
GENMASK(KVM_REG_ARM_VENDOR_HYP_BMAP_BIT_COUNT - 1, 0)
static void kvm_ptp_get_time(struct kvm_vcpu *vcpu, u64 *val)
{
struct system_time_snapshot systime_snapshot;
@ -58,13 +65,73 @@ static void kvm_ptp_get_time(struct kvm_vcpu *vcpu, u64 *val)
val[3] = lower_32_bits(cycles);
}
static bool kvm_hvc_call_default_allowed(u32 func_id)
{
switch (func_id) {
/*
* List of function-ids that are not gated with the bitmapped
* feature firmware registers, and are to be allowed for
* servicing the call by default.
*/
case ARM_SMCCC_VERSION_FUNC_ID:
case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
return true;
default:
/* PSCI 0.2 and up is in the 0:0x1f range */
if (ARM_SMCCC_OWNER_NUM(func_id) == ARM_SMCCC_OWNER_STANDARD &&
ARM_SMCCC_FUNC_NUM(func_id) <= 0x1f)
return true;
/*
* KVM's PSCI 0.1 doesn't comply with SMCCC, and has
* its own function-id base and range
*/
if (func_id >= KVM_PSCI_FN(0) && func_id <= KVM_PSCI_FN(3))
return true;
return false;
}
}
static bool kvm_hvc_call_allowed(struct kvm_vcpu *vcpu, u32 func_id)
{
struct kvm_smccc_features *smccc_feat = &vcpu->kvm->arch.smccc_feat;
switch (func_id) {
case ARM_SMCCC_TRNG_VERSION:
case ARM_SMCCC_TRNG_FEATURES:
case ARM_SMCCC_TRNG_GET_UUID:
case ARM_SMCCC_TRNG_RND32:
case ARM_SMCCC_TRNG_RND64:
return test_bit(KVM_REG_ARM_STD_BIT_TRNG_V1_0,
&smccc_feat->std_bmap);
case ARM_SMCCC_HV_PV_TIME_FEATURES:
case ARM_SMCCC_HV_PV_TIME_ST:
return test_bit(KVM_REG_ARM_STD_HYP_BIT_PV_TIME,
&smccc_feat->std_hyp_bmap);
case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
case ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID:
return test_bit(KVM_REG_ARM_VENDOR_HYP_BIT_FUNC_FEAT,
&smccc_feat->vendor_hyp_bmap);
case ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID:
return test_bit(KVM_REG_ARM_VENDOR_HYP_BIT_PTP,
&smccc_feat->vendor_hyp_bmap);
default:
return kvm_hvc_call_default_allowed(func_id);
}
}
int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
{
struct kvm_smccc_features *smccc_feat = &vcpu->kvm->arch.smccc_feat;
u32 func_id = smccc_get_function(vcpu);
u64 val[4] = {SMCCC_RET_NOT_SUPPORTED};
u32 feature;
gpa_t gpa;
if (!kvm_hvc_call_allowed(vcpu, func_id))
goto out;
switch (func_id) {
case ARM_SMCCC_VERSION_FUNC_ID:
val[0] = ARM_SMCCC_VERSION_1_1;
@ -120,7 +187,9 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
}
break;
case ARM_SMCCC_HV_PV_TIME_FEATURES:
val[0] = SMCCC_RET_SUCCESS;
if (test_bit(KVM_REG_ARM_STD_HYP_BIT_PV_TIME,
&smccc_feat->std_hyp_bmap))
val[0] = SMCCC_RET_SUCCESS;
break;
}
break;
@ -139,8 +208,7 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
val[3] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3;
break;
case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
val[0] = BIT(ARM_SMCCC_KVM_FUNC_FEATURES);
val[0] |= BIT(ARM_SMCCC_KVM_FUNC_PTP);
val[0] = smccc_feat->vendor_hyp_bmap;
break;
case ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID:
kvm_ptp_get_time(vcpu, val);
@ -155,6 +223,259 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
return kvm_psci_call(vcpu);
}
out:
smccc_set_retval(vcpu, val[0], val[1], val[2], val[3]);
return 1;
}
static const u64 kvm_arm_fw_reg_ids[] = {
KVM_REG_ARM_PSCI_VERSION,
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1,
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2,
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3,
KVM_REG_ARM_STD_BMAP,
KVM_REG_ARM_STD_HYP_BMAP,
KVM_REG_ARM_VENDOR_HYP_BMAP,
};
void kvm_arm_init_hypercalls(struct kvm *kvm)
{
struct kvm_smccc_features *smccc_feat = &kvm->arch.smccc_feat;
smccc_feat->std_bmap = KVM_ARM_SMCCC_STD_FEATURES;
smccc_feat->std_hyp_bmap = KVM_ARM_SMCCC_STD_HYP_FEATURES;
smccc_feat->vendor_hyp_bmap = KVM_ARM_SMCCC_VENDOR_HYP_FEATURES;
}
int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu)
{
return ARRAY_SIZE(kvm_arm_fw_reg_ids);
}
int kvm_arm_copy_fw_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
{
int i;
for (i = 0; i < ARRAY_SIZE(kvm_arm_fw_reg_ids); i++) {
if (put_user(kvm_arm_fw_reg_ids[i], uindices++))
return -EFAULT;
}
return 0;
}
#define KVM_REG_FEATURE_LEVEL_MASK GENMASK(3, 0)
/*
* Convert the workaround level into an easy-to-compare number, where higher
* values mean better protection.
*/
static int get_kernel_wa_level(u64 regid)
{
switch (regid) {
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
switch (arm64_get_spectre_v2_state()) {
case SPECTRE_VULNERABLE:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL;
case SPECTRE_MITIGATED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL;
case SPECTRE_UNAFFECTED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED;
}
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
switch (arm64_get_spectre_v4_state()) {
case SPECTRE_MITIGATED:
/*
* As for the hypercall discovery, we pretend we
* don't have any FW mitigation if SSBS is there at
* all times.
*/
if (cpus_have_final_cap(ARM64_SSBS))
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
fallthrough;
case SPECTRE_UNAFFECTED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED;
case SPECTRE_VULNERABLE:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
}
break;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
switch (arm64_get_spectre_bhb_state()) {
case SPECTRE_VULNERABLE:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_NOT_AVAIL;
case SPECTRE_MITIGATED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_AVAIL;
case SPECTRE_UNAFFECTED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_NOT_REQUIRED;
}
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_NOT_AVAIL;
}
return -EINVAL;
}
int kvm_arm_get_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
struct kvm_smccc_features *smccc_feat = &vcpu->kvm->arch.smccc_feat;
void __user *uaddr = (void __user *)(long)reg->addr;
u64 val;
switch (reg->id) {
case KVM_REG_ARM_PSCI_VERSION:
val = kvm_psci_version(vcpu);
break;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
val = get_kernel_wa_level(reg->id) & KVM_REG_FEATURE_LEVEL_MASK;
break;
case KVM_REG_ARM_STD_BMAP:
val = READ_ONCE(smccc_feat->std_bmap);
break;
case KVM_REG_ARM_STD_HYP_BMAP:
val = READ_ONCE(smccc_feat->std_hyp_bmap);
break;
case KVM_REG_ARM_VENDOR_HYP_BMAP:
val = READ_ONCE(smccc_feat->vendor_hyp_bmap);
break;
default:
return -ENOENT;
}
if (copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
static int kvm_arm_set_fw_reg_bmap(struct kvm_vcpu *vcpu, u64 reg_id, u64 val)
{
int ret = 0;
struct kvm *kvm = vcpu->kvm;
struct kvm_smccc_features *smccc_feat = &kvm->arch.smccc_feat;
unsigned long *fw_reg_bmap, fw_reg_features;
switch (reg_id) {
case KVM_REG_ARM_STD_BMAP:
fw_reg_bmap = &smccc_feat->std_bmap;
fw_reg_features = KVM_ARM_SMCCC_STD_FEATURES;
break;
case KVM_REG_ARM_STD_HYP_BMAP:
fw_reg_bmap = &smccc_feat->std_hyp_bmap;
fw_reg_features = KVM_ARM_SMCCC_STD_HYP_FEATURES;
break;
case KVM_REG_ARM_VENDOR_HYP_BMAP:
fw_reg_bmap = &smccc_feat->vendor_hyp_bmap;
fw_reg_features = KVM_ARM_SMCCC_VENDOR_HYP_FEATURES;
break;
default:
return -ENOENT;
}
/* Check for unsupported bit */
if (val & ~fw_reg_features)
return -EINVAL;
mutex_lock(&kvm->lock);
if (test_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &kvm->arch.flags) &&
val != *fw_reg_bmap) {
ret = -EBUSY;
goto out;
}
WRITE_ONCE(*fw_reg_bmap, val);
out:
mutex_unlock(&kvm->lock);
return ret;
}
int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
void __user *uaddr = (void __user *)(long)reg->addr;
u64 val;
int wa_level;
if (copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
switch (reg->id) {
case KVM_REG_ARM_PSCI_VERSION:
{
bool wants_02;
wants_02 = test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features);
switch (val) {
case KVM_ARM_PSCI_0_1:
if (wants_02)
return -EINVAL;
vcpu->kvm->arch.psci_version = val;
return 0;
case KVM_ARM_PSCI_0_2:
case KVM_ARM_PSCI_1_0:
case KVM_ARM_PSCI_1_1:
if (!wants_02)
return -EINVAL;
vcpu->kvm->arch.psci_version = val;
return 0;
}
break;
}
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
if (val & ~KVM_REG_FEATURE_LEVEL_MASK)
return -EINVAL;
if (get_kernel_wa_level(reg->id) < val)
return -EINVAL;
return 0;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
if (val & ~(KVM_REG_FEATURE_LEVEL_MASK |
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED))
return -EINVAL;
/* The enabled bit must not be set unless the level is AVAIL. */
if ((val & KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED) &&
(val & KVM_REG_FEATURE_LEVEL_MASK) != KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL)
return -EINVAL;
/*
* Map all the possible incoming states to the only two we
* really want to deal with.
*/
switch (val & KVM_REG_FEATURE_LEVEL_MASK) {
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN:
wa_level = KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
break;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED:
wa_level = KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED;
break;
default:
return -EINVAL;
}
/*
* We can deal with NOT_AVAIL on NOT_REQUIRED, but not the
* other way around.
*/
if (get_kernel_wa_level(reg->id) < wa_level)
return -EINVAL;
return 0;
case KVM_REG_ARM_STD_BMAP:
case KVM_REG_ARM_STD_HYP_BMAP:
case KVM_REG_ARM_VENDOR_HYP_BMAP:
return kvm_arm_set_fw_reg_bmap(vcpu, reg->id, val);
default:
return -ENOENT;
}
return -EINVAL;
}

72
arch/arm64/kvm/mmu.c
View File

@ -258,8 +258,8 @@ static bool kvm_host_owns_hyp_mappings(void)
return true;
}
static int __create_hyp_mappings(unsigned long start, unsigned long size,
unsigned long phys, enum kvm_pgtable_prot prot)
int __create_hyp_mappings(unsigned long start, unsigned long size,
unsigned long phys, enum kvm_pgtable_prot prot)
{
int err;
@ -457,23 +457,22 @@ int create_hyp_mappings(void *from, void *to, enum kvm_pgtable_prot prot)
return 0;
}
static int __create_hyp_private_mapping(phys_addr_t phys_addr, size_t size,
unsigned long *haddr,
enum kvm_pgtable_prot prot)
/**
* hyp_alloc_private_va_range - Allocates a private VA range.
* @size: The size of the VA range to reserve.
* @haddr: The hypervisor virtual start address of the allocation.
*
* The private virtual address (VA) range is allocated below io_map_base
* and aligned based on the order of @size.
*
* Return: 0 on success or negative error code on failure.
*/
int hyp_alloc_private_va_range(size_t size, unsigned long *haddr)
{
unsigned long base;
int ret = 0;
if (!kvm_host_owns_hyp_mappings()) {
base = kvm_call_hyp_nvhe(__pkvm_create_private_mapping,
phys_addr, size, prot);
if (IS_ERR_OR_NULL((void *)base))
return PTR_ERR((void *)base);
*haddr = base;
return 0;
}
mutex_lock(&kvm_hyp_pgd_mutex);
/*
@ -484,8 +483,10 @@ static int __create_hyp_private_mapping(phys_addr_t phys_addr, size_t size,
*
* The allocated size is always a multiple of PAGE_SIZE.
*/
size = PAGE_ALIGN(size + offset_in_page(phys_addr));
base = io_map_base - size;
base = io_map_base - PAGE_ALIGN(size);
/* Align the allocation based on the order of its size */
base = ALIGN_DOWN(base, PAGE_SIZE << get_order(size));
/*
* Verify that BIT(VA_BITS - 1) hasn't been flipped by
@ -495,19 +496,40 @@ static int __create_hyp_private_mapping(phys_addr_t phys_addr, size_t size,
if ((base ^ io_map_base) & BIT(VA_BITS - 1))
ret = -ENOMEM;
else
io_map_base = base;
*haddr = io_map_base = base;
mutex_unlock(&kvm_hyp_pgd_mutex);
if (ret)
goto out;
return ret;
}
ret = __create_hyp_mappings(base, size, phys_addr, prot);
if (ret)
goto out;
static int __create_hyp_private_mapping(phys_addr_t phys_addr, size_t size,
unsigned long *haddr,
enum kvm_pgtable_prot prot)
{
unsigned long addr;
int ret = 0;
*haddr = base + offset_in_page(phys_addr);
out:
if (!kvm_host_owns_hyp_mappings()) {
addr = kvm_call_hyp_nvhe(__pkvm_create_private_mapping,
phys_addr, size, prot);
if (IS_ERR_VALUE(addr))
return addr;
*haddr = addr;
return 0;
}
size = PAGE_ALIGN(size + offset_in_page(phys_addr));
ret = hyp_alloc_private_va_range(size, &addr);
if (ret)
return ret;
ret = __create_hyp_mappings(addr, size, phys_addr, prot);
if (ret)
return ret;
*haddr = addr + offset_in_page(phys_addr);
return ret;
}

3
arch/arm64/kvm/pmu-emul.c
View File

@ -774,8 +774,7 @@ void kvm_host_pmu_init(struct arm_pmu *pmu)
{
struct arm_pmu_entry *entry;
if (pmu->pmuver == 0 || pmu->pmuver == ID_AA64DFR0_PMUVER_IMP_DEF ||
is_protected_kvm_enabled())
if (pmu->pmuver == 0 || pmu->pmuver == ID_AA64DFR0_PMUVER_IMP_DEF)
return;
mutex_lock(&arm_pmus_lock);

40
arch/arm64/kvm/pmu.c
View File

@ -5,7 +5,8 @@
*/
#include <linux/kvm_host.h>
#include <linux/perf_event.h>
#include <asm/kvm_hyp.h>
static DEFINE_PER_CPU(struct kvm_pmu_events, kvm_pmu_events);
/*
* Given the perf event attributes and system type, determine
@ -25,21 +26,26 @@ static bool kvm_pmu_switch_needed(struct perf_event_attr *attr)
return (attr->exclude_host != attr->exclude_guest);
}
struct kvm_pmu_events *kvm_get_pmu_events(void)
{
return this_cpu_ptr(&kvm_pmu_events);
}
/*
* Add events to track that we may want to switch at guest entry/exit
* time.
*/
void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr)
{
struct kvm_host_data *ctx = this_cpu_ptr_hyp_sym(kvm_host_data);
struct kvm_pmu_events *pmu = kvm_get_pmu_events();
if (!kvm_arm_support_pmu_v3() || !ctx || !kvm_pmu_switch_needed(attr))
if (!kvm_arm_support_pmu_v3() || !pmu || !kvm_pmu_switch_needed(attr))
return;
if (!attr->exclude_host)
ctx->pmu_events.events_host |= set;
pmu->events_host |= set;
if (!attr->exclude_guest)
ctx->pmu_events.events_guest |= set;
pmu->events_guest |= set;
}
/*
@ -47,13 +53,13 @@ void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr)
*/
void kvm_clr_pmu_events(u32 clr)
{
struct kvm_host_data *ctx = this_cpu_ptr_hyp_sym(kvm_host_data);
struct kvm_pmu_events *pmu = kvm_get_pmu_events();
if (!kvm_arm_support_pmu_v3() || !ctx)
if (!kvm_arm_support_pmu_v3() || !pmu)
return;
ctx->pmu_events.events_host &= ~clr;
ctx->pmu_events.events_guest &= ~clr;
pmu->events_host &= ~clr;
pmu->events_guest &= ~clr;
}
#define PMEVTYPER_READ_CASE(idx) \
@ -169,16 +175,16 @@ static void kvm_vcpu_pmu_disable_el0(unsigned long events)
*/
void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu)
{
struct kvm_host_data *host;
struct kvm_pmu_events *pmu;
u32 events_guest, events_host;
if (!kvm_arm_support_pmu_v3() || !has_vhe())
return;
preempt_disable();
host = this_cpu_ptr_hyp_sym(kvm_host_data);
events_guest = host->pmu_events.events_guest;
events_host = host->pmu_events.events_host;
pmu = kvm_get_pmu_events();
events_guest = pmu->events_guest;
events_host = pmu->events_host;
kvm_vcpu_pmu_enable_el0(events_guest);
kvm_vcpu_pmu_disable_el0(events_host);
@ -190,15 +196,15 @@ void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu)
*/
void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu)
{
struct kvm_host_data *host;
struct kvm_pmu_events *pmu;
u32 events_guest, events_host;
if (!kvm_arm_support_pmu_v3() || !has_vhe())
return;
host = this_cpu_ptr_hyp_sym(kvm_host_data);
events_guest = host->pmu_events.events_guest;
events_host = host->pmu_events.events_host;
pmu = kvm_get_pmu_events();
events_guest = pmu->events_guest;
events_host = pmu->events_host;
kvm_vcpu_pmu_enable_el0(events_host);
kvm_vcpu_pmu_disable_el0(events_guest);

248
arch/arm64/kvm/psci.c
View File

@ -51,13 +51,6 @@ static unsigned long kvm_psci_vcpu_suspend(struct kvm_vcpu *vcpu)
return PSCI_RET_SUCCESS;
}
static void kvm_psci_vcpu_off(struct kvm_vcpu *vcpu)
{
vcpu->arch.power_off = true;
kvm_make_request(KVM_REQ_SLEEP, vcpu);
kvm_vcpu_kick(vcpu);
}
static inline bool kvm_psci_valid_affinity(struct kvm_vcpu *vcpu,
unsigned long affinity)
{
@ -83,7 +76,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
*/
if (!vcpu)
return PSCI_RET_INVALID_PARAMS;
if (!vcpu->arch.power_off) {
if (!kvm_arm_vcpu_stopped(vcpu)) {
if (kvm_psci_version(source_vcpu) != KVM_ARM_PSCI_0_1)
return PSCI_RET_ALREADY_ON;
else
@ -107,12 +100,12 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
kvm_make_request(KVM_REQ_VCPU_RESET, vcpu);
/*
* Make sure the reset request is observed if the change to
* power_off is observed.
* Make sure the reset request is observed if the RUNNABLE mp_state is
* observed.
*/
smp_wmb();
vcpu->arch.power_off = false;
vcpu->arch.mp_state.mp_state = KVM_MP_STATE_RUNNABLE;
kvm_vcpu_wake_up(vcpu);
return PSCI_RET_SUCCESS;
@ -150,7 +143,7 @@ static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
mpidr = kvm_vcpu_get_mpidr_aff(tmp);
if ((mpidr & target_affinity_mask) == target_affinity) {
matching_cpus++;
if (!tmp->arch.power_off)
if (!kvm_arm_vcpu_stopped(tmp))
return PSCI_0_2_AFFINITY_LEVEL_ON;
}
}
@ -176,7 +169,7 @@ static void kvm_prepare_system_event(struct kvm_vcpu *vcpu, u32 type, u64 flags)
* re-initialized.
*/
kvm_for_each_vcpu(i, tmp, vcpu->kvm)
tmp->arch.power_off = true;
tmp->arch.mp_state.mp_state = KVM_MP_STATE_STOPPED;
kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP);
memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
@ -202,6 +195,15 @@ static void kvm_psci_system_reset2(struct kvm_vcpu *vcpu)
KVM_SYSTEM_EVENT_RESET_FLAG_PSCI_RESET2);
}
static void kvm_psci_system_suspend(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
memset(&run->system_event, 0, sizeof(vcpu->run->system_event));
run->system_event.type = KVM_SYSTEM_EVENT_SUSPEND;
run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
}
static void kvm_psci_narrow_to_32bit(struct kvm_vcpu *vcpu)
{
int i;
@ -245,7 +247,7 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
val = kvm_psci_vcpu_suspend(vcpu);
break;
case PSCI_0_2_FN_CPU_OFF:
kvm_psci_vcpu_off(vcpu);
kvm_arm_vcpu_power_off(vcpu);
val = PSCI_RET_SUCCESS;
break;
case PSCI_0_2_FN_CPU_ON:
@ -305,9 +307,10 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
{
unsigned long val = PSCI_RET_NOT_SUPPORTED;
u32 psci_fn = smccc_get_function(vcpu);
struct kvm *kvm = vcpu->kvm;
u32 arg;
unsigned long val;
int ret = 1;
switch(psci_fn) {
@ -320,6 +323,8 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
if (val)
break;
val = PSCI_RET_NOT_SUPPORTED;
switch(arg) {
case PSCI_0_2_FN_PSCI_VERSION:
case PSCI_0_2_FN_CPU_SUSPEND:
@ -336,18 +341,32 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
case ARM_SMCCC_VERSION_FUNC_ID:
val = 0;
break;
case PSCI_1_0_FN_SYSTEM_SUSPEND:
case PSCI_1_0_FN64_SYSTEM_SUSPEND:
if (test_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags))
val = 0;
break;
case PSCI_1_1_FN_SYSTEM_RESET2:
case PSCI_1_1_FN64_SYSTEM_RESET2:
if (minor >= 1) {
if (minor >= 1)
val = 0;
break;
}
fallthrough;
default:
val = PSCI_RET_NOT_SUPPORTED;
break;
}
break;
case PSCI_1_0_FN_SYSTEM_SUSPEND:
kvm_psci_narrow_to_32bit(vcpu);
fallthrough;
case PSCI_1_0_FN64_SYSTEM_SUSPEND:
/*
* Return directly to userspace without changing the vCPU's
* registers. Userspace depends on reading the SMCCC parameters
* to implement SYSTEM_SUSPEND.
*/
if (test_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags)) {
kvm_psci_system_suspend(vcpu);
return 0;
}
break;
case PSCI_1_1_FN_SYSTEM_RESET2:
kvm_psci_narrow_to_32bit(vcpu);
fallthrough;
@ -365,7 +384,7 @@ static int kvm_psci_1_x_call(struct kvm_vcpu *vcpu, u32 minor)
val = PSCI_RET_INVALID_PARAMS;
break;
}
fallthrough;
break;
default:
return kvm_psci_0_2_call(vcpu);
}
@ -382,7 +401,7 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
switch (psci_fn) {
case KVM_PSCI_FN_CPU_OFF:
kvm_psci_vcpu_off(vcpu);
kvm_arm_vcpu_power_off(vcpu);
val = PSCI_RET_SUCCESS;
break;
case KVM_PSCI_FN_CPU_ON:
@ -437,186 +456,3 @@ int kvm_psci_call(struct kvm_vcpu *vcpu)
return -EINVAL;
}
}
int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu)
{
return 4; /* PSCI version and three workaround registers */
}
int kvm_arm_copy_fw_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
{
if (put_user(KVM_REG_ARM_PSCI_VERSION, uindices++))
return -EFAULT;
if (put_user(KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1, uindices++))
return -EFAULT;
if (put_user(KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2, uindices++))
return -EFAULT;
if (put_user(KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3, uindices++))
return -EFAULT;
return 0;
}
#define KVM_REG_FEATURE_LEVEL_WIDTH 4
#define KVM_REG_FEATURE_LEVEL_MASK (BIT(KVM_REG_FEATURE_LEVEL_WIDTH) - 1)
/*
* Convert the workaround level into an easy-to-compare number, where higher
* values mean better protection.
*/
static int get_kernel_wa_level(u64 regid)
{
switch (regid) {
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
switch (arm64_get_spectre_v2_state()) {
case SPECTRE_VULNERABLE:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL;
case SPECTRE_MITIGATED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_AVAIL;
case SPECTRE_UNAFFECTED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_REQUIRED;
}
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1_NOT_AVAIL;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
switch (arm64_get_spectre_v4_state()) {
case SPECTRE_MITIGATED:
/*
* As for the hypercall discovery, we pretend we
* don't have any FW mitigation if SSBS is there at
* all times.
*/
if (cpus_have_final_cap(ARM64_SSBS))
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
fallthrough;
case SPECTRE_UNAFFECTED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED;
case SPECTRE_VULNERABLE:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
}
break;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
switch (arm64_get_spectre_bhb_state()) {
case SPECTRE_VULNERABLE:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_NOT_AVAIL;
case SPECTRE_MITIGATED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_AVAIL;
case SPECTRE_UNAFFECTED:
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_NOT_REQUIRED;
}
return KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3_NOT_AVAIL;
}
return -EINVAL;
}
int kvm_arm_get_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
void __user *uaddr = (void __user *)(long)reg->addr;
u64 val;
switch (reg->id) {
case KVM_REG_ARM_PSCI_VERSION:
val = kvm_psci_version(vcpu);
break;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
val = get_kernel_wa_level(reg->id) & KVM_REG_FEATURE_LEVEL_MASK;
break;
default:
return -ENOENT;
}
if (copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
void __user *uaddr = (void __user *)(long)reg->addr;
u64 val;
int wa_level;
if (copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
switch (reg->id) {
case KVM_REG_ARM_PSCI_VERSION:
{
bool wants_02;
wants_02 = test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features);
switch (val) {
case KVM_ARM_PSCI_0_1:
if (wants_02)
return -EINVAL;
vcpu->kvm->arch.psci_version = val;
return 0;
case KVM_ARM_PSCI_0_2:
case KVM_ARM_PSCI_1_0:
case KVM_ARM_PSCI_1_1:
if (!wants_02)
return -EINVAL;
vcpu->kvm->arch.psci_version = val;
return 0;
}
break;
}
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_1:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_3:
if (val & ~KVM_REG_FEATURE_LEVEL_MASK)
return -EINVAL;
if (get_kernel_wa_level(reg->id) < val)
return -EINVAL;
return 0;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2:
if (val & ~(KVM_REG_FEATURE_LEVEL_MASK |
KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED))
return -EINVAL;
/* The enabled bit must not be set unless the level is AVAIL. */
if ((val & KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_ENABLED) &&
(val & KVM_REG_FEATURE_LEVEL_MASK) != KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL)
return -EINVAL;
/*
* Map all the possible incoming states to the only two we
* really want to deal with.
*/
switch (val & KVM_REG_FEATURE_LEVEL_MASK) {
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_UNKNOWN:
wa_level = KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_AVAIL;
break;
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_AVAIL:
case KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED:
wa_level = KVM_REG_ARM_SMCCC_ARCH_WORKAROUND_2_NOT_REQUIRED;
break;
default:
return -EINVAL;
}
/*
* We can deal with NOT_AVAIL on NOT_REQUIRED, but not the
* other way around.
*/
if (get_kernel_wa_level(reg->id) < wa_level)
return -EINVAL;
return 0;
default:
return -ENOENT;
}
return -EINVAL;
}

294
arch/arm64/kvm/sys_regs.c
View File

@ -1145,6 +1145,8 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
if (!vcpu_has_ptrauth(vcpu))
val &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR2_APA3) |
ARM64_FEATURE_MASK(ID_AA64ISAR2_GPA3));
if (!cpus_have_final_cap(ARM64_HAS_WFXT))
val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_WFXT);
break;
case SYS_ID_AA64DFR0_EL1:
/* Limit debug to ARMv8.0 */
@ -2020,20 +2022,22 @@ static const struct sys_reg_desc cp14_64_regs[] = {
{ Op1( 0), CRm( 2), .access = trap_raz_wi },
};
#define CP15_PMU_SYS_REG(_map, _Op1, _CRn, _CRm, _Op2) \
AA32(_map), \
Op1(_Op1), CRn(_CRn), CRm(_CRm), Op2(_Op2), \
.visibility = pmu_visibility
/* Macro to expand the PMEVCNTRn register */
#define PMU_PMEVCNTR(n) \
/* PMEVCNTRn */ \
{ Op1(0), CRn(0b1110), \
CRm((0b1000 | (((n) >> 3) & 0x3))), Op2(((n) & 0x7)), \
access_pmu_evcntr }
{ CP15_PMU_SYS_REG(DIRECT, 0, 0b1110, \
(0b1000 | (((n) >> 3) & 0x3)), ((n) & 0x7)), \
.access = access_pmu_evcntr }
/* Macro to expand the PMEVTYPERn register */
#define PMU_PMEVTYPER(n) \
/* PMEVTYPERn */ \
{ Op1(0), CRn(0b1110), \
CRm((0b1100 | (((n) >> 3) & 0x3))), Op2(((n) & 0x7)), \
access_pmu_evtyper }
{ CP15_PMU_SYS_REG(DIRECT, 0, 0b1110, \
(0b1100 | (((n) >> 3) & 0x3)), ((n) & 0x7)), \
.access = access_pmu_evtyper }
/*
* Trapped cp15 registers. TTBR0/TTBR1 get a double encoding,
* depending on the way they are accessed (as a 32bit or a 64bit
@ -2073,25 +2077,25 @@ static const struct sys_reg_desc cp15_regs[] = {
{ Op1( 0), CRn( 7), CRm(14), Op2( 2), access_dcsw },
/* PMU */
{ Op1( 0), CRn( 9), CRm(12), Op2( 0), access_pmcr },
{ Op1( 0), CRn( 9), CRm(12), Op2( 1), access_pmcnten },
{ Op1( 0), CRn( 9), CRm(12), Op2( 2), access_pmcnten },
{ Op1( 0), CRn( 9), CRm(12), Op2( 3), access_pmovs },
{ Op1( 0), CRn( 9), CRm(12), Op2( 4), access_pmswinc },
{ Op1( 0), CRn( 9), CRm(12), Op2( 5), access_pmselr },
{ AA32(LO), Op1( 0), CRn( 9), CRm(12), Op2( 6), access_pmceid },
{ AA32(LO), Op1( 0), CRn( 9), CRm(12), Op2( 7), access_pmceid },
{ Op1( 0), CRn( 9), CRm(13), Op2( 0), access_pmu_evcntr },
{ Op1( 0), CRn( 9), CRm(13), Op2( 1), access_pmu_evtyper },
{ Op1( 0), CRn( 9), CRm(13), Op2( 2), access_pmu_evcntr },
{ Op1( 0), CRn( 9), CRm(14), Op2( 0), access_pmuserenr },
{ Op1( 0), CRn( 9), CRm(14), Op2( 1), access_pminten },
{ Op1( 0), CRn( 9), CRm(14), Op2( 2), access_pminten },
{ Op1( 0), CRn( 9), CRm(14), Op2( 3), access_pmovs },
{ AA32(HI), Op1( 0), CRn( 9), CRm(14), Op2( 4), access_pmceid },
{ AA32(HI), Op1( 0), CRn( 9), CRm(14), Op2( 5), access_pmceid },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 0), .access = access_pmcr },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 1), .access = access_pmcnten },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 2), .access = access_pmcnten },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 3), .access = access_pmovs },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 4), .access = access_pmswinc },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 12, 5), .access = access_pmselr },
{ CP15_PMU_SYS_REG(LO, 0, 9, 12, 6), .access = access_pmceid },
{ CP15_PMU_SYS_REG(LO, 0, 9, 12, 7), .access = access_pmceid },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 0), .access = access_pmu_evcntr },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 1), .access = access_pmu_evtyper },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 13, 2), .access = access_pmu_evcntr },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 0), .access = access_pmuserenr },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 1), .access = access_pminten },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 2), .access = access_pminten },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 3), .access = access_pmovs },
{ CP15_PMU_SYS_REG(HI, 0, 9, 14, 4), .access = access_pmceid },
{ CP15_PMU_SYS_REG(HI, 0, 9, 14, 5), .access = access_pmceid },
/* PMMIR */
{ Op1( 0), CRn( 9), CRm(14), Op2( 6), trap_raz_wi },
{ CP15_PMU_SYS_REG(DIRECT, 0, 9, 14, 6), .access = trap_raz_wi },
/* PRRR/MAIR0 */
{ AA32(LO), Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, MAIR_EL1 },
@ -2176,7 +2180,7 @@ static const struct sys_reg_desc cp15_regs[] = {
PMU_PMEVTYPER(29),
PMU_PMEVTYPER(30),
/* PMCCFILTR */
{ Op1(0), CRn(14), CRm(15), Op2(7), access_pmu_evtyper },
{ CP15_PMU_SYS_REG(DIRECT, 0, 14, 15, 7), .access = access_pmu_evtyper },
{ Op1(1), CRn( 0), CRm( 0), Op2(0), access_ccsidr },
{ Op1(1), CRn( 0), CRm( 0), Op2(1), access_clidr },
@ -2185,7 +2189,7 @@ static const struct sys_reg_desc cp15_regs[] = {
static const struct sys_reg_desc cp15_64_regs[] = {
{ Op1( 0), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR0_EL1 },
{ Op1( 0), CRn( 0), CRm( 9), Op2( 0), access_pmu_evcntr },
{ CP15_PMU_SYS_REG(DIRECT, 0, 0, 9, 0), .access = access_pmu_evcntr },
{ Op1( 0), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI1R */
{ Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, TTBR1_EL1 },
{ Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */
@ -2193,25 +2197,24 @@ static const struct sys_reg_desc cp15_64_regs[] = {
{ SYS_DESC(SYS_AARCH32_CNTP_CVAL), access_arch_timer },
};
static int check_sysreg_table(const struct sys_reg_desc *table, unsigned int n,
bool is_32)
static bool check_sysreg_table(const struct sys_reg_desc *table, unsigned int n,
bool is_32)
{
unsigned int i;
for (i = 0; i < n; i++) {
if (!is_32 && table[i].reg && !table[i].reset) {
kvm_err("sys_reg table %p entry %d has lacks reset\n",
table, i);
return 1;
kvm_err("sys_reg table %pS entry %d lacks reset\n", &table[i], i);
return false;
}
if (i && cmp_sys_reg(&table[i-1], &table[i]) >= 0) {
kvm_err("sys_reg table %p out of order (%d)\n", table, i - 1);
return 1;
kvm_err("sys_reg table %pS entry %d out of order\n", &table[i - 1], i - 1);
return false;
}
}
return 0;
return true;
}
int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu)
@ -2252,27 +2255,27 @@ static void perform_access(struct kvm_vcpu *vcpu,
* @table: array of trap descriptors
* @num: size of the trap descriptor array
*
* Return 0 if the access has been handled, and -1 if not.
* Return true if the access has been handled, false if not.
*/
static int emulate_cp(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *table,
size_t num)
static bool emulate_cp(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *table,
size_t num)
{
const struct sys_reg_desc *r;
if (!table)
return -1; /* Not handled */
return false; /* Not handled */
r = find_reg(params, table, num);
if (r) {
perform_access(vcpu, params, r);
return 0;
return true;
}
/* Not handled */
return -1;
return false;
}
static void unhandled_cp_access(struct kvm_vcpu *vcpu,
@ -2336,7 +2339,7 @@ static int kvm_handle_cp_64(struct kvm_vcpu *vcpu,
* potential register operation in the case of a read and return
* with success.
*/
if (!emulate_cp(vcpu, &params, global, nr_global)) {
if (emulate_cp(vcpu, &params, global, nr_global)) {
/* Split up the value between registers for the read side */
if (!params.is_write) {
vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval));
@ -2350,34 +2353,144 @@ static int kvm_handle_cp_64(struct kvm_vcpu *vcpu,
return 1;
}
static bool emulate_sys_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *params);
/*
* The CP10 ID registers are architecturally mapped to AArch64 feature
* registers. Abuse that fact so we can rely on the AArch64 handler for accesses
* from AArch32.
*/
static bool kvm_esr_cp10_id_to_sys64(u64 esr, struct sys_reg_params *params)
{
u8 reg_id = (esr >> 10) & 0xf;
bool valid;
params->is_write = ((esr & 1) == 0);
params->Op0 = 3;
params->Op1 = 0;
params->CRn = 0;
params->CRm = 3;
/* CP10 ID registers are read-only */
valid = !params->is_write;
switch (reg_id) {
/* MVFR0 */
case 0b0111:
params->Op2 = 0;
break;
/* MVFR1 */
case 0b0110:
params->Op2 = 1;
break;
/* MVFR2 */
case 0b0101:
params->Op2 = 2;
break;
default:
valid = false;
}
if (valid)
return true;
kvm_pr_unimpl("Unhandled cp10 register %s: %u\n",
params->is_write ? "write" : "read", reg_id);
return false;
}
/**
* kvm_handle_cp10_id() - Handles a VMRS trap on guest access to a 'Media and
* VFP Register' from AArch32.
* @vcpu: The vCPU pointer
*
* MVFR{0-2} are architecturally mapped to the AArch64 MVFR{0-2}_EL1 registers.
* Work out the correct AArch64 system register encoding and reroute to the
* AArch64 system register emulation.
*/
int kvm_handle_cp10_id(struct kvm_vcpu *vcpu)
{
int Rt = kvm_vcpu_sys_get_rt(vcpu);
u64 esr = kvm_vcpu_get_esr(vcpu);
struct sys_reg_params params;
/* UNDEF on any unhandled register access */
if (!kvm_esr_cp10_id_to_sys64(esr, &params)) {
kvm_inject_undefined(vcpu);
return 1;
}
if (emulate_sys_reg(vcpu, &params))
vcpu_set_reg(vcpu, Rt, params.regval);
return 1;
}
/**
* kvm_emulate_cp15_id_reg() - Handles an MRC trap on a guest CP15 access where
* CRn=0, which corresponds to the AArch32 feature
* registers.
* @vcpu: the vCPU pointer
* @params: the system register access parameters.
*
* Our cp15 system register tables do not enumerate the AArch32 feature
* registers. Conveniently, our AArch64 table does, and the AArch32 system
* register encoding can be trivially remapped into the AArch64 for the feature
* registers: Append op0=3, leaving op1, CRn, CRm, and op2 the same.
*
* According to DDI0487G.b G7.3.1, paragraph "Behavior of VMSAv8-32 32-bit
* System registers with (coproc=0b1111, CRn==c0)", read accesses from this
* range are either UNKNOWN or RES0. Rerouting remains architectural as we
* treat undefined registers in this range as RAZ.
*/
static int kvm_emulate_cp15_id_reg(struct kvm_vcpu *vcpu,
struct sys_reg_params *params)
{
int Rt = kvm_vcpu_sys_get_rt(vcpu);
/* Treat impossible writes to RO registers as UNDEFINED */
if (params->is_write) {
unhandled_cp_access(vcpu, params);
return 1;
}
params->Op0 = 3;
/*
* All registers where CRm > 3 are known to be UNKNOWN/RAZ from AArch32.
* Avoid conflicting with future expansion of AArch64 feature registers
* and simply treat them as RAZ here.
*/
if (params->CRm > 3)
params->regval = 0;
else if (!emulate_sys_reg(vcpu, params))
return 1;
vcpu_set_reg(vcpu, Rt, params->regval);
return 1;
}
/**
* kvm_handle_cp_32 -- handles a mrc/mcr trap on a guest CP14/CP15 access
* @vcpu: The VCPU pointer
* @run: The kvm_run struct
*/
static int kvm_handle_cp_32(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *global,
size_t nr_global)
{
struct sys_reg_params params;
u64 esr = kvm_vcpu_get_esr(vcpu);
int Rt = kvm_vcpu_sys_get_rt(vcpu);
params.CRm = (esr >> 1) & 0xf;
params.regval = vcpu_get_reg(vcpu, Rt);
params.is_write = ((esr & 1) == 0);
params.CRn = (esr >> 10) & 0xf;
params.Op0 = 0;
params.Op1 = (esr >> 14) & 0x7;
params.Op2 = (esr >> 17) & 0x7;
params->regval = vcpu_get_reg(vcpu, Rt);
if (!emulate_cp(vcpu, &params, global, nr_global)) {
if (!params.is_write)
vcpu_set_reg(vcpu, Rt, params.regval);
if (emulate_cp(vcpu, params, global, nr_global)) {
if (!params->is_write)
vcpu_set_reg(vcpu, Rt, params->regval);
return 1;
}
unhandled_cp_access(vcpu, &params);
unhandled_cp_access(vcpu, params);
return 1;
}
@ -2388,7 +2501,20 @@ int kvm_handle_cp15_64(struct kvm_vcpu *vcpu)
int kvm_handle_cp15_32(struct kvm_vcpu *vcpu)
{
return kvm_handle_cp_32(vcpu, cp15_regs, ARRAY_SIZE(cp15_regs));
struct sys_reg_params params;
params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu));
/*
* Certain AArch32 ID registers are handled by rerouting to the AArch64
* system register table. Registers in the ID range where CRm=0 are
* excluded from this scheme as they do not trivially map into AArch64
* system register encodings.
*/
if (params.Op1 == 0 && params.CRn == 0 && params.CRm)
return kvm_emulate_cp15_id_reg(vcpu, &params);
return kvm_handle_cp_32(vcpu, &params, cp15_regs, ARRAY_SIZE(cp15_regs));
}
int kvm_handle_cp14_64(struct kvm_vcpu *vcpu)
@ -2398,7 +2524,11 @@ int kvm_handle_cp14_64(struct kvm_vcpu *vcpu)
int kvm_handle_cp14_32(struct kvm_vcpu *vcpu)
{
return kvm_handle_cp_32(vcpu, cp14_regs, ARRAY_SIZE(cp14_regs));
struct sys_reg_params params;
params = esr_cp1x_32_to_params(kvm_vcpu_get_esr(vcpu));
return kvm_handle_cp_32(vcpu, &params, cp14_regs, ARRAY_SIZE(cp14_regs));
}
static bool is_imp_def_sys_reg(struct sys_reg_params *params)
@ -2407,7 +2537,14 @@ static bool is_imp_def_sys_reg(struct sys_reg_params *params)
return params->Op0 == 3 && (params->CRn & 0b1011) == 0b1011;
}
static int emulate_sys_reg(struct kvm_vcpu *vcpu,
/**
* emulate_sys_reg - Emulate a guest access to an AArch64 system register
* @vcpu: The VCPU pointer
* @params: Decoded system register parameters
*
* Return: true if the system register access was successful, false otherwise.
*/
static bool emulate_sys_reg(struct kvm_vcpu *vcpu,
struct sys_reg_params *params)
{
const struct sys_reg_desc *r;
@ -2416,7 +2553,10 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu,
if (likely(r)) {
perform_access(vcpu, params, r);
} else if (is_imp_def_sys_reg(params)) {
return true;
}
if (is_imp_def_sys_reg(params)) {
kvm_inject_undefined(vcpu);
} else {
print_sys_reg_msg(params,
@ -2424,7 +2564,7 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu,
*vcpu_pc(vcpu), *vcpu_cpsr(vcpu));
kvm_inject_undefined(vcpu);
}
return 1;
return false;
}
/**
@ -2452,18 +2592,18 @@ int kvm_handle_sys_reg(struct kvm_vcpu *vcpu)
struct sys_reg_params params;
unsigned long esr = kvm_vcpu_get_esr(vcpu);
int Rt = kvm_vcpu_sys_get_rt(vcpu);
int ret;
trace_kvm_handle_sys_reg(esr);
params = esr_sys64_to_params(esr);
params.regval = vcpu_get_reg(vcpu, Rt);
ret = emulate_sys_reg(vcpu, &params);
if (!emulate_sys_reg(vcpu, &params))
return 1;
if (!params.is_write)
vcpu_set_reg(vcpu, Rt, params.regval);
return ret;
return 1;
}
/******************************************************************************
@ -2866,18 +3006,22 @@ int kvm_arm_copy_sys_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
return write_demux_regids(uindices);
}
void kvm_sys_reg_table_init(void)
int kvm_sys_reg_table_init(void)
{
bool valid = true;
unsigned int i;
struct sys_reg_desc clidr;
/* Make sure tables are unique and in order. */
BUG_ON(check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs), false));
BUG_ON(check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs), true));
BUG_ON(check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs), true));
BUG_ON(check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs), true));
BUG_ON(check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs), true));
BUG_ON(check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs), false));
valid &= check_sysreg_table(sys_reg_descs, ARRAY_SIZE(sys_reg_descs), false);
valid &= check_sysreg_table(cp14_regs, ARRAY_SIZE(cp14_regs), true);
valid &= check_sysreg_table(cp14_64_regs, ARRAY_SIZE(cp14_64_regs), true);
valid &= check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs), true);
valid &= check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs), true);
valid &= check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs), false);
if (!valid)
return -EINVAL;
/* We abuse the reset function to overwrite the table itself. */
for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++)
@ -2900,4 +3044,6 @@ void kvm_sys_reg_table_init(void)
break;
/* Clear all higher bits. */
cache_levels &= (1 << (i*3))-1;
return 0;
}

9
arch/arm64/kvm/sys_regs.h
View File

@ -35,12 +35,19 @@ struct sys_reg_params {
.Op2 = ((esr) >> 17) & 0x7, \
.is_write = !((esr) & 1) })
#define esr_cp1x_32_to_params(esr) \
((struct sys_reg_params){ .Op1 = ((esr) >> 14) & 0x7, \
.CRn = ((esr) >> 10) & 0xf, \
.CRm = ((esr) >> 1) & 0xf, \
.Op2 = ((esr) >> 17) & 0x7, \
.is_write = !((esr) & 1) })
struct sys_reg_desc {
/* Sysreg string for debug */
const char *name;
enum {
AA32_ZEROHIGH,
AA32_DIRECT,
AA32_LO,
AA32_HI,
} aarch32_map;

13
arch/arm64/kvm/vgic/vgic-init.c
View File

@ -98,11 +98,11 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
ret = 0;
if (type == KVM_DEV_TYPE_ARM_VGIC_V2)
kvm->arch.max_vcpus = VGIC_V2_MAX_CPUS;
kvm->max_vcpus = VGIC_V2_MAX_CPUS;
else
kvm->arch.max_vcpus = VGIC_V3_MAX_CPUS;
kvm->max_vcpus = VGIC_V3_MAX_CPUS;
if (atomic_read(&kvm->online_vcpus) > kvm->arch.max_vcpus) {
if (atomic_read(&kvm->online_vcpus) > kvm->max_vcpus) {
ret = -E2BIG;
goto out_unlock;
}
@ -319,7 +319,12 @@ int vgic_init(struct kvm *kvm)
vgic_debug_init(kvm);
dist->implementation_rev = 2;
/*
* If userspace didn't set the GIC implementation revision,
* default to the latest and greatest. You know want it.
*/
if (!dist->implementation_rev)
dist->implementation_rev = KVM_VGIC_IMP_REV_LATEST;
dist->initialized = true;
out:

160
arch/arm64/kvm/vgic/vgic-its.c
View File

@ -683,7 +683,7 @@ int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
if (!vcpu)
return E_ITS_INT_UNMAPPED_INTERRUPT;
if (!vcpu->arch.vgic_cpu.lpis_enabled)
if (!vgic_lpis_enabled(vcpu))
return -EBUSY;
vgic_its_cache_translation(kvm, its, devid, eventid, ite->irq);
@ -894,6 +894,18 @@ static int vgic_its_cmd_handle_movi(struct kvm *kvm, struct vgic_its *its,
return update_affinity(ite->irq, vcpu);
}
static bool __is_visible_gfn_locked(struct vgic_its *its, gpa_t gpa)
{
gfn_t gfn = gpa >> PAGE_SHIFT;
int idx;
bool ret;
idx = srcu_read_lock(&its->dev->kvm->srcu);
ret = kvm_is_visible_gfn(its->dev->kvm, gfn);
srcu_read_unlock(&its->dev->kvm->srcu, idx);
return ret;
}
/*
* Check whether an ID can be stored into the corresponding guest table.
* For a direct table this is pretty easy, but gets a bit nasty for
@ -908,9 +920,7 @@ static bool vgic_its_check_id(struct vgic_its *its, u64 baser, u32 id,
u64 indirect_ptr, type = GITS_BASER_TYPE(baser);
phys_addr_t base = GITS_BASER_ADDR_48_to_52(baser);
int esz = GITS_BASER_ENTRY_SIZE(baser);
int index, idx;
gfn_t gfn;
bool ret;
int index;
switch (type) {
case GITS_BASER_TYPE_DEVICE:
@ -933,12 +943,11 @@ static bool vgic_its_check_id(struct vgic_its *its, u64 baser, u32 id,
return false;
addr = base + id * esz;
gfn = addr >> PAGE_SHIFT;
if (eaddr)
*eaddr = addr;
goto out;
return __is_visible_gfn_locked(its, addr);
}
/* calculate and check the index into the 1st level */
@ -964,27 +973,42 @@ static bool vgic_its_check_id(struct vgic_its *its, u64 baser, u32 id,
/* Find the address of the actual entry */
index = id % (SZ_64K / esz);
indirect_ptr += index * esz;
gfn = indirect_ptr >> PAGE_SHIFT;
if (eaddr)
*eaddr = indirect_ptr;
out:
idx = srcu_read_lock(&its->dev->kvm->srcu);
ret = kvm_is_visible_gfn(its->dev->kvm, gfn);
srcu_read_unlock(&its->dev->kvm->srcu, idx);
return ret;
return __is_visible_gfn_locked(its, indirect_ptr);
}
/*
* Check whether an event ID can be stored in the corresponding Interrupt
* Translation Table, which starts at device->itt_addr.
*/
static bool vgic_its_check_event_id(struct vgic_its *its, struct its_device *device,
u32 event_id)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
int ite_esz = abi->ite_esz;
gpa_t gpa;
/* max table size is: BIT_ULL(device->num_eventid_bits) * ite_esz */
if (event_id >= BIT_ULL(device->num_eventid_bits))
return false;
gpa = device->itt_addr + event_id * ite_esz;
return __is_visible_gfn_locked(its, gpa);
}
/*
* Add a new collection into the ITS collection table.
* Returns 0 on success, and a negative error value for generic errors.
*/
static int vgic_its_alloc_collection(struct vgic_its *its,
struct its_collection **colp,
u32 coll_id)
{
struct its_collection *collection;
if (!vgic_its_check_id(its, its->baser_coll_table, coll_id, NULL))
return E_ITS_MAPC_COLLECTION_OOR;
collection = kzalloc(sizeof(*collection), GFP_KERNEL_ACCOUNT);
if (!collection)
return -ENOMEM;
@ -1061,7 +1085,7 @@ static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its,
if (!device)
return E_ITS_MAPTI_UNMAPPED_DEVICE;
if (event_id >= BIT_ULL(device->num_eventid_bits))
if (!vgic_its_check_event_id(its, device, event_id))
return E_ITS_MAPTI_ID_OOR;
if (its_cmd_get_command(its_cmd) == GITS_CMD_MAPTI)
@ -1078,7 +1102,12 @@ static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its,
collection = find_collection(its, coll_id);
if (!collection) {
int ret = vgic_its_alloc_collection(its, &collection, coll_id);
int ret;
if (!vgic_its_check_id(its, its->baser_coll_table, coll_id, NULL))
return E_ITS_MAPC_COLLECTION_OOR;
ret = vgic_its_alloc_collection(its, &collection, coll_id);
if (ret)
return ret;
new_coll = collection;
@ -1233,6 +1262,10 @@ static int vgic_its_cmd_handle_mapc(struct kvm *kvm, struct vgic_its *its,
if (!collection) {
int ret;
if (!vgic_its_check_id(its, its->baser_coll_table,
coll_id, NULL))
return E_ITS_MAPC_COLLECTION_OOR;
ret = vgic_its_alloc_collection(its, &collection,
coll_id);
if (ret)
@ -1272,6 +1305,11 @@ static int vgic_its_cmd_handle_clear(struct kvm *kvm, struct vgic_its *its,
return 0;
}
int vgic_its_inv_lpi(struct kvm *kvm, struct vgic_irq *irq)
{
return update_lpi_config(kvm, irq, NULL, true);
}
/*
* The INV command syncs the configuration bits from the memory table.
* Must be called with the its_lock mutex held.
@ -1288,7 +1326,41 @@ static int vgic_its_cmd_handle_inv(struct kvm *kvm, struct vgic_its *its,
if (!ite)
return E_ITS_INV_UNMAPPED_INTERRUPT;
return update_lpi_config(kvm, ite->irq, NULL, true);
return vgic_its_inv_lpi(kvm, ite->irq);
}
/**
* vgic_its_invall - invalidate all LPIs targetting a given vcpu
* @vcpu: the vcpu for which the RD is targetted by an invalidation
*
* Contrary to the INVALL command, this targets a RD instead of a
* collection, and we don't need to hold the its_lock, since no ITS is
* involved here.
*/
int vgic_its_invall(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
int irq_count, i = 0;
u32 *intids;
irq_count = vgic_copy_lpi_list(kvm, vcpu, &intids);
if (irq_count < 0)
return irq_count;
for (i = 0; i < irq_count; i++) {
struct vgic_irq *irq = vgic_get_irq(kvm, NULL, intids[i]);
if (!irq)
continue;
update_lpi_config(kvm, irq, vcpu, false);
vgic_put_irq(kvm, irq);
}
kfree(intids);
if (vcpu->arch.vgic_cpu.vgic_v3.its_vpe.its_vm)
its_invall_vpe(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe);
return 0;
}
/*
@ -1305,32 +1377,13 @@ static int vgic_its_cmd_handle_invall(struct kvm *kvm, struct vgic_its *its,
u32 coll_id = its_cmd_get_collection(its_cmd);
struct its_collection *collection;
struct kvm_vcpu *vcpu;
struct vgic_irq *irq;
u32 *intids;
int irq_count, i;
collection = find_collection(its, coll_id);
if (!its_is_collection_mapped(collection))
return E_ITS_INVALL_UNMAPPED_COLLECTION;
vcpu = kvm_get_vcpu(kvm, collection->target_addr);
irq_count = vgic_copy_lpi_list(kvm, vcpu, &intids);
if (irq_count < 0)
return irq_count;
for (i = 0; i < irq_count; i++) {
irq = vgic_get_irq(kvm, NULL, intids[i]);
if (!irq)
continue;
update_lpi_config(kvm, irq, vcpu, false);
vgic_put_irq(kvm, irq);
}
kfree(intids);
if (vcpu->arch.vgic_cpu.vgic_v3.its_vpe.its_vm)
its_invall_vpe(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe);
vgic_its_invall(vcpu);
return 0;
}
@ -2175,6 +2228,9 @@ static int vgic_its_restore_ite(struct vgic_its *its, u32 event_id,
if (!collection)
return -EINVAL;
if (!vgic_its_check_event_id(its, dev, event_id))
return -EINVAL;
ite = vgic_its_alloc_ite(dev, collection, event_id);
if (IS_ERR(ite))
return PTR_ERR(ite);
@ -2183,8 +2239,10 @@ static int vgic_its_restore_ite(struct vgic_its *its, u32 event_id,
vcpu = kvm_get_vcpu(kvm, collection->target_addr);
irq = vgic_add_lpi(kvm, lpi_id, vcpu);
if (IS_ERR(irq))
if (IS_ERR(irq)) {
its_free_ite(kvm, ite);
return PTR_ERR(irq);
}
ite->irq = irq;
return offset;
@ -2296,6 +2354,7 @@ static int vgic_its_restore_dte(struct vgic_its *its, u32 id,
void *ptr, void *opaque)
{
struct its_device *dev;
u64 baser = its->baser_device_table;
gpa_t itt_addr;
u8 num_eventid_bits;
u64 entry = *(u64 *)ptr;
@ -2316,6 +2375,9 @@ static int vgic_its_restore_dte(struct vgic_its *its, u32 id,
/* dte entry is valid */
offset = (entry & KVM_ITS_DTE_NEXT_MASK) >> KVM_ITS_DTE_NEXT_SHIFT;
if (!vgic_its_check_id(its, baser, id, NULL))
return -EINVAL;
dev = vgic_its_alloc_device(its, id, itt_addr, num_eventid_bits);
if (IS_ERR(dev))
return PTR_ERR(dev);
@ -2445,6 +2507,9 @@ static int vgic_its_restore_device_tables(struct vgic_its *its)
if (ret > 0)
ret = 0;
if (ret < 0)
vgic_its_free_device_list(its->dev->kvm, its);
return ret;
}
@ -2461,6 +2526,11 @@ static int vgic_its_save_cte(struct vgic_its *its,
return kvm_write_guest_lock(its->dev->kvm, gpa, &val, esz);
}
/*
* Restore a collection entry into the ITS collection table.
* Return +1 on success, 0 if the entry was invalid (which should be
* interpreted as end-of-table), and a negative error value for generic errors.
*/
static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
{
struct its_collection *collection;
@ -2487,6 +2557,10 @@ static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
collection = find_collection(its, coll_id);
if (collection)
return -EEXIST;
if (!vgic_its_check_id(its, its->baser_coll_table, coll_id, NULL))
return -EINVAL;
ret = vgic_its_alloc_collection(its, &collection, coll_id);
if (ret)
return ret;
@ -2566,6 +2640,9 @@ static int vgic_its_restore_collection_table(struct vgic_its *its)
if (ret > 0)
return 0;
if (ret < 0)
vgic_its_free_collection_list(its->dev->kvm, its);
return ret;
}
@ -2597,7 +2674,10 @@ static int vgic_its_restore_tables_v0(struct vgic_its *its)
if (ret)
return ret;
return vgic_its_restore_device_tables(its);
ret = vgic_its_restore_device_tables(its);
if (ret)
vgic_its_free_collection_list(its->dev->kvm, its);
return ret;
}
static int vgic_its_commit_v0(struct vgic_its *its)

18
arch/arm64/kvm/vgic/vgic-mmio-v2.c
View File

@ -73,9 +73,13 @@ static int vgic_mmio_uaccess_write_v2_misc(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
u32 reg;
switch (addr & 0x0c) {
case GIC_DIST_IIDR:
if (val != vgic_mmio_read_v2_misc(vcpu, addr, len))
reg = vgic_mmio_read_v2_misc(vcpu, addr, len);
if ((reg ^ val) & ~GICD_IIDR_REVISION_MASK)
return -EINVAL;
/*
@ -87,8 +91,16 @@ static int vgic_mmio_uaccess_write_v2_misc(struct kvm_vcpu *vcpu,
* migration from old kernels to new kernels with legacy
* userspace.
*/
vcpu->kvm->arch.vgic.v2_groups_user_writable = true;
return 0;
reg = FIELD_GET(GICD_IIDR_REVISION_MASK, reg);
switch (reg) {
case KVM_VGIC_IMP_REV_2:
case KVM_VGIC_IMP_REV_3:
vcpu->kvm->arch.vgic.v2_groups_user_writable = true;
dist->implementation_rev = reg;
return 0;
default:
return -EINVAL;
}
}
vgic_mmio_write_v2_misc(vcpu, addr, len, val);

125
arch/arm64/kvm/vgic/vgic-mmio-v3.c
View File

@ -155,13 +155,27 @@ static int vgic_mmio_uaccess_write_v3_misc(struct kvm_vcpu *vcpu,
unsigned long val)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
u32 reg;
switch (addr & 0x0c) {
case GICD_TYPER2:
case GICD_IIDR:
if (val != vgic_mmio_read_v3_misc(vcpu, addr, len))
return -EINVAL;
return 0;
case GICD_IIDR:
reg = vgic_mmio_read_v3_misc(vcpu, addr, len);
if ((reg ^ val) & ~GICD_IIDR_REVISION_MASK)
return -EINVAL;
reg = FIELD_GET(GICD_IIDR_REVISION_MASK, reg);
switch (reg) {
case KVM_VGIC_IMP_REV_2:
case KVM_VGIC_IMP_REV_3:
dist->implementation_rev = reg;
return 0;
default:
return -EINVAL;
}
case GICD_CTLR:
/* Not a GICv4.1? No HW SGIs */
if (!kvm_vgic_global_state.has_gicv4_1)
@ -221,34 +235,58 @@ static void vgic_mmio_write_irouter(struct kvm_vcpu *vcpu,
vgic_put_irq(vcpu->kvm, irq);
}
bool vgic_lpis_enabled(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
return atomic_read(&vgic_cpu->ctlr) == GICR_CTLR_ENABLE_LPIS;
}
static unsigned long vgic_mmio_read_v3r_ctlr(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
unsigned long val;
return vgic_cpu->lpis_enabled ? GICR_CTLR_ENABLE_LPIS : 0;
val = atomic_read(&vgic_cpu->ctlr);
if (vgic_get_implementation_rev(vcpu) >= KVM_VGIC_IMP_REV_3)
val |= GICR_CTLR_IR | GICR_CTLR_CES;
return val;
}
static void vgic_mmio_write_v3r_ctlr(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
bool was_enabled = vgic_cpu->lpis_enabled;
u32 ctlr;
if (!vgic_has_its(vcpu->kvm))
return;
vgic_cpu->lpis_enabled = val & GICR_CTLR_ENABLE_LPIS;
if (!(val & GICR_CTLR_ENABLE_LPIS)) {
/*
* Don't disable if RWP is set, as there already an
* ongoing disable. Funky guest...
*/
ctlr = atomic_cmpxchg_acquire(&vgic_cpu->ctlr,
GICR_CTLR_ENABLE_LPIS,
GICR_CTLR_RWP);
if (ctlr != GICR_CTLR_ENABLE_LPIS)
return;
if (was_enabled && !vgic_cpu->lpis_enabled) {
vgic_flush_pending_lpis(vcpu);
vgic_its_invalidate_cache(vcpu->kvm);
}
atomic_set_release(&vgic_cpu->ctlr, 0);
} else {
ctlr = atomic_cmpxchg_acquire(&vgic_cpu->ctlr, 0,
GICR_CTLR_ENABLE_LPIS);
if (ctlr != 0)
return;
if (!was_enabled && vgic_cpu->lpis_enabled)
vgic_enable_lpis(vcpu);
}
}
static bool vgic_mmio_vcpu_rdist_is_last(struct kvm_vcpu *vcpu)
@ -478,11 +516,10 @@ static void vgic_mmio_write_propbase(struct kvm_vcpu *vcpu,
unsigned long val)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
u64 old_propbaser, propbaser;
/* Storing a value with LPIs already enabled is undefined */
if (vgic_cpu->lpis_enabled)
if (vgic_lpis_enabled(vcpu))
return;
do {
@ -513,7 +550,7 @@ static void vgic_mmio_write_pendbase(struct kvm_vcpu *vcpu,
u64 old_pendbaser, pendbaser;
/* Storing a value with LPIs already enabled is undefined */
if (vgic_cpu->lpis_enabled)
if (vgic_lpis_enabled(vcpu))
return;
do {
@ -525,6 +562,63 @@ static void vgic_mmio_write_pendbase(struct kvm_vcpu *vcpu,
pendbaser) != old_pendbaser);
}
static unsigned long vgic_mmio_read_sync(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
return !!atomic_read(&vcpu->arch.vgic_cpu.syncr_busy);
}
static void vgic_set_rdist_busy(struct kvm_vcpu *vcpu, bool busy)
{
if (busy) {
atomic_inc(&vcpu->arch.vgic_cpu.syncr_busy);
smp_mb__after_atomic();
} else {
smp_mb__before_atomic();
atomic_dec(&vcpu->arch.vgic_cpu.syncr_busy);
}
}
static void vgic_mmio_write_invlpi(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
struct vgic_irq *irq;
/*
* If the guest wrote only to the upper 32bit part of the
* register, drop the write on the floor, as it is only for
* vPEs (which we don't support for obvious reasons).
*
* Also discard the access if LPIs are not enabled.
*/
if ((addr & 4) || !vgic_lpis_enabled(vcpu))
return;
vgic_set_rdist_busy(vcpu, true);
irq = vgic_get_irq(vcpu->kvm, NULL, lower_32_bits(val));
if (irq) {
vgic_its_inv_lpi(vcpu->kvm, irq);
vgic_put_irq(vcpu->kvm, irq);
}
vgic_set_rdist_busy(vcpu, false);
}
static void vgic_mmio_write_invall(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
/* See vgic_mmio_write_invlpi() for the early return rationale */
if ((addr & 4) || !vgic_lpis_enabled(vcpu))
return;
vgic_set_rdist_busy(vcpu, true);
vgic_its_invall(vcpu);
vgic_set_rdist_busy(vcpu, false);
}
/*
* The GICv3 per-IRQ registers are split to control PPIs and SGIs in the
* redistributors, while SPIs are covered by registers in the distributor
@ -630,6 +724,15 @@ static const struct vgic_register_region vgic_v3_rd_registers[] = {
REGISTER_DESC_WITH_LENGTH(GICR_PENDBASER,
vgic_mmio_read_pendbase, vgic_mmio_write_pendbase, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_INVLPIR,
vgic_mmio_read_raz, vgic_mmio_write_invlpi, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_INVALLR,
vgic_mmio_read_raz, vgic_mmio_write_invall, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_SYNCR,
vgic_mmio_read_sync, vgic_mmio_write_wi, 4,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_LENGTH(GICR_IDREGS,
vgic_mmio_read_v3_idregs, vgic_mmio_write_wi, 48,
VGIC_ACCESS_32bit),

4
arch/arm64/kvm/vgic/vgic-v3.c
View File

@ -612,6 +612,10 @@ early_param("kvm-arm.vgic_v4_enable", early_gicv4_enable);
static const struct midr_range broken_seis[] = {
MIDR_ALL_VERSIONS(MIDR_APPLE_M1_ICESTORM),
MIDR_ALL_VERSIONS(MIDR_APPLE_M1_FIRESTORM),
MIDR_ALL_VERSIONS(MIDR_APPLE_M1_ICESTORM_PRO),
MIDR_ALL_VERSIONS(MIDR_APPLE_M1_FIRESTORM_PRO),
MIDR_ALL_VERSIONS(MIDR_APPLE_M1_ICESTORM_MAX),
MIDR_ALL_VERSIONS(MIDR_APPLE_M1_FIRESTORM_MAX),
{},
};

10
arch/arm64/kvm/vgic/vgic.h
View File

@ -98,6 +98,11 @@
#define DEBUG_SPINLOCK_BUG_ON(p)
#endif
static inline u32 vgic_get_implementation_rev(struct kvm_vcpu *vcpu)
{
return vcpu->kvm->arch.vgic.implementation_rev;
}
/* Requires the irq_lock to be held by the caller. */
static inline bool irq_is_pending(struct vgic_irq *irq)
{
@ -308,6 +313,7 @@ static inline bool vgic_dist_overlap(struct kvm *kvm, gpa_t base, size_t size)
(base < d->vgic_dist_base + KVM_VGIC_V3_DIST_SIZE);
}
bool vgic_lpis_enabled(struct kvm_vcpu *vcpu);
int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr);
int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
u32 devid, u32 eventid, struct vgic_irq **irq);
@ -317,6 +323,10 @@ void vgic_lpi_translation_cache_init(struct kvm *kvm);
void vgic_lpi_translation_cache_destroy(struct kvm *kvm);
void vgic_its_invalidate_cache(struct kvm *kvm);
/* GICv4.1 MMIO interface */
int vgic_its_inv_lpi(struct kvm *kvm, struct vgic_irq *irq);
int vgic_its_invall(struct kvm_vcpu *vcpu);
bool vgic_supports_direct_msis(struct kvm *kvm);
int vgic_v4_init(struct kvm *kvm);
void vgic_v4_teardown(struct kvm *kvm);

12
arch/arm64/lib/delay.c
View File

@ -27,7 +27,17 @@ void __delay(unsigned long cycles)
{
cycles_t start = get_cycles();
if (arch_timer_evtstrm_available()) {
if (cpus_have_const_cap(ARM64_HAS_WFXT)) {
u64 end = start + cycles;
/*
* Start with WFIT. If an interrupt makes us resume
* early, use a WFET loop to complete the delay.
*/
wfit(end);
while ((get_cycles() - start) < cycles)
wfet(end);
} else if (arch_timer_evtstrm_available()) {
const cycles_t timer_evt_period =
USECS_TO_CYCLES(ARCH_TIMER_EVT_STREAM_PERIOD_US);

1
arch/arm64/tools/cpucaps
View File

@ -38,6 +38,7 @@ HAS_STAGE2_FWB
HAS_SYSREG_GIC_CPUIF
HAS_TLB_RANGE
HAS_VIRT_HOST_EXTN
HAS_WFXT
HW_DBM
KVM_PROTECTED_MODE
MISMATCHED_CACHE_TYPE

1
arch/riscv/include/asm/csr.h
View File

@ -117,6 +117,7 @@
#define HGATP_MODE_SV32X4 _AC(1, UL)
#define HGATP_MODE_SV39X4 _AC(8, UL)
#define HGATP_MODE_SV48X4 _AC(9, UL)
#define HGATP_MODE_SV57X4 _AC(10, UL)
#define HGATP32_MODE_SHIFT 31
#define HGATP32_VMID_SHIFT 22

120
arch/riscv/include/asm/kvm_host.h
View File

@ -12,12 +12,12 @@
#include <linux/types.h>
#include <linux/kvm.h>
#include <linux/kvm_types.h>
#include <linux/spinlock.h>
#include <asm/csr.h>
#include <asm/kvm_vcpu_fp.h>
#include <asm/kvm_vcpu_timer.h>
#define KVM_MAX_VCPUS \
((HGATP_VMID_MASK >> HGATP_VMID_SHIFT) + 1)
#define KVM_MAX_VCPUS 1024
#define KVM_HALT_POLL_NS_DEFAULT 500000
@ -27,6 +27,31 @@
KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(1)
#define KVM_REQ_UPDATE_HGATP KVM_ARCH_REQ(2)
#define KVM_REQ_FENCE_I \
KVM_ARCH_REQ_FLAGS(3, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_HFENCE_GVMA_VMID_ALL KVM_REQ_TLB_FLUSH
#define KVM_REQ_HFENCE_VVMA_ALL \
KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_HFENCE \
KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
enum kvm_riscv_hfence_type {
KVM_RISCV_HFENCE_UNKNOWN = 0,
KVM_RISCV_HFENCE_GVMA_VMID_GPA,
KVM_RISCV_HFENCE_VVMA_ASID_GVA,
KVM_RISCV_HFENCE_VVMA_ASID_ALL,
KVM_RISCV_HFENCE_VVMA_GVA,
};
struct kvm_riscv_hfence {
enum kvm_riscv_hfence_type type;
unsigned long asid;
unsigned long order;
gpa_t addr;
gpa_t size;
};
#define KVM_RISCV_VCPU_MAX_HFENCE 64
struct kvm_vm_stat {
struct kvm_vm_stat_generic generic;
@ -54,10 +79,10 @@ struct kvm_vmid {
};
struct kvm_arch {
/* stage2 vmid */
/* G-stage vmid */
struct kvm_vmid vmid;
/* stage2 page table */
/* G-stage page table */
pgd_t *pgd;
phys_addr_t pgd_phys;
@ -141,6 +166,9 @@ struct kvm_vcpu_arch {
/* VCPU ran at least once */
bool ran_atleast_once;
/* Last Host CPU on which Guest VCPU exited */
int last_exit_cpu;
/* ISA feature bits (similar to MISA) */
unsigned long isa;
@ -179,6 +207,12 @@ struct kvm_vcpu_arch {
/* VCPU Timer */
struct kvm_vcpu_timer timer;
/* HFENCE request queue */
spinlock_t hfence_lock;
unsigned long hfence_head;
unsigned long hfence_tail;
struct kvm_riscv_hfence hfence_queue[KVM_RISCV_VCPU_MAX_HFENCE];
/* MMIO instruction details */
struct kvm_mmio_decode mmio_decode;
@ -201,27 +235,71 @@ static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
#define KVM_ARCH_WANT_MMU_NOTIFIER
void __kvm_riscv_hfence_gvma_vmid_gpa(unsigned long gpa_divby_4,
unsigned long vmid);
void __kvm_riscv_hfence_gvma_vmid(unsigned long vmid);
void __kvm_riscv_hfence_gvma_gpa(unsigned long gpa_divby_4);
void __kvm_riscv_hfence_gvma_all(void);
#define KVM_RISCV_GSTAGE_TLB_MIN_ORDER 12
int kvm_riscv_stage2_map(struct kvm_vcpu *vcpu,
void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid,
gpa_t gpa, gpa_t gpsz,
unsigned long order);
void kvm_riscv_local_hfence_gvma_vmid_all(unsigned long vmid);
void kvm_riscv_local_hfence_gvma_gpa(gpa_t gpa, gpa_t gpsz,
unsigned long order);
void kvm_riscv_local_hfence_gvma_all(void);
void kvm_riscv_local_hfence_vvma_asid_gva(unsigned long vmid,
unsigned long asid,
unsigned long gva,
unsigned long gvsz,
unsigned long order);
void kvm_riscv_local_hfence_vvma_asid_all(unsigned long vmid,
unsigned long asid);
void kvm_riscv_local_hfence_vvma_gva(unsigned long vmid,
unsigned long gva, unsigned long gvsz,
unsigned long order);
void kvm_riscv_local_hfence_vvma_all(unsigned long vmid);
void kvm_riscv_local_tlb_sanitize(struct kvm_vcpu *vcpu);
void kvm_riscv_fence_i_process(struct kvm_vcpu *vcpu);
void kvm_riscv_hfence_gvma_vmid_all_process(struct kvm_vcpu *vcpu);
void kvm_riscv_hfence_vvma_all_process(struct kvm_vcpu *vcpu);
void kvm_riscv_hfence_process(struct kvm_vcpu *vcpu);
void kvm_riscv_fence_i(struct kvm *kvm,
unsigned long hbase, unsigned long hmask);
void kvm_riscv_hfence_gvma_vmid_gpa(struct kvm *kvm,
unsigned long hbase, unsigned long hmask,
gpa_t gpa, gpa_t gpsz,
unsigned long order);
void kvm_riscv_hfence_gvma_vmid_all(struct kvm *kvm,
unsigned long hbase, unsigned long hmask);
void kvm_riscv_hfence_vvma_asid_gva(struct kvm *kvm,
unsigned long hbase, unsigned long hmask,
unsigned long gva, unsigned long gvsz,
unsigned long order, unsigned long asid);
void kvm_riscv_hfence_vvma_asid_all(struct kvm *kvm,
unsigned long hbase, unsigned long hmask,
unsigned long asid);
void kvm_riscv_hfence_vvma_gva(struct kvm *kvm,
unsigned long hbase, unsigned long hmask,
unsigned long gva, unsigned long gvsz,
unsigned long order);
void kvm_riscv_hfence_vvma_all(struct kvm *kvm,
unsigned long hbase, unsigned long hmask);
int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
struct kvm_memory_slot *memslot,
gpa_t gpa, unsigned long hva, bool is_write);
int kvm_riscv_stage2_alloc_pgd(struct kvm *kvm);
void kvm_riscv_stage2_free_pgd(struct kvm *kvm);
void kvm_riscv_stage2_update_hgatp(struct kvm_vcpu *vcpu);
void kvm_riscv_stage2_mode_detect(void);
unsigned long kvm_riscv_stage2_mode(void);
int kvm_riscv_stage2_gpa_bits(void);
int kvm_riscv_gstage_alloc_pgd(struct kvm *kvm);
void kvm_riscv_gstage_free_pgd(struct kvm *kvm);
void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu);
void kvm_riscv_gstage_mode_detect(void);
unsigned long kvm_riscv_gstage_mode(void);
int kvm_riscv_gstage_gpa_bits(void);
void kvm_riscv_stage2_vmid_detect(void);
unsigned long kvm_riscv_stage2_vmid_bits(void);
int kvm_riscv_stage2_vmid_init(struct kvm *kvm);
bool kvm_riscv_stage2_vmid_ver_changed(struct kvm_vmid *vmid);
void kvm_riscv_stage2_vmid_update(struct kvm_vcpu *vcpu);
void kvm_riscv_gstage_vmid_detect(void);
unsigned long kvm_riscv_gstage_vmid_bits(void);
int kvm_riscv_gstage_vmid_init(struct kvm *kvm);
bool kvm_riscv_gstage_vmid_ver_changed(struct kvm_vmid *vmid);
void kvm_riscv_gstage_vmid_update(struct kvm_vcpu *vcpu);
void __kvm_riscv_unpriv_trap(void);

20
arch/riscv/include/uapi/asm/kvm.h
View File

@ -82,6 +82,23 @@ struct kvm_riscv_timer {
__u64 state;
};
/*
* ISA extension IDs specific to KVM. This is not the same as the host ISA
* extension IDs as that is internal to the host and should not be exposed
* to the guest. This should always be contiguous to keep the mapping simple
* in KVM implementation.
*/
enum KVM_RISCV_ISA_EXT_ID {
KVM_RISCV_ISA_EXT_A = 0,
KVM_RISCV_ISA_EXT_C,
KVM_RISCV_ISA_EXT_D,
KVM_RISCV_ISA_EXT_F,
KVM_RISCV_ISA_EXT_H,
KVM_RISCV_ISA_EXT_I,
KVM_RISCV_ISA_EXT_M,
KVM_RISCV_ISA_EXT_MAX,
};
/* Possible states for kvm_riscv_timer */
#define KVM_RISCV_TIMER_STATE_OFF 0
#define KVM_RISCV_TIMER_STATE_ON 1
@ -123,6 +140,9 @@ struct kvm_riscv_timer {
#define KVM_REG_RISCV_FP_D_REG(name) \
(offsetof(struct __riscv_d_ext_state, name) / sizeof(__u64))
/* ISA Extension registers are mapped as type 7 */
#define KVM_REG_RISCV_ISA_EXT (0x07 << KVM_REG_RISCV_TYPE_SHIFT)
#endif
#endif /* __LINUX_KVM_RISCV_H */

11
arch/riscv/kvm/main.c
View File

@ -89,13 +89,13 @@ int kvm_arch_init(void *opaque)
return -ENODEV;
}
kvm_riscv_stage2_mode_detect();
kvm_riscv_gstage_mode_detect();
kvm_riscv_stage2_vmid_detect();
kvm_riscv_gstage_vmid_detect();
kvm_info("hypervisor extension available\n");
switch (kvm_riscv_stage2_mode()) {
switch (kvm_riscv_gstage_mode()) {
case HGATP_MODE_SV32X4:
str = "Sv32x4";
break;
@ -105,12 +105,15 @@ int kvm_arch_init(void *opaque)
case HGATP_MODE_SV48X4:
str = "Sv48x4";
break;
case HGATP_MODE_SV57X4:
str = "Sv57x4";
break;
default:
return -ENODEV;
}
kvm_info("using %s G-stage page table format\n", str);
kvm_info("VMID %ld bits available\n", kvm_riscv_stage2_vmid_bits());
kvm_info("VMID %ld bits available\n", kvm_riscv_gstage_vmid_bits());
return 0;
}

266
arch/riscv/kvm/mmu.c
View File

@ -18,53 +18,52 @@
#include <asm/csr.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/sbi.h>
#ifdef CONFIG_64BIT
static unsigned long stage2_mode = (HGATP_MODE_SV39X4 << HGATP_MODE_SHIFT);
static unsigned long stage2_pgd_levels = 3;
#define stage2_index_bits 9
static unsigned long gstage_mode = (HGATP_MODE_SV39X4 << HGATP_MODE_SHIFT);
static unsigned long gstage_pgd_levels = 3;
#define gstage_index_bits 9
#else
static unsigned long stage2_mode = (HGATP_MODE_SV32X4 << HGATP_MODE_SHIFT);
static unsigned long stage2_pgd_levels = 2;
#define stage2_index_bits 10
static unsigned long gstage_mode = (HGATP_MODE_SV32X4 << HGATP_MODE_SHIFT);
static unsigned long gstage_pgd_levels = 2;
#define gstage_index_bits 10
#endif
#define stage2_pgd_xbits 2
#define stage2_pgd_size (1UL << (HGATP_PAGE_SHIFT + stage2_pgd_xbits))
#define stage2_gpa_bits (HGATP_PAGE_SHIFT + \
(stage2_pgd_levels * stage2_index_bits) + \
stage2_pgd_xbits)
#define stage2_gpa_size ((gpa_t)(1ULL << stage2_gpa_bits))
#define gstage_pgd_xbits 2
#define gstage_pgd_size (1UL << (HGATP_PAGE_SHIFT + gstage_pgd_xbits))
#define gstage_gpa_bits (HGATP_PAGE_SHIFT + \
(gstage_pgd_levels * gstage_index_bits) + \
gstage_pgd_xbits)
#define gstage_gpa_size ((gpa_t)(1ULL << gstage_gpa_bits))
#define stage2_pte_leaf(__ptep) \
#define gstage_pte_leaf(__ptep) \
(pte_val(*(__ptep)) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC))
static inline unsigned long stage2_pte_index(gpa_t addr, u32 level)
static inline unsigned long gstage_pte_index(gpa_t addr, u32 level)
{
unsigned long mask;
unsigned long shift = HGATP_PAGE_SHIFT + (stage2_index_bits * level);
unsigned long shift = HGATP_PAGE_SHIFT + (gstage_index_bits * level);
if (level == (stage2_pgd_levels - 1))
mask = (PTRS_PER_PTE * (1UL << stage2_pgd_xbits)) - 1;
if (level == (gstage_pgd_levels - 1))
mask = (PTRS_PER_PTE * (1UL << gstage_pgd_xbits)) - 1;
else
mask = PTRS_PER_PTE - 1;
return (addr >> shift) & mask;
}
static inline unsigned long stage2_pte_page_vaddr(pte_t pte)
static inline unsigned long gstage_pte_page_vaddr(pte_t pte)
{
return (unsigned long)pfn_to_virt(pte_val(pte) >> _PAGE_PFN_SHIFT);
}
static int stage2_page_size_to_level(unsigned long page_size, u32 *out_level)
static int gstage_page_size_to_level(unsigned long page_size, u32 *out_level)
{
u32 i;
unsigned long psz = 1UL << 12;
for (i = 0; i < stage2_pgd_levels; i++) {
if (page_size == (psz << (i * stage2_index_bits))) {
for (i = 0; i < gstage_pgd_levels; i++) {
if (page_size == (psz << (i * gstage_index_bits))) {
*out_level = i;
return 0;
}
@ -73,27 +72,39 @@ static int stage2_page_size_to_level(unsigned long page_size, u32 *out_level)
return -EINVAL;
}
static int stage2_level_to_page_size(u32 level, unsigned long *out_pgsize)
static int gstage_level_to_page_order(u32 level, unsigned long *out_pgorder)
{
if (stage2_pgd_levels < level)
if (gstage_pgd_levels < level)
return -EINVAL;
*out_pgsize = 1UL << (12 + (level * stage2_index_bits));
*out_pgorder = 12 + (level * gstage_index_bits);
return 0;
}
static bool stage2_get_leaf_entry(struct kvm *kvm, gpa_t addr,
static int gstage_level_to_page_size(u32 level, unsigned long *out_pgsize)
{
int rc;
unsigned long page_order = PAGE_SHIFT;
rc = gstage_level_to_page_order(level, &page_order);
if (rc)
return rc;
*out_pgsize = BIT(page_order);
return 0;
}
static bool gstage_get_leaf_entry(struct kvm *kvm, gpa_t addr,
pte_t **ptepp, u32 *ptep_level)
{
pte_t *ptep;
u32 current_level = stage2_pgd_levels - 1;
u32 current_level = gstage_pgd_levels - 1;
*ptep_level = current_level;
ptep = (pte_t *)kvm->arch.pgd;
ptep = &ptep[stage2_pte_index(addr, current_level)];
ptep = &ptep[gstage_pte_index(addr, current_level)];
while (ptep && pte_val(*ptep)) {
if (stage2_pte_leaf(ptep)) {
if (gstage_pte_leaf(ptep)) {
*ptep_level = current_level;
*ptepp = ptep;
return true;
@ -102,8 +113,8 @@ static bool stage2_get_leaf_entry(struct kvm *kvm, gpa_t addr,
if (current_level) {
current_level--;
*ptep_level = current_level;
ptep = (pte_t *)stage2_pte_page_vaddr(*ptep);
ptep = &ptep[stage2_pte_index(addr, current_level)];
ptep = (pte_t *)gstage_pte_page_vaddr(*ptep);
ptep = &ptep[gstage_pte_index(addr, current_level)];
} else {
ptep = NULL;
}
@ -112,38 +123,30 @@ static bool stage2_get_leaf_entry(struct kvm *kvm, gpa_t addr,
return false;
}
static void stage2_remote_tlb_flush(struct kvm *kvm, u32 level, gpa_t addr)
static void gstage_remote_tlb_flush(struct kvm *kvm, u32 level, gpa_t addr)
{
unsigned long size = PAGE_SIZE;
struct kvm_vmid *vmid = &kvm->arch.vmid;
unsigned long order = PAGE_SHIFT;
if (stage2_level_to_page_size(level, &size))
if (gstage_level_to_page_order(level, &order))
return;
addr &= ~(size - 1);
addr &= ~(BIT(order) - 1);
/*
* TODO: Instead of cpu_online_mask, we should only target CPUs
* where the Guest/VM is running.
*/
preempt_disable();
sbi_remote_hfence_gvma_vmid(cpu_online_mask, addr, size,
READ_ONCE(vmid->vmid));
preempt_enable();
kvm_riscv_hfence_gvma_vmid_gpa(kvm, -1UL, 0, addr, BIT(order), order);
}
static int stage2_set_pte(struct kvm *kvm, u32 level,
static int gstage_set_pte(struct kvm *kvm, u32 level,
struct kvm_mmu_memory_cache *pcache,
gpa_t addr, const pte_t *new_pte)
{
u32 current_level = stage2_pgd_levels - 1;
u32 current_level = gstage_pgd_levels - 1;
pte_t *next_ptep = (pte_t *)kvm->arch.pgd;
pte_t *ptep = &next_ptep[stage2_pte_index(addr, current_level)];
pte_t *ptep = &next_ptep[gstage_pte_index(addr, current_level)];
if (current_level < level)
return -EINVAL;
while (current_level != level) {
if (stage2_pte_leaf(ptep))
if (gstage_pte_leaf(ptep))
return -EEXIST;
if (!pte_val(*ptep)) {
@ -155,23 +158,23 @@ static int stage2_set_pte(struct kvm *kvm, u32 level,
*ptep = pfn_pte(PFN_DOWN(__pa(next_ptep)),
__pgprot(_PAGE_TABLE));
} else {
if (stage2_pte_leaf(ptep))
if (gstage_pte_leaf(ptep))
return -EEXIST;
next_ptep = (pte_t *)stage2_pte_page_vaddr(*ptep);
next_ptep = (pte_t *)gstage_pte_page_vaddr(*ptep);
}
current_level--;
ptep = &next_ptep[stage2_pte_index(addr, current_level)];
ptep = &next_ptep[gstage_pte_index(addr, current_level)];
}
*ptep = *new_pte;
if (stage2_pte_leaf(ptep))
stage2_remote_tlb_flush(kvm, current_level, addr);
if (gstage_pte_leaf(ptep))
gstage_remote_tlb_flush(kvm, current_level, addr);
return 0;
}
static int stage2_map_page(struct kvm *kvm,
static int gstage_map_page(struct kvm *kvm,
struct kvm_mmu_memory_cache *pcache,
gpa_t gpa, phys_addr_t hpa,
unsigned long page_size,
@ -182,7 +185,7 @@ static int stage2_map_page(struct kvm *kvm,
pte_t new_pte;
pgprot_t prot;
ret = stage2_page_size_to_level(page_size, &level);
ret = gstage_page_size_to_level(page_size, &level);
if (ret)
return ret;
@ -193,9 +196,9 @@ static int stage2_map_page(struct kvm *kvm,
* PTE so that software can update these bits.
*
* We support both options mentioned above. To achieve this, we
* always set 'A' and 'D' PTE bits at time of creating stage2
* always set 'A' and 'D' PTE bits at time of creating G-stage
* mapping. To support KVM dirty page logging with both options
* mentioned above, we will write-protect stage2 PTEs to track
* mentioned above, we will write-protect G-stage PTEs to track
* dirty pages.
*/
@ -213,24 +216,24 @@ static int stage2_map_page(struct kvm *kvm,
new_pte = pfn_pte(PFN_DOWN(hpa), prot);
new_pte = pte_mkdirty(new_pte);
return stage2_set_pte(kvm, level, pcache, gpa, &new_pte);
return gstage_set_pte(kvm, level, pcache, gpa, &new_pte);
}
enum stage2_op {
STAGE2_OP_NOP = 0, /* Nothing */
STAGE2_OP_CLEAR, /* Clear/Unmap */
STAGE2_OP_WP, /* Write-protect */
enum gstage_op {
GSTAGE_OP_NOP = 0, /* Nothing */
GSTAGE_OP_CLEAR, /* Clear/Unmap */
GSTAGE_OP_WP, /* Write-protect */
};
static void stage2_op_pte(struct kvm *kvm, gpa_t addr,
pte_t *ptep, u32 ptep_level, enum stage2_op op)
static void gstage_op_pte(struct kvm *kvm, gpa_t addr,
pte_t *ptep, u32 ptep_level, enum gstage_op op)
{
int i, ret;
pte_t *next_ptep;
u32 next_ptep_level;
unsigned long next_page_size, page_size;
ret = stage2_level_to_page_size(ptep_level, &page_size);
ret = gstage_level_to_page_size(ptep_level, &page_size);
if (ret)
return;
@ -239,31 +242,31 @@ static void stage2_op_pte(struct kvm *kvm, gpa_t addr,
if (!pte_val(*ptep))
return;
if (ptep_level && !stage2_pte_leaf(ptep)) {
next_ptep = (pte_t *)stage2_pte_page_vaddr(*ptep);
if (ptep_level && !gstage_pte_leaf(ptep)) {
next_ptep = (pte_t *)gstage_pte_page_vaddr(*ptep);
next_ptep_level = ptep_level - 1;
ret = stage2_level_to_page_size(next_ptep_level,
ret = gstage_level_to_page_size(next_ptep_level,
&next_page_size);
if (ret)
return;
if (op == STAGE2_OP_CLEAR)
if (op == GSTAGE_OP_CLEAR)
set_pte(ptep, __pte(0));
for (i = 0; i < PTRS_PER_PTE; i++)
stage2_op_pte(kvm, addr + i * next_page_size,
gstage_op_pte(kvm, addr + i * next_page_size,
&next_ptep[i], next_ptep_level, op);
if (op == STAGE2_OP_CLEAR)
if (op == GSTAGE_OP_CLEAR)
put_page(virt_to_page(next_ptep));
} else {
if (op == STAGE2_OP_CLEAR)
if (op == GSTAGE_OP_CLEAR)
set_pte(ptep, __pte(0));
else if (op == STAGE2_OP_WP)
else if (op == GSTAGE_OP_WP)
set_pte(ptep, __pte(pte_val(*ptep) & ~_PAGE_WRITE));
stage2_remote_tlb_flush(kvm, ptep_level, addr);
gstage_remote_tlb_flush(kvm, ptep_level, addr);
}
}
static void stage2_unmap_range(struct kvm *kvm, gpa_t start,
static void gstage_unmap_range(struct kvm *kvm, gpa_t start,
gpa_t size, bool may_block)
{
int ret;
@ -274,9 +277,9 @@ static void stage2_unmap_range(struct kvm *kvm, gpa_t start,
gpa_t addr = start, end = start + size;
while (addr < end) {
found_leaf = stage2_get_leaf_entry(kvm, addr,
found_leaf = gstage_get_leaf_entry(kvm, addr,
&ptep, &ptep_level);
ret = stage2_level_to_page_size(ptep_level, &page_size);
ret = gstage_level_to_page_size(ptep_level, &page_size);
if (ret)
break;
@ -284,8 +287,8 @@ static void stage2_unmap_range(struct kvm *kvm, gpa_t start,
goto next;
if (!(addr & (page_size - 1)) && ((end - addr) >= page_size))
stage2_op_pte(kvm, addr, ptep,
ptep_level, STAGE2_OP_CLEAR);
gstage_op_pte(kvm, addr, ptep,
ptep_level, GSTAGE_OP_CLEAR);
next:
addr += page_size;
@ -299,7 +302,7 @@ next:
}
}
static void stage2_wp_range(struct kvm *kvm, gpa_t start, gpa_t end)
static void gstage_wp_range(struct kvm *kvm, gpa_t start, gpa_t end)
{
int ret;
pte_t *ptep;
@ -309,9 +312,9 @@ static void stage2_wp_range(struct kvm *kvm, gpa_t start, gpa_t end)
unsigned long page_size;
while (addr < end) {
found_leaf = stage2_get_leaf_entry(kvm, addr,
found_leaf = gstage_get_leaf_entry(kvm, addr,
&ptep, &ptep_level);
ret = stage2_level_to_page_size(ptep_level, &page_size);
ret = gstage_level_to_page_size(ptep_level, &page_size);
if (ret)
break;
@ -319,15 +322,15 @@ static void stage2_wp_range(struct kvm *kvm, gpa_t start, gpa_t end)
goto next;
if (!(addr & (page_size - 1)) && ((end - addr) >= page_size))
stage2_op_pte(kvm, addr, ptep,
ptep_level, STAGE2_OP_WP);
gstage_op_pte(kvm, addr, ptep,
ptep_level, GSTAGE_OP_WP);
next:
addr += page_size;
}
}
static void stage2_wp_memory_region(struct kvm *kvm, int slot)
static void gstage_wp_memory_region(struct kvm *kvm, int slot)
{
struct kvm_memslots *slots = kvm_memslots(kvm);
struct kvm_memory_slot *memslot = id_to_memslot(slots, slot);
@ -335,12 +338,12 @@ static void stage2_wp_memory_region(struct kvm *kvm, int slot)
phys_addr_t end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT;
spin_lock(&kvm->mmu_lock);
stage2_wp_range(kvm, start, end);
gstage_wp_range(kvm, start, end);
spin_unlock(&kvm->mmu_lock);
kvm_flush_remote_tlbs(kvm);
}
static int stage2_ioremap(struct kvm *kvm, gpa_t gpa, phys_addr_t hpa,
static int gstage_ioremap(struct kvm *kvm, gpa_t gpa, phys_addr_t hpa,
unsigned long size, bool writable)
{
pte_t pte;
@ -361,12 +364,12 @@ static int stage2_ioremap(struct kvm *kvm, gpa_t gpa, phys_addr_t hpa,
if (!writable)
pte = pte_wrprotect(pte);
ret = kvm_mmu_topup_memory_cache(&pcache, stage2_pgd_levels);
ret = kvm_mmu_topup_memory_cache(&pcache, gstage_pgd_levels);
if (ret)
goto out;
spin_lock(&kvm->mmu_lock);
ret = stage2_set_pte(kvm, 0, &pcache, addr, &pte);
ret = gstage_set_pte(kvm, 0, &pcache, addr, &pte);
spin_unlock(&kvm->mmu_lock);
if (ret)
goto out;
@ -388,7 +391,7 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
phys_addr_t start = (base_gfn + __ffs(mask)) << PAGE_SHIFT;
phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT;
stage2_wp_range(kvm, start, end);
gstage_wp_range(kvm, start, end);
}
void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
@ -411,7 +414,7 @@ void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen)
void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
kvm_riscv_stage2_free_pgd(kvm);
kvm_riscv_gstage_free_pgd(kvm);
}
void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
@ -421,7 +424,7 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
phys_addr_t size = slot->npages << PAGE_SHIFT;
spin_lock(&kvm->mmu_lock);
stage2_unmap_range(kvm, gpa, size, false);
gstage_unmap_range(kvm, gpa, size, false);
spin_unlock(&kvm->mmu_lock);
}
@ -436,7 +439,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
* the memory slot is write protected.
*/
if (change != KVM_MR_DELETE && new->flags & KVM_MEM_LOG_DIRTY_PAGES)
stage2_wp_memory_region(kvm, new->id);
gstage_wp_memory_region(kvm, new->id);
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
@ -458,7 +461,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
* space addressable by the KVM guest GPA space.
*/
if ((new->base_gfn + new->npages) >=
(stage2_gpa_size >> PAGE_SHIFT))
(gstage_gpa_size >> PAGE_SHIFT))
return -EFAULT;
hva = new->userspace_addr;
@ -514,7 +517,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
goto out;
}
ret = stage2_ioremap(kvm, gpa, pa,
ret = gstage_ioremap(kvm, gpa, pa,
vm_end - vm_start, writable);
if (ret)
break;
@ -527,7 +530,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
spin_lock(&kvm->mmu_lock);
if (ret)
stage2_unmap_range(kvm, base_gpa, size, false);
gstage_unmap_range(kvm, base_gpa, size, false);
spin_unlock(&kvm->mmu_lock);
out:
@ -540,7 +543,7 @@ bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range)
if (!kvm->arch.pgd)
return false;
stage2_unmap_range(kvm, range->start << PAGE_SHIFT,
gstage_unmap_range(kvm, range->start << PAGE_SHIFT,
(range->end - range->start) << PAGE_SHIFT,
range->may_block);
return false;
@ -556,10 +559,10 @@ bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
WARN_ON(range->end - range->start != 1);
ret = stage2_map_page(kvm, NULL, range->start << PAGE_SHIFT,
ret = gstage_map_page(kvm, NULL, range->start << PAGE_SHIFT,
__pfn_to_phys(pfn), PAGE_SIZE, true, true);
if (ret) {
kvm_debug("Failed to map stage2 page (error %d)\n", ret);
kvm_debug("Failed to map G-stage page (error %d)\n", ret);
return true;
}
@ -577,7 +580,7 @@ bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PGDIR_SIZE);
if (!stage2_get_leaf_entry(kvm, range->start << PAGE_SHIFT,
if (!gstage_get_leaf_entry(kvm, range->start << PAGE_SHIFT,
&ptep, &ptep_level))
return false;
@ -595,14 +598,14 @@ bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PGDIR_SIZE);
if (!stage2_get_leaf_entry(kvm, range->start << PAGE_SHIFT,
if (!gstage_get_leaf_entry(kvm, range->start << PAGE_SHIFT,
&ptep, &ptep_level))
return false;
return pte_young(*ptep);
}
int kvm_riscv_stage2_map(struct kvm_vcpu *vcpu,
int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
struct kvm_memory_slot *memslot,
gpa_t gpa, unsigned long hva, bool is_write)
{
@ -648,9 +651,9 @@ int kvm_riscv_stage2_map(struct kvm_vcpu *vcpu,
}
/* We need minimum second+third level pages */
ret = kvm_mmu_topup_memory_cache(pcache, stage2_pgd_levels);
ret = kvm_mmu_topup_memory_cache(pcache, gstage_pgd_levels);
if (ret) {
kvm_err("Failed to topup stage2 cache\n");
kvm_err("Failed to topup G-stage cache\n");
return ret;
}
@ -680,15 +683,15 @@ int kvm_riscv_stage2_map(struct kvm_vcpu *vcpu,
if (writeable) {
kvm_set_pfn_dirty(hfn);
mark_page_dirty(kvm, gfn);
ret = stage2_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT,
ret = gstage_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT,
vma_pagesize, false, true);
} else {
ret = stage2_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT,
ret = gstage_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT,
vma_pagesize, true, true);
}
if (ret)
kvm_err("Failed to map in stage2\n");
kvm_err("Failed to map in G-stage\n");
out_unlock:
spin_unlock(&kvm->mmu_lock);
@ -697,7 +700,7 @@ out_unlock:
return ret;
}
int kvm_riscv_stage2_alloc_pgd(struct kvm *kvm)
int kvm_riscv_gstage_alloc_pgd(struct kvm *kvm)
{
struct page *pgd_page;
@ -707,7 +710,7 @@ int kvm_riscv_stage2_alloc_pgd(struct kvm *kvm)
}
pgd_page = alloc_pages(GFP_KERNEL | __GFP_ZERO,
get_order(stage2_pgd_size));
get_order(gstage_pgd_size));
if (!pgd_page)
return -ENOMEM;
kvm->arch.pgd = page_to_virt(pgd_page);
@ -716,13 +719,13 @@ int kvm_riscv_stage2_alloc_pgd(struct kvm *kvm)
return 0;
}
void kvm_riscv_stage2_free_pgd(struct kvm *kvm)
void kvm_riscv_gstage_free_pgd(struct kvm *kvm)
{
void *pgd = NULL;
spin_lock(&kvm->mmu_lock);
if (kvm->arch.pgd) {
stage2_unmap_range(kvm, 0UL, stage2_gpa_size, false);
gstage_unmap_range(kvm, 0UL, gstage_gpa_size, false);
pgd = READ_ONCE(kvm->arch.pgd);
kvm->arch.pgd = NULL;
kvm->arch.pgd_phys = 0;
@ -730,12 +733,12 @@ void kvm_riscv_stage2_free_pgd(struct kvm *kvm)
spin_unlock(&kvm->mmu_lock);
if (pgd)
free_pages((unsigned long)pgd, get_order(stage2_pgd_size));
free_pages((unsigned long)pgd, get_order(gstage_pgd_size));
}
void kvm_riscv_stage2_update_hgatp(struct kvm_vcpu *vcpu)
void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu)
{
unsigned long hgatp = stage2_mode;
unsigned long hgatp = gstage_mode;
struct kvm_arch *k = &vcpu->kvm->arch;
hgatp |= (READ_ONCE(k->vmid.vmid) << HGATP_VMID_SHIFT) &
@ -744,31 +747,40 @@ void kvm_riscv_stage2_update_hgatp(struct kvm_vcpu *vcpu)
csr_write(CSR_HGATP, hgatp);
if (!kvm_riscv_stage2_vmid_bits())
__kvm_riscv_hfence_gvma_all();
if (!kvm_riscv_gstage_vmid_bits())
kvm_riscv_local_hfence_gvma_all();
}
void kvm_riscv_stage2_mode_detect(void)
void kvm_riscv_gstage_mode_detect(void)
{
#ifdef CONFIG_64BIT
/* Try Sv48x4 stage2 mode */
/* Try Sv57x4 G-stage mode */
csr_write(CSR_HGATP, HGATP_MODE_SV57X4 << HGATP_MODE_SHIFT);
if ((csr_read(CSR_HGATP) >> HGATP_MODE_SHIFT) == HGATP_MODE_SV57X4) {
gstage_mode = (HGATP_MODE_SV57X4 << HGATP_MODE_SHIFT);
gstage_pgd_levels = 5;
goto skip_sv48x4_test;
}
/* Try Sv48x4 G-stage mode */
csr_write(CSR_HGATP, HGATP_MODE_SV48X4 << HGATP_MODE_SHIFT);
if ((csr_read(CSR_HGATP) >> HGATP_MODE_SHIFT) == HGATP_MODE_SV48X4) {
stage2_mode = (HGATP_MODE_SV48X4 << HGATP_MODE_SHIFT);
stage2_pgd_levels = 4;
gstage_mode = (HGATP_MODE_SV48X4 << HGATP_MODE_SHIFT);
gstage_pgd_levels = 4;
}
csr_write(CSR_HGATP, 0);
skip_sv48x4_test:
__kvm_riscv_hfence_gvma_all();
csr_write(CSR_HGATP, 0);
kvm_riscv_local_hfence_gvma_all();
#endif
}
unsigned long kvm_riscv_stage2_mode(void)
unsigned long kvm_riscv_gstage_mode(void)
{
return stage2_mode >> HGATP_MODE_SHIFT;
return gstage_mode >> HGATP_MODE_SHIFT;
}
int kvm_riscv_stage2_gpa_bits(void)
int kvm_riscv_gstage_gpa_bits(void)
{
return stage2_gpa_bits;
return gstage_gpa_bits;
}

74
arch/riscv/kvm/tlb.S
View File

@ -1,74 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/linkage.h>
#include <asm/asm.h>
.text
.altmacro
.option norelax
/*
* Instruction encoding of hfence.gvma is:
* HFENCE.GVMA rs1, rs2
* HFENCE.GVMA zero, rs2
* HFENCE.GVMA rs1
* HFENCE.GVMA
*
* rs1!=zero and rs2!=zero ==> HFENCE.GVMA rs1, rs2
* rs1==zero and rs2!=zero ==> HFENCE.GVMA zero, rs2
* rs1!=zero and rs2==zero ==> HFENCE.GVMA rs1
* rs1==zero and rs2==zero ==> HFENCE.GVMA
*
* Instruction encoding of HFENCE.GVMA is:
* 0110001 rs2(5) rs1(5) 000 00000 1110011
*/
ENTRY(__kvm_riscv_hfence_gvma_vmid_gpa)
/*
* rs1 = a0 (GPA >> 2)
* rs2 = a1 (VMID)
* HFENCE.GVMA a0, a1
* 0110001 01011 01010 000 00000 1110011
*/
.word 0x62b50073
ret
ENDPROC(__kvm_riscv_hfence_gvma_vmid_gpa)
ENTRY(__kvm_riscv_hfence_gvma_vmid)
/*
* rs1 = zero
* rs2 = a0 (VMID)
* HFENCE.GVMA zero, a0
* 0110001 01010 00000 000 00000 1110011
*/
.word 0x62a00073
ret
ENDPROC(__kvm_riscv_hfence_gvma_vmid)
ENTRY(__kvm_riscv_hfence_gvma_gpa)
/*
* rs1 = a0 (GPA >> 2)
* rs2 = zero
* HFENCE.GVMA a0
* 0110001 00000 01010 000 00000 1110011
*/
.word 0x62050073
ret
ENDPROC(__kvm_riscv_hfence_gvma_gpa)
ENTRY(__kvm_riscv_hfence_gvma_all)
/*
* rs1 = zero
* rs2 = zero
* HFENCE.GVMA
* 0110001 00000 00000 000 00000 1110011
*/
.word 0x62000073
ret
ENDPROC(__kvm_riscv_hfence_gvma_all)

461
arch/riscv/kvm/tlb.c Normal file
View File

@ -0,0 +1,461 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2022 Ventana Micro Systems Inc.
*/
#include <linux/bitmap.h>
#include <linux/cpumask.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/kvm_host.h>
#include <asm/cacheflush.h>
#include <asm/csr.h>
/*
* Instruction encoding of hfence.gvma is:
* HFENCE.GVMA rs1, rs2
* HFENCE.GVMA zero, rs2
* HFENCE.GVMA rs1
* HFENCE.GVMA
*
* rs1!=zero and rs2!=zero ==> HFENCE.GVMA rs1, rs2
* rs1==zero and rs2!=zero ==> HFENCE.GVMA zero, rs2
* rs1!=zero and rs2==zero ==> HFENCE.GVMA rs1
* rs1==zero and rs2==zero ==> HFENCE.GVMA
*
* Instruction encoding of HFENCE.GVMA is:
* 0110001 rs2(5) rs1(5) 000 00000 1110011
*/
void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid,
gpa_t gpa, gpa_t gpsz,
unsigned long order)
{
gpa_t pos;
if (PTRS_PER_PTE < (gpsz >> order)) {
kvm_riscv_local_hfence_gvma_vmid_all(vmid);
return;
}
for (pos = gpa; pos < (gpa + gpsz); pos += BIT(order)) {
/*
* rs1 = a0 (GPA >> 2)
* rs2 = a1 (VMID)
* HFENCE.GVMA a0, a1
* 0110001 01011 01010 000 00000 1110011
*/
asm volatile ("srli a0, %0, 2\n"
"add a1, %1, zero\n"
".word 0x62b50073\n"
:: "r" (pos), "r" (vmid)
: "a0", "a1", "memory");
}
}
void kvm_riscv_local_hfence_gvma_vmid_all(unsigned long vmid)
{
/*
* rs1 = zero
* rs2 = a0 (VMID)
* HFENCE.GVMA zero, a0
* 0110001 01010 00000 000 00000 1110011
*/
asm volatile ("add a0, %0, zero\n"
".word 0x62a00073\n"
:: "r" (vmid) : "a0", "memory");
}
void kvm_riscv_local_hfence_gvma_gpa(gpa_t gpa, gpa_t gpsz,
unsigned long order)
{
gpa_t pos;
if (PTRS_PER_PTE < (gpsz >> order)) {
kvm_riscv_local_hfence_gvma_all();
return;
}
for (pos = gpa; pos < (gpa + gpsz); pos += BIT(order)) {
/*
* rs1 = a0 (GPA >> 2)
* rs2 = zero
* HFENCE.GVMA a0
* 0110001 00000 01010 000 00000 1110011
*/
asm volatile ("srli a0, %0, 2\n"
".word 0x62050073\n"
:: "r" (pos) : "a0", "memory");
}
}
void kvm_riscv_local_hfence_gvma_all(void)
{
/*
* rs1 = zero
* rs2 = zero
* HFENCE.GVMA
* 0110001 00000 00000 000 00000 1110011
*/
asm volatile (".word 0x62000073" ::: "memory");
}
/*
* Instruction encoding of hfence.gvma is:
* HFENCE.VVMA rs1, rs2
* HFENCE.VVMA zero, rs2
* HFENCE.VVMA rs1
* HFENCE.VVMA
*
* rs1!=zero and rs2!=zero ==> HFENCE.VVMA rs1, rs2
* rs1==zero and rs2!=zero ==> HFENCE.VVMA zero, rs2
* rs1!=zero and rs2==zero ==> HFENCE.VVMA rs1
* rs1==zero and rs2==zero ==> HFENCE.VVMA
*
* Instruction encoding of HFENCE.VVMA is:
* 0010001 rs2(5) rs1(5) 000 00000 1110011
*/
void kvm_riscv_local_hfence_vvma_asid_gva(unsigned long vmid,
unsigned long asid,
unsigned long gva,
unsigned long gvsz,
unsigned long order)
{
unsigned long pos, hgatp;
if (PTRS_PER_PTE < (gvsz >> order)) {
kvm_riscv_local_hfence_vvma_asid_all(vmid, asid);
return;
}
hgatp = csr_swap(CSR_HGATP, vmid << HGATP_VMID_SHIFT);
for (pos = gva; pos < (gva + gvsz); pos += BIT(order)) {
/*
* rs1 = a0 (GVA)
* rs2 = a1 (ASID)
* HFENCE.VVMA a0, a1
* 0010001 01011 01010 000 00000 1110011
*/
asm volatile ("add a0, %0, zero\n"
"add a1, %1, zero\n"
".word 0x22b50073\n"
:: "r" (pos), "r" (asid)
: "a0", "a1", "memory");
}
csr_write(CSR_HGATP, hgatp);
}
void kvm_riscv_local_hfence_vvma_asid_all(unsigned long vmid,
unsigned long asid)
{
unsigned long hgatp;
hgatp = csr_swap(CSR_HGATP, vmid << HGATP_VMID_SHIFT);
/*
* rs1 = zero
* rs2 = a0 (ASID)
* HFENCE.VVMA zero, a0
* 0010001 01010 00000 000 00000 1110011
*/
asm volatile ("add a0, %0, zero\n"
".word 0x22a00073\n"
:: "r" (asid) : "a0", "memory");
csr_write(CSR_HGATP, hgatp);
}
void kvm_riscv_local_hfence_vvma_gva(unsigned long vmid,
unsigned long gva, unsigned long gvsz,
unsigned long order)
{
unsigned long pos, hgatp;
if (PTRS_PER_PTE < (gvsz >> order)) {
kvm_riscv_local_hfence_vvma_all(vmid);
return;
}
hgatp = csr_swap(CSR_HGATP, vmid << HGATP_VMID_SHIFT);
for (pos = gva; pos < (gva + gvsz); pos += BIT(order)) {
/*
* rs1 = a0 (GVA)
* rs2 = zero
* HFENCE.VVMA a0
* 0010001 00000 01010 000 00000 1110011
*/
asm volatile ("add a0, %0, zero\n"
".word 0x22050073\n"
:: "r" (pos) : "a0", "memory");
}
csr_write(CSR_HGATP, hgatp);
}
void kvm_riscv_local_hfence_vvma_all(unsigned long vmid)
{
unsigned long hgatp;
hgatp = csr_swap(CSR_HGATP, vmid << HGATP_VMID_SHIFT);
/*
* rs1 = zero
* rs2 = zero
* HFENCE.VVMA
* 0010001 00000 00000 000 00000 1110011
*/
asm volatile (".word 0x22000073" ::: "memory");
csr_write(CSR_HGATP, hgatp);
}
void kvm_riscv_local_tlb_sanitize(struct kvm_vcpu *vcpu)
{
unsigned long vmid;
if (!kvm_riscv_gstage_vmid_bits() ||
vcpu->arch.last_exit_cpu == vcpu->cpu)
return;
/*
* On RISC-V platforms with hardware VMID support, we share same
* VMID for all VCPUs of a particular Guest/VM. This means we might
* have stale G-stage TLB entries on the current Host CPU due to
* some other VCPU of the same Guest which ran previously on the
* current Host CPU.
*
* To cleanup stale TLB entries, we simply flush all G-stage TLB
* entries by VMID whenever underlying Host CPU changes for a VCPU.
*/
vmid = READ_ONCE(vcpu->kvm->arch.vmid.vmid);
kvm_riscv_local_hfence_gvma_vmid_all(vmid);
}
void kvm_riscv_fence_i_process(struct kvm_vcpu *vcpu)
{
local_flush_icache_all();
}
void kvm_riscv_hfence_gvma_vmid_all_process(struct kvm_vcpu *vcpu)
{
struct kvm_vmid *vmid;
vmid = &vcpu->kvm->arch.vmid;
kvm_riscv_local_hfence_gvma_vmid_all(READ_ONCE(vmid->vmid));
}
void kvm_riscv_hfence_vvma_all_process(struct kvm_vcpu *vcpu)
{
struct kvm_vmid *vmid;
vmid = &vcpu->kvm->arch.vmid;
kvm_riscv_local_hfence_vvma_all(READ_ONCE(vmid->vmid));
}
static bool vcpu_hfence_dequeue(struct kvm_vcpu *vcpu,
struct kvm_riscv_hfence *out_data)
{
bool ret = false;
struct kvm_vcpu_arch *varch = &vcpu->arch;
spin_lock(&varch->hfence_lock);
if (varch->hfence_queue[varch->hfence_head].type) {
memcpy(out_data, &varch->hfence_queue[varch->hfence_head],
sizeof(*out_data));
varch->hfence_queue[varch->hfence_head].type = 0;
varch->hfence_head++;
if (varch->hfence_head == KVM_RISCV_VCPU_MAX_HFENCE)
varch->hfence_head = 0;
ret = true;
}
spin_unlock(&varch->hfence_lock);
return ret;
}
static bool vcpu_hfence_enqueue(struct kvm_vcpu *vcpu,
const struct kvm_riscv_hfence *data)
{
bool ret = false;
struct kvm_vcpu_arch *varch = &vcpu->arch;
spin_lock(&varch->hfence_lock);
if (!varch->hfence_queue[varch->hfence_tail].type) {
memcpy(&varch->hfence_queue[varch->hfence_tail],
data, sizeof(*data));
varch->hfence_tail++;
if (varch->hfence_tail == KVM_RISCV_VCPU_MAX_HFENCE)
varch->hfence_tail = 0;
ret = true;
}
spin_unlock(&varch->hfence_lock);
return ret;
}
void kvm_riscv_hfence_process(struct kvm_vcpu *vcpu)
{
struct kvm_riscv_hfence d = { 0 };
struct kvm_vmid *v = &vcpu->kvm->arch.vmid;
while (vcpu_hfence_dequeue(vcpu, &d)) {
switch (d.type) {
case KVM_RISCV_HFENCE_UNKNOWN:
break;
case KVM_RISCV_HFENCE_GVMA_VMID_GPA:
kvm_riscv_local_hfence_gvma_vmid_gpa(
READ_ONCE(v->vmid),
d.addr, d.size, d.order);
break;
case KVM_RISCV_HFENCE_VVMA_ASID_GVA:
kvm_riscv_local_hfence_vvma_asid_gva(
READ_ONCE(v->vmid), d.asid,
d.addr, d.size, d.order);
break;
case KVM_RISCV_HFENCE_VVMA_ASID_ALL:
kvm_riscv_local_hfence_vvma_asid_all(
READ_ONCE(v->vmid), d.asid);
break;
case KVM_RISCV_HFENCE_VVMA_GVA:
kvm_riscv_local_hfence_vvma_gva(
READ_ONCE(v->vmid),
d.addr, d.size, d.order);
break;
default:
break;
}
}
}
static void make_xfence_request(struct kvm *kvm,
unsigned long hbase, unsigned long hmask,
unsigned int req, unsigned int fallback_req,
const struct kvm_riscv_hfence *data)
{
unsigned long i;
struct kvm_vcpu *vcpu;
unsigned int actual_req = req;
DECLARE_BITMAP(vcpu_mask, KVM_MAX_VCPUS);
bitmap_clear(vcpu_mask, 0, KVM_MAX_VCPUS);
kvm_for_each_vcpu(i, vcpu, kvm) {
if (hbase != -1UL) {
if (vcpu->vcpu_id < hbase)
continue;
if (!(hmask & (1UL << (vcpu->vcpu_id - hbase))))
continue;
}
bitmap_set(vcpu_mask, i, 1);
if (!data || !data->type)
continue;
/*
* Enqueue hfence data to VCPU hfence queue. If we don't
* have space in the VCPU hfence queue then fallback to
* a more conservative hfence request.
*/
if (!vcpu_hfence_enqueue(vcpu, data))
actual_req = fallback_req;
}
kvm_make_vcpus_request_mask(kvm, actual_req, vcpu_mask);
}
void kvm_riscv_fence_i(struct kvm *kvm,
unsigned long hbase, unsigned long hmask)
{
make_xfence_request(kvm, hbase, hmask, KVM_REQ_FENCE_I,
KVM_REQ_FENCE_I, NULL);
}
void kvm_riscv_hfence_gvma_vmid_gpa(struct kvm *kvm,
unsigned long hbase, unsigned long hmask,
gpa_t gpa, gpa_t gpsz,
unsigned long order)
{
struct kvm_riscv_hfence data;
data.type = KVM_RISCV_HFENCE_GVMA_VMID_GPA;
data.asid = 0;
data.addr = gpa;
data.size = gpsz;
data.order = order;
make_xfence_request(kvm, hbase, hmask, KVM_REQ_HFENCE,
KVM_REQ_HFENCE_GVMA_VMID_ALL, &data);
}
void kvm_riscv_hfence_gvma_vmid_all(struct kvm *kvm,
unsigned long hbase, unsigned long hmask)
{
make_xfence_request(kvm, hbase, hmask, KVM_REQ_HFENCE_GVMA_VMID_ALL,
KVM_REQ_HFENCE_GVMA_VMID_ALL, NULL);
}
void kvm_riscv_hfence_vvma_asid_gva(struct kvm *kvm,
unsigned long hbase, unsigned long hmask,
unsigned long gva, unsigned long gvsz,
unsigned long order, unsigned long asid)
{
struct kvm_riscv_hfence data;
data.type = KVM_RISCV_HFENCE_VVMA_ASID_GVA;
data.asid = asid;
data.addr = gva;
data.size = gvsz;
data.order = order;
make_xfence_request(kvm, hbase, hmask, KVM_REQ_HFENCE,
KVM_REQ_HFENCE_VVMA_ALL, &data);
}
void kvm_riscv_hfence_vvma_asid_all(struct kvm *kvm,
unsigned long hbase, unsigned long hmask,
unsigned long asid)
{
struct kvm_riscv_hfence data;
data.type = KVM_RISCV_HFENCE_VVMA_ASID_ALL;
data.asid = asid;
data.addr = data.size = data.order = 0;
make_xfence_request(kvm, hbase, hmask, KVM_REQ_HFENCE,
KVM_REQ_HFENCE_VVMA_ALL, &data);
}
void kvm_riscv_hfence_vvma_gva(struct kvm *kvm,
unsigned long hbase, unsigned long hmask,
unsigned long gva, unsigned long gvsz,
unsigned long order)
{
struct kvm_riscv_hfence data;
data.type = KVM_RISCV_HFENCE_VVMA_GVA;
data.asid = 0;
data.addr = gva;
data.size = gvsz;
data.order = order;
make_xfence_request(kvm, hbase, hmask, KVM_REQ_HFENCE,
KVM_REQ_HFENCE_VVMA_ALL, &data);
}
void kvm_riscv_hfence_vvma_all(struct kvm *kvm,
unsigned long hbase, unsigned long hmask)
{
make_xfence_request(kvm, hbase, hmask, KVM_REQ_HFENCE_VVMA_ALL,
KVM_REQ_HFENCE_VVMA_ALL, NULL);
}

144
arch/riscv/kvm/vcpu.c
View File

@ -67,6 +67,8 @@ static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
if (loaded)
kvm_arch_vcpu_put(vcpu);
vcpu->arch.last_exit_cpu = -1;
memcpy(csr, reset_csr, sizeof(*csr));
memcpy(cntx, reset_cntx, sizeof(*cntx));
@ -78,6 +80,10 @@ static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
WRITE_ONCE(vcpu->arch.irqs_pending, 0);
WRITE_ONCE(vcpu->arch.irqs_pending_mask, 0);
vcpu->arch.hfence_head = 0;
vcpu->arch.hfence_tail = 0;
memset(vcpu->arch.hfence_queue, 0, sizeof(vcpu->arch.hfence_queue));
/* Reset the guest CSRs for hotplug usecase */
if (loaded)
kvm_arch_vcpu_load(vcpu, smp_processor_id());
@ -101,6 +107,9 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
/* Setup ISA features available to VCPU */
vcpu->arch.isa = riscv_isa_extension_base(NULL) & KVM_RISCV_ISA_ALLOWED;
/* Setup VCPU hfence queue */
spin_lock_init(&vcpu->arch.hfence_lock);
/* Setup reset state of shadow SSTATUS and HSTATUS CSRs */
cntx = &vcpu->arch.guest_reset_context;
cntx->sstatus = SR_SPP | SR_SPIE;
@ -137,7 +146,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
/* Cleanup VCPU timer */
kvm_riscv_vcpu_timer_deinit(vcpu);
/* Free unused pages pre-allocated for Stage2 page table mappings */
/* Free unused pages pre-allocated for G-stage page table mappings */
kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
}
@ -365,6 +374,101 @@ static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
return 0;
}
/* Mapping between KVM ISA Extension ID & Host ISA extension ID */
static unsigned long kvm_isa_ext_arr[] = {
RISCV_ISA_EXT_a,
RISCV_ISA_EXT_c,
RISCV_ISA_EXT_d,
RISCV_ISA_EXT_f,
RISCV_ISA_EXT_h,
RISCV_ISA_EXT_i,
RISCV_ISA_EXT_m,
};
static int kvm_riscv_vcpu_get_reg_isa_ext(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_ISA_EXT);
unsigned long reg_val = 0;
unsigned long host_isa_ext;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
if (reg_num >= KVM_RISCV_ISA_EXT_MAX || reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
return -EINVAL;
host_isa_ext = kvm_isa_ext_arr[reg_num];
if (__riscv_isa_extension_available(&vcpu->arch.isa, host_isa_ext))
reg_val = 1; /* Mark the given extension as available */
if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
static int kvm_riscv_vcpu_set_reg_isa_ext(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_ISA_EXT);
unsigned long reg_val;
unsigned long host_isa_ext;
unsigned long host_isa_ext_mask;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
if (reg_num >= KVM_RISCV_ISA_EXT_MAX || reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
return -EINVAL;
if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
host_isa_ext = kvm_isa_ext_arr[reg_num];
if (!__riscv_isa_extension_available(NULL, host_isa_ext))
return -EOPNOTSUPP;
if (host_isa_ext >= RISCV_ISA_EXT_BASE &&
host_isa_ext < RISCV_ISA_EXT_MAX) {
/*
* Multi-letter ISA extension. Currently there is no provision
* to enable/disable the multi-letter ISA extensions for guests.
* Return success if the request is to enable any ISA extension
* that is available in the hardware.
* Return -EOPNOTSUPP otherwise.
*/
if (!reg_val)
return -EOPNOTSUPP;
else
return 0;
}
/* Single letter base ISA extension */
if (!vcpu->arch.ran_atleast_once) {
host_isa_ext_mask = BIT_MASK(host_isa_ext);
if (!reg_val && (host_isa_ext_mask & KVM_RISCV_ISA_DISABLE_ALLOWED))
vcpu->arch.isa &= ~host_isa_ext_mask;
else
vcpu->arch.isa |= host_isa_ext_mask;
vcpu->arch.isa &= riscv_isa_extension_base(NULL);
vcpu->arch.isa &= KVM_RISCV_ISA_ALLOWED;
kvm_riscv_vcpu_fp_reset(vcpu);
} else {
return -EOPNOTSUPP;
}
return 0;
}
static int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
@ -382,6 +486,8 @@ static int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_D)
return kvm_riscv_vcpu_set_reg_fp(vcpu, reg,
KVM_REG_RISCV_FP_D);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_ISA_EXT)
return kvm_riscv_vcpu_set_reg_isa_ext(vcpu, reg);
return -EINVAL;
}
@ -403,6 +509,8 @@ static int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu,
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_FP_D)
return kvm_riscv_vcpu_get_reg_fp(vcpu, reg,
KVM_REG_RISCV_FP_D);
else if ((reg->id & KVM_REG_RISCV_TYPE_MASK) == KVM_REG_RISCV_ISA_EXT)
return kvm_riscv_vcpu_get_reg_isa_ext(vcpu, reg);
return -EINVAL;
}
@ -635,7 +743,7 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
csr_write(CSR_HVIP, csr->hvip);
csr_write(CSR_VSATP, csr->vsatp);
kvm_riscv_stage2_update_hgatp(vcpu);
kvm_riscv_gstage_update_hgatp(vcpu);
kvm_riscv_vcpu_timer_restore(vcpu);
@ -690,10 +798,23 @@ static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu)
kvm_riscv_reset_vcpu(vcpu);
if (kvm_check_request(KVM_REQ_UPDATE_HGATP, vcpu))
kvm_riscv_stage2_update_hgatp(vcpu);
kvm_riscv_gstage_update_hgatp(vcpu);
if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
__kvm_riscv_hfence_gvma_all();
if (kvm_check_request(KVM_REQ_FENCE_I, vcpu))
kvm_riscv_fence_i_process(vcpu);
/*
* The generic KVM_REQ_TLB_FLUSH is same as
* KVM_REQ_HFENCE_GVMA_VMID_ALL
*/
if (kvm_check_request(KVM_REQ_HFENCE_GVMA_VMID_ALL, vcpu))
kvm_riscv_hfence_gvma_vmid_all_process(vcpu);
if (kvm_check_request(KVM_REQ_HFENCE_VVMA_ALL, vcpu))
kvm_riscv_hfence_vvma_all_process(vcpu);
if (kvm_check_request(KVM_REQ_HFENCE, vcpu))
kvm_riscv_hfence_process(vcpu);
}
}
@ -715,6 +836,7 @@ static void noinstr kvm_riscv_vcpu_enter_exit(struct kvm_vcpu *vcpu)
{
guest_state_enter_irqoff();
__kvm_riscv_switch_to(&vcpu->arch);
vcpu->arch.last_exit_cpu = vcpu->cpu;
guest_state_exit_irqoff();
}
@ -762,7 +884,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
/* Check conditions before entering the guest */
cond_resched();
kvm_riscv_stage2_vmid_update(vcpu);
kvm_riscv_gstage_vmid_update(vcpu);
kvm_riscv_check_vcpu_requests(vcpu);
@ -800,7 +922,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
kvm_riscv_update_hvip(vcpu);
if (ret <= 0 ||
kvm_riscv_stage2_vmid_ver_changed(&vcpu->kvm->arch.vmid) ||
kvm_riscv_gstage_vmid_ver_changed(&vcpu->kvm->arch.vmid) ||
kvm_request_pending(vcpu)) {
vcpu->mode = OUTSIDE_GUEST_MODE;
local_irq_enable();
@ -809,6 +931,14 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
continue;
}
/*
* Cleanup stale TLB enteries
*
* Note: This should be done after G-stage VMID has been
* updated using kvm_riscv_gstage_vmid_ver_changed()
*/
kvm_riscv_local_tlb_sanitize(vcpu);
guest_timing_enter_irqoff();
kvm_riscv_vcpu_enter_exit(vcpu);

6
arch/riscv/kvm/vcpu_exit.c
View File

@ -412,7 +412,7 @@ static int emulate_store(struct kvm_vcpu *vcpu, struct kvm_run *run,
return 0;
}
static int stage2_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,
static int gstage_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_cpu_trap *trap)
{
struct kvm_memory_slot *memslot;
@ -440,7 +440,7 @@ static int stage2_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,
};
}
ret = kvm_riscv_stage2_map(vcpu, memslot, fault_addr, hva,
ret = kvm_riscv_gstage_map(vcpu, memslot, fault_addr, hva,
(trap->scause == EXC_STORE_GUEST_PAGE_FAULT) ? true : false);
if (ret < 0)
return ret;
@ -686,7 +686,7 @@ int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
case EXC_LOAD_GUEST_PAGE_FAULT:
case EXC_STORE_GUEST_PAGE_FAULT:
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV)
ret = stage2_page_fault(vcpu, run, trap);
ret = gstage_page_fault(vcpu, run, trap);
break;
case EXC_SUPERVISOR_SYSCALL:
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV)

40
arch/riscv/kvm/vcpu_sbi_replace.c
View File

@ -81,43 +81,41 @@ static int kvm_sbi_ext_rfence_handler(struct kvm_vcpu *vcpu, struct kvm_run *run
struct kvm_cpu_trap *utrap, bool *exit)
{
int ret = 0;
unsigned long i;
struct cpumask cm;
struct kvm_vcpu *tmp;
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
unsigned long hmask = cp->a0;
unsigned long hbase = cp->a1;
unsigned long funcid = cp->a6;
cpumask_clear(&cm);
kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
if (hbase != -1UL) {
if (tmp->vcpu_id < hbase)
continue;
if (!(hmask & (1UL << (tmp->vcpu_id - hbase))))
continue;
}
if (tmp->cpu < 0)
continue;
cpumask_set_cpu(tmp->cpu, &cm);
}
switch (funcid) {
case SBI_EXT_RFENCE_REMOTE_FENCE_I:
ret = sbi_remote_fence_i(&cm);
kvm_riscv_fence_i(vcpu->kvm, hbase, hmask);
break;
case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
ret = sbi_remote_hfence_vvma(&cm, cp->a2, cp->a3);
if (cp->a2 == 0 && cp->a3 == 0)
kvm_riscv_hfence_vvma_all(vcpu->kvm, hbase, hmask);
else
kvm_riscv_hfence_vvma_gva(vcpu->kvm, hbase, hmask,
cp->a2, cp->a3, PAGE_SHIFT);
break;
case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
ret = sbi_remote_hfence_vvma_asid(&cm, cp->a2,
cp->a3, cp->a4);
if (cp->a2 == 0 && cp->a3 == 0)
kvm_riscv_hfence_vvma_asid_all(vcpu->kvm,
hbase, hmask, cp->a4);
else
kvm_riscv_hfence_vvma_asid_gva(vcpu->kvm,
hbase, hmask,
cp->a2, cp->a3,
PAGE_SHIFT, cp->a4);
break;
case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA:
case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID:
case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID:
/* TODO: implement for nested hypervisor case */
/*
* Until nested virtualization is implemented, the
* SBI HFENCE calls should be treated as NOPs
*/
break;
default:
ret = -EOPNOTSUPP;
}

35
arch/riscv/kvm/vcpu_sbi_v01.c
View File

@ -23,7 +23,6 @@ static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
int i, ret = 0;
u64 next_cycle;
struct kvm_vcpu *rvcpu;
struct cpumask cm;
struct kvm *kvm = vcpu->kvm;
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
@ -80,19 +79,29 @@ static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
if (utrap->scause)
break;
cpumask_clear(&cm);
for_each_set_bit(i, &hmask, BITS_PER_LONG) {
rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
if (rvcpu->cpu < 0)
continue;
cpumask_set_cpu(rvcpu->cpu, &cm);
}
if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
ret = sbi_remote_fence_i(&cm);
else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA)
ret = sbi_remote_hfence_vvma(&cm, cp->a1, cp->a2);
else
ret = sbi_remote_hfence_vvma_asid(&cm, cp->a1, cp->a2, cp->a3);
kvm_riscv_fence_i(vcpu->kvm, 0, hmask);
else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA) {
if (cp->a1 == 0 && cp->a2 == 0)
kvm_riscv_hfence_vvma_all(vcpu->kvm,
0, hmask);
else
kvm_riscv_hfence_vvma_gva(vcpu->kvm,
0, hmask,
cp->a1, cp->a2,
PAGE_SHIFT);
} else {
if (cp->a1 == 0 && cp->a2 == 0)
kvm_riscv_hfence_vvma_asid_all(vcpu->kvm,
0, hmask,
cp->a3);
else
kvm_riscv_hfence_vvma_asid_gva(vcpu->kvm,
0, hmask,
cp->a1, cp->a2,
PAGE_SHIFT,
cp->a3);
}
break;
default:
ret = -EINVAL;

8
arch/riscv/kvm/vm.c
View File

@ -31,13 +31,13 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
int r;
r = kvm_riscv_stage2_alloc_pgd(kvm);
r = kvm_riscv_gstage_alloc_pgd(kvm);
if (r)
return r;
r = kvm_riscv_stage2_vmid_init(kvm);
r = kvm_riscv_gstage_vmid_init(kvm);
if (r) {
kvm_riscv_stage2_free_pgd(kvm);
kvm_riscv_gstage_free_pgd(kvm);
return r;
}
@ -75,7 +75,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = KVM_USER_MEM_SLOTS;
break;
case KVM_CAP_VM_GPA_BITS:
r = kvm_riscv_stage2_gpa_bits();
r = kvm_riscv_gstage_gpa_bits();
break;
default:
r = 0;

30
arch/riscv/kvm/vmid.c
View File

@ -11,16 +11,16 @@
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
#include <asm/sbi.h>
static unsigned long vmid_version = 1;
static unsigned long vmid_next;
static unsigned long vmid_bits;
static DEFINE_SPINLOCK(vmid_lock);
void kvm_riscv_stage2_vmid_detect(void)
void kvm_riscv_gstage_vmid_detect(void)
{
unsigned long old;
@ -33,19 +33,19 @@ void kvm_riscv_stage2_vmid_detect(void)
csr_write(CSR_HGATP, old);
/* We polluted local TLB so flush all guest TLB */
__kvm_riscv_hfence_gvma_all();
kvm_riscv_local_hfence_gvma_all();
/* We don't use VMID bits if they are not sufficient */
if ((1UL << vmid_bits) < num_possible_cpus())
vmid_bits = 0;
}
unsigned long kvm_riscv_stage2_vmid_bits(void)
unsigned long kvm_riscv_gstage_vmid_bits(void)
{
return vmid_bits;
}
int kvm_riscv_stage2_vmid_init(struct kvm *kvm)
int kvm_riscv_gstage_vmid_init(struct kvm *kvm)
{
/* Mark the initial VMID and VMID version invalid */
kvm->arch.vmid.vmid_version = 0;
@ -54,7 +54,7 @@ int kvm_riscv_stage2_vmid_init(struct kvm *kvm)
return 0;
}
bool kvm_riscv_stage2_vmid_ver_changed(struct kvm_vmid *vmid)
bool kvm_riscv_gstage_vmid_ver_changed(struct kvm_vmid *vmid)
{
if (!vmid_bits)
return false;
@ -63,13 +63,18 @@ bool kvm_riscv_stage2_vmid_ver_changed(struct kvm_vmid *vmid)
READ_ONCE(vmid_version));
}
void kvm_riscv_stage2_vmid_update(struct kvm_vcpu *vcpu)
static void __local_hfence_gvma_all(void *info)
{
kvm_riscv_local_hfence_gvma_all();
}
void kvm_riscv_gstage_vmid_update(struct kvm_vcpu *vcpu)
{
unsigned long i;
struct kvm_vcpu *v;
struct kvm_vmid *vmid = &vcpu->kvm->arch.vmid;
if (!kvm_riscv_stage2_vmid_ver_changed(vmid))
if (!kvm_riscv_gstage_vmid_ver_changed(vmid))
return;
spin_lock(&vmid_lock);
@ -78,7 +83,7 @@ void kvm_riscv_stage2_vmid_update(struct kvm_vcpu *vcpu)
* We need to re-check the vmid_version here to ensure that if
* another vcpu already allocated a valid vmid for this vm.
*/
if (!kvm_riscv_stage2_vmid_ver_changed(vmid)) {
if (!kvm_riscv_gstage_vmid_ver_changed(vmid)) {
spin_unlock(&vmid_lock);
return;
}
@ -96,12 +101,13 @@ void kvm_riscv_stage2_vmid_update(struct kvm_vcpu *vcpu)
* instances is invalid and we have force VMID re-assignement
* for all Guest instances. The Guest instances that were not
* running will automatically pick-up new VMIDs because will
* call kvm_riscv_stage2_vmid_update() whenever they enter
* call kvm_riscv_gstage_vmid_update() whenever they enter
* in-kernel run loop. For Guest instances that are already
* running, we force VM exits on all host CPUs using IPI and
* flush all Guest TLBs.
*/
sbi_remote_hfence_gvma(cpu_online_mask, 0, 0);
on_each_cpu_mask(cpu_online_mask, __local_hfence_gvma_all,
NULL, 1);
}
vmid->vmid = vmid_next;
@ -112,7 +118,7 @@ void kvm_riscv_stage2_vmid_update(struct kvm_vcpu *vcpu)
spin_unlock(&vmid_lock);
/* Request stage2 page table update for all VCPUs */
/* Request G-stage page table update for all VCPUs */
kvm_for_each_vcpu(i, v, vcpu->kvm)
kvm_make_request(KVM_REQ_UPDATE_HGATP, v);
}

23
arch/s390/include/asm/uv.h
View File

@ -2,7 +2,7 @@
/*
* Ultravisor Interfaces
*
* Copyright IBM Corp. 2019
* Copyright IBM Corp. 2019, 2022
*
* Author(s):
* Vasily Gorbik <gor@linux.ibm.com>
@ -52,6 +52,7 @@
#define UVC_CMD_UNPIN_PAGE_SHARED 0x0342
#define UVC_CMD_SET_SHARED_ACCESS 0x1000
#define UVC_CMD_REMOVE_SHARED_ACCESS 0x1001
#define UVC_CMD_RETR_ATTEST 0x1020
/* Bits in installed uv calls */
enum uv_cmds_inst {
@ -76,6 +77,7 @@ enum uv_cmds_inst {
BIT_UVC_CMD_UNSHARE_ALL = 20,
BIT_UVC_CMD_PIN_PAGE_SHARED = 21,
BIT_UVC_CMD_UNPIN_PAGE_SHARED = 22,
BIT_UVC_CMD_RETR_ATTEST = 28,
};
enum uv_feat_ind {
@ -219,6 +221,25 @@ struct uv_cb_share {
u64 reserved28;
} __packed __aligned(8);
/* Retrieve Attestation Measurement */
struct uv_cb_attest {
struct uv_cb_header header; /* 0x0000 */
u64 reserved08[2]; /* 0x0008 */
u64 arcb_addr; /* 0x0018 */
u64 cont_token; /* 0x0020 */
u8 reserved28[6]; /* 0x0028 */
u16 user_data_len; /* 0x002e */
u8 user_data[256]; /* 0x0030 */
u32 reserved130[3]; /* 0x0130 */
u32 meas_len; /* 0x013c */
u64 meas_addr; /* 0x0140 */
u8 config_uid[16]; /* 0x0148 */
u32 reserved158; /* 0x0158 */
u32 add_data_len; /* 0x015c */
u64 add_data_addr; /* 0x0160 */
u64 reserved168[4]; /* 0x0168 */
} __packed __aligned(8);
static inline int __uv_call(unsigned long r1, unsigned long r2)
{
int cc;

51
arch/s390/include/uapi/asm/uvdevice.h Normal file
View File

@ -0,0 +1,51 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Copyright IBM Corp. 2022
* Author(s): Steffen Eiden <seiden@linux.ibm.com>
*/
#ifndef __S390_ASM_UVDEVICE_H
#define __S390_ASM_UVDEVICE_H
#include <linux/types.h>
struct uvio_ioctl_cb {
__u32 flags;
__u16 uv_rc; /* UV header rc value */
__u16 uv_rrc; /* UV header rrc value */
__u64 argument_addr; /* Userspace address of uvio argument */
__u32 argument_len;
__u8 reserved14[0x40 - 0x14]; /* must be zero */
};
#define UVIO_ATT_USER_DATA_LEN 0x100
#define UVIO_ATT_UID_LEN 0x10
struct uvio_attest {
__u64 arcb_addr; /* 0x0000 */
__u64 meas_addr; /* 0x0008 */
__u64 add_data_addr; /* 0x0010 */
__u8 user_data[UVIO_ATT_USER_DATA_LEN]; /* 0x0018 */
__u8 config_uid[UVIO_ATT_UID_LEN]; /* 0x0118 */
__u32 arcb_len; /* 0x0128 */
__u32 meas_len; /* 0x012c */
__u32 add_data_len; /* 0x0130 */
__u16 user_data_len; /* 0x0134 */
__u16 reserved136; /* 0x0136 */
};
/*
* The following max values define an upper length for the IOCTL in/out buffers.
* However, they do not represent the maximum the Ultravisor allows which is
* often way smaller. By allowing larger buffer sizes we hopefully do not need
* to update the code with every machine update. It is therefore possible for
* userspace to request more memory than actually used by kernel/UV.
*/
#define UVIO_ATT_ARCB_MAX_LEN 0x100000
#define UVIO_ATT_MEASUREMENT_MAX_LEN 0x8000
#define UVIO_ATT_ADDITIONAL_MAX_LEN 0x8000
#define UVIO_DEVICE_NAME "uv"
#define UVIO_TYPE_UVC 'u'
#define UVIO_IOCTL_ATT _IOWR(UVIO_TYPE_UVC, 0x01, struct uvio_ioctl_cb)
#endif /* __S390_ASM_UVDEVICE_H */

22
arch/s390/kvm/gaccess.c
View File

@ -491,8 +491,8 @@ enum prot_type {
PROT_TYPE_IEP = 4,
};
static int trans_exc(struct kvm_vcpu *vcpu, int code, unsigned long gva,
u8 ar, enum gacc_mode mode, enum prot_type prot)
static int trans_exc_ending(struct kvm_vcpu *vcpu, int code, unsigned long gva, u8 ar,
enum gacc_mode mode, enum prot_type prot, bool terminate)
{
struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
struct trans_exc_code_bits *tec;
@ -520,6 +520,11 @@ static int trans_exc(struct kvm_vcpu *vcpu, int code, unsigned long gva,
tec->b61 = 1;
break;
}
if (terminate) {
tec->b56 = 0;
tec->b60 = 0;
tec->b61 = 0;
}
fallthrough;
case PGM_ASCE_TYPE:
case PGM_PAGE_TRANSLATION:
@ -552,6 +557,12 @@ static int trans_exc(struct kvm_vcpu *vcpu, int code, unsigned long gva,
return code;
}
static int trans_exc(struct kvm_vcpu *vcpu, int code, unsigned long gva, u8 ar,
enum gacc_mode mode, enum prot_type prot)
{
return trans_exc_ending(vcpu, code, gva, ar, mode, prot, false);
}
static int get_vcpu_asce(struct kvm_vcpu *vcpu, union asce *asce,
unsigned long ga, u8 ar, enum gacc_mode mode)
{
@ -1109,8 +1120,11 @@ int access_guest_with_key(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
data += fragment_len;
ga = kvm_s390_logical_to_effective(vcpu, ga + fragment_len);
}
if (rc > 0)
rc = trans_exc(vcpu, rc, ga, ar, mode, prot);
if (rc > 0) {
bool terminate = (mode == GACC_STORE) && (idx > 0);
rc = trans_exc_ending(vcpu, rc, ga, ar, mode, prot, terminate);
}
out_unlock:
if (need_ipte_lock)
ipte_unlock(vcpu);

1
arch/x86/include/asm/cpufeatures.h
View File

@ -407,6 +407,7 @@
#define X86_FEATURE_SEV (19*32+ 1) /* AMD Secure Encrypted Virtualization */
#define X86_FEATURE_VM_PAGE_FLUSH (19*32+ 2) /* "" VM Page Flush MSR is supported */
#define X86_FEATURE_SEV_ES (19*32+ 3) /* AMD Secure Encrypted Virtualization - Encrypted State */
#define X86_FEATURE_V_TSC_AUX (19*32+ 9) /* "" Virtual TSC_AUX */
#define X86_FEATURE_SME_COHERENT (19*32+10) /* "" AMD hardware-enforced cache coherency */
/*

1
arch/x86/include/asm/kvm-x86-ops.h
View File

@ -127,6 +127,7 @@ KVM_X86_OP_OPTIONAL(migrate_timers)
KVM_X86_OP(msr_filter_changed)
KVM_X86_OP(complete_emulated_msr)
KVM_X86_OP(vcpu_deliver_sipi_vector)
KVM_X86_OP_OPTIONAL_RET0(vcpu_get_apicv_inhibit_reasons);
#undef KVM_X86_OP
#undef KVM_X86_OP_OPTIONAL

31
arch/x86/include/asm/kvm-x86-pmu-ops.h Normal file
View File

@ -0,0 +1,31 @@
/* SPDX-License-Identifier: GPL-2.0 */
#if !defined(KVM_X86_PMU_OP) || !defined(KVM_X86_PMU_OP_OPTIONAL)
BUILD_BUG_ON(1)
#endif
/*
* KVM_X86_PMU_OP() and KVM_X86_PMU_OP_OPTIONAL() are used to help generate
* both DECLARE/DEFINE_STATIC_CALL() invocations and
* "static_call_update()" calls.
*
* KVM_X86_PMU_OP_OPTIONAL() can be used for those functions that can have
* a NULL definition, for example if "static_call_cond()" will be used
* at the call sites.
*/
KVM_X86_PMU_OP(pmc_perf_hw_id)
KVM_X86_PMU_OP(pmc_is_enabled)
KVM_X86_PMU_OP(pmc_idx_to_pmc)
KVM_X86_PMU_OP(rdpmc_ecx_to_pmc)
KVM_X86_PMU_OP(msr_idx_to_pmc)
KVM_X86_PMU_OP(is_valid_rdpmc_ecx)
KVM_X86_PMU_OP(is_valid_msr)
KVM_X86_PMU_OP(get_msr)
KVM_X86_PMU_OP(set_msr)
KVM_X86_PMU_OP(refresh)
KVM_X86_PMU_OP(init)
KVM_X86_PMU_OP(reset)
KVM_X86_PMU_OP_OPTIONAL(deliver_pmi)
KVM_X86_PMU_OP_OPTIONAL(cleanup)
#undef KVM_X86_PMU_OP
#undef KVM_X86_PMU_OP_OPTIONAL

93
arch/x86/include/asm/kvm_host.h
View File

@ -281,11 +281,11 @@ struct kvm_kernel_irq_routing_entry;
/*
* kvm_mmu_page_role tracks the properties of a shadow page (where shadow page
* also includes TDP pages) to determine whether or not a page can be used in
* the given MMU context. This is a subset of the overall kvm_mmu_role to
* the given MMU context. This is a subset of the overall kvm_cpu_role to
* minimize the size of kvm_memory_slot.arch.gfn_track, i.e. allows allocating
* 2 bytes per gfn instead of 4 bytes per gfn.
*
* Indirect upper-level shadow pages are tracked for write-protection via
* Upper-level shadow pages having gptes are tracked for write-protection via
* gfn_track. As above, gfn_track is a 16 bit counter, so KVM must not create
* more than 2^16-1 upper-level shadow pages at a single gfn, otherwise
* gfn_track will overflow and explosions will ensure.
@ -331,7 +331,8 @@ union kvm_mmu_page_role {
unsigned smap_andnot_wp:1;
unsigned ad_disabled:1;
unsigned guest_mode:1;
unsigned :6;
unsigned passthrough:1;
unsigned :5;
/*
* This is left at the top of the word so that
@ -367,8 +368,6 @@ union kvm_mmu_extended_role {
struct {
unsigned int valid:1;
unsigned int execonly:1;
unsigned int cr0_pg:1;
unsigned int cr4_pae:1;
unsigned int cr4_pse:1;
unsigned int cr4_pke:1;
unsigned int cr4_smap:1;
@ -378,7 +377,7 @@ union kvm_mmu_extended_role {
};
};
union kvm_mmu_role {
union kvm_cpu_role {
u64 as_u64;
struct {
union kvm_mmu_page_role base;
@ -438,19 +437,8 @@ struct kvm_mmu {
struct kvm_mmu_page *sp);
void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa);
struct kvm_mmu_root_info root;
union kvm_mmu_role mmu_role;
u8 root_level;
u8 shadow_root_level;
u8 ept_ad;
bool direct_map;
struct kvm_mmu_root_info prev_roots[KVM_MMU_NUM_PREV_ROOTS];
/*
* Bitmap; bit set = permission fault
* Byte index: page fault error code [4:1]
* Bit index: pte permissions in ACC_* format
*/
u8 permissions[16];
union kvm_cpu_role cpu_role;
union kvm_mmu_page_role root_role;
/*
* The pkru_mask indicates if protection key checks are needed. It
@ -460,6 +448,15 @@ struct kvm_mmu {
*/
u32 pkru_mask;
struct kvm_mmu_root_info prev_roots[KVM_MMU_NUM_PREV_ROOTS];
/*
* Bitmap; bit set = permission fault
* Byte index: page fault error code [4:1]
* Bit index: pte permissions in ACC_* format
*/
u8 permissions[16];
u64 *pae_root;
u64 *pml4_root;
u64 *pml5_root;
@ -607,16 +604,21 @@ struct kvm_vcpu_hv {
struct kvm_vcpu_xen {
u64 hypercall_rip;
u32 current_runstate;
bool vcpu_info_set;
bool vcpu_time_info_set;
bool runstate_set;
struct gfn_to_hva_cache vcpu_info_cache;
struct gfn_to_hva_cache vcpu_time_info_cache;
struct gfn_to_hva_cache runstate_cache;
u8 upcall_vector;
struct gfn_to_pfn_cache vcpu_info_cache;
struct gfn_to_pfn_cache vcpu_time_info_cache;
struct gfn_to_pfn_cache runstate_cache;
u64 last_steal;
u64 runstate_entry_time;
u64 runstate_times[4];
unsigned long evtchn_pending_sel;
u32 vcpu_id; /* The Xen / ACPI vCPU ID */
u32 timer_virq;
u64 timer_expires; /* In guest epoch */
atomic_t timer_pending;
struct hrtimer timer;
int poll_evtchn;
struct timer_list poll_timer;
};
struct kvm_vcpu_arch {
@ -753,8 +755,7 @@ struct kvm_vcpu_arch {
gpa_t time;
struct pvclock_vcpu_time_info hv_clock;
unsigned int hw_tsc_khz;
struct gfn_to_hva_cache pv_time;
bool pv_time_enabled;
struct gfn_to_pfn_cache pv_time;
/* set guest stopped flag in pvclock flags field */
bool pvclock_set_guest_stopped_request;
@ -1024,9 +1025,12 @@ struct msr_bitmap_range {
/* Xen emulation context */
struct kvm_xen {
u32 xen_version;
bool long_mode;
u8 upcall_vector;
struct gfn_to_pfn_cache shinfo_cache;
struct idr evtchn_ports;
unsigned long poll_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
};
enum kvm_irqchip_mode {
@ -1119,6 +1123,8 @@ struct kvm_arch {
u64 cur_tsc_generation;
int nr_vcpus_matched_tsc;
u32 default_tsc_khz;
seqcount_raw_spinlock_t pvclock_sc;
bool use_master_clock;
u64 master_kernel_ns;
@ -1263,7 +1269,12 @@ struct kvm_vm_stat {
struct kvm_vcpu_stat {
struct kvm_vcpu_stat_generic generic;
u64 pf_taken;
u64 pf_fixed;
u64 pf_emulate;
u64 pf_spurious;
u64 pf_fast;
u64 pf_mmio_spte_created;
u64 pf_guest;
u64 tlb_flush;
u64 invlpg;
@ -1455,8 +1466,6 @@ struct kvm_x86_ops {
int cpu_dirty_log_size;
void (*update_cpu_dirty_logging)(struct kvm_vcpu *vcpu);
/* pmu operations of sub-arch */
const struct kvm_pmu_ops *pmu_ops;
const struct kvm_x86_nested_ops *nested_ops;
void (*vcpu_blocking)(struct kvm_vcpu *vcpu);
@ -1499,11 +1508,18 @@ struct kvm_x86_ops {
int (*complete_emulated_msr)(struct kvm_vcpu *vcpu, int err);
void (*vcpu_deliver_sipi_vector)(struct kvm_vcpu *vcpu, u8 vector);
/*
* Returns vCPU specific APICv inhibit reasons
*/
unsigned long (*vcpu_get_apicv_inhibit_reasons)(struct kvm_vcpu *vcpu);
};
struct kvm_x86_nested_ops {
void (*leave_nested)(struct kvm_vcpu *vcpu);
int (*check_events)(struct kvm_vcpu *vcpu);
bool (*handle_page_fault_workaround)(struct kvm_vcpu *vcpu,
struct x86_exception *fault);
bool (*hv_timer_pending)(struct kvm_vcpu *vcpu);
void (*triple_fault)(struct kvm_vcpu *vcpu);
int (*get_state)(struct kvm_vcpu *vcpu,
@ -1528,6 +1544,7 @@ struct kvm_x86_init_ops {
unsigned int (*handle_intel_pt_intr)(void);
struct kvm_x86_ops *runtime_ops;
struct kvm_pmu_ops *pmu_ops;
};
struct kvm_arch_async_pf {
@ -1549,20 +1566,6 @@ extern struct kvm_x86_ops kvm_x86_ops;
#define KVM_X86_OP_OPTIONAL_RET0 KVM_X86_OP
#include <asm/kvm-x86-ops.h>
static inline void kvm_ops_static_call_update(void)
{
#define __KVM_X86_OP(func) \
static_call_update(kvm_x86_##func, kvm_x86_ops.func);
#define KVM_X86_OP(func) \
WARN_ON(!kvm_x86_ops.func); __KVM_X86_OP(func)
#define KVM_X86_OP_OPTIONAL __KVM_X86_OP
#define KVM_X86_OP_OPTIONAL_RET0(func) \
static_call_update(kvm_x86_##func, (void *)kvm_x86_ops.func ? : \
(void *)__static_call_return0);
#include <asm/kvm-x86-ops.h>
#undef __KVM_X86_OP
}
#define __KVM_HAVE_ARCH_VM_ALLOC
static inline struct kvm *kvm_arch_alloc_vm(void)
{
@ -1800,6 +1803,7 @@ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
struct x86_exception *exception);
bool kvm_apicv_activated(struct kvm *kvm);
bool kvm_vcpu_apicv_activated(struct kvm_vcpu *vcpu);
void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu);
void __kvm_set_or_clear_apicv_inhibit(struct kvm *kvm,
enum kvm_apicv_inhibit reason, bool set);
@ -1989,6 +1993,7 @@ int memslot_rmap_alloc(struct kvm_memory_slot *slot, unsigned long npages);
KVM_X86_QUIRK_CD_NW_CLEARED | \
KVM_X86_QUIRK_LAPIC_MMIO_HOLE | \
KVM_X86_QUIRK_OUT_7E_INC_RIP | \
KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT)
KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT | \
KVM_X86_QUIRK_FIX_HYPERCALL_INSN)
#endif /* _ASM_X86_KVM_HOST_H */

142
arch/x86/include/asm/uaccess.h
View File

@ -382,6 +382,103 @@ do { \
#endif // CONFIG_CC_HAS_ASM_GOTO_OUTPUT
#ifdef CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT
#define __try_cmpxchg_user_asm(itype, ltype, _ptr, _pold, _new, label) ({ \
bool success; \
__typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \
__typeof__(*(_ptr)) __old = *_old; \
__typeof__(*(_ptr)) __new = (_new); \
asm_volatile_goto("\n" \
"1: " LOCK_PREFIX "cmpxchg"itype" %[new], %[ptr]\n"\
_ASM_EXTABLE_UA(1b, %l[label]) \
: CC_OUT(z) (success), \
[ptr] "+m" (*_ptr), \
[old] "+a" (__old) \
: [new] ltype (__new) \
: "memory" \
: label); \
if (unlikely(!success)) \
*_old = __old; \
likely(success); })
#ifdef CONFIG_X86_32
#define __try_cmpxchg64_user_asm(_ptr, _pold, _new, label) ({ \
bool success; \
__typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \
__typeof__(*(_ptr)) __old = *_old; \
__typeof__(*(_ptr)) __new = (_new); \
asm_volatile_goto("\n" \
"1: " LOCK_PREFIX "cmpxchg8b %[ptr]\n" \
_ASM_EXTABLE_UA(1b, %l[label]) \
: CC_OUT(z) (success), \
"+A" (__old), \
[ptr] "+m" (*_ptr) \
: "b" ((u32)__new), \
"c" ((u32)((u64)__new >> 32)) \
: "memory" \
: label); \
if (unlikely(!success)) \
*_old = __old; \
likely(success); })
#endif // CONFIG_X86_32
#else // !CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT
#define __try_cmpxchg_user_asm(itype, ltype, _ptr, _pold, _new, label) ({ \
int __err = 0; \
bool success; \
__typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \
__typeof__(*(_ptr)) __old = *_old; \
__typeof__(*(_ptr)) __new = (_new); \
asm volatile("\n" \
"1: " LOCK_PREFIX "cmpxchg"itype" %[new], %[ptr]\n"\
CC_SET(z) \
"2:\n" \
_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, \
%[errout]) \
: CC_OUT(z) (success), \
[errout] "+r" (__err), \
[ptr] "+m" (*_ptr), \
[old] "+a" (__old) \
: [new] ltype (__new) \
: "memory", "cc"); \
if (unlikely(__err)) \
goto label; \
if (unlikely(!success)) \
*_old = __old; \
likely(success); })
#ifdef CONFIG_X86_32
/*
* Unlike the normal CMPXCHG, hardcode ECX for both success/fail and error.
* There are only six GPRs available and four (EAX, EBX, ECX, and EDX) are
* hardcoded by CMPXCHG8B, leaving only ESI and EDI. If the compiler uses
* both ESI and EDI for the memory operand, compilation will fail if the error
* is an input+output as there will be no register available for input.
*/
#define __try_cmpxchg64_user_asm(_ptr, _pold, _new, label) ({ \
int __result; \
__typeof__(_ptr) _old = (__typeof__(_ptr))(_pold); \
__typeof__(*(_ptr)) __old = *_old; \
__typeof__(*(_ptr)) __new = (_new); \
asm volatile("\n" \
"1: " LOCK_PREFIX "cmpxchg8b %[ptr]\n" \
"mov $0, %%ecx\n\t" \
"setz %%cl\n" \
"2:\n" \
_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %%ecx) \
: [result]"=c" (__result), \
"+A" (__old), \
[ptr] "+m" (*_ptr) \
: "b" ((u32)__new), \
"c" ((u32)((u64)__new >> 32)) \
: "memory", "cc"); \
if (unlikely(__result < 0)) \
goto label; \
if (unlikely(!__result)) \
*_old = __old; \
likely(__result); })
#endif // CONFIG_X86_32
#endif // CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT
/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
@ -474,6 +571,51 @@ do { \
} while (0)
#endif // CONFIG_CC_HAS_ASM_GOTO_OUTPUT
extern void __try_cmpxchg_user_wrong_size(void);
#ifndef CONFIG_X86_32
#define __try_cmpxchg64_user_asm(_ptr, _oldp, _nval, _label) \
__try_cmpxchg_user_asm("q", "r", (_ptr), (_oldp), (_nval), _label)
#endif
/*
* Force the pointer to u<size> to match the size expected by the asm helper.
* clang/LLVM compiles all cases and only discards the unused paths after
* processing errors, which breaks i386 if the pointer is an 8-byte value.
*/
#define unsafe_try_cmpxchg_user(_ptr, _oldp, _nval, _label) ({ \
bool __ret; \
__chk_user_ptr(_ptr); \
switch (sizeof(*(_ptr))) { \
case 1: __ret = __try_cmpxchg_user_asm("b", "q", \
(__force u8 *)(_ptr), (_oldp), \
(_nval), _label); \
break; \
case 2: __ret = __try_cmpxchg_user_asm("w", "r", \
(__force u16 *)(_ptr), (_oldp), \
(_nval), _label); \
break; \
case 4: __ret = __try_cmpxchg_user_asm("l", "r", \
(__force u32 *)(_ptr), (_oldp), \
(_nval), _label); \
break; \
case 8: __ret = __try_cmpxchg64_user_asm((__force u64 *)(_ptr), (_oldp),\
(_nval), _label); \
break; \
default: __try_cmpxchg_user_wrong_size(); \
} \
__ret; })
/* "Returns" 0 on success, 1 on failure, -EFAULT if the access faults. */
#define __try_cmpxchg_user(_ptr, _oldp, _nval, _label) ({ \
int __ret = -EFAULT; \
__uaccess_begin_nospec(); \
__ret = !unsafe_try_cmpxchg_user(_ptr, _oldp, _nval, _label); \
_label: \
__uaccess_end(); \
__ret; \
})
/*
* We want the unsafe accessors to always be inlined and use
* the error labels - thus the macro games.

10
arch/x86/include/asm/vmx.h
View File

@ -543,16 +543,14 @@ enum vm_entry_failure_code {
#define EPT_VIOLATION_ACC_READ_BIT 0
#define EPT_VIOLATION_ACC_WRITE_BIT 1
#define EPT_VIOLATION_ACC_INSTR_BIT 2
#define EPT_VIOLATION_READABLE_BIT 3
#define EPT_VIOLATION_WRITABLE_BIT 4
#define EPT_VIOLATION_EXECUTABLE_BIT 5
#define EPT_VIOLATION_RWX_SHIFT 3
#define EPT_VIOLATION_GVA_IS_VALID_BIT 7
#define EPT_VIOLATION_GVA_TRANSLATED_BIT 8
#define EPT_VIOLATION_ACC_READ (1 << EPT_VIOLATION_ACC_READ_BIT)
#define EPT_VIOLATION_ACC_WRITE (1 << EPT_VIOLATION_ACC_WRITE_BIT)
#define EPT_VIOLATION_ACC_INSTR (1 << EPT_VIOLATION_ACC_INSTR_BIT)
#define EPT_VIOLATION_READABLE (1 << EPT_VIOLATION_READABLE_BIT)
#define EPT_VIOLATION_WRITABLE (1 << EPT_VIOLATION_WRITABLE_BIT)
#define EPT_VIOLATION_EXECUTABLE (1 << EPT_VIOLATION_EXECUTABLE_BIT)
#define EPT_VIOLATION_RWX_MASK (VMX_EPT_RWX_MASK << EPT_VIOLATION_RWX_SHIFT)
#define EPT_VIOLATION_GVA_IS_VALID (1 << EPT_VIOLATION_GVA_IS_VALID_BIT)
#define EPT_VIOLATION_GVA_TRANSLATED (1 << EPT_VIOLATION_GVA_TRANSLATED_BIT)
/*

11
arch/x86/include/uapi/asm/kvm.h
View File

@ -428,11 +428,12 @@ struct kvm_sync_regs {
struct kvm_vcpu_events events;
};
#define KVM_X86_QUIRK_LINT0_REENABLED (1 << 0)
#define KVM_X86_QUIRK_CD_NW_CLEARED (1 << 1)
#define KVM_X86_QUIRK_LAPIC_MMIO_HOLE (1 << 2)
#define KVM_X86_QUIRK_OUT_7E_INC_RIP (1 << 3)
#define KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT (1 << 4)
#define KVM_X86_QUIRK_LINT0_REENABLED (1 << 0)
#define KVM_X86_QUIRK_CD_NW_CLEARED (1 << 1)
#define KVM_X86_QUIRK_LAPIC_MMIO_HOLE (1 << 2)
#define KVM_X86_QUIRK_OUT_7E_INC_RIP (1 << 3)
#define KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT (1 << 4)
#define KVM_X86_QUIRK_FIX_HYPERCALL_INSN (1 << 5)
#define KVM_STATE_NESTED_FORMAT_VMX 0
#define KVM_STATE_NESTED_FORMAT_SVM 1

4
arch/x86/kernel/asm-offsets_64.c
View File

@ -5,7 +5,7 @@
#include <asm/ia32.h>
#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_PARAVIRT_SPINLOCKS)
#if defined(CONFIG_KVM_GUEST)
#include <asm/kvm_para.h>
#endif
@ -20,7 +20,7 @@ int main(void)
BLANK();
#endif
#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_PARAVIRT_SPINLOCKS)
#if defined(CONFIG_KVM_GUEST)
OFFSET(KVM_STEAL_TIME_preempted, kvm_steal_time, preempted);
BLANK();
#endif

17
arch/x86/kernel/fpu/core.c
View File

@ -14,6 +14,8 @@
#include <asm/traps.h>
#include <asm/irq_regs.h>
#include <uapi/asm/kvm.h>
#include <linux/hardirq.h>
#include <linux/pkeys.h>
#include <linux/vmalloc.h>
@ -232,7 +234,20 @@ bool fpu_alloc_guest_fpstate(struct fpu_guest *gfpu)
gfpu->fpstate = fpstate;
gfpu->xfeatures = fpu_user_cfg.default_features;
gfpu->perm = fpu_user_cfg.default_features;
gfpu->uabi_size = fpu_user_cfg.default_size;
/*
* KVM sets the FP+SSE bits in the XSAVE header when copying FPU state
* to userspace, even when XSAVE is unsupported, so that restoring FPU
* state on a different CPU that does support XSAVE can cleanly load
* the incoming state using its natural XSAVE. In other words, KVM's
* uABI size may be larger than this host's default size. Conversely,
* the default size should never be larger than KVM's base uABI size;
* all features that can expand the uABI size must be opt-in.
*/
gfpu->uabi_size = sizeof(struct kvm_xsave);
if (WARN_ON_ONCE(fpu_user_cfg.default_size > gfpu->uabi_size))
gfpu->uabi_size = fpu_user_cfg.default_size;
fpu_init_guest_permissions(gfpu);
return true;

120
arch/x86/kernel/kvm.c
View File

@ -191,7 +191,7 @@ void kvm_async_pf_task_wake(u32 token)
{
u32 key = hash_32(token, KVM_TASK_SLEEP_HASHBITS);
struct kvm_task_sleep_head *b = &async_pf_sleepers[key];
struct kvm_task_sleep_node *n;
struct kvm_task_sleep_node *n, *dummy = NULL;
if (token == ~0) {
apf_task_wake_all();
@ -203,28 +203,41 @@ again:
n = _find_apf_task(b, token);
if (!n) {
/*
* async PF was not yet handled.
* Add dummy entry for the token.
* Async #PF not yet handled, add a dummy entry for the token.
* Allocating the token must be down outside of the raw lock
* as the allocator is preemptible on PREEMPT_RT kernels.
*/
n = kzalloc(sizeof(*n), GFP_ATOMIC);
if (!n) {
/*
* Allocation failed! Busy wait while other cpu
* handles async PF.
*/
if (!dummy) {
raw_spin_unlock(&b->lock);
cpu_relax();
dummy = kzalloc(sizeof(*dummy), GFP_ATOMIC);
/*
* Continue looping on allocation failure, eventually
* the async #PF will be handled and allocating a new
* node will be unnecessary.
*/
if (!dummy)
cpu_relax();
/*
* Recheck for async #PF completion before enqueueing
* the dummy token to avoid duplicate list entries.
*/
goto again;
}
n->token = token;
n->cpu = smp_processor_id();
init_swait_queue_head(&n->wq);
hlist_add_head(&n->link, &b->list);
dummy->token = token;
dummy->cpu = smp_processor_id();
init_swait_queue_head(&dummy->wq);
hlist_add_head(&dummy->link, &b->list);
dummy = NULL;
} else {
apf_task_wake_one(n);
}
raw_spin_unlock(&b->lock);
return;
/* A dummy token might be allocated and ultimately not used. */
if (dummy)
kfree(dummy);
}
EXPORT_SYMBOL_GPL(kvm_async_pf_task_wake);
@ -765,6 +778,42 @@ static void kvm_crash_shutdown(struct pt_regs *regs)
}
#endif
#if defined(CONFIG_X86_32) || !defined(CONFIG_SMP)
bool __kvm_vcpu_is_preempted(long cpu);
__visible bool __kvm_vcpu_is_preempted(long cpu)
{
struct kvm_steal_time *src = &per_cpu(steal_time, cpu);
return !!(src->preempted & KVM_VCPU_PREEMPTED);
}
PV_CALLEE_SAVE_REGS_THUNK(__kvm_vcpu_is_preempted);
#else
#include <asm/asm-offsets.h>
extern bool __raw_callee_save___kvm_vcpu_is_preempted(long);
/*
* Hand-optimize version for x86-64 to avoid 8 64-bit register saving and
* restoring to/from the stack.
*/
asm(
".pushsection .text;"
".global __raw_callee_save___kvm_vcpu_is_preempted;"
".type __raw_callee_save___kvm_vcpu_is_preempted, @function;"
"__raw_callee_save___kvm_vcpu_is_preempted:"
ASM_ENDBR
"movq __per_cpu_offset(,%rdi,8), %rax;"
"cmpb $0, " __stringify(KVM_STEAL_TIME_preempted) "+steal_time(%rax);"
"setne %al;"
ASM_RET
".size __raw_callee_save___kvm_vcpu_is_preempted, .-__raw_callee_save___kvm_vcpu_is_preempted;"
".popsection");
#endif
static void __init kvm_guest_init(void)
{
int i;
@ -777,6 +826,9 @@ static void __init kvm_guest_init(void)
if (kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
has_steal_clock = 1;
static_call_update(pv_steal_clock, kvm_steal_clock);
pv_ops.lock.vcpu_is_preempted =
PV_CALLEE_SAVE(__kvm_vcpu_is_preempted);
}
if (kvm_para_has_feature(KVM_FEATURE_PV_EOI))
@ -1018,40 +1070,6 @@ static void kvm_wait(u8 *ptr, u8 val)
}
}
#ifdef CONFIG_X86_32
__visible bool __kvm_vcpu_is_preempted(long cpu)
{
struct kvm_steal_time *src = &per_cpu(steal_time, cpu);
return !!(src->preempted & KVM_VCPU_PREEMPTED);
}
PV_CALLEE_SAVE_REGS_THUNK(__kvm_vcpu_is_preempted);
#else
#include <asm/asm-offsets.h>
extern bool __raw_callee_save___kvm_vcpu_is_preempted(long);
/*
* Hand-optimize version for x86-64 to avoid 8 64-bit register saving and
* restoring to/from the stack.
*/
asm(
".pushsection .text;"
".global __raw_callee_save___kvm_vcpu_is_preempted;"
".type __raw_callee_save___kvm_vcpu_is_preempted, @function;"
"__raw_callee_save___kvm_vcpu_is_preempted:"
ASM_ENDBR
"movq __per_cpu_offset(,%rdi,8), %rax;"
"cmpb $0, " __stringify(KVM_STEAL_TIME_preempted) "+steal_time(%rax);"
"setne %al;"
ASM_RET
".size __raw_callee_save___kvm_vcpu_is_preempted, .-__raw_callee_save___kvm_vcpu_is_preempted;"
".popsection");
#endif
/*
* Setup pv_lock_ops to exploit KVM_FEATURE_PV_UNHALT if present.
*/
@ -1095,10 +1113,6 @@ void __init kvm_spinlock_init(void)
pv_ops.lock.wait = kvm_wait;
pv_ops.lock.kick = kvm_kick_cpu;
if (kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
pv_ops.lock.vcpu_is_preempted =
PV_CALLEE_SAVE(__kvm_vcpu_is_preempted);
}
/*
* When PV spinlock is enabled which is preferred over
* virt_spin_lock(), virt_spin_lock_key's value is meaningless.

2
arch/x86/kernel/kvmclock.c
View File

@ -239,7 +239,7 @@ static void __init kvmclock_init_mem(void)
static int __init kvm_setup_vsyscall_timeinfo(void)
{
if (!kvm_para_available() || !kvmclock)
if (!kvm_para_available() || !kvmclock || nopv)
return 0;
kvmclock_init_mem();

1
arch/x86/kvm/i8259.c
View File

@ -252,7 +252,6 @@ int kvm_pic_read_irq(struct kvm *kvm)
*/
irq2 = 7;
intno = s->pics[1].irq_base + irq2;
irq = irq2 + 8;
} else
intno = s->pics[0].irq_base + irq;
} else {

12
arch/x86/kvm/irq.c
View File

@ -22,10 +22,14 @@
*/
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
if (lapic_in_kernel(vcpu))
return apic_has_pending_timer(vcpu);
int r = 0;
return 0;
if (lapic_in_kernel(vcpu))
r = apic_has_pending_timer(vcpu);
if (kvm_xen_timer_enabled(vcpu))
r += kvm_xen_has_pending_timer(vcpu);
return r;
}
EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
@ -143,6 +147,8 @@ void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
{
if (lapic_in_kernel(vcpu))
kvm_inject_apic_timer_irqs(vcpu);
if (kvm_xen_timer_enabled(vcpu))
kvm_xen_inject_timer_irqs(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs);

2
arch/x86/kvm/irq_comm.c
View File

@ -181,7 +181,7 @@ int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
if (!level)
return -1;
return kvm_xen_set_evtchn_fast(e, kvm);
return kvm_xen_set_evtchn_fast(&e->xen_evtchn, kvm);
#endif
default:
break;

5
arch/x86/kvm/lapic.c
View File

@ -1548,6 +1548,7 @@ static void cancel_apic_timer(struct kvm_lapic *apic)
if (apic->lapic_timer.hv_timer_in_use)
cancel_hv_timer(apic);
preempt_enable();
atomic_set(&apic->lapic_timer.pending, 0);
}
static void apic_update_lvtt(struct kvm_lapic *apic)
@ -1648,10 +1649,10 @@ static void __kvm_wait_lapic_expire(struct kvm_vcpu *vcpu)
tsc_deadline = apic->lapic_timer.expired_tscdeadline;
apic->lapic_timer.expired_tscdeadline = 0;
guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
apic->lapic_timer.advance_expire_delta = guest_tsc - tsc_deadline;
trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
if (lapic_timer_advance_dynamic) {
adjust_lapic_timer_advance(vcpu, apic->lapic_timer.advance_expire_delta);
adjust_lapic_timer_advance(vcpu, guest_tsc - tsc_deadline);
/*
* If the timer fired early, reread the TSC to account for the
* overhead of the above adjustment to avoid waiting longer

1
arch/x86/kvm/lapic.h
View File

@ -38,7 +38,6 @@ struct kvm_timer {
u64 tscdeadline;
u64 expired_tscdeadline;
u32 timer_advance_ns;
s64 advance_expire_delta;
atomic_t pending; /* accumulated triggered timers */
bool hv_timer_in_use;
};

109
arch/x86/kvm/mmu.h
View File

@ -89,7 +89,27 @@ static inline gfn_t kvm_mmu_max_gfn(void)
return (1ULL << (max_gpa_bits - PAGE_SHIFT)) - 1;
}
static inline u8 kvm_get_shadow_phys_bits(void)
{
/*
* boot_cpu_data.x86_phys_bits is reduced when MKTME or SME are detected
* in CPU detection code, but the processor treats those reduced bits as
* 'keyID' thus they are not reserved bits. Therefore KVM needs to look at
* the physical address bits reported by CPUID.
*/
if (likely(boot_cpu_data.extended_cpuid_level >= 0x80000008))
return cpuid_eax(0x80000008) & 0xff;
/*
* Quite weird to have VMX or SVM but not MAXPHYADDR; probably a VM with
* custom CPUID. Proceed with whatever the kernel found since these features
* aren't virtualizable (SME/SEV also require CPUIDs higher than 0x80000008).
*/
return boot_cpu_data.x86_phys_bits;
}
void kvm_mmu_set_mmio_spte_mask(u64 mmio_value, u64 mmio_mask, u64 access_mask);
void kvm_mmu_set_me_spte_mask(u64 me_value, u64 me_mask);
void kvm_mmu_set_ept_masks(bool has_ad_bits, bool has_exec_only);
void kvm_init_mmu(struct kvm_vcpu *vcpu);
@ -138,94 +158,7 @@ static inline void kvm_mmu_load_pgd(struct kvm_vcpu *vcpu)
return;
static_call(kvm_x86_load_mmu_pgd)(vcpu, root_hpa,
vcpu->arch.mmu->shadow_root_level);
}
struct kvm_page_fault {
/* arguments to kvm_mmu_do_page_fault. */
const gpa_t addr;
const u32 error_code;
const bool prefetch;
/* Derived from error_code. */
const bool exec;
const bool write;
const bool present;
const bool rsvd;
const bool user;
/* Derived from mmu and global state. */
const bool is_tdp;
const bool nx_huge_page_workaround_enabled;
/*
* Whether a >4KB mapping can be created or is forbidden due to NX
* hugepages.
*/
bool huge_page_disallowed;
/*
* Maximum page size that can be created for this fault; input to
* FNAME(fetch), __direct_map and kvm_tdp_mmu_map.
*/
u8 max_level;
/*
* Page size that can be created based on the max_level and the
* page size used by the host mapping.
*/
u8 req_level;
/*
* Page size that will be created based on the req_level and
* huge_page_disallowed.
*/
u8 goal_level;
/* Shifted addr, or result of guest page table walk if addr is a gva. */
gfn_t gfn;
/* The memslot containing gfn. May be NULL. */
struct kvm_memory_slot *slot;
/* Outputs of kvm_faultin_pfn. */
kvm_pfn_t pfn;
hva_t hva;
bool map_writable;
};
int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault);
extern int nx_huge_pages;
static inline bool is_nx_huge_page_enabled(void)
{
return READ_ONCE(nx_huge_pages);
}
static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
u32 err, bool prefetch)
{
struct kvm_page_fault fault = {
.addr = cr2_or_gpa,
.error_code = err,
.exec = err & PFERR_FETCH_MASK,
.write = err & PFERR_WRITE_MASK,
.present = err & PFERR_PRESENT_MASK,
.rsvd = err & PFERR_RSVD_MASK,
.user = err & PFERR_USER_MASK,
.prefetch = prefetch,
.is_tdp = likely(vcpu->arch.mmu->page_fault == kvm_tdp_page_fault),
.nx_huge_page_workaround_enabled = is_nx_huge_page_enabled(),
.max_level = KVM_MAX_HUGEPAGE_LEVEL,
.req_level = PG_LEVEL_4K,
.goal_level = PG_LEVEL_4K,
};
#ifdef CONFIG_RETPOLINE
if (fault.is_tdp)
return kvm_tdp_page_fault(vcpu, &fault);
#endif
return vcpu->arch.mmu->page_fault(vcpu, &fault);
vcpu->arch.mmu->root_role.level);
}
/*

597
arch/x86/kvm/mmu/mmu.c
View File

File diff suppressed because it is too large Load Diff

123
arch/x86/kvm/mmu/mmu_internal.h
View File

@ -140,9 +140,72 @@ void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
u64 start_gfn, u64 pages);
unsigned int pte_list_count(struct kvm_rmap_head *rmap_head);
extern int nx_huge_pages;
static inline bool is_nx_huge_page_enabled(void)
{
return READ_ONCE(nx_huge_pages);
}
struct kvm_page_fault {
/* arguments to kvm_mmu_do_page_fault. */
const gpa_t addr;
const u32 error_code;
const bool prefetch;
/* Derived from error_code. */
const bool exec;
const bool write;
const bool present;
const bool rsvd;
const bool user;
/* Derived from mmu and global state. */
const bool is_tdp;
const bool nx_huge_page_workaround_enabled;
/*
* Whether a >4KB mapping can be created or is forbidden due to NX
* hugepages.
*/
bool huge_page_disallowed;
/*
* Maximum page size that can be created for this fault; input to
* FNAME(fetch), __direct_map and kvm_tdp_mmu_map.
*/
u8 max_level;
/*
* Page size that can be created based on the max_level and the
* page size used by the host mapping.
*/
u8 req_level;
/*
* Page size that will be created based on the req_level and
* huge_page_disallowed.
*/
u8 goal_level;
/* Shifted addr, or result of guest page table walk if addr is a gva. */
gfn_t gfn;
/* The memslot containing gfn. May be NULL. */
struct kvm_memory_slot *slot;
/* Outputs of kvm_faultin_pfn. */
kvm_pfn_t pfn;
hva_t hva;
bool map_writable;
};
int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault);
/*
* Return values of handle_mmio_page_fault, mmu.page_fault, and fast_page_fault().
* Return values of handle_mmio_page_fault(), mmu.page_fault(), fast_page_fault(),
* and of course kvm_mmu_do_page_fault().
*
* RET_PF_CONTINUE: So far, so good, keep handling the page fault.
* RET_PF_RETRY: let CPU fault again on the address.
* RET_PF_EMULATE: mmio page fault, emulate the instruction directly.
* RET_PF_INVALID: the spte is invalid, let the real page fault path update it.
@ -151,15 +214,71 @@ unsigned int pte_list_count(struct kvm_rmap_head *rmap_head);
*
* Any names added to this enum should be exported to userspace for use in
* tracepoints via TRACE_DEFINE_ENUM() in mmutrace.h
*
* Note, all values must be greater than or equal to zero so as not to encroach
* on -errno return values. Somewhat arbitrarily use '0' for CONTINUE, which
* will allow for efficient machine code when checking for CONTINUE, e.g.
* "TEST %rax, %rax, JNZ", as all "stop!" values are non-zero.
*/
enum {
RET_PF_RETRY = 0,
RET_PF_CONTINUE = 0,
RET_PF_RETRY,
RET_PF_EMULATE,
RET_PF_INVALID,
RET_PF_FIXED,
RET_PF_SPURIOUS,
};
static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
u32 err, bool prefetch)
{
struct kvm_page_fault fault = {
.addr = cr2_or_gpa,
.error_code = err,
.exec = err & PFERR_FETCH_MASK,
.write = err & PFERR_WRITE_MASK,
.present = err & PFERR_PRESENT_MASK,
.rsvd = err & PFERR_RSVD_MASK,
.user = err & PFERR_USER_MASK,
.prefetch = prefetch,
.is_tdp = likely(vcpu->arch.mmu->page_fault == kvm_tdp_page_fault),
.nx_huge_page_workaround_enabled = is_nx_huge_page_enabled(),
.max_level = KVM_MAX_HUGEPAGE_LEVEL,
.req_level = PG_LEVEL_4K,
.goal_level = PG_LEVEL_4K,
};
int r;
/*
* Async #PF "faults", a.k.a. prefetch faults, are not faults from the
* guest perspective and have already been counted at the time of the
* original fault.
*/
if (!prefetch)
vcpu->stat.pf_taken++;
if (IS_ENABLED(CONFIG_RETPOLINE) && fault.is_tdp)
r = kvm_tdp_page_fault(vcpu, &fault);
else
r = vcpu->arch.mmu->page_fault(vcpu, &fault);
/*
* Similar to above, prefetch faults aren't truly spurious, and the
* async #PF path doesn't do emulation. Do count faults that are fixed
* by the async #PF handler though, otherwise they'll never be counted.
*/
if (r == RET_PF_FIXED)
vcpu->stat.pf_fixed++;
else if (prefetch)
;
else if (r == RET_PF_EMULATE)
vcpu->stat.pf_emulate++;
else if (r == RET_PF_SPURIOUS)
vcpu->stat.pf_spurious++;
return r;
}
int kvm_mmu_max_mapping_level(struct kvm *kvm,
const struct kvm_memory_slot *slot, gfn_t gfn,
kvm_pfn_t pfn, int max_level);

1
arch/x86/kvm/mmu/mmutrace.h
View File

@ -54,6 +54,7 @@
{ PFERR_RSVD_MASK, "RSVD" }, \
{ PFERR_FETCH_MASK, "F" }
TRACE_DEFINE_ENUM(RET_PF_CONTINUE);
TRACE_DEFINE_ENUM(RET_PF_RETRY);
TRACE_DEFINE_ENUM(RET_PF_EMULATE);
TRACE_DEFINE_ENUM(RET_PF_INVALID);

71
arch/x86/kvm/mmu/paging_tmpl.h
View File

@ -63,7 +63,7 @@
#define PT_LEVEL_BITS PT64_LEVEL_BITS
#define PT_GUEST_DIRTY_SHIFT 9
#define PT_GUEST_ACCESSED_SHIFT 8
#define PT_HAVE_ACCESSED_DIRTY(mmu) ((mmu)->ept_ad)
#define PT_HAVE_ACCESSED_DIRTY(mmu) (!(mmu)->cpu_role.base.ad_disabled)
#ifdef CONFIG_X86_64
#define CMPXCHG "cmpxchgq"
#endif
@ -144,42 +144,6 @@ static bool FNAME(is_rsvd_bits_set)(struct kvm_mmu *mmu, u64 gpte, int level)
FNAME(is_bad_mt_xwr)(&mmu->guest_rsvd_check, gpte);
}
static int FNAME(cmpxchg_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
pt_element_t __user *ptep_user, unsigned index,
pt_element_t orig_pte, pt_element_t new_pte)
{
signed char r;
if (!user_access_begin(ptep_user, sizeof(pt_element_t)))
return -EFAULT;
#ifdef CMPXCHG
asm volatile("1:" LOCK_PREFIX CMPXCHG " %[new], %[ptr]\n"
"setnz %b[r]\n"
"2:"
_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %k[r])
: [ptr] "+m" (*ptep_user),
[old] "+a" (orig_pte),
[r] "=q" (r)
: [new] "r" (new_pte)
: "memory");
#else
asm volatile("1:" LOCK_PREFIX "cmpxchg8b %[ptr]\n"
"setnz %b[r]\n"
"2:"
_ASM_EXTABLE_TYPE_REG(1b, 2b, EX_TYPE_EFAULT_REG, %k[r])
: [ptr] "+m" (*ptep_user),
[old] "+A" (orig_pte),
[r] "=q" (r)
: [new_lo] "b" ((u32)new_pte),
[new_hi] "c" ((u32)(new_pte >> 32))
: "memory");
#endif
user_access_end();
return r;
}
static bool FNAME(prefetch_invalid_gpte)(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp, u64 *spte,
u64 gpte)
@ -187,7 +151,7 @@ static bool FNAME(prefetch_invalid_gpte)(struct kvm_vcpu *vcpu,
if (!FNAME(is_present_gpte)(gpte))
goto no_present;
/* if accessed bit is not supported prefetch non accessed gpte */
/* Prefetch only accessed entries (unless A/D bits are disabled). */
if (PT_HAVE_ACCESSED_DIRTY(vcpu->arch.mmu) &&
!(gpte & PT_GUEST_ACCESSED_MASK))
goto no_present;
@ -278,7 +242,7 @@ static int FNAME(update_accessed_dirty_bits)(struct kvm_vcpu *vcpu,
if (unlikely(!walker->pte_writable[level - 1]))
continue;
ret = FNAME(cmpxchg_gpte)(vcpu, mmu, ptep_user, index, orig_pte, pte);
ret = __try_cmpxchg_user(ptep_user, &orig_pte, pte, fault);
if (ret)
return ret;
@ -317,7 +281,7 @@ static inline bool FNAME(is_last_gpte)(struct kvm_mmu *mmu,
* is not reserved and does not indicate a large page at this level,
* so clear PT_PAGE_SIZE_MASK in gpte if that is the case.
*/
gpte &= level - (PT32_ROOT_LEVEL + mmu->mmu_role.ext.cr4_pse);
gpte &= level - (PT32_ROOT_LEVEL + mmu->cpu_role.ext.cr4_pse);
#endif
/*
* PG_LEVEL_4K always terminates. The RHS has bit 7 set
@ -355,7 +319,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
trace_kvm_mmu_pagetable_walk(addr, access);
retry_walk:
walker->level = mmu->root_level;
walker->level = mmu->cpu_role.base.level;
pte = mmu->get_guest_pgd(vcpu);
have_ad = PT_HAVE_ACCESSED_DIRTY(mmu);
@ -515,14 +479,21 @@ error:
* The other bits are set to 0.
*/
if (!(errcode & PFERR_RSVD_MASK)) {
vcpu->arch.exit_qualification &= 0x180;
vcpu->arch.exit_qualification &= (EPT_VIOLATION_GVA_IS_VALID |
EPT_VIOLATION_GVA_TRANSLATED);
if (write_fault)
vcpu->arch.exit_qualification |= EPT_VIOLATION_ACC_WRITE;
if (user_fault)
vcpu->arch.exit_qualification |= EPT_VIOLATION_ACC_READ;
if (fetch_fault)
vcpu->arch.exit_qualification |= EPT_VIOLATION_ACC_INSTR;
vcpu->arch.exit_qualification |= (pte_access & 0x7) << 3;
/*
* Note, pte_access holds the raw RWX bits from the EPTE, not
* ACC_*_MASK flags!
*/
vcpu->arch.exit_qualification |= (pte_access & VMX_EPT_RWX_MASK) <<
EPT_VIOLATION_RWX_SHIFT;
}
#endif
walker->fault.address = addr;
@ -650,7 +621,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
WARN_ON_ONCE(gw->gfn != base_gfn);
direct_access = gw->pte_access;
top_level = vcpu->arch.mmu->root_level;
top_level = vcpu->arch.mmu->cpu_role.base.level;
if (top_level == PT32E_ROOT_LEVEL)
top_level = PT32_ROOT_LEVEL;
/*
@ -752,7 +723,6 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
return ret;
FNAME(pte_prefetch)(vcpu, gw, it.sptep);
++vcpu->stat.pf_fixed;
return ret;
out_gpte_changed:
@ -867,10 +837,12 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault
mmu_seq = vcpu->kvm->mmu_notifier_seq;
smp_rmb();
if (kvm_faultin_pfn(vcpu, fault, &r))
r = kvm_faultin_pfn(vcpu, fault);
if (r != RET_PF_CONTINUE)
return r;
if (handle_abnormal_pfn(vcpu, fault, walker.pte_access, &r))
r = handle_abnormal_pfn(vcpu, fault, walker.pte_access);
if (r != RET_PF_CONTINUE)
return r;
/*
@ -1017,7 +989,7 @@ static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
*/
static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
{
union kvm_mmu_page_role mmu_role = vcpu->arch.mmu->mmu_role.base;
union kvm_mmu_page_role root_role = vcpu->arch.mmu->root_role;
int i;
bool host_writable;
gpa_t first_pte_gpa;
@ -1036,6 +1008,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
.level = 0xf,
.access = 0x7,
.quadrant = 0x3,
.passthrough = 0x1,
};
/*
@ -1045,7 +1018,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
* reserved bits checks will be wrong, etc...
*/
if (WARN_ON_ONCE(sp->role.direct ||
(sp->role.word ^ mmu_role.word) & ~sync_role_ign.word))
(sp->role.word ^ root_role.word) & ~sync_role_ign.word))
return -1;
first_pte_gpa = FNAME(get_level1_sp_gpa)(sp);

47
arch/x86/kvm/mmu/spte.c
View File

@ -19,7 +19,7 @@
#include <asm/memtype.h>
#include <asm/vmx.h>
static bool __read_mostly enable_mmio_caching = true;
bool __read_mostly enable_mmio_caching = true;
module_param_named(mmio_caching, enable_mmio_caching, bool, 0444);
u64 __read_mostly shadow_host_writable_mask;
@ -33,6 +33,7 @@ u64 __read_mostly shadow_mmio_value;
u64 __read_mostly shadow_mmio_mask;
u64 __read_mostly shadow_mmio_access_mask;
u64 __read_mostly shadow_present_mask;
u64 __read_mostly shadow_me_value;
u64 __read_mostly shadow_me_mask;
u64 __read_mostly shadow_acc_track_mask;
@ -167,8 +168,8 @@ bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
else
pte_access &= ~ACC_WRITE_MASK;
if (!kvm_is_mmio_pfn(pfn))
spte |= shadow_me_mask;
if (shadow_me_value && !kvm_is_mmio_pfn(pfn))
spte |= shadow_me_value;
spte |= (u64)pfn << PAGE_SHIFT;
@ -284,7 +285,7 @@ u64 make_nonleaf_spte(u64 *child_pt, bool ad_disabled)
u64 spte = SPTE_MMU_PRESENT_MASK;
spte |= __pa(child_pt) | shadow_present_mask | PT_WRITABLE_MASK |
shadow_user_mask | shadow_x_mask | shadow_me_mask;
shadow_user_mask | shadow_x_mask | shadow_me_value;
if (ad_disabled)
spte |= SPTE_TDP_AD_DISABLED_MASK;
@ -310,25 +311,6 @@ u64 kvm_mmu_changed_pte_notifier_make_spte(u64 old_spte, kvm_pfn_t new_pfn)
return new_spte;
}
static u8 kvm_get_shadow_phys_bits(void)
{
/*
* boot_cpu_data.x86_phys_bits is reduced when MKTME or SME are detected
* in CPU detection code, but the processor treats those reduced bits as
* 'keyID' thus they are not reserved bits. Therefore KVM needs to look at
* the physical address bits reported by CPUID.
*/
if (likely(boot_cpu_data.extended_cpuid_level >= 0x80000008))
return cpuid_eax(0x80000008) & 0xff;
/*
* Quite weird to have VMX or SVM but not MAXPHYADDR; probably a VM with
* custom CPUID. Proceed with whatever the kernel found since these features
* aren't virtualizable (SME/SEV also require CPUIDs higher than 0x80000008).
*/
return boot_cpu_data.x86_phys_bits;
}
u64 mark_spte_for_access_track(u64 spte)
{
if (spte_ad_enabled(spte))
@ -379,12 +361,26 @@ void kvm_mmu_set_mmio_spte_mask(u64 mmio_value, u64 mmio_mask, u64 access_mask)
WARN_ON(mmio_value && (REMOVED_SPTE & mmio_mask) == mmio_value))
mmio_value = 0;
if (!mmio_value)
enable_mmio_caching = false;
shadow_mmio_value = mmio_value;
shadow_mmio_mask = mmio_mask;
shadow_mmio_access_mask = access_mask;
}
EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask);
void kvm_mmu_set_me_spte_mask(u64 me_value, u64 me_mask)
{
/* shadow_me_value must be a subset of shadow_me_mask */
if (WARN_ON(me_value & ~me_mask))
me_value = me_mask = 0;
shadow_me_value = me_value;
shadow_me_mask = me_mask;
}
EXPORT_SYMBOL_GPL(kvm_mmu_set_me_spte_mask);
void kvm_mmu_set_ept_masks(bool has_ad_bits, bool has_exec_only)
{
shadow_user_mask = VMX_EPT_READABLE_MASK;
@ -394,8 +390,6 @@ void kvm_mmu_set_ept_masks(bool has_ad_bits, bool has_exec_only)
shadow_x_mask = VMX_EPT_EXECUTABLE_MASK;
shadow_present_mask = has_exec_only ? 0ull : VMX_EPT_READABLE_MASK;
shadow_acc_track_mask = VMX_EPT_RWX_MASK;
shadow_me_mask = 0ull;
shadow_host_writable_mask = EPT_SPTE_HOST_WRITABLE;
shadow_mmu_writable_mask = EPT_SPTE_MMU_WRITABLE;
@ -446,7 +440,8 @@ void kvm_mmu_reset_all_pte_masks(void)
shadow_x_mask = 0;
shadow_present_mask = PT_PRESENT_MASK;
shadow_acc_track_mask = 0;
shadow_me_mask = sme_me_mask;
shadow_me_mask = 0;
shadow_me_value = 0;
shadow_host_writable_mask = DEFAULT_SPTE_HOST_WRITABLE;
shadow_mmu_writable_mask = DEFAULT_SPTE_MMU_WRITABLE;

16
arch/x86/kvm/mmu/spte.h
View File

@ -5,6 +5,8 @@
#include "mmu_internal.h"
extern bool __read_mostly enable_mmio_caching;
/*
* A MMU present SPTE is backed by actual memory and may or may not be present
* in hardware. E.g. MMIO SPTEs are not considered present. Use bit 11, as it
@ -149,6 +151,7 @@ extern u64 __read_mostly shadow_mmio_value;
extern u64 __read_mostly shadow_mmio_mask;
extern u64 __read_mostly shadow_mmio_access_mask;
extern u64 __read_mostly shadow_present_mask;
extern u64 __read_mostly shadow_me_value;
extern u64 __read_mostly shadow_me_mask;
/*
@ -204,7 +207,7 @@ extern u64 __read_mostly shadow_nonpresent_or_rsvd_lower_gfn_mask;
static inline bool is_mmio_spte(u64 spte)
{
return (spte & shadow_mmio_mask) == shadow_mmio_value &&
likely(shadow_mmio_value);
likely(enable_mmio_caching);
}
static inline bool is_shadow_present_pte(u64 pte)
@ -212,6 +215,17 @@ static inline bool is_shadow_present_pte(u64 pte)
return !!(pte & SPTE_MMU_PRESENT_MASK);
}
/*
* Returns true if A/D bits are supported in hardware and are enabled by KVM.
* When enabled, KVM uses A/D bits for all non-nested MMUs. Because L1 can
* disable A/D bits in EPTP12, SP and SPTE variants are needed to handle the
* scenario where KVM is using A/D bits for L1, but not L2.
*/
static inline bool kvm_ad_enabled(void)
{
return !!shadow_accessed_mask;
}
static inline bool sp_ad_disabled(struct kvm_mmu_page *sp)
{
return sp->role.ad_disabled;

14
arch/x86/kvm/mmu/tdp_mmu.c
View File

@ -310,7 +310,7 @@ static void tdp_mmu_init_child_sp(struct kvm_mmu_page *child_sp,
hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu)
{
union kvm_mmu_page_role role = vcpu->arch.mmu->mmu_role.base;
union kvm_mmu_page_role role = vcpu->arch.mmu->root_role;
struct kvm *kvm = vcpu->kvm;
struct kvm_mmu_page *root;
@ -1100,6 +1100,7 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu,
/* If a MMIO SPTE is installed, the MMIO will need to be emulated. */
if (unlikely(is_mmio_spte(new_spte))) {
vcpu->stat.pf_mmio_spte_created++;
trace_mark_mmio_spte(rcu_dereference(iter->sptep), iter->gfn,
new_spte);
ret = RET_PF_EMULATE;
@ -1108,13 +1109,6 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu,
rcu_dereference(iter->sptep));
}
/*
* Increase pf_fixed in both RET_PF_EMULATE and RET_PF_FIXED to be
* consistent with legacy MMU behavior.
*/
if (ret != RET_PF_SPURIOUS)
vcpu->stat.pf_fixed++;
return ret;
}
@ -1136,7 +1130,7 @@ static int tdp_mmu_link_sp(struct kvm *kvm, struct tdp_iter *iter,
struct kvm_mmu_page *sp, bool account_nx,
bool shared)
{
u64 spte = make_nonleaf_spte(sp->spt, !shadow_accessed_mask);
u64 spte = make_nonleaf_spte(sp->spt, !kvm_ad_enabled());
int ret = 0;
if (shared) {
@ -1859,7 +1853,7 @@ int kvm_tdp_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes,
gfn_t gfn = addr >> PAGE_SHIFT;
int leaf = -1;
*root_level = vcpu->arch.mmu->shadow_root_level;
*root_level = vcpu->arch.mmu->root_role.level;
tdp_mmu_for_each_pte(iter, mmu, gfn, gfn + 1) {
leaf = iter.level;

66
arch/x86/kvm/pmu.c
View File

@ -49,6 +49,32 @@
* * AMD: [0 .. AMD64_NUM_COUNTERS-1] <=> gp counters
*/
static struct kvm_pmu_ops kvm_pmu_ops __read_mostly;
#define KVM_X86_PMU_OP(func) \
DEFINE_STATIC_CALL_NULL(kvm_x86_pmu_##func, \
*(((struct kvm_pmu_ops *)0)->func));
#define KVM_X86_PMU_OP_OPTIONAL KVM_X86_PMU_OP
#include <asm/kvm-x86-pmu-ops.h>
void kvm_pmu_ops_update(const struct kvm_pmu_ops *pmu_ops)
{
memcpy(&kvm_pmu_ops, pmu_ops, sizeof(kvm_pmu_ops));
#define __KVM_X86_PMU_OP(func) \
static_call_update(kvm_x86_pmu_##func, kvm_pmu_ops.func);
#define KVM_X86_PMU_OP(func) \
WARN_ON(!kvm_pmu_ops.func); __KVM_X86_PMU_OP(func)
#define KVM_X86_PMU_OP_OPTIONAL __KVM_X86_PMU_OP
#include <asm/kvm-x86-pmu-ops.h>
#undef __KVM_X86_PMU_OP
}
static inline bool pmc_is_enabled(struct kvm_pmc *pmc)
{
return static_call(kvm_x86_pmu_pmc_is_enabled)(pmc);
}
static void kvm_pmi_trigger_fn(struct irq_work *irq_work)
{
struct kvm_pmu *pmu = container_of(irq_work, struct kvm_pmu, irq_work);
@ -216,7 +242,7 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
ARCH_PERFMON_EVENTSEL_CMASK |
HSW_IN_TX |
HSW_IN_TX_CHECKPOINTED))) {
config = kvm_x86_ops.pmu_ops->pmc_perf_hw_id(pmc);
config = static_call(kvm_x86_pmu_pmc_perf_hw_id)(pmc);
if (config != PERF_COUNT_HW_MAX)
type = PERF_TYPE_HARDWARE;
}
@ -266,7 +292,7 @@ void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx)
pmc->current_config = (u64)ctrl;
pmc_reprogram_counter(pmc, PERF_TYPE_HARDWARE,
kvm_x86_ops.pmu_ops->pmc_perf_hw_id(pmc),
static_call(kvm_x86_pmu_pmc_perf_hw_id)(pmc),
!(en_field & 0x2), /* exclude user */
!(en_field & 0x1), /* exclude kernel */
pmi);
@ -275,7 +301,7 @@ EXPORT_SYMBOL_GPL(reprogram_fixed_counter);
void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx)
{
struct kvm_pmc *pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, pmc_idx);
struct kvm_pmc *pmc = static_call(kvm_x86_pmu_pmc_idx_to_pmc)(pmu, pmc_idx);
if (!pmc)
return;
@ -297,7 +323,7 @@ void kvm_pmu_handle_event(struct kvm_vcpu *vcpu)
int bit;
for_each_set_bit(bit, pmu->reprogram_pmi, X86_PMC_IDX_MAX) {
struct kvm_pmc *pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, bit);
struct kvm_pmc *pmc = static_call(kvm_x86_pmu_pmc_idx_to_pmc)(pmu, bit);
if (unlikely(!pmc || !pmc->perf_event)) {
clear_bit(bit, pmu->reprogram_pmi);
@ -319,7 +345,7 @@ void kvm_pmu_handle_event(struct kvm_vcpu *vcpu)
/* check if idx is a valid index to access PMU */
bool kvm_pmu_is_valid_rdpmc_ecx(struct kvm_vcpu *vcpu, unsigned int idx)
{
return kvm_x86_ops.pmu_ops->is_valid_rdpmc_ecx(vcpu, idx);
return static_call(kvm_x86_pmu_is_valid_rdpmc_ecx)(vcpu, idx);
}
bool is_vmware_backdoor_pmc(u32 pmc_idx)
@ -369,7 +395,7 @@ int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
if (is_vmware_backdoor_pmc(idx))
return kvm_pmu_rdpmc_vmware(vcpu, idx, data);
pmc = kvm_x86_ops.pmu_ops->rdpmc_ecx_to_pmc(vcpu, idx, &mask);
pmc = static_call(kvm_x86_pmu_rdpmc_ecx_to_pmc)(vcpu, idx, &mask);
if (!pmc)
return 1;
@ -385,22 +411,21 @@ int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data)
void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu)
{
if (lapic_in_kernel(vcpu)) {
if (kvm_x86_ops.pmu_ops->deliver_pmi)
kvm_x86_ops.pmu_ops->deliver_pmi(vcpu);
static_call_cond(kvm_x86_pmu_deliver_pmi)(vcpu);
kvm_apic_local_deliver(vcpu->arch.apic, APIC_LVTPC);
}
}
bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
{
return kvm_x86_ops.pmu_ops->msr_idx_to_pmc(vcpu, msr) ||
kvm_x86_ops.pmu_ops->is_valid_msr(vcpu, msr);
return static_call(kvm_x86_pmu_msr_idx_to_pmc)(vcpu, msr) ||
static_call(kvm_x86_pmu_is_valid_msr)(vcpu, msr);
}
static void kvm_pmu_mark_pmc_in_use(struct kvm_vcpu *vcpu, u32 msr)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
struct kvm_pmc *pmc = kvm_x86_ops.pmu_ops->msr_idx_to_pmc(vcpu, msr);
struct kvm_pmc *pmc = static_call(kvm_x86_pmu_msr_idx_to_pmc)(vcpu, msr);
if (pmc)
__set_bit(pmc->idx, pmu->pmc_in_use);
@ -408,13 +433,13 @@ static void kvm_pmu_mark_pmc_in_use(struct kvm_vcpu *vcpu, u32 msr)
int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
return kvm_x86_ops.pmu_ops->get_msr(vcpu, msr_info);
return static_call(kvm_x86_pmu_get_msr)(vcpu, msr_info);
}
int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
kvm_pmu_mark_pmc_in_use(vcpu, msr_info->index);
return kvm_x86_ops.pmu_ops->set_msr(vcpu, msr_info);
return static_call(kvm_x86_pmu_set_msr)(vcpu, msr_info);
}
/* refresh PMU settings. This function generally is called when underlying
@ -423,7 +448,7 @@ int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
*/
void kvm_pmu_refresh(struct kvm_vcpu *vcpu)
{
kvm_x86_ops.pmu_ops->refresh(vcpu);
static_call(kvm_x86_pmu_refresh)(vcpu);
}
void kvm_pmu_reset(struct kvm_vcpu *vcpu)
@ -431,7 +456,7 @@ void kvm_pmu_reset(struct kvm_vcpu *vcpu)
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
irq_work_sync(&pmu->irq_work);
kvm_x86_ops.pmu_ops->reset(vcpu);
static_call(kvm_x86_pmu_reset)(vcpu);
}
void kvm_pmu_init(struct kvm_vcpu *vcpu)
@ -439,7 +464,7 @@ void kvm_pmu_init(struct kvm_vcpu *vcpu)
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
memset(pmu, 0, sizeof(*pmu));
kvm_x86_ops.pmu_ops->init(vcpu);
static_call(kvm_x86_pmu_init)(vcpu);
init_irq_work(&pmu->irq_work, kvm_pmi_trigger_fn);
pmu->event_count = 0;
pmu->need_cleanup = false;
@ -471,14 +496,13 @@ void kvm_pmu_cleanup(struct kvm_vcpu *vcpu)
pmu->pmc_in_use, X86_PMC_IDX_MAX);
for_each_set_bit(i, bitmask, X86_PMC_IDX_MAX) {
pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, i);
pmc = static_call(kvm_x86_pmu_pmc_idx_to_pmc)(pmu, i);
if (pmc && pmc->perf_event && !pmc_speculative_in_use(pmc))
pmc_stop_counter(pmc);
}
if (kvm_x86_ops.pmu_ops->cleanup)
kvm_x86_ops.pmu_ops->cleanup(vcpu);
static_call_cond(kvm_x86_pmu_cleanup)(vcpu);
bitmap_zero(pmu->pmc_in_use, X86_PMC_IDX_MAX);
}
@ -508,7 +532,7 @@ static inline bool eventsel_match_perf_hw_id(struct kvm_pmc *pmc,
unsigned int config;
pmc->eventsel &= (ARCH_PERFMON_EVENTSEL_EVENT | ARCH_PERFMON_EVENTSEL_UMASK);
config = kvm_x86_ops.pmu_ops->pmc_perf_hw_id(pmc);
config = static_call(kvm_x86_pmu_pmc_perf_hw_id)(pmc);
pmc->eventsel = old_eventsel;
return config == perf_hw_id;
}
@ -536,7 +560,7 @@ void kvm_pmu_trigger_event(struct kvm_vcpu *vcpu, u64 perf_hw_id)
int i;
for_each_set_bit(i, pmu->all_valid_pmc_idx, X86_PMC_IDX_MAX) {
pmc = kvm_x86_ops.pmu_ops->pmc_idx_to_pmc(pmu, i);
pmc = static_call(kvm_x86_pmu_pmc_idx_to_pmc)(pmu, i);
if (!pmc || !pmc_is_enabled(pmc) || !pmc_speculative_in_use(pmc))
continue;

7
arch/x86/kvm/pmu.h
View File

@ -39,6 +39,8 @@ struct kvm_pmu_ops {
void (*cleanup)(struct kvm_vcpu *vcpu);
};
void kvm_pmu_ops_update(const struct kvm_pmu_ops *pmu_ops);
static inline u64 pmc_bitmask(struct kvm_pmc *pmc)
{
struct kvm_pmu *pmu = pmc_to_pmu(pmc);
@ -86,11 +88,6 @@ static inline bool pmc_is_fixed(struct kvm_pmc *pmc)
return pmc->type == KVM_PMC_FIXED;
}
static inline bool pmc_is_enabled(struct kvm_pmc *pmc)
{
return kvm_x86_ops.pmu_ops->pmc_is_enabled(pmc);
}
static inline bool kvm_valid_perf_global_ctrl(struct kvm_pmu *pmu,
u64 data)
{

84
arch/x86/kvm/svm/avic.c
View File

@ -165,9 +165,8 @@ free_avic:
return err;
}
void avic_init_vmcb(struct vcpu_svm *svm)
void avic_init_vmcb(struct vcpu_svm *svm, struct vmcb *vmcb)
{
struct vmcb *vmcb = svm->vmcb;
struct kvm_svm *kvm_svm = to_kvm_svm(svm->vcpu.kvm);
phys_addr_t bpa = __sme_set(page_to_phys(svm->avic_backing_page));
phys_addr_t lpa = __sme_set(page_to_phys(kvm_svm->avic_logical_id_table_page));
@ -285,11 +284,77 @@ void avic_ring_doorbell(struct kvm_vcpu *vcpu)
put_cpu();
}
static void avic_kick_target_vcpus(struct kvm *kvm, struct kvm_lapic *source,
u32 icrl, u32 icrh)
/*
* A fast-path version of avic_kick_target_vcpus(), which attempts to match
* destination APIC ID to vCPU without looping through all vCPUs.
*/
static int avic_kick_target_vcpus_fast(struct kvm *kvm, struct kvm_lapic *source,
u32 icrl, u32 icrh, u32 index)
{
u32 dest, apic_id;
struct kvm_vcpu *vcpu;
int dest_mode = icrl & APIC_DEST_MASK;
int shorthand = icrl & APIC_SHORT_MASK;
struct kvm_svm *kvm_svm = to_kvm_svm(kvm);
u32 *avic_logical_id_table = page_address(kvm_svm->avic_logical_id_table_page);
if (shorthand != APIC_DEST_NOSHORT)
return -EINVAL;
/*
* The AVIC incomplete IPI #vmexit info provides index into
* the physical APIC ID table, which can be used to derive
* guest physical APIC ID.
*/
if (dest_mode == APIC_DEST_PHYSICAL) {
apic_id = index;
} else {
if (!apic_x2apic_mode(source)) {
/* For xAPIC logical mode, the index is for logical APIC table. */
apic_id = avic_logical_id_table[index] & 0x1ff;
} else {
return -EINVAL;
}
}
/*
* Assuming vcpu ID is the same as physical apic ID,
* and use it to retrieve the target vCPU.
*/
vcpu = kvm_get_vcpu_by_id(kvm, apic_id);
if (!vcpu)
return -EINVAL;
if (apic_x2apic_mode(vcpu->arch.apic))
dest = icrh;
else
dest = GET_APIC_DEST_FIELD(icrh);
/*
* Try matching the destination APIC ID with the vCPU.
*/
if (kvm_apic_match_dest(vcpu, source, shorthand, dest, dest_mode)) {
vcpu->arch.apic->irr_pending = true;
svm_complete_interrupt_delivery(vcpu,
icrl & APIC_MODE_MASK,
icrl & APIC_INT_LEVELTRIG,
icrl & APIC_VECTOR_MASK);
return 0;
}
return -EINVAL;
}
static void avic_kick_target_vcpus(struct kvm *kvm, struct kvm_lapic *source,
u32 icrl, u32 icrh, u32 index)
{
unsigned long i;
struct kvm_vcpu *vcpu;
if (!avic_kick_target_vcpus_fast(kvm, source, icrl, icrh, index))
return;
trace_kvm_avic_kick_vcpu_slowpath(icrh, icrl, index);
/*
* Wake any target vCPUs that are blocking, i.e. waiting for a wake
@ -316,7 +381,7 @@ int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu)
u32 icrh = svm->vmcb->control.exit_info_1 >> 32;
u32 icrl = svm->vmcb->control.exit_info_1;
u32 id = svm->vmcb->control.exit_info_2 >> 32;
u32 index = svm->vmcb->control.exit_info_2 & 0xFF;
u32 index = svm->vmcb->control.exit_info_2 & 0x1FF;
struct kvm_lapic *apic = vcpu->arch.apic;
trace_kvm_avic_incomplete_ipi(vcpu->vcpu_id, icrh, icrl, id, index);
@ -343,7 +408,7 @@ int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu)
* set the appropriate IRR bits on the valid target
* vcpus. So, we just need to kick the appropriate vcpu.
*/
avic_kick_target_vcpus(vcpu->kvm, apic, icrl, icrh);
avic_kick_target_vcpus(vcpu->kvm, apic, icrl, icrh, index);
break;
case AVIC_IPI_FAILURE_INVALID_TARGET:
break;
@ -357,6 +422,13 @@ int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu)
return 1;
}
unsigned long avic_vcpu_get_apicv_inhibit_reasons(struct kvm_vcpu *vcpu)
{
if (is_guest_mode(vcpu))
return APICV_INHIBIT_REASON_NESTED;
return 0;
}
static u32 *avic_get_logical_id_entry(struct kvm_vcpu *vcpu, u32 ldr, bool flat)
{
struct kvm_svm *kvm_svm = to_kvm_svm(vcpu->kvm);

306
arch/x86/kvm/svm/nested.c
View File

@ -36,40 +36,45 @@ static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb *vmcb = svm->vmcb;
if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) {
if (vmcb->control.exit_code != SVM_EXIT_NPF) {
/*
* TODO: track the cause of the nested page fault, and
* correctly fill in the high bits of exit_info_1.
*/
svm->vmcb->control.exit_code = SVM_EXIT_NPF;
svm->vmcb->control.exit_code_hi = 0;
svm->vmcb->control.exit_info_1 = (1ULL << 32);
svm->vmcb->control.exit_info_2 = fault->address;
vmcb->control.exit_code = SVM_EXIT_NPF;
vmcb->control.exit_code_hi = 0;
vmcb->control.exit_info_1 = (1ULL << 32);
vmcb->control.exit_info_2 = fault->address;
}
svm->vmcb->control.exit_info_1 &= ~0xffffffffULL;
svm->vmcb->control.exit_info_1 |= fault->error_code;
vmcb->control.exit_info_1 &= ~0xffffffffULL;
vmcb->control.exit_info_1 |= fault->error_code;
nested_svm_vmexit(svm);
}
static void svm_inject_page_fault_nested(struct kvm_vcpu *vcpu, struct x86_exception *fault)
static bool nested_svm_handle_page_fault_workaround(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
{
struct vcpu_svm *svm = to_svm(vcpu);
WARN_ON(!is_guest_mode(vcpu));
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb *vmcb = svm->vmcb;
WARN_ON(!is_guest_mode(vcpu));
if (vmcb12_is_intercept(&svm->nested.ctl,
INTERCEPT_EXCEPTION_OFFSET + PF_VECTOR) &&
!svm->nested.nested_run_pending) {
svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + PF_VECTOR;
svm->vmcb->control.exit_code_hi = 0;
svm->vmcb->control.exit_info_1 = fault->error_code;
svm->vmcb->control.exit_info_2 = fault->address;
nested_svm_vmexit(svm);
} else {
kvm_inject_page_fault(vcpu, fault);
}
!WARN_ON_ONCE(svm->nested.nested_run_pending)) {
vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + PF_VECTOR;
vmcb->control.exit_code_hi = 0;
vmcb->control.exit_info_1 = fault->error_code;
vmcb->control.exit_info_2 = fault->address;
nested_svm_vmexit(svm);
return true;
}
return false;
}
static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
@ -121,6 +126,20 @@ static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
}
static bool nested_vmcb_needs_vls_intercept(struct vcpu_svm *svm)
{
if (!svm->v_vmload_vmsave_enabled)
return true;
if (!nested_npt_enabled(svm))
return true;
if (!(svm->nested.ctl.virt_ext & VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK))
return true;
return false;
}
void recalc_intercepts(struct vcpu_svm *svm)
{
struct vmcb_control_area *c, *h;
@ -162,8 +181,17 @@ void recalc_intercepts(struct vcpu_svm *svm)
if (!intercept_smi)
vmcb_clr_intercept(c, INTERCEPT_SMI);
vmcb_set_intercept(c, INTERCEPT_VMLOAD);
vmcb_set_intercept(c, INTERCEPT_VMSAVE);
if (nested_vmcb_needs_vls_intercept(svm)) {
/*
* If the virtual VMLOAD/VMSAVE is not enabled for the L2,
* we must intercept these instructions to correctly
* emulate them in case L1 doesn't intercept them.
*/
vmcb_set_intercept(c, INTERCEPT_VMLOAD);
vmcb_set_intercept(c, INTERCEPT_VMSAVE);
} else {
WARN_ON(!(c->virt_ext & VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK));
}
}
/*
@ -413,6 +441,10 @@ void nested_sync_control_from_vmcb02(struct vcpu_svm *svm)
*/
mask &= ~V_IRQ_MASK;
}
if (nested_vgif_enabled(svm))
mask |= V_GIF_MASK;
svm->nested.ctl.int_ctl &= ~mask;
svm->nested.ctl.int_ctl |= svm->vmcb->control.int_ctl & mask;
}
@ -454,11 +486,6 @@ static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm,
vmcb12->control.exit_int_info = exit_int_info;
}
static inline bool nested_npt_enabled(struct vcpu_svm *svm)
{
return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE;
}
static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu)
{
/*
@ -515,6 +542,8 @@ void nested_vmcb02_compute_g_pat(struct vcpu_svm *svm)
static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12)
{
bool new_vmcb12 = false;
struct vmcb *vmcb01 = svm->vmcb01.ptr;
struct vmcb *vmcb02 = svm->nested.vmcb02.ptr;
nested_vmcb02_compute_g_pat(svm);
@ -526,18 +555,18 @@ static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12
}
if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_SEG))) {
svm->vmcb->save.es = vmcb12->save.es;
svm->vmcb->save.cs = vmcb12->save.cs;
svm->vmcb->save.ss = vmcb12->save.ss;
svm->vmcb->save.ds = vmcb12->save.ds;
svm->vmcb->save.cpl = vmcb12->save.cpl;
vmcb_mark_dirty(svm->vmcb, VMCB_SEG);
vmcb02->save.es = vmcb12->save.es;
vmcb02->save.cs = vmcb12->save.cs;
vmcb02->save.ss = vmcb12->save.ss;
vmcb02->save.ds = vmcb12->save.ds;
vmcb02->save.cpl = vmcb12->save.cpl;
vmcb_mark_dirty(vmcb02, VMCB_SEG);
}
if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DT))) {
svm->vmcb->save.gdtr = vmcb12->save.gdtr;
svm->vmcb->save.idtr = vmcb12->save.idtr;
vmcb_mark_dirty(svm->vmcb, VMCB_DT);
vmcb02->save.gdtr = vmcb12->save.gdtr;
vmcb02->save.idtr = vmcb12->save.idtr;
vmcb_mark_dirty(vmcb02, VMCB_DT);
}
kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED);
@ -554,47 +583,59 @@ static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12
kvm_rip_write(&svm->vcpu, vmcb12->save.rip);
/* In case we don't even reach vcpu_run, the fields are not updated */
svm->vmcb->save.rax = vmcb12->save.rax;
svm->vmcb->save.rsp = vmcb12->save.rsp;
svm->vmcb->save.rip = vmcb12->save.rip;
vmcb02->save.rax = vmcb12->save.rax;
vmcb02->save.rsp = vmcb12->save.rsp;
vmcb02->save.rip = vmcb12->save.rip;
/* These bits will be set properly on the first execution when new_vmc12 is true */
if (unlikely(new_vmcb12 || vmcb_is_dirty(vmcb12, VMCB_DR))) {
svm->vmcb->save.dr7 = svm->nested.save.dr7 | DR7_FIXED_1;
vmcb02->save.dr7 = svm->nested.save.dr7 | DR7_FIXED_1;
svm->vcpu.arch.dr6 = svm->nested.save.dr6 | DR6_ACTIVE_LOW;
vmcb_mark_dirty(svm->vmcb, VMCB_DR);
vmcb_mark_dirty(vmcb02, VMCB_DR);
}
if (unlikely(svm->lbrv_enabled && (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
/*
* Reserved bits of DEBUGCTL are ignored. Be consistent with
* svm_set_msr's definition of reserved bits.
*/
svm_copy_lbrs(vmcb02, vmcb12);
vmcb02->save.dbgctl &= ~DEBUGCTL_RESERVED_BITS;
svm_update_lbrv(&svm->vcpu);
} else if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) {
svm_copy_lbrs(vmcb02, vmcb01);
}
}
static void nested_vmcb02_prepare_control(struct vcpu_svm *svm)
{
const u32 int_ctl_vmcb01_bits =
V_INTR_MASKING_MASK | V_GIF_MASK | V_GIF_ENABLE_MASK;
const u32 int_ctl_vmcb12_bits = V_TPR_MASK | V_IRQ_INJECTION_BITS_MASK;
u32 int_ctl_vmcb01_bits = V_INTR_MASKING_MASK;
u32 int_ctl_vmcb12_bits = V_TPR_MASK | V_IRQ_INJECTION_BITS_MASK;
struct kvm_vcpu *vcpu = &svm->vcpu;
struct vmcb *vmcb01 = svm->vmcb01.ptr;
struct vmcb *vmcb02 = svm->nested.vmcb02.ptr;
/*
* Filled at exit: exit_code, exit_code_hi, exit_info_1, exit_info_2,
* exit_int_info, exit_int_info_err, next_rip, insn_len, insn_bytes.
*/
/*
* Also covers avic_vapic_bar, avic_backing_page, avic_logical_id,
* avic_physical_id.
*/
WARN_ON(kvm_apicv_activated(svm->vcpu.kvm));
if (svm->vgif_enabled && (svm->nested.ctl.int_ctl & V_GIF_ENABLE_MASK))
int_ctl_vmcb12_bits |= (V_GIF_MASK | V_GIF_ENABLE_MASK);
else
int_ctl_vmcb01_bits |= (V_GIF_MASK | V_GIF_ENABLE_MASK);
/* Copied from vmcb01. msrpm_base can be overwritten later. */
svm->vmcb->control.nested_ctl = svm->vmcb01.ptr->control.nested_ctl;
svm->vmcb->control.iopm_base_pa = svm->vmcb01.ptr->control.iopm_base_pa;
svm->vmcb->control.msrpm_base_pa = svm->vmcb01.ptr->control.msrpm_base_pa;
vmcb02->control.nested_ctl = vmcb01->control.nested_ctl;
vmcb02->control.iopm_base_pa = vmcb01->control.iopm_base_pa;
vmcb02->control.msrpm_base_pa = vmcb01->control.msrpm_base_pa;
/* Done at vmrun: asid. */
/* Also overwritten later if necessary. */
svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
vmcb02->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
/* nested_cr3. */
if (nested_npt_enabled(svm))
@ -605,21 +646,53 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm)
svm->nested.ctl.tsc_offset,
svm->tsc_ratio_msr);
svm->vmcb->control.tsc_offset = vcpu->arch.tsc_offset;
vmcb02->control.tsc_offset = vcpu->arch.tsc_offset;
if (svm->tsc_ratio_msr != kvm_default_tsc_scaling_ratio) {
WARN_ON(!svm->tsc_scaling_enabled);
nested_svm_update_tsc_ratio_msr(vcpu);
}
svm->vmcb->control.int_ctl =
vmcb02->control.int_ctl =
(svm->nested.ctl.int_ctl & int_ctl_vmcb12_bits) |
(svm->vmcb01.ptr->control.int_ctl & int_ctl_vmcb01_bits);
(vmcb01->control.int_ctl & int_ctl_vmcb01_bits);
svm->vmcb->control.int_vector = svm->nested.ctl.int_vector;
svm->vmcb->control.int_state = svm->nested.ctl.int_state;
svm->vmcb->control.event_inj = svm->nested.ctl.event_inj;
svm->vmcb->control.event_inj_err = svm->nested.ctl.event_inj_err;
vmcb02->control.int_vector = svm->nested.ctl.int_vector;
vmcb02->control.int_state = svm->nested.ctl.int_state;
vmcb02->control.event_inj = svm->nested.ctl.event_inj;
vmcb02->control.event_inj_err = svm->nested.ctl.event_inj_err;
vmcb02->control.virt_ext = vmcb01->control.virt_ext &
LBR_CTL_ENABLE_MASK;
if (svm->lbrv_enabled)
vmcb02->control.virt_ext |=
(svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK);
if (!nested_vmcb_needs_vls_intercept(svm))
vmcb02->control.virt_ext |= VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK;
if (kvm_pause_in_guest(svm->vcpu.kvm)) {
/* use guest values since host doesn't use them */
vmcb02->control.pause_filter_count =
svm->pause_filter_enabled ?
svm->nested.ctl.pause_filter_count : 0;
vmcb02->control.pause_filter_thresh =
svm->pause_threshold_enabled ?
svm->nested.ctl.pause_filter_thresh : 0;
} else if (!vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_PAUSE)) {
/* use host values when guest doesn't use them */
vmcb02->control.pause_filter_count = vmcb01->control.pause_filter_count;
vmcb02->control.pause_filter_thresh = vmcb01->control.pause_filter_thresh;
} else {
/*
* Intercept every PAUSE otherwise and
* ignore both host and guest values
*/
vmcb02->control.pause_filter_count = 0;
vmcb02->control.pause_filter_thresh = 0;
}
nested_svm_transition_tlb_flush(vcpu);
@ -680,14 +753,14 @@ int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa,
if (ret)
return ret;
if (!npt_enabled)
vcpu->arch.mmu->inject_page_fault = svm_inject_page_fault_nested;
if (!from_vmrun)
kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
svm_set_gif(svm, true);
if (kvm_vcpu_apicv_active(vcpu))
kvm_make_request(KVM_REQ_APICV_UPDATE, vcpu);
return 0;
}
@ -698,6 +771,7 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu)
struct vmcb *vmcb12;
struct kvm_host_map map;
u64 vmcb12_gpa;
struct vmcb *vmcb01 = svm->vmcb01.ptr;
if (!svm->nested.hsave_msr) {
kvm_inject_gp(vcpu, 0);
@ -741,14 +815,14 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu)
* Since vmcb01 is not in use, we can use it to store some of the L1
* state.
*/
svm->vmcb01.ptr->save.efer = vcpu->arch.efer;
svm->vmcb01.ptr->save.cr0 = kvm_read_cr0(vcpu);
svm->vmcb01.ptr->save.cr4 = vcpu->arch.cr4;
svm->vmcb01.ptr->save.rflags = kvm_get_rflags(vcpu);
svm->vmcb01.ptr->save.rip = kvm_rip_read(vcpu);
vmcb01->save.efer = vcpu->arch.efer;
vmcb01->save.cr0 = kvm_read_cr0(vcpu);
vmcb01->save.cr4 = vcpu->arch.cr4;
vmcb01->save.rflags = kvm_get_rflags(vcpu);
vmcb01->save.rip = kvm_rip_read(vcpu);
if (!npt_enabled)
svm->vmcb01.ptr->save.cr3 = kvm_read_cr3(vcpu);
vmcb01->save.cr3 = kvm_read_cr3(vcpu);
svm->nested.nested_run_pending = 1;
@ -814,14 +888,12 @@ void svm_copy_vmloadsave_state(struct vmcb *to_vmcb, struct vmcb *from_vmcb)
int nested_svm_vmexit(struct vcpu_svm *svm)
{
struct kvm_vcpu *vcpu = &svm->vcpu;
struct vmcb *vmcb01 = svm->vmcb01.ptr;
struct vmcb *vmcb02 = svm->nested.vmcb02.ptr;
struct vmcb *vmcb12;
struct vmcb *vmcb = svm->vmcb;
struct kvm_host_map map;
int rc;
/* Triple faults in L2 should never escape. */
WARN_ON_ONCE(kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu));
rc = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.vmcb12_gpa), &map);
if (rc) {
if (rc == -EINVAL)
@ -843,57 +915,68 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
/* Give the current vmcb to the guest */
vmcb12->save.es = vmcb->save.es;
vmcb12->save.cs = vmcb->save.cs;
vmcb12->save.ss = vmcb->save.ss;
vmcb12->save.ds = vmcb->save.ds;
vmcb12->save.gdtr = vmcb->save.gdtr;
vmcb12->save.idtr = vmcb->save.idtr;
vmcb12->save.es = vmcb02->save.es;
vmcb12->save.cs = vmcb02->save.cs;
vmcb12->save.ss = vmcb02->save.ss;
vmcb12->save.ds = vmcb02->save.ds;
vmcb12->save.gdtr = vmcb02->save.gdtr;
vmcb12->save.idtr = vmcb02->save.idtr;
vmcb12->save.efer = svm->vcpu.arch.efer;
vmcb12->save.cr0 = kvm_read_cr0(vcpu);
vmcb12->save.cr3 = kvm_read_cr3(vcpu);
vmcb12->save.cr2 = vmcb->save.cr2;
vmcb12->save.cr2 = vmcb02->save.cr2;
vmcb12->save.cr4 = svm->vcpu.arch.cr4;
vmcb12->save.rflags = kvm_get_rflags(vcpu);
vmcb12->save.rip = kvm_rip_read(vcpu);
vmcb12->save.rsp = kvm_rsp_read(vcpu);
vmcb12->save.rax = kvm_rax_read(vcpu);
vmcb12->save.dr7 = vmcb->save.dr7;
vmcb12->save.dr7 = vmcb02->save.dr7;
vmcb12->save.dr6 = svm->vcpu.arch.dr6;
vmcb12->save.cpl = vmcb->save.cpl;
vmcb12->save.cpl = vmcb02->save.cpl;
vmcb12->control.int_state = vmcb->control.int_state;
vmcb12->control.exit_code = vmcb->control.exit_code;
vmcb12->control.exit_code_hi = vmcb->control.exit_code_hi;
vmcb12->control.exit_info_1 = vmcb->control.exit_info_1;
vmcb12->control.exit_info_2 = vmcb->control.exit_info_2;
vmcb12->control.int_state = vmcb02->control.int_state;
vmcb12->control.exit_code = vmcb02->control.exit_code;
vmcb12->control.exit_code_hi = vmcb02->control.exit_code_hi;
vmcb12->control.exit_info_1 = vmcb02->control.exit_info_1;
vmcb12->control.exit_info_2 = vmcb02->control.exit_info_2;
if (vmcb12->control.exit_code != SVM_EXIT_ERR)
nested_save_pending_event_to_vmcb12(svm, vmcb12);
if (svm->nrips_enabled)
vmcb12->control.next_rip = vmcb->control.next_rip;
vmcb12->control.next_rip = vmcb02->control.next_rip;
vmcb12->control.int_ctl = svm->nested.ctl.int_ctl;
vmcb12->control.tlb_ctl = svm->nested.ctl.tlb_ctl;
vmcb12->control.event_inj = svm->nested.ctl.event_inj;
vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err;
if (!kvm_pause_in_guest(vcpu->kvm) && vmcb02->control.pause_filter_count)
vmcb01->control.pause_filter_count = vmcb02->control.pause_filter_count;
nested_svm_copy_common_state(svm->nested.vmcb02.ptr, svm->vmcb01.ptr);
svm_switch_vmcb(svm, &svm->vmcb01);
if (unlikely(svm->lbrv_enabled && (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
svm_copy_lbrs(vmcb12, vmcb02);
svm_update_lbrv(vcpu);
} else if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) {
svm_copy_lbrs(vmcb01, vmcb02);
svm_update_lbrv(vcpu);
}
/*
* On vmexit the GIF is set to false and
* no event can be injected in L1.
*/
svm_set_gif(svm, false);
svm->vmcb->control.exit_int_info = 0;
vmcb01->control.exit_int_info = 0;
svm->vcpu.arch.tsc_offset = svm->vcpu.arch.l1_tsc_offset;
if (svm->vmcb->control.tsc_offset != svm->vcpu.arch.tsc_offset) {
svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset;
vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
if (vmcb01->control.tsc_offset != svm->vcpu.arch.tsc_offset) {
vmcb01->control.tsc_offset = svm->vcpu.arch.tsc_offset;
vmcb_mark_dirty(vmcb01, VMCB_INTERCEPTS);
}
if (svm->tsc_ratio_msr != kvm_default_tsc_scaling_ratio) {
@ -907,13 +990,13 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
/*
* Restore processor state that had been saved in vmcb01
*/
kvm_set_rflags(vcpu, svm->vmcb->save.rflags);
svm_set_efer(vcpu, svm->vmcb->save.efer);
svm_set_cr0(vcpu, svm->vmcb->save.cr0 | X86_CR0_PE);
svm_set_cr4(vcpu, svm->vmcb->save.cr4);
kvm_rax_write(vcpu, svm->vmcb->save.rax);
kvm_rsp_write(vcpu, svm->vmcb->save.rsp);
kvm_rip_write(vcpu, svm->vmcb->save.rip);
kvm_set_rflags(vcpu, vmcb01->save.rflags);
svm_set_efer(vcpu, vmcb01->save.efer);
svm_set_cr0(vcpu, vmcb01->save.cr0 | X86_CR0_PE);
svm_set_cr4(vcpu, vmcb01->save.cr4);
kvm_rax_write(vcpu, vmcb01->save.rax);
kvm_rsp_write(vcpu, vmcb01->save.rsp);
kvm_rip_write(vcpu, vmcb01->save.rip);
svm->vcpu.arch.dr7 = DR7_FIXED_1;
kvm_update_dr7(&svm->vcpu);
@ -931,7 +1014,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
nested_svm_uninit_mmu_context(vcpu);
rc = nested_svm_load_cr3(vcpu, svm->vmcb->save.cr3, false, true);
rc = nested_svm_load_cr3(vcpu, vmcb01->save.cr3, false, true);
if (rc)
return 1;
@ -949,9 +1032,16 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
* right now so that it an be accounted for before we execute
* L1's next instruction.
*/
if (unlikely(svm->vmcb->save.rflags & X86_EFLAGS_TF))
if (unlikely(vmcb01->save.rflags & X86_EFLAGS_TF))
kvm_queue_exception(&(svm->vcpu), DB_VECTOR);
/*
* Un-inhibit the AVIC right away, so that other vCPUs can start
* to benefit from it right away.
*/
if (kvm_apicv_activated(vcpu->kvm))
kvm_vcpu_update_apicv(vcpu);
return 0;
}
@ -1162,12 +1252,13 @@ static bool nested_exit_on_exception(struct vcpu_svm *svm)
static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm)
{
unsigned int nr = svm->vcpu.arch.exception.nr;
struct vmcb *vmcb = svm->vmcb;
svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
svm->vmcb->control.exit_code_hi = 0;
vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
vmcb->control.exit_code_hi = 0;
if (svm->vcpu.arch.exception.has_error_code)
svm->vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code;
vmcb->control.exit_info_1 = svm->vcpu.arch.exception.error_code;
/*
* EXITINFO2 is undefined for all exception intercepts other
@ -1175,11 +1266,11 @@ static void nested_svm_inject_exception_vmexit(struct vcpu_svm *svm)
*/
if (nr == PF_VECTOR) {
if (svm->vcpu.arch.exception.nested_apf)
svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
else if (svm->vcpu.arch.exception.has_payload)
svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload;
vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload;
else
svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
} else if (nr == DB_VECTOR) {
/* See inject_pending_event. */
kvm_deliver_exception_payload(&svm->vcpu);
@ -1567,6 +1658,7 @@ static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu)
struct kvm_x86_nested_ops svm_nested_ops = {
.leave_nested = svm_leave_nested,
.check_events = svm_check_nested_events,
.handle_page_fault_workaround = nested_svm_handle_page_fault_workaround,
.triple_fault = nested_svm_triple_fault,
.get_nested_state_pages = svm_get_nested_state_pages,
.get_state = svm_get_nested_state,

2
arch/x86/kvm/svm/pmu.c
View File

@ -342,7 +342,7 @@ static void amd_pmu_reset(struct kvm_vcpu *vcpu)
}
}
struct kvm_pmu_ops amd_pmu_ops = {
struct kvm_pmu_ops amd_pmu_ops __initdata = {
.pmc_perf_hw_id = amd_pmc_perf_hw_id,
.pmc_is_enabled = amd_pmc_is_enabled,
.pmc_idx_to_pmc = amd_pmc_idx_to_pmc,

28
arch/x86/kvm/svm/sev.c
View File

@ -688,7 +688,7 @@ static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
if (params.len > SEV_FW_BLOB_MAX_SIZE)
return -EINVAL;
blob = kmalloc(params.len, GFP_KERNEL_ACCOUNT);
blob = kzalloc(params.len, GFP_KERNEL_ACCOUNT);
if (!blob)
return -ENOMEM;
@ -808,7 +808,7 @@ static int __sev_dbg_decrypt_user(struct kvm *kvm, unsigned long paddr,
if (!IS_ALIGNED(dst_paddr, 16) ||
!IS_ALIGNED(paddr, 16) ||
!IS_ALIGNED(size, 16)) {
tpage = (void *)alloc_page(GFP_KERNEL);
tpage = (void *)alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!tpage)
return -ENOMEM;
@ -1094,7 +1094,7 @@ static int sev_get_attestation_report(struct kvm *kvm, struct kvm_sev_cmd *argp)
if (params.len > SEV_FW_BLOB_MAX_SIZE)
return -EINVAL;
blob = kmalloc(params.len, GFP_KERNEL_ACCOUNT);
blob = kzalloc(params.len, GFP_KERNEL_ACCOUNT);
if (!blob)
return -ENOMEM;
@ -1176,7 +1176,7 @@ static int sev_send_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
return -EINVAL;
/* allocate the memory to hold the session data blob */
session_data = kmalloc(params.session_len, GFP_KERNEL_ACCOUNT);
session_data = kzalloc(params.session_len, GFP_KERNEL_ACCOUNT);
if (!session_data)
return -ENOMEM;
@ -1300,11 +1300,11 @@ static int sev_send_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
/* allocate memory for header and transport buffer */
ret = -ENOMEM;
hdr = kmalloc(params.hdr_len, GFP_KERNEL_ACCOUNT);
hdr = kzalloc(params.hdr_len, GFP_KERNEL_ACCOUNT);
if (!hdr)
goto e_unpin;
trans_data = kmalloc(params.trans_len, GFP_KERNEL_ACCOUNT);
trans_data = kzalloc(params.trans_len, GFP_KERNEL_ACCOUNT);
if (!trans_data)
goto e_free_hdr;
@ -2769,8 +2769,12 @@ static int sev_handle_vmgexit_msr_protocol(struct vcpu_svm *svm)
pr_info("SEV-ES guest requested termination: %#llx:%#llx\n",
reason_set, reason_code);
ret = -EINVAL;
break;
vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
vcpu->run->system_event.type = KVM_SYSTEM_EVENT_SEV_TERM;
vcpu->run->system_event.ndata = 1;
vcpu->run->system_event.data[0] = control->ghcb_gpa;
return 0;
}
default:
/* Error, keep GHCB MSR value as-is */
@ -2953,6 +2957,14 @@ void sev_es_init_vmcb(struct vcpu_svm *svm)
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
if (boot_cpu_has(X86_FEATURE_V_TSC_AUX) &&
(guest_cpuid_has(&svm->vcpu, X86_FEATURE_RDTSCP) ||
guest_cpuid_has(&svm->vcpu, X86_FEATURE_RDPID))) {
set_msr_interception(vcpu, svm->msrpm, MSR_TSC_AUX, 1, 1);
if (guest_cpuid_has(&svm->vcpu, X86_FEATURE_RDTSCP))
svm_clr_intercept(svm, INTERCEPT_RDTSCP);
}
}
void sev_es_vcpu_reset(struct vcpu_svm *svm)

215
arch/x86/kvm/svm/svm.c
View File

@ -62,8 +62,6 @@ MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id);
#define SEG_TYPE_LDT 2
#define SEG_TYPE_BUSY_TSS16 3
#define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
static bool erratum_383_found __read_mostly;
u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
@ -101,6 +99,7 @@ static const struct svm_direct_access_msrs {
{ .index = MSR_EFER, .always = false },
{ .index = MSR_IA32_CR_PAT, .always = false },
{ .index = MSR_AMD64_SEV_ES_GHCB, .always = true },
{ .index = MSR_TSC_AUX, .always = false },
{ .index = MSR_INVALID, .always = false },
};
@ -172,7 +171,7 @@ static int vls = true;
module_param(vls, int, 0444);
/* enable/disable Virtual GIF */
static int vgif = true;
int vgif = true;
module_param(vgif, int, 0444);
/* enable/disable LBR virtualization */
@ -189,6 +188,9 @@ module_param(tsc_scaling, int, 0444);
static bool avic;
module_param(avic, bool, 0444);
static bool force_avic;
module_param_unsafe(force_avic, bool, 0444);
bool __read_mostly dump_invalid_vmcb;
module_param(dump_invalid_vmcb, bool, 0644);
@ -790,6 +792,17 @@ static void init_msrpm_offsets(void)
}
}
void svm_copy_lbrs(struct vmcb *to_vmcb, struct vmcb *from_vmcb)
{
to_vmcb->save.dbgctl = from_vmcb->save.dbgctl;
to_vmcb->save.br_from = from_vmcb->save.br_from;
to_vmcb->save.br_to = from_vmcb->save.br_to;
to_vmcb->save.last_excp_from = from_vmcb->save.last_excp_from;
to_vmcb->save.last_excp_to = from_vmcb->save.last_excp_to;
vmcb_mark_dirty(to_vmcb, VMCB_LBR);
}
static void svm_enable_lbrv(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@ -799,6 +812,10 @@ static void svm_enable_lbrv(struct kvm_vcpu *vcpu)
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
/* Move the LBR msrs to the vmcb02 so that the guest can see them. */
if (is_guest_mode(vcpu))
svm_copy_lbrs(svm->vmcb, svm->vmcb01.ptr);
}
static void svm_disable_lbrv(struct kvm_vcpu *vcpu)
@ -810,6 +827,67 @@ static void svm_disable_lbrv(struct kvm_vcpu *vcpu)
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
/*
* Move the LBR msrs back to the vmcb01 to avoid copying them
* on nested guest entries.
*/
if (is_guest_mode(vcpu))
svm_copy_lbrs(svm->vmcb01.ptr, svm->vmcb);
}
static int svm_get_lbr_msr(struct vcpu_svm *svm, u32 index)
{
/*
* If the LBR virtualization is disabled, the LBR msrs are always
* kept in the vmcb01 to avoid copying them on nested guest entries.
*
* If nested, and the LBR virtualization is enabled/disabled, the msrs
* are moved between the vmcb01 and vmcb02 as needed.
*/
struct vmcb *vmcb =
(svm->vmcb->control.virt_ext & LBR_CTL_ENABLE_MASK) ?
svm->vmcb : svm->vmcb01.ptr;
switch (index) {
case MSR_IA32_DEBUGCTLMSR:
return vmcb->save.dbgctl;
case MSR_IA32_LASTBRANCHFROMIP:
return vmcb->save.br_from;
case MSR_IA32_LASTBRANCHTOIP:
return vmcb->save.br_to;
case MSR_IA32_LASTINTFROMIP:
return vmcb->save.last_excp_from;
case MSR_IA32_LASTINTTOIP:
return vmcb->save.last_excp_to;
default:
KVM_BUG(false, svm->vcpu.kvm,
"%s: Unknown MSR 0x%x", __func__, index);
return 0;
}
}
void svm_update_lbrv(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
bool enable_lbrv = svm_get_lbr_msr(svm, MSR_IA32_DEBUGCTLMSR) &
DEBUGCTLMSR_LBR;
bool current_enable_lbrv = !!(svm->vmcb->control.virt_ext &
LBR_CTL_ENABLE_MASK);
if (unlikely(is_guest_mode(vcpu) && svm->lbrv_enabled))
if (unlikely(svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))
enable_lbrv = true;
if (enable_lbrv == current_enable_lbrv)
return;
if (enable_lbrv)
svm_enable_lbrv(vcpu);
else
svm_disable_lbrv(vcpu);
}
void disable_nmi_singlestep(struct vcpu_svm *svm)
@ -831,6 +909,9 @@ static void grow_ple_window(struct kvm_vcpu *vcpu)
struct vmcb_control_area *control = &svm->vmcb->control;
int old = control->pause_filter_count;
if (kvm_pause_in_guest(vcpu->kvm) || !old)
return;
control->pause_filter_count = __grow_ple_window(old,
pause_filter_count,
pause_filter_count_grow,
@ -849,6 +930,9 @@ static void shrink_ple_window(struct kvm_vcpu *vcpu)
struct vmcb_control_area *control = &svm->vmcb->control;
int old = control->pause_filter_count;
if (kvm_pause_in_guest(vcpu->kvm) || !old)
return;
control->pause_filter_count =
__shrink_ple_window(old,
pause_filter_count,
@ -960,6 +1044,8 @@ static inline void init_vmcb_after_set_cpuid(struct kvm_vcpu *vcpu)
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SYSENTER_EIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SYSENTER_ESP, 0, 0);
svm->v_vmload_vmsave_enabled = false;
} else {
/*
* If hardware supports Virtual VMLOAD VMSAVE then enable it
@ -979,8 +1065,9 @@ static inline void init_vmcb_after_set_cpuid(struct kvm_vcpu *vcpu)
static void init_vmcb(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb_control_area *control = &svm->vmcb->control;
struct vmcb_save_area *save = &svm->vmcb->save;
struct vmcb *vmcb = svm->vmcb01.ptr;
struct vmcb_control_area *control = &vmcb->control;
struct vmcb_save_area *save = &vmcb->save;
svm_set_intercept(svm, INTERCEPT_CR0_READ);
svm_set_intercept(svm, INTERCEPT_CR3_READ);
@ -1104,7 +1191,7 @@ static void init_vmcb(struct kvm_vcpu *vcpu)
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SPEC_CTRL, 1, 1);
if (kvm_vcpu_apicv_active(vcpu))
avic_init_vmcb(svm);
avic_init_vmcb(svm, vmcb);
if (vgif) {
svm_clr_intercept(svm, INTERCEPT_STGI);
@ -1122,10 +1209,10 @@ static void init_vmcb(struct kvm_vcpu *vcpu)
}
}
svm_hv_init_vmcb(svm->vmcb);
svm_hv_init_vmcb(vmcb);
init_vmcb_after_set_cpuid(vcpu);
vmcb_mark_all_dirty(svm->vmcb);
vmcb_mark_all_dirty(vmcb);
enable_gif(svm);
}
@ -1380,7 +1467,7 @@ static void svm_set_vintr(struct vcpu_svm *svm)
/*
* The following fields are ignored when AVIC is enabled
*/
WARN_ON(kvm_apicv_activated(svm->vcpu.kvm));
WARN_ON(kvm_vcpu_apicv_activated(&svm->vcpu));
svm_set_intercept(svm, INTERCEPT_VINTR);
@ -2142,7 +2229,7 @@ void svm_set_gif(struct vcpu_svm *svm, bool value)
* Likewise, clear the VINTR intercept, we will set it
* again while processing KVM_REQ_EVENT if needed.
*/
if (vgif_enabled(svm))
if (vgif)
svm_clr_intercept(svm, INTERCEPT_STGI);
if (svm_is_intercept(svm, INTERCEPT_VINTR))
svm_clear_vintr(svm);
@ -2160,7 +2247,7 @@ void svm_set_gif(struct vcpu_svm *svm, bool value)
* in use, we still rely on the VINTR intercept (rather than
* STGI) to detect an open interrupt window.
*/
if (!vgif_enabled(svm))
if (!vgif)
svm_clear_vintr(svm);
}
}
@ -2575,25 +2662,12 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
case MSR_TSC_AUX:
msr_info->data = svm->tsc_aux;
break;
/*
* Nobody will change the following 5 values in the VMCB so we can
* safely return them on rdmsr. They will always be 0 until LBRV is
* implemented.
*/
case MSR_IA32_DEBUGCTLMSR:
msr_info->data = svm->vmcb->save.dbgctl;
break;
case MSR_IA32_LASTBRANCHFROMIP:
msr_info->data = svm->vmcb->save.br_from;
break;
case MSR_IA32_LASTBRANCHTOIP:
msr_info->data = svm->vmcb->save.br_to;
break;
case MSR_IA32_LASTINTFROMIP:
msr_info->data = svm->vmcb->save.last_excp_from;
break;
case MSR_IA32_LASTINTTOIP:
msr_info->data = svm->vmcb->save.last_excp_to;
msr_info->data = svm_get_lbr_msr(svm, msr_info->index);
break;
case MSR_VM_HSAVE_PA:
msr_info->data = svm->nested.hsave_msr;
@ -2839,12 +2913,13 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
if (data & DEBUGCTL_RESERVED_BITS)
return 1;
svm->vmcb->save.dbgctl = data;
vmcb_mark_dirty(svm->vmcb, VMCB_LBR);
if (data & (1ULL<<0))
svm_enable_lbrv(vcpu);
if (svm->vmcb->control.virt_ext & LBR_CTL_ENABLE_MASK)
svm->vmcb->save.dbgctl = data;
else
svm_disable_lbrv(vcpu);
svm->vmcb01.ptr->save.dbgctl = data;
svm_update_lbrv(vcpu);
break;
case MSR_VM_HSAVE_PA:
/*
@ -2901,9 +2976,16 @@ static int interrupt_window_interception(struct kvm_vcpu *vcpu)
svm_clear_vintr(to_svm(vcpu));
/*
* For AVIC, the only reason to end up here is ExtINTs.
* If not running nested, for AVIC, the only reason to end up here is ExtINTs.
* In this case AVIC was temporarily disabled for
* requesting the IRQ window and we have to re-enable it.
*
* If running nested, still remove the VM wide AVIC inhibit to
* support case in which the interrupt window was requested when the
* vCPU was not running nested.
* All vCPUs which run still run nested, will remain to have their
* AVIC still inhibited due to per-cpu AVIC inhibition.
*/
kvm_clear_apicv_inhibit(vcpu->kvm, APICV_INHIBIT_REASON_IRQWIN);
@ -2914,7 +2996,6 @@ static int interrupt_window_interception(struct kvm_vcpu *vcpu)
static int pause_interception(struct kvm_vcpu *vcpu)
{
bool in_kernel;
/*
* CPL is not made available for an SEV-ES guest, therefore
* vcpu->arch.preempted_in_kernel can never be true. Just
@ -2922,8 +3003,7 @@ static int pause_interception(struct kvm_vcpu *vcpu)
*/
in_kernel = !sev_es_guest(vcpu->kvm) && svm_get_cpl(vcpu) == 0;
if (!kvm_pause_in_guest(vcpu->kvm))
grow_ple_window(vcpu);
grow_ple_window(vcpu);
kvm_vcpu_on_spin(vcpu, in_kernel);
return kvm_skip_emulated_instruction(vcpu);
@ -3496,14 +3576,20 @@ static void svm_enable_irq_window(struct kvm_vcpu *vcpu)
* enabled, the STGI interception will not occur. Enable the irq
* window under the assumption that the hardware will set the GIF.
*/
if (vgif_enabled(svm) || gif_set(svm)) {
if (vgif || gif_set(svm)) {
/*
* IRQ window is not needed when AVIC is enabled,
* unless we have pending ExtINT since it cannot be injected
* via AVIC. In such case, we need to temporarily disable AVIC,
* via AVIC. In such case, KVM needs to temporarily disable AVIC,
* and fallback to injecting IRQ via V_IRQ.
*
* If running nested, AVIC is already locally inhibited
* on this vCPU, therefore there is no need to request
* the VM wide AVIC inhibition.
*/
kvm_set_apicv_inhibit(vcpu->kvm, APICV_INHIBIT_REASON_IRQWIN);
if (!is_guest_mode(vcpu))
kvm_set_apicv_inhibit(vcpu->kvm, APICV_INHIBIT_REASON_IRQWIN);
svm_set_vintr(svm);
}
}
@ -3516,7 +3602,7 @@ static void svm_enable_nmi_window(struct kvm_vcpu *vcpu)
return; /* IRET will cause a vm exit */
if (!gif_set(svm)) {
if (vgif_enabled(svm))
if (vgif)
svm_set_intercept(svm, INTERCEPT_STGI);
return; /* STGI will cause a vm exit */
}
@ -3865,7 +3951,7 @@ static void svm_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa,
hv_track_root_tdp(vcpu, root_hpa);
cr3 = vcpu->arch.cr3;
} else if (vcpu->arch.mmu->shadow_root_level >= PT64_ROOT_4LEVEL) {
} else if (vcpu->arch.mmu->root_role.level >= PT64_ROOT_4LEVEL) {
cr3 = __sme_set(root_hpa) | kvm_get_active_pcid(vcpu);
} else {
/* PCID in the guest should be impossible with a 32-bit MMU. */
@ -3946,6 +4032,17 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
guest_cpuid_has(vcpu, X86_FEATURE_NRIPS);
svm->tsc_scaling_enabled = tsc_scaling && guest_cpuid_has(vcpu, X86_FEATURE_TSCRATEMSR);
svm->lbrv_enabled = lbrv && guest_cpuid_has(vcpu, X86_FEATURE_LBRV);
svm->v_vmload_vmsave_enabled = vls && guest_cpuid_has(vcpu, X86_FEATURE_V_VMSAVE_VMLOAD);
svm->pause_filter_enabled = kvm_cpu_cap_has(X86_FEATURE_PAUSEFILTER) &&
guest_cpuid_has(vcpu, X86_FEATURE_PAUSEFILTER);
svm->pause_threshold_enabled = kvm_cpu_cap_has(X86_FEATURE_PFTHRESHOLD) &&
guest_cpuid_has(vcpu, X86_FEATURE_PFTHRESHOLD);
svm->vgif_enabled = vgif && guest_cpuid_has(vcpu, X86_FEATURE_VGIF);
svm_recalc_instruction_intercepts(vcpu, svm);
@ -3963,13 +4060,6 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
*/
if (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC))
kvm_set_apicv_inhibit(kvm, APICV_INHIBIT_REASON_X2APIC);
/*
* Currently, AVIC does not work with nested virtualization.
* So, we disable AVIC when cpuid for SVM is set in the L1 guest.
*/
if (nested && guest_cpuid_has(vcpu, X86_FEATURE_SVM))
kvm_set_apicv_inhibit(kvm, APICV_INHIBIT_REASON_NESTED);
}
init_vmcb_after_set_cpuid(vcpu);
}
@ -4224,7 +4314,7 @@ static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];
ret = nested_svm_vmexit(svm);
ret = nested_svm_simple_vmexit(svm, SVM_EXIT_SW);
if (ret)
return ret;
@ -4321,7 +4411,7 @@ static void svm_enable_smi_window(struct kvm_vcpu *vcpu)
struct vcpu_svm *svm = to_svm(vcpu);
if (!gif_set(svm)) {
if (vgif_enabled(svm))
if (vgif)
svm_set_intercept(svm, INTERCEPT_STGI);
/* STGI will cause a vm exit */
} else {
@ -4605,7 +4695,6 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.sched_in = svm_sched_in,
.pmu_ops = &amd_pmu_ops,
.nested_ops = &svm_nested_ops,
.deliver_interrupt = svm_deliver_interrupt,
@ -4633,6 +4722,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.complete_emulated_msr = svm_complete_emulated_msr,
.vcpu_deliver_sipi_vector = svm_vcpu_deliver_sipi_vector,
.vcpu_get_apicv_inhibit_reasons = avic_vcpu_get_apicv_inhibit_reasons,
};
/*
@ -4696,6 +4786,20 @@ static __init void svm_set_cpu_caps(void)
if (tsc_scaling)
kvm_cpu_cap_set(X86_FEATURE_TSCRATEMSR);
if (vls)
kvm_cpu_cap_set(X86_FEATURE_V_VMSAVE_VMLOAD);
if (lbrv)
kvm_cpu_cap_set(X86_FEATURE_LBRV);
if (boot_cpu_has(X86_FEATURE_PAUSEFILTER))
kvm_cpu_cap_set(X86_FEATURE_PAUSEFILTER);
if (boot_cpu_has(X86_FEATURE_PFTHRESHOLD))
kvm_cpu_cap_set(X86_FEATURE_PFTHRESHOLD);
if (vgif)
kvm_cpu_cap_set(X86_FEATURE_VGIF);
/* Nested VM can receive #VMEXIT instead of triggering #GP */
kvm_cpu_cap_set(X86_FEATURE_SVME_ADDR_CHK);
}
@ -4789,6 +4893,9 @@ static __init int svm_hardware_setup(void)
get_npt_level(), PG_LEVEL_1G);
pr_info("kvm: Nested Paging %sabled\n", npt_enabled ? "en" : "dis");
/* Setup shadow_me_value and shadow_me_mask */
kvm_mmu_set_me_spte_mask(sme_me_mask, sme_me_mask);
/* Note, SEV setup consumes npt_enabled. */
sev_hardware_setup();
@ -4807,15 +4914,20 @@ static __init int svm_hardware_setup(void)
nrips = false;
}
enable_apicv = avic = avic && npt_enabled && boot_cpu_has(X86_FEATURE_AVIC);
enable_apicv = avic = avic && npt_enabled && (boot_cpu_has(X86_FEATURE_AVIC) || force_avic);
if (enable_apicv) {
pr_info("AVIC enabled\n");
if (!boot_cpu_has(X86_FEATURE_AVIC)) {
pr_warn("AVIC is not supported in CPUID but force enabled");
pr_warn("Your system might crash and burn");
} else
pr_info("AVIC enabled\n");
amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
} else {
svm_x86_ops.vcpu_blocking = NULL;
svm_x86_ops.vcpu_unblocking = NULL;
svm_x86_ops.vcpu_get_apicv_inhibit_reasons = NULL;
}
if (vls) {
@ -4880,6 +4992,7 @@ static struct kvm_x86_init_ops svm_init_ops __initdata = {
.check_processor_compatibility = svm_check_processor_compat,
.runtime_ops = &svm_x86_ops,
.pmu_ops = &amd_pmu_ops,
};
static int __init svm_init(void)

55
arch/x86/kvm/svm/svm.h
View File

@ -29,10 +29,11 @@
#define IOPM_SIZE PAGE_SIZE * 3
#define MSRPM_SIZE PAGE_SIZE * 2
#define MAX_DIRECT_ACCESS_MSRS 20
#define MAX_DIRECT_ACCESS_MSRS 21
#define MSRPM_OFFSETS 16
extern u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
extern bool npt_enabled;
extern int vgif;
extern bool intercept_smi;
/*
@ -231,9 +232,14 @@ struct vcpu_svm {
unsigned int3_injected;
unsigned long int3_rip;
/* cached guest cpuid flags for faster access */
/* optional nested SVM features that are enabled for this guest */
bool nrips_enabled : 1;
bool tsc_scaling_enabled : 1;
bool v_vmload_vmsave_enabled : 1;
bool lbrv_enabled : 1;
bool pause_filter_enabled : 1;
bool pause_threshold_enabled : 1;
bool vgif_enabled : 1;
u32 ldr_reg;
u32 dfr_reg;
@ -452,44 +458,70 @@ static inline bool svm_is_intercept(struct vcpu_svm *svm, int bit)
return vmcb_is_intercept(&svm->vmcb->control, bit);
}
static inline bool vgif_enabled(struct vcpu_svm *svm)
static inline bool nested_vgif_enabled(struct vcpu_svm *svm)
{
return !!(svm->vmcb->control.int_ctl & V_GIF_ENABLE_MASK);
return svm->vgif_enabled && (svm->nested.ctl.int_ctl & V_GIF_ENABLE_MASK);
}
static inline struct vmcb *get_vgif_vmcb(struct vcpu_svm *svm)
{
if (!vgif)
return NULL;
if (is_guest_mode(&svm->vcpu) && !nested_vgif_enabled(svm))
return svm->nested.vmcb02.ptr;
else
return svm->vmcb01.ptr;
}
static inline void enable_gif(struct vcpu_svm *svm)
{
if (vgif_enabled(svm))
svm->vmcb->control.int_ctl |= V_GIF_MASK;
struct vmcb *vmcb = get_vgif_vmcb(svm);
if (vmcb)
vmcb->control.int_ctl |= V_GIF_MASK;
else
svm->vcpu.arch.hflags |= HF_GIF_MASK;
}
static inline void disable_gif(struct vcpu_svm *svm)
{
if (vgif_enabled(svm))
svm->vmcb->control.int_ctl &= ~V_GIF_MASK;
struct vmcb *vmcb = get_vgif_vmcb(svm);
if (vmcb)
vmcb->control.int_ctl &= ~V_GIF_MASK;
else
svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
}
static inline bool gif_set(struct vcpu_svm *svm)
{
if (vgif_enabled(svm))
return !!(svm->vmcb->control.int_ctl & V_GIF_MASK);
struct vmcb *vmcb = get_vgif_vmcb(svm);
if (vmcb)
return !!(vmcb->control.int_ctl & V_GIF_MASK);
else
return !!(svm->vcpu.arch.hflags & HF_GIF_MASK);
}
static inline bool nested_npt_enabled(struct vcpu_svm *svm)
{
return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE;
}
/* svm.c */
#define MSR_INVALID 0xffffffffU
#define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
extern bool dump_invalid_vmcb;
u32 svm_msrpm_offset(u32 msr);
u32 *svm_vcpu_alloc_msrpm(void);
void svm_vcpu_init_msrpm(struct kvm_vcpu *vcpu, u32 *msrpm);
void svm_vcpu_free_msrpm(u32 *msrpm);
void svm_copy_lbrs(struct vmcb *to_vmcb, struct vmcb *from_vmcb);
void svm_update_lbrv(struct kvm_vcpu *vcpu);
int svm_set_efer(struct kvm_vcpu *vcpu, u64 efer);
void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
@ -574,7 +606,7 @@ extern struct kvm_x86_nested_ops svm_nested_ops;
int avic_ga_log_notifier(u32 ga_tag);
void avic_vm_destroy(struct kvm *kvm);
int avic_vm_init(struct kvm *kvm);
void avic_init_vmcb(struct vcpu_svm *svm);
void avic_init_vmcb(struct vcpu_svm *svm, struct vmcb *vmcb);
int avic_incomplete_ipi_interception(struct kvm_vcpu *vcpu);
int avic_unaccelerated_access_interception(struct kvm_vcpu *vcpu);
int avic_init_vcpu(struct vcpu_svm *svm);
@ -592,6 +624,7 @@ int avic_pi_update_irte(struct kvm *kvm, unsigned int host_irq,
void avic_vcpu_blocking(struct kvm_vcpu *vcpu);
void avic_vcpu_unblocking(struct kvm_vcpu *vcpu);
void avic_ring_doorbell(struct kvm_vcpu *vcpu);
unsigned long avic_vcpu_get_apicv_inhibit_reasons(struct kvm_vcpu *vcpu);
/* sev.c */

20
arch/x86/kvm/trace.h
View File

@ -1459,6 +1459,26 @@ TRACE_EVENT(kvm_avic_ga_log,
__entry->vmid, __entry->vcpuid)
);
TRACE_EVENT(kvm_avic_kick_vcpu_slowpath,
TP_PROTO(u32 icrh, u32 icrl, u32 index),
TP_ARGS(icrh, icrl, index),
TP_STRUCT__entry(
__field(u32, icrh)
__field(u32, icrl)
__field(u32, index)
),
TP_fast_assign(
__entry->icrh = icrh;
__entry->icrl = icrl;
__entry->index = index;
),
TP_printk("icrh:icrl=%#08x:%08x, index=%u",
__entry->icrh, __entry->icrl, __entry->index)
);
TRACE_EVENT(kvm_hv_timer_state,
TP_PROTO(unsigned int vcpu_id, unsigned int hv_timer_in_use),
TP_ARGS(vcpu_id, hv_timer_in_use),

63
arch/x86/kvm/vmx/nested.c
View File

@ -476,24 +476,23 @@ static int nested_vmx_check_exception(struct kvm_vcpu *vcpu, unsigned long *exit
return 0;
}
static void vmx_inject_page_fault_nested(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
static bool nested_vmx_handle_page_fault_workaround(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
{
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
WARN_ON(!is_guest_mode(vcpu));
if (nested_vmx_is_page_fault_vmexit(vmcs12, fault->error_code) &&
!to_vmx(vcpu)->nested.nested_run_pending) {
!WARN_ON_ONCE(to_vmx(vcpu)->nested.nested_run_pending)) {
vmcs12->vm_exit_intr_error_code = fault->error_code;
nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
PF_VECTOR | INTR_TYPE_HARD_EXCEPTION |
INTR_INFO_DELIVER_CODE_MASK | INTR_INFO_VALID_MASK,
fault->address);
} else {
kvm_inject_page_fault(vcpu, fault);
return true;
}
return false;
}
static int nested_vmx_check_io_bitmap_controls(struct kvm_vcpu *vcpu,
@ -2614,9 +2613,6 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3);
}
if (!enable_ept)
vcpu->arch.walk_mmu->inject_page_fault = vmx_inject_page_fault_nested;
if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) &&
WARN_ON_ONCE(kvm_set_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
vmcs12->guest_ia32_perf_global_ctrl))) {
@ -3695,12 +3691,34 @@ vmcs12_guest_cr4(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
}
static void vmcs12_save_pending_event(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12)
struct vmcs12 *vmcs12,
u32 vm_exit_reason, u32 exit_intr_info)
{
u32 idt_vectoring;
unsigned int nr;
if (vcpu->arch.exception.injected) {
/*
* Per the SDM, VM-Exits due to double and triple faults are never
* considered to occur during event delivery, even if the double/triple
* fault is the result of an escalating vectoring issue.
*
* Note, the SDM qualifies the double fault behavior with "The original
* event results in a double-fault exception". It's unclear why the
* qualification exists since exits due to double fault can occur only
* while vectoring a different exception (injected events are never
* subject to interception), i.e. there's _always_ an original event.
*
* The SDM also uses NMI as a confusing example for the "original event
* causes the VM exit directly" clause. NMI isn't special in any way,
* the same rule applies to all events that cause an exit directly.
* NMI is an odd choice for the example because NMIs can only occur on
* instruction boundaries, i.e. they _can't_ occur during vectoring.
*/
if ((u16)vm_exit_reason == EXIT_REASON_TRIPLE_FAULT ||
((u16)vm_exit_reason == EXIT_REASON_EXCEPTION_NMI &&
is_double_fault(exit_intr_info))) {
vmcs12->idt_vectoring_info_field = 0;
} else if (vcpu->arch.exception.injected) {
nr = vcpu->arch.exception.nr;
idt_vectoring = nr | VECTORING_INFO_VALID_MASK;
@ -3733,6 +3751,8 @@ static void vmcs12_save_pending_event(struct kvm_vcpu *vcpu,
idt_vectoring |= INTR_TYPE_EXT_INTR;
vmcs12->idt_vectoring_info_field = idt_vectoring;
} else {
vmcs12->idt_vectoring_info_field = 0;
}
}
@ -4202,12 +4222,12 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
if (to_vmx(vcpu)->exit_reason.enclave_mode)
vmcs12->vm_exit_reason |= VMX_EXIT_REASONS_SGX_ENCLAVE_MODE;
vmcs12->exit_qualification = exit_qualification;
vmcs12->vm_exit_intr_info = exit_intr_info;
vmcs12->idt_vectoring_info_field = 0;
vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
/*
* On VM-Exit due to a failed VM-Entry, the VMCS isn't marked launched
* and only EXIT_REASON and EXIT_QUALIFICATION are updated, all other
* exit info fields are unmodified.
*/
if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) {
vmcs12->launch_state = 1;
@ -4219,7 +4239,12 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
* Transfer the event that L0 or L1 may wanted to inject into
* L2 to IDT_VECTORING_INFO_FIELD.
*/
vmcs12_save_pending_event(vcpu, vmcs12);
vmcs12_save_pending_event(vcpu, vmcs12,
vm_exit_reason, exit_intr_info);
vmcs12->vm_exit_intr_info = exit_intr_info;
vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
/*
* According to spec, there's no need to store the guest's
@ -4518,9 +4543,6 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason,
/* trying to cancel vmlaunch/vmresume is a bug */
WARN_ON_ONCE(vmx->nested.nested_run_pending);
/* Similarly, triple faults in L2 should never escape. */
WARN_ON_ONCE(kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu));
if (kvm_check_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu)) {
/*
* KVM_REQ_GET_NESTED_STATE_PAGES is also used to map
@ -6809,6 +6831,7 @@ __init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *))
struct kvm_x86_nested_ops vmx_nested_ops = {
.leave_nested = vmx_leave_nested,
.check_events = vmx_check_nested_events,
.handle_page_fault_workaround = nested_vmx_handle_page_fault_workaround,
.hv_timer_pending = nested_vmx_preemption_timer_pending,
.triple_fault = nested_vmx_triple_fault,
.get_state = vmx_get_nested_state,

2
arch/x86/kvm/vmx/pmu_intel.c
View File

@ -719,7 +719,7 @@ static void intel_pmu_cleanup(struct kvm_vcpu *vcpu)
intel_pmu_release_guest_lbr_event(vcpu);
}
struct kvm_pmu_ops intel_pmu_ops = {
struct kvm_pmu_ops intel_pmu_ops __initdata = {
.pmc_perf_hw_id = intel_pmc_perf_hw_id,
.pmc_is_enabled = intel_pmc_is_enabled,
.pmc_idx_to_pmc = intel_pmc_idx_to_pmc,

11
arch/x86/kvm/vmx/posted_intr.c
View File

@ -202,16 +202,17 @@ void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu)
void pi_wakeup_handler(void)
{
int cpu = smp_processor_id();
struct list_head *wakeup_list = &per_cpu(wakeup_vcpus_on_cpu, cpu);
raw_spinlock_t *spinlock = &per_cpu(wakeup_vcpus_on_cpu_lock, cpu);
struct vcpu_vmx *vmx;
raw_spin_lock(&per_cpu(wakeup_vcpus_on_cpu_lock, cpu));
list_for_each_entry(vmx, &per_cpu(wakeup_vcpus_on_cpu, cpu),
pi_wakeup_list) {
raw_spin_lock(spinlock);
list_for_each_entry(vmx, wakeup_list, pi_wakeup_list) {
if (pi_test_on(&vmx->pi_desc))
kvm_vcpu_wake_up(&vmx->vcpu);
}
raw_spin_unlock(&per_cpu(wakeup_vcpus_on_cpu_lock, cpu));
raw_spin_unlock(spinlock);
}
void __init pi_init_cpu(int cpu)
@ -311,7 +312,7 @@ int vmx_pi_update_irte(struct kvm *kvm, unsigned int host_irq,
continue;
}
vcpu_info.pi_desc_addr = __pa(&to_vmx(vcpu)->pi_desc);
vcpu_info.pi_desc_addr = __pa(vcpu_to_pi_desc(vcpu));
vcpu_info.vector = irq.vector;
trace_kvm_pi_irte_update(host_irq, vcpu->vcpu_id, e->gsi,

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