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

Browse Source 
* Documentation improvements
 
 * Prevent module exit until all VMs are freed
 
 * PMU Virtualization fixes
 
 * Fix for kvm_irq_delivery_to_apic_fast() NULL-pointer dereferences
 
 * Other miscellaneous bugfixes
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:

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

 - Documentation improvements

 - Prevent module exit until all VMs are freed

 - PMU Virtualization fixes

 - Fix for kvm_irq_delivery_to_apic_fast() NULL-pointer dereferences

 - Other miscellaneous bugfixes

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (42 commits)
  KVM: x86: fix sending PV IPI
  KVM: x86/mmu: do compare-and-exchange of gPTE via the user address
  KVM: x86: Remove redundant vm_entry_controls_clearbit() call
  KVM: x86: cleanup enter_rmode()
  KVM: x86: SVM: fix tsc scaling when the host doesn't support it
  kvm: x86: SVM: remove unused defines
  KVM: x86: SVM: move tsc ratio definitions to svm.h
  KVM: x86: SVM: fix avic spec based definitions again
  KVM: MIPS: remove reference to trap&emulate virtualization
  KVM: x86: document limitations of MSR filtering
  KVM: x86: Only do MSR filtering when access MSR by rdmsr/wrmsr
  KVM: x86/emulator: Emulate RDPID only if it is enabled in guest
  KVM: x86/pmu: Fix and isolate TSX-specific performance event logic
  KVM: x86: mmu: trace kvm_mmu_set_spte after the new SPTE was set
  KVM: x86/svm: Clear reserved bits written to PerfEvtSeln MSRs
  KVM: x86: Trace all APICv inhibit changes and capture overall status
  KVM: x86: Add wrappers for setting/clearing APICv inhibits
  KVM: x86: Make APICv inhibit reasons an enum and cleanup naming
  KVM: X86: Handle implicit supervisor access with SMAP
  KVM: X86: Rename variable smap to not_smap in permission_fault()
  ...
This commit is contained in:
Linus Torvalds 2022-04-02 12:09:02 -07:00
commit 38904911e8
49 changed files with 616 additions and 413 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
Documentation/virt/kvm/api.rst
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@ -151,12 +151,6 @@ In order to create user controlled virtual machines on S390, check
KVM_CAP_S390_UCONTROL and use the flag KVM_VM_S390_UCONTROL as
privileged user (CAP_SYS_ADMIN).
To use hardware assisted virtualization on MIPS (VZ ASE) rather than
the default trap & emulate implementation (which changes the virtual
memory layout to fit in user mode), check KVM_CAP_MIPS_VZ and use the
flag KVM_VM_MIPS_VZ.
On arm64, the physical address size for a VM (IPA Size limit) is limited
to 40bits by default. The limit can be configured if the host supports the
extension KVM_CAP_ARM_VM_IPA_SIZE. When supported, use
@ -4081,6 +4075,11 @@ x2APIC MSRs are always allowed, independent of the ``default_allow`` setting,
and their behavior depends on the ``X2APIC_ENABLE`` bit of the APIC base
register.
.. warning::
MSR accesses coming from nested vmentry/vmexit are not filtered.
This includes both writes to individual VMCS fields and reads/writes
through the MSR lists pointed to by the VMCS.
If a bit is within one of the defined ranges, read and write accesses are
guarded by the bitmap's value for the MSR index if the kind of access
is included in the ``struct kvm_msr_filter_range`` flags. If no range
@ -5293,6 +5292,10 @@ type values:
KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO
Sets the guest physical address of the vcpu_info for a given vCPU.
As with the shared_info page for the VM, the corresponding page may be
dirtied at any time if event channel interrupt delivery is enabled, so
userspace should always assume that the page is dirty without relying
on dirty logging.
KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO
Sets the guest physical address of an additional pvclock structure
@ -7719,3 +7722,49 @@ only be invoked on a VM prior to the creation of VCPUs.
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.
9. Known KVM API problems
=========================
In some cases, KVM's API has some inconsistencies or common pitfalls
that userspace need to be aware of. This section details some of
these issues.
Most of them are architecture specific, so the section is split by
architecture.
9.1. x86
--------
``KVM_GET_SUPPORTED_CPUID`` issues
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
In general, ``KVM_GET_SUPPORTED_CPUID`` is designed so that it is possible
to take its result and pass it directly to ``KVM_SET_CPUID2``. This section
documents some cases in which that requires some care.
Local APIC features
~~~~~~~~~~~~~~~~~~~
CPU[EAX=1]:ECX[21] (X2APIC) is reported by ``KVM_GET_SUPPORTED_CPUID``,
but it can only be enabled if ``KVM_CREATE_IRQCHIP`` or
``KVM_ENABLE_CAP(KVM_CAP_IRQCHIP_SPLIT)`` are used to enable in-kernel emulation of
the local APIC.
The same is true for the ``KVM_FEATURE_PV_UNHALT`` paravirtualized feature.
CPU[EAX=1]:ECX[24] (TSC_DEADLINE) is not reported by ``KVM_GET_SUPPORTED_CPUID``.
It can be enabled if ``KVM_CAP_TSC_DEADLINE_TIMER`` is present and the kernel
has enabled in-kernel emulation of the local APIC.
Obsolete ioctls and capabilities
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KVM_CAP_DISABLE_QUIRKS does not let userspace know which quirks are actually
available. Use ``KVM_CHECK_EXTENSION(KVM_CAP_DISABLE_QUIRKS2)`` instead if
available.
Ordering of KVM_GET_*/KVM_SET_* ioctls
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TBD

28
Documentation/virt/kvm/index.rst
View File

@ -8,25 +8,13 @@ KVM
:maxdepth: 2
api
amd-memory-encryption
cpuid
halt-polling
hypercalls
locking
mmu
msr
nested-vmx
ppc-pv
s390-diag
s390-pv
s390-pv-boot
timekeeping
vcpu-requests
review-checklist
arm/index
devices/index
running-nested-guests
arm/index
s390/index
ppc-pv
x86/index
locking
vcpu-requests
review-checklist

43
Documentation/virt/kvm/locking.rst
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@ -210,32 +210,47 @@ time it will be set using the Dirty tracking mechanism described above.
3. Reference
------------
:Name: kvm_lock
``kvm_lock``
^^^^^^^^^^^^
:Type: mutex
:Arch: any
:Protects: - vm_list
:Name: kvm_count_lock
``kvm_count_lock``
^^^^^^^^^^^^^^^^^^
:Type: raw_spinlock_t
:Arch: any
:Protects: - hardware virtualization enable/disable
:Comment: 'raw' because hardware enabling/disabling must be atomic /wrt
migration.
:Name: kvm_arch::tsc_write_lock
:Type: raw_spinlock
``kvm->mn_invalidate_lock``
^^^^^^^^^^^^^^^^^^^^^^^^^^^
:Type: spinlock_t
:Arch: any
:Protects: mn_active_invalidate_count, mn_memslots_update_rcuwait
``kvm_arch::tsc_write_lock``
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
:Type: raw_spinlock_t
:Arch: x86
:Protects: - kvm_arch::{last_tsc_write,last_tsc_nsec,last_tsc_offset}
- tsc offset in vmcb
:Comment: 'raw' because updating the tsc offsets must not be preempted.
:Name: kvm->mmu_lock
:Type: spinlock_t
``kvm->mmu_lock``
^^^^^^^^^^^^^^^^^
:Type: spinlock_t or rwlock_t
:Arch: any
:Protects: -shadow page/shadow tlb entry
:Comment: it is a spinlock since it is used in mmu notifier.
:Name: kvm->srcu
``kvm->srcu``
^^^^^^^^^^^^^
:Type: srcu lock
:Arch: any
:Protects: - kvm->memslots
@ -246,10 +261,20 @@ time it will be set using the Dirty tracking mechanism described above.
The srcu index can be stored in kvm_vcpu->srcu_idx per vcpu
if it is needed by multiple functions.
:Name: blocked_vcpu_on_cpu_lock
``kvm->slots_arch_lock``
^^^^^^^^^^^^^^^^^^^^^^^^
:Type: mutex
:Arch: any (only needed on x86 though)
:Protects: any arch-specific fields of memslots that have to be modified
in a ``kvm->srcu`` read-side critical section.
:Comment: must be held before reading the pointer to the current memslots,
until after all changes to the memslots are complete
``wakeup_vcpus_on_cpu_lock``
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
:Type: spinlock_t
:Arch: x86
:Protects: blocked_vcpu_on_cpu
:Protects: wakeup_vcpus_on_cpu
:Comment: This is a per-CPU lock and it is used for VT-d posted-interrupts.
When VT-d posted-interrupts is supported and the VM has assigned
devices, we put the blocked vCPU on the list blocked_vcpu_on_cpu

12
Documentation/virt/kvm/s390/index.rst Normal file
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@ -0,0 +1,12 @@
.. SPDX-License-Identifier: GPL-2.0
====================
KVM for s390 systems
====================
.. toctree::
:maxdepth: 2
s390-diag
s390-pv
s390-pv-boot

0
Documentation/virt/kvm/s390-diag.rst → Documentation/virt/kvm/s390/s390-diag.rst
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0
Documentation/virt/kvm/s390-pv-boot.rst → Documentation/virt/kvm/s390/s390-pv-boot.rst
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0
Documentation/virt/kvm/s390-pv.rst → Documentation/virt/kvm/s390/s390-pv.rst
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10
Documentation/virt/kvm/vcpu-requests.rst
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@ -135,6 +135,16 @@ KVM_REQ_UNHALT
such as a pending signal, which does not indicate the VCPU's halt
emulation should stop, and therefore does not make the request.
KVM_REQ_OUTSIDE_GUEST_MODE
This "request" ensures the target vCPU has exited guest mode prior to the
sender of the request continuing on. No action needs be taken by the target,
and so no request is actually logged for the target. This request is similar
to a "kick", but unlike a kick it guarantees the vCPU has actually exited
guest mode. A kick only guarantees the vCPU will exit at some point in the
future, e.g. a previous kick may have started the process, but there's no
guarantee the to-be-kicked vCPU has fully exited guest mode.
KVM_REQUEST_MASK
----------------

0
Documentation/virt/kvm/amd-memory-encryption.rst → Documentation/virt/kvm/x86/amd-memory-encryption.rst
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0
Documentation/virt/kvm/cpuid.rst → Documentation/virt/kvm/x86/cpuid.rst
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39
Documentation/virt/kvm/x86/errata.rst Normal file
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@ -0,0 +1,39 @@
=======================================
Known limitations of CPU virtualization
=======================================
Whenever perfect emulation of a CPU feature is impossible or too hard, KVM
has to choose between not implementing the feature at all or introducing
behavioral differences between virtual machines and bare metal systems.
This file documents some of the known limitations that KVM has in
virtualizing CPU features.
x86
===
``KVM_GET_SUPPORTED_CPUID`` issues
----------------------------------
x87 features
~~~~~~~~~~~~
Unlike most other CPUID feature bits, CPUID[EAX=7,ECX=0]:EBX[6]
(FDP_EXCPTN_ONLY) and CPUID[EAX=7,ECX=0]:EBX]13] (ZERO_FCS_FDS) are
clear if the features are present and set if the features are not present.
Clearing these bits in CPUID has no effect on the operation of the guest;
if these bits are set on hardware, the features will not be present on
any virtual machine that runs on that hardware.
**Workaround:** It is recommended to always set these bits in guest CPUID.
Note however that any software (e.g ``WIN87EM.DLL``) expecting these features
to be present likely predates these CPUID feature bits, and therefore
doesn't know to check for them anyway.
Nested virtualization features
------------------------------
TBD

0
Documentation/virt/kvm/halt-polling.rst → Documentation/virt/kvm/x86/halt-polling.rst
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0
Documentation/virt/kvm/hypercalls.rst → Documentation/virt/kvm/x86/hypercalls.rst
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19
Documentation/virt/kvm/x86/index.rst Normal file
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@ -0,0 +1,19 @@
.. SPDX-License-Identifier: GPL-2.0
===================
KVM for x86 systems
===================
.. toctree::
:maxdepth: 2
amd-memory-encryption
cpuid
errata
halt-polling
hypercalls
mmu
msr
nested-vmx
running-nested-guests
timekeeping

0
Documentation/virt/kvm/mmu.rst → Documentation/virt/kvm/x86/mmu.rst
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0
Documentation/virt/kvm/msr.rst → Documentation/virt/kvm/x86/msr.rst
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0
Documentation/virt/kvm/nested-vmx.rst → Documentation/virt/kvm/x86/nested-vmx.rst
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0
Documentation/virt/kvm/running-nested-guests.rst → Documentation/virt/kvm/x86/running-nested-guests.rst
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0
Documentation/virt/kvm/timekeeping.rst → Documentation/virt/kvm/x86/timekeeping.rst
View File

2
arch/s390/kvm/kvm-s390.c
View File

@ -3462,7 +3462,7 @@ void exit_sie(struct kvm_vcpu *vcpu)
/* Kick a guest cpu out of SIE to process a request synchronously */
void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
{
kvm_make_request(req, vcpu);
__kvm_make_request(req, vcpu);
kvm_s390_vcpu_request(vcpu);
}

46
arch/x86/include/asm/kvm_host.h
View File

@ -249,6 +249,7 @@ enum x86_intercept_stage;
#define PFERR_SGX_BIT 15
#define PFERR_GUEST_FINAL_BIT 32
#define PFERR_GUEST_PAGE_BIT 33
#define PFERR_IMPLICIT_ACCESS_BIT 48
#define PFERR_PRESENT_MASK (1U << PFERR_PRESENT_BIT)
#define PFERR_WRITE_MASK (1U << PFERR_WRITE_BIT)
@ -259,6 +260,7 @@ enum x86_intercept_stage;
#define PFERR_SGX_MASK (1U << PFERR_SGX_BIT)
#define PFERR_GUEST_FINAL_MASK (1ULL << PFERR_GUEST_FINAL_BIT)
#define PFERR_GUEST_PAGE_MASK (1ULL << PFERR_GUEST_PAGE_BIT)
#define PFERR_IMPLICIT_ACCESS (1ULL << PFERR_IMPLICIT_ACCESS_BIT)
#define PFERR_NESTED_GUEST_PAGE (PFERR_GUEST_PAGE_MASK | \
PFERR_WRITE_MASK | \
@ -430,7 +432,7 @@ struct kvm_mmu {
void (*inject_page_fault)(struct kvm_vcpu *vcpu,
struct x86_exception *fault);
gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
gpa_t gva_or_gpa, u32 access,
gpa_t gva_or_gpa, u64 access,
struct x86_exception *exception);
int (*sync_page)(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp);
@ -512,6 +514,7 @@ struct kvm_pmu {
u64 global_ctrl_mask;
u64 global_ovf_ctrl_mask;
u64 reserved_bits;
u64 raw_event_mask;
u8 version;
struct kvm_pmc gp_counters[INTEL_PMC_MAX_GENERIC];
struct kvm_pmc fixed_counters[KVM_PMC_MAX_FIXED];
@ -1040,14 +1043,16 @@ struct kvm_x86_msr_filter {
struct msr_bitmap_range ranges[16];
};
#define APICV_INHIBIT_REASON_DISABLE 0
#define APICV_INHIBIT_REASON_HYPERV 1
#define APICV_INHIBIT_REASON_NESTED 2
#define APICV_INHIBIT_REASON_IRQWIN 3
#define APICV_INHIBIT_REASON_PIT_REINJ 4
#define APICV_INHIBIT_REASON_X2APIC 5
#define APICV_INHIBIT_REASON_BLOCKIRQ 6
#define APICV_INHIBIT_REASON_ABSENT 7
enum kvm_apicv_inhibit {
APICV_INHIBIT_REASON_DISABLE,
APICV_INHIBIT_REASON_HYPERV,
APICV_INHIBIT_REASON_NESTED,
APICV_INHIBIT_REASON_IRQWIN,
APICV_INHIBIT_REASON_PIT_REINJ,
APICV_INHIBIT_REASON_X2APIC,
APICV_INHIBIT_REASON_BLOCKIRQ,
APICV_INHIBIT_REASON_ABSENT,
};
struct kvm_arch {
unsigned long n_used_mmu_pages;
@ -1401,7 +1406,7 @@ struct kvm_x86_ops {
void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
void (*enable_irq_window)(struct kvm_vcpu *vcpu);
void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
bool (*check_apicv_inhibit_reasons)(ulong bit);
bool (*check_apicv_inhibit_reasons)(enum kvm_apicv_inhibit reason);
void (*refresh_apicv_exec_ctrl)(struct kvm_vcpu *vcpu);
void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
void (*hwapic_isr_update)(struct kvm_vcpu *vcpu, int isr);
@ -1585,7 +1590,7 @@ void kvm_mmu_module_exit(void);
void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
int kvm_mmu_create(struct kvm_vcpu *vcpu);
void kvm_mmu_init_vm(struct kvm *kvm);
int kvm_mmu_init_vm(struct kvm *kvm);
void kvm_mmu_uninit_vm(struct kvm *kvm);
void kvm_mmu_after_set_cpuid(struct kvm_vcpu *vcpu);
@ -1795,11 +1800,22 @@ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
bool kvm_apicv_activated(struct kvm *kvm);
void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu);
void kvm_request_apicv_update(struct kvm *kvm, bool activate,
unsigned long bit);
void __kvm_set_or_clear_apicv_inhibit(struct kvm *kvm,
enum kvm_apicv_inhibit reason, bool set);
void kvm_set_or_clear_apicv_inhibit(struct kvm *kvm,
enum kvm_apicv_inhibit reason, bool set);
void __kvm_request_apicv_update(struct kvm *kvm, bool activate,
unsigned long bit);
static inline void kvm_set_apicv_inhibit(struct kvm *kvm,
enum kvm_apicv_inhibit reason)
{
kvm_set_or_clear_apicv_inhibit(kvm, reason, true);
}
static inline void kvm_clear_apicv_inhibit(struct kvm *kvm,
enum kvm_apicv_inhibit reason)
{
kvm_set_or_clear_apicv_inhibit(kvm, reason, false);
}
int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);

14
arch/x86/include/asm/svm.h
View File

@ -221,8 +221,14 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
#define SVM_NESTED_CTL_SEV_ES_ENABLE BIT(2)
#define SVM_TSC_RATIO_RSVD 0xffffff0000000000ULL
#define SVM_TSC_RATIO_MIN 0x0000000000000001ULL
#define SVM_TSC_RATIO_MAX 0x000000ffffffffffULL
#define SVM_TSC_RATIO_DEFAULT 0x0100000000ULL
/* AVIC */
#define AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK (0xFF)
#define AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK (0xFFULL)
#define AVIC_LOGICAL_ID_ENTRY_VALID_BIT 31
#define AVIC_LOGICAL_ID_ENTRY_VALID_MASK (1 << 31)
@ -230,9 +236,11 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
#define AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK (0xFFFFFFFFFFULL << 12)
#define AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK (1ULL << 62)
#define AVIC_PHYSICAL_ID_ENTRY_VALID_MASK (1ULL << 63)
#define AVIC_PHYSICAL_ID_TABLE_SIZE_MASK (0xFF)
#define AVIC_PHYSICAL_ID_TABLE_SIZE_MASK (0xFFULL)
#define AVIC_DOORBELL_PHYSICAL_ID_MASK (0xFF)
#define AVIC_DOORBELL_PHYSICAL_ID_MASK GENMASK_ULL(11, 0)
#define VMCB_AVIC_APIC_BAR_MASK 0xFFFFFFFFFF000ULL
#define AVIC_UNACCEL_ACCESS_WRITE_MASK 1
#define AVIC_UNACCEL_ACCESS_OFFSET_MASK 0xFF0

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

@ -517,7 +517,7 @@ static void __send_ipi_mask(const struct cpumask *mask, int vector)
} else if (apic_id < min && max - apic_id < KVM_IPI_CLUSTER_SIZE) {
ipi_bitmap <<= min - apic_id;
min = apic_id;
} else if (apic_id < min + KVM_IPI_CLUSTER_SIZE) {
} else if (apic_id > min && apic_id < min + KVM_IPI_CLUSTER_SIZE) {
max = apic_id < max ? max : apic_id;
} else {
ret = kvm_hypercall4(KVM_HC_SEND_IPI, (unsigned long)ipi_bitmap,

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

@ -735,6 +735,7 @@ static struct kvm_cpuid_entry2 *do_host_cpuid(struct kvm_cpuid_array *array,
if (function > READ_ONCE(max_cpuid_80000000))
return entry;
}
break;
default:
break;

8
arch/x86/kvm/emulate.c
View File

@ -3540,8 +3540,10 @@ static int em_rdpid(struct x86_emulate_ctxt *ctxt)
{
u64 tsc_aux = 0;
if (ctxt->ops->get_msr(ctxt, MSR_TSC_AUX, &tsc_aux))
if (!ctxt->ops->guest_has_rdpid(ctxt))
return emulate_ud(ctxt);
ctxt->ops->get_msr(ctxt, MSR_TSC_AUX, &tsc_aux);
ctxt->dst.val = tsc_aux;
return X86EMUL_CONTINUE;
}
@ -3642,7 +3644,7 @@ static int em_wrmsr(struct x86_emulate_ctxt *ctxt)
msr_data = (u32)reg_read(ctxt, VCPU_REGS_RAX)
| ((u64)reg_read(ctxt, VCPU_REGS_RDX) << 32);
r = ctxt->ops->set_msr(ctxt, msr_index, msr_data);
r = ctxt->ops->set_msr_with_filter(ctxt, msr_index, msr_data);
if (r == X86EMUL_IO_NEEDED)
return r;
@ -3659,7 +3661,7 @@ static int em_rdmsr(struct x86_emulate_ctxt *ctxt)
u64 msr_data;
int r;
r = ctxt->ops->get_msr(ctxt, msr_index, &msr_data);
r = ctxt->ops->get_msr_with_filter(ctxt, msr_index, &msr_data);
if (r == X86EMUL_IO_NEEDED)
return r;

22
arch/x86/kvm/hyperv.c
View File

@ -122,9 +122,13 @@ static void synic_update_vector(struct kvm_vcpu_hv_synic *synic,
else
hv->synic_auto_eoi_used--;
__kvm_request_apicv_update(vcpu->kvm,
!hv->synic_auto_eoi_used,
APICV_INHIBIT_REASON_HYPERV);
/*
* Inhibit APICv if any vCPU is using SynIC's AutoEOI, which relies on
* the hypervisor to manually inject IRQs.
*/
__kvm_set_or_clear_apicv_inhibit(vcpu->kvm,
APICV_INHIBIT_REASON_HYPERV,
!!hv->synic_auto_eoi_used);
up_write(&vcpu->kvm->arch.apicv_update_lock);
}
@ -239,7 +243,7 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic);
int ret;
if (!synic->active && !host)
if (!synic->active && (!host || data))
return 1;
trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
@ -285,6 +289,9 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
case HV_X64_MSR_EOM: {
int i;
if (!synic->active)
break;
for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
kvm_hv_notify_acked_sint(vcpu, i);
break;
@ -449,6 +456,9 @@ static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
struct kvm_lapic_irq irq;
int ret, vector;
if (KVM_BUG_ON(!lapic_in_kernel(vcpu), vcpu->kvm))
return -EINVAL;
if (sint >= ARRAY_SIZE(synic->sint))
return -EINVAL;
@ -661,7 +671,7 @@ static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
if (!synic->active && !host)
if (!synic->active && (!host || config))
return 1;
if (unlikely(!host && hv_vcpu->enforce_cpuid && new_config.direct_mode &&
@ -690,7 +700,7 @@ static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
if (!synic->active && !host)
if (!synic->active && (!host || count))
return 1;
trace_kvm_hv_stimer_set_count(hv_stimer_to_vcpu(stimer)->vcpu_id,

6
arch/x86/kvm/i8254.c
View File

@ -305,15 +305,13 @@ void kvm_pit_set_reinject(struct kvm_pit *pit, bool reinject)
* So, deactivate APICv when PIT is in reinject mode.
*/
if (reinject) {
kvm_request_apicv_update(kvm, false,
APICV_INHIBIT_REASON_PIT_REINJ);
kvm_set_apicv_inhibit(kvm, APICV_INHIBIT_REASON_PIT_REINJ);
/* The initial state is preserved while ps->reinject == 0. */
kvm_pit_reset_reinject(pit);
kvm_register_irq_ack_notifier(kvm, &ps->irq_ack_notifier);
kvm_register_irq_mask_notifier(kvm, 0, &pit->mask_notifier);
} else {
kvm_request_apicv_update(kvm, true,
APICV_INHIBIT_REASON_PIT_REINJ);
kvm_clear_apicv_inhibit(kvm, APICV_INHIBIT_REASON_PIT_REINJ);
kvm_unregister_irq_ack_notifier(kvm, &ps->irq_ack_notifier);
kvm_unregister_irq_mask_notifier(kvm, 0, &pit->mask_notifier);
}

3
arch/x86/kvm/kvm_emulate.h
View File

@ -210,6 +210,8 @@ struct x86_emulate_ops {
int (*set_dr)(struct x86_emulate_ctxt *ctxt, int dr, ulong value);
u64 (*get_smbase)(struct x86_emulate_ctxt *ctxt);
void (*set_smbase)(struct x86_emulate_ctxt *ctxt, u64 smbase);
int (*set_msr_with_filter)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data);
int (*get_msr_with_filter)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 *pdata);
int (*set_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data);
int (*get_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 *pdata);
int (*check_pmc)(struct x86_emulate_ctxt *ctxt, u32 pmc);
@ -226,6 +228,7 @@ struct x86_emulate_ops {
bool (*guest_has_long_mode)(struct x86_emulate_ctxt *ctxt);
bool (*guest_has_movbe)(struct x86_emulate_ctxt *ctxt);
bool (*guest_has_fxsr)(struct x86_emulate_ctxt *ctxt);
bool (*guest_has_rdpid)(struct x86_emulate_ctxt *ctxt);
void (*set_nmi_mask)(struct x86_emulate_ctxt *ctxt, bool masked);

4
arch/x86/kvm/lapic.c
View File

@ -1024,6 +1024,10 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
*r = -1;
if (irq->shorthand == APIC_DEST_SELF) {
if (KVM_BUG_ON(!src, kvm)) {
*r = 0;
return true;
}
*r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
return true;
}

32
arch/x86/kvm/mmu.h
View File

@ -214,27 +214,27 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
*/
static inline u8 permission_fault(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
unsigned pte_access, unsigned pte_pkey,
unsigned pfec)
u64 access)
{
int cpl = static_call(kvm_x86_get_cpl)(vcpu);
/* strip nested paging fault error codes */
unsigned int pfec = access;
unsigned long rflags = static_call(kvm_x86_get_rflags)(vcpu);
/*
* If CPL < 3, SMAP prevention are disabled if EFLAGS.AC = 1.
* For explicit supervisor accesses, SMAP is disabled if EFLAGS.AC = 1.
* For implicit supervisor accesses, SMAP cannot be overridden.
*
* If CPL = 3, SMAP applies to all supervisor-mode data accesses
* (these are implicit supervisor accesses) regardless of the value
* of EFLAGS.AC.
* SMAP works on supervisor accesses only, and not_smap can
* be set or not set when user access with neither has any bearing
* on the result.
*
* This computes (cpl < 3) && (rflags & X86_EFLAGS_AC), leaving
* the result in X86_EFLAGS_AC. We then insert it in place of
* the PFERR_RSVD_MASK bit; this bit will always be zero in pfec,
* but it will be one in index if SMAP checks are being overridden.
* It is important to keep this branchless.
* We put the SMAP checking bit in place of the PFERR_RSVD_MASK bit;
* this bit will always be zero in pfec, but it will be one in index
* if SMAP checks are being disabled.
*/
unsigned long smap = (cpl - 3) & (rflags & X86_EFLAGS_AC);
int index = (pfec >> 1) +
(smap >> (X86_EFLAGS_AC_BIT - PFERR_RSVD_BIT + 1));
u64 implicit_access = access & PFERR_IMPLICIT_ACCESS;
bool not_smap = ((rflags & X86_EFLAGS_AC) | implicit_access) == X86_EFLAGS_AC;
int index = (pfec + (not_smap << PFERR_RSVD_BIT)) >> 1;
bool fault = (mmu->permissions[index] >> pte_access) & 1;
u32 errcode = PFERR_PRESENT_MASK;
@ -317,12 +317,12 @@ static inline void kvm_update_page_stats(struct kvm *kvm, int level, int count)
atomic64_add(count, &kvm->stat.pages[level - 1]);
}
gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access,
gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u64 access,
struct x86_exception *exception);
static inline gpa_t kvm_translate_gpa(struct kvm_vcpu *vcpu,
struct kvm_mmu *mmu,
gpa_t gpa, u32 access,
gpa_t gpa, u64 access,
struct x86_exception *exception)
{
if (mmu != &vcpu->arch.nested_mmu)

27
arch/x86/kvm/mmu/mmu.c
View File

@ -2696,8 +2696,8 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot,
if (*sptep == spte) {
ret = RET_PF_SPURIOUS;
} else {
trace_kvm_mmu_set_spte(level, gfn, sptep);
flush |= mmu_spte_update(sptep, spte);
trace_kvm_mmu_set_spte(level, gfn, sptep);
}
if (wrprot) {
@ -3703,7 +3703,7 @@ void kvm_mmu_sync_prev_roots(struct kvm_vcpu *vcpu)
}
static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
gpa_t vaddr, u32 access,
gpa_t vaddr, u64 access,
struct x86_exception *exception)
{
if (exception)
@ -4591,11 +4591,11 @@ static void update_permission_bitmask(struct kvm_mmu *mmu, bool ept)
* - X86_CR4_SMAP is set in CR4
* - A user page is accessed
* - The access is not a fetch
* - Page fault in kernel mode
* - if CPL = 3 or X86_EFLAGS_AC is clear
* - The access is supervisor mode
* - If implicit supervisor access or X86_EFLAGS_AC is clear
*
* Here, we cover the first three conditions.
* The fourth is computed dynamically in permission_fault();
* Here, we cover the first four conditions.
* The fifth is computed dynamically in permission_fault();
* PFERR_RSVD_MASK bit will be set in PFEC if the access is
* *not* subject to SMAP restrictions.
*/
@ -5768,17 +5768,24 @@ static void kvm_mmu_invalidate_zap_pages_in_memslot(struct kvm *kvm,
kvm_mmu_zap_all_fast(kvm);
}
void kvm_mmu_init_vm(struct kvm *kvm)
int kvm_mmu_init_vm(struct kvm *kvm)
{
struct kvm_page_track_notifier_node *node = &kvm->arch.mmu_sp_tracker;
int r;
INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages);
INIT_LIST_HEAD(&kvm->arch.lpage_disallowed_mmu_pages);
spin_lock_init(&kvm->arch.mmu_unsync_pages_lock);
kvm_mmu_init_tdp_mmu(kvm);
r = kvm_mmu_init_tdp_mmu(kvm);
if (r < 0)
return r;
node->track_write = kvm_mmu_pte_write;
node->track_flush_slot = kvm_mmu_invalidate_zap_pages_in_memslot;
kvm_page_track_register_notifier(kvm, node);
return 0;
}
void kvm_mmu_uninit_vm(struct kvm *kvm)
@ -5842,8 +5849,8 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
if (is_tdp_mmu_enabled(kvm)) {
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
flush = kvm_tdp_mmu_zap_gfn_range(kvm, i, gfn_start,
gfn_end, flush);
flush = kvm_tdp_mmu_zap_leafs(kvm, i, gfn_start,
gfn_end, true, flush);
}
if (flush)

78
arch/x86/kvm/mmu/paging_tmpl.h
View File

@ -34,9 +34,8 @@
#define PT_HAVE_ACCESSED_DIRTY(mmu) true
#ifdef CONFIG_X86_64
#define PT_MAX_FULL_LEVELS PT64_ROOT_MAX_LEVEL
#define CMPXCHG cmpxchg
#define CMPXCHG "cmpxchgq"
#else
#define CMPXCHG cmpxchg64
#define PT_MAX_FULL_LEVELS 2
#endif
#elif PTTYPE == 32
@ -52,7 +51,7 @@
#define PT_GUEST_DIRTY_SHIFT PT_DIRTY_SHIFT
#define PT_GUEST_ACCESSED_SHIFT PT_ACCESSED_SHIFT
#define PT_HAVE_ACCESSED_DIRTY(mmu) true
#define CMPXCHG cmpxchg
#define CMPXCHG "cmpxchgl"
#elif PTTYPE == PTTYPE_EPT
#define pt_element_t u64
#define guest_walker guest_walkerEPT
@ -65,7 +64,9 @@
#define PT_GUEST_DIRTY_SHIFT 9
#define PT_GUEST_ACCESSED_SHIFT 8
#define PT_HAVE_ACCESSED_DIRTY(mmu) ((mmu)->ept_ad)
#define CMPXCHG cmpxchg64
#ifdef CONFIG_X86_64
#define CMPXCHG "cmpxchgq"
#endif
#define PT_MAX_FULL_LEVELS PT64_ROOT_MAX_LEVEL
#else
#error Invalid PTTYPE value
@ -147,43 +148,36 @@ 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)
{
int npages;
pt_element_t ret;
pt_element_t *table;
struct page *page;
signed char r;
npages = get_user_pages_fast((unsigned long)ptep_user, 1, FOLL_WRITE, &page);
if (likely(npages == 1)) {
table = kmap_atomic(page);
ret = CMPXCHG(&table[index], orig_pte, new_pte);
kunmap_atomic(table);
if (!user_access_begin(ptep_user, sizeof(pt_element_t)))
return -EFAULT;
kvm_release_page_dirty(page);
} else {
struct vm_area_struct *vma;
unsigned long vaddr = (unsigned long)ptep_user & PAGE_MASK;
unsigned long pfn;
unsigned long paddr;
#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
mmap_read_lock(current->mm);
vma = find_vma_intersection(current->mm, vaddr, vaddr + PAGE_SIZE);
if (!vma || !(vma->vm_flags & VM_PFNMAP)) {
mmap_read_unlock(current->mm);
return -EFAULT;
}
pfn = ((vaddr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
paddr = pfn << PAGE_SHIFT;
table = memremap(paddr, PAGE_SIZE, MEMREMAP_WB);
if (!table) {
mmap_read_unlock(current->mm);
return -EFAULT;
}
ret = CMPXCHG(&table[index], orig_pte, new_pte);
memunmap(table);
mmap_read_unlock(current->mm);
}
return (ret != orig_pte);
user_access_end();
return r;
}
static bool FNAME(prefetch_invalid_gpte)(struct kvm_vcpu *vcpu,
@ -339,7 +333,7 @@ static inline bool FNAME(is_last_gpte)(struct kvm_mmu *mmu,
*/
static int FNAME(walk_addr_generic)(struct guest_walker *walker,
struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
gpa_t addr, u32 access)
gpa_t addr, u64 access)
{
int ret;
pt_element_t pte;
@ -347,7 +341,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
gfn_t table_gfn;
u64 pt_access, pte_access;
unsigned index, accessed_dirty, pte_pkey;
unsigned nested_access;
u64 nested_access;
gpa_t pte_gpa;
bool have_ad;
int offset;
@ -540,7 +534,7 @@ error:
}
static int FNAME(walk_addr)(struct guest_walker *walker,
struct kvm_vcpu *vcpu, gpa_t addr, u32 access)
struct kvm_vcpu *vcpu, gpa_t addr, u64 access)
{
return FNAME(walk_addr_generic)(walker, vcpu, vcpu->arch.mmu, addr,
access);
@ -988,7 +982,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa)
/* Note, @addr is a GPA when gva_to_gpa() translates an L2 GPA to an L1 GPA. */
static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
gpa_t addr, u32 access,
gpa_t addr, u64 access,
struct x86_exception *exception)
{
struct guest_walker walker;

72
arch/x86/kvm/mmu/tdp_mmu.c
View File

@ -14,21 +14,24 @@ static bool __read_mostly tdp_mmu_enabled = true;
module_param_named(tdp_mmu, tdp_mmu_enabled, bool, 0644);
/* Initializes the TDP MMU for the VM, if enabled. */
bool kvm_mmu_init_tdp_mmu(struct kvm *kvm)
int kvm_mmu_init_tdp_mmu(struct kvm *kvm)
{
struct workqueue_struct *wq;
if (!tdp_enabled || !READ_ONCE(tdp_mmu_enabled))
return false;
return 0;
wq = alloc_workqueue("kvm", WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 0);
if (!wq)
return -ENOMEM;
/* This should not be changed for the lifetime of the VM. */
kvm->arch.tdp_mmu_enabled = true;
INIT_LIST_HEAD(&kvm->arch.tdp_mmu_roots);
spin_lock_init(&kvm->arch.tdp_mmu_pages_lock);
INIT_LIST_HEAD(&kvm->arch.tdp_mmu_pages);
kvm->arch.tdp_mmu_zap_wq =
alloc_workqueue("kvm", WQ_UNBOUND|WQ_MEM_RECLAIM|WQ_CPU_INTENSIVE, 0);
return true;
kvm->arch.tdp_mmu_zap_wq = wq;
return 1;
}
/* Arbitrarily returns true so that this may be used in if statements. */
@ -906,10 +909,8 @@ bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
}
/*
* Tears down the mappings for the range of gfns, [start, end), and frees the
* non-root pages mapping GFNs strictly within that range. Returns true if
* SPTEs have been cleared and a TLB flush is needed before releasing the
* MMU lock.
* Zap leafs SPTEs for the range of gfns, [start, end). Returns true if SPTEs
* have been cleared and a TLB flush is needed before releasing the MMU lock.
*
* If can_yield is true, will release the MMU lock and reschedule if the
* scheduler needs the CPU or there is contention on the MMU lock. If this
@ -917,42 +918,25 @@ bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
* the caller must ensure it does not supply too large a GFN range, or the
* operation can cause a soft lockup.
*/
static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root,
gfn_t start, gfn_t end, bool can_yield, bool flush)
static bool tdp_mmu_zap_leafs(struct kvm *kvm, struct kvm_mmu_page *root,
gfn_t start, gfn_t end, bool can_yield, bool flush)
{
bool zap_all = (start == 0 && end >= tdp_mmu_max_gfn_host());
struct tdp_iter iter;
/*
* No need to try to step down in the iterator when zapping all SPTEs,
* zapping the top-level non-leaf SPTEs will recurse on their children.
*/
int min_level = zap_all ? root->role.level : PG_LEVEL_4K;
end = min(end, tdp_mmu_max_gfn_host());
lockdep_assert_held_write(&kvm->mmu_lock);
rcu_read_lock();
for_each_tdp_pte_min_level(iter, root, min_level, start, end) {
for_each_tdp_pte_min_level(iter, root, PG_LEVEL_4K, start, end) {
if (can_yield &&
tdp_mmu_iter_cond_resched(kvm, &iter, flush, false)) {
flush = false;
continue;
}
if (!is_shadow_present_pte(iter.old_spte))
continue;
/*
* If this is a non-last-level SPTE that covers a larger range
* than should be zapped, continue, and zap the mappings at a
* lower level, except when zapping all SPTEs.
*/
if (!zap_all &&
(iter.gfn < start ||
iter.gfn + KVM_PAGES_PER_HPAGE(iter.level) > end) &&
if (!is_shadow_present_pte(iter.old_spte) ||
!is_last_spte(iter.old_spte, iter.level))
continue;
@ -960,17 +944,13 @@ static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root,
flush = true;
}
/*
* Need to flush before releasing RCU. TODO: do it only if intermediate
* page tables were zapped; there is no need to flush under RCU protection
* if no 'struct kvm_mmu_page' is freed.
*/
if (flush)
kvm_flush_remote_tlbs_with_address(kvm, start, end - start);
rcu_read_unlock();
return false;
/*
* Because this flow zaps _only_ leaf SPTEs, the caller doesn't need
* to provide RCU protection as no 'struct kvm_mmu_page' will be freed.
*/
return flush;
}
/*
@ -979,13 +959,13 @@ static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root,
* SPTEs have been cleared and a TLB flush is needed before releasing the
* MMU lock.
*/
bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id, gfn_t start,
gfn_t end, bool can_yield, bool flush)
bool kvm_tdp_mmu_zap_leafs(struct kvm *kvm, int as_id, gfn_t start, gfn_t end,
bool can_yield, bool flush)
{
struct kvm_mmu_page *root;
for_each_tdp_mmu_root_yield_safe(kvm, root, as_id)
flush = zap_gfn_range(kvm, root, start, end, can_yield, flush);
flush = tdp_mmu_zap_leafs(kvm, root, start, end, can_yield, flush);
return flush;
}
@ -1233,8 +1213,8 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range,
bool flush)
{
return __kvm_tdp_mmu_zap_gfn_range(kvm, range->slot->as_id, range->start,
range->end, range->may_block, flush);
return kvm_tdp_mmu_zap_leafs(kvm, range->slot->as_id, range->start,
range->end, range->may_block, flush);
}
typedef bool (*tdp_handler_t)(struct kvm *kvm, struct tdp_iter *iter,

12
arch/x86/kvm/mmu/tdp_mmu.h
View File

@ -15,14 +15,8 @@ __must_check static inline bool kvm_tdp_mmu_get_root(struct kvm_mmu_page *root)
void kvm_tdp_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *root,
bool shared);
bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id, gfn_t start,
bool kvm_tdp_mmu_zap_leafs(struct kvm *kvm, int as_id, gfn_t start,
gfn_t end, bool can_yield, bool flush);
static inline bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id,
gfn_t start, gfn_t end, bool flush)
{
return __kvm_tdp_mmu_zap_gfn_range(kvm, as_id, start, end, true, flush);
}
bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp);
void kvm_tdp_mmu_zap_all(struct kvm *kvm);
void kvm_tdp_mmu_invalidate_all_roots(struct kvm *kvm);
@ -72,7 +66,7 @@ u64 *kvm_tdp_mmu_fast_pf_get_last_sptep(struct kvm_vcpu *vcpu, u64 addr,
u64 *spte);
#ifdef CONFIG_X86_64
bool kvm_mmu_init_tdp_mmu(struct kvm *kvm);
int kvm_mmu_init_tdp_mmu(struct kvm *kvm);
void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm);
static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return sp->tdp_mmu_page; }
@ -93,7 +87,7 @@ static inline bool is_tdp_mmu(struct kvm_mmu *mmu)
return sp && is_tdp_mmu_page(sp) && sp->root_count;
}
#else
static inline bool kvm_mmu_init_tdp_mmu(struct kvm *kvm) { return false; }
static inline int kvm_mmu_init_tdp_mmu(struct kvm *kvm) { return 0; }
static inline void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm) {}
static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return false; }
static inline bool is_tdp_mmu(struct kvm_mmu *mmu) { return false; }

18
arch/x86/kvm/pmu.c
View File

@ -96,8 +96,7 @@ static void kvm_perf_overflow(struct perf_event *perf_event,
static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
u64 config, bool exclude_user,
bool exclude_kernel, bool intr,
bool in_tx, bool in_tx_cp)
bool exclude_kernel, bool intr)
{
struct perf_event *event;
struct perf_event_attr attr = {
@ -116,16 +115,14 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
attr.sample_period = get_sample_period(pmc, pmc->counter);
if (in_tx)
attr.config |= HSW_IN_TX;
if (in_tx_cp) {
if ((attr.config & HSW_IN_TX_CHECKPOINTED) &&
guest_cpuid_is_intel(pmc->vcpu)) {
/*
* HSW_IN_TX_CHECKPOINTED is not supported with nonzero
* period. Just clear the sample period so at least
* allocating the counter doesn't fail.
*/
attr.sample_period = 0;
attr.config |= HSW_IN_TX_CHECKPOINTED;
}
event = perf_event_create_kernel_counter(&attr, -1, current,
@ -185,6 +182,7 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
u32 type = PERF_TYPE_RAW;
struct kvm *kvm = pmc->vcpu->kvm;
struct kvm_pmu_event_filter *filter;
struct kvm_pmu *pmu = vcpu_to_pmu(pmc->vcpu);
bool allow_event = true;
if (eventsel & ARCH_PERFMON_EVENTSEL_PIN_CONTROL)
@ -221,7 +219,7 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
}
if (type == PERF_TYPE_RAW)
config = eventsel & AMD64_RAW_EVENT_MASK;
config = eventsel & pmu->raw_event_mask;
if (pmc->current_config == eventsel && pmc_resume_counter(pmc))
return;
@ -232,9 +230,7 @@ void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
pmc_reprogram_counter(pmc, type, config,
!(eventsel & ARCH_PERFMON_EVENTSEL_USR),
!(eventsel & ARCH_PERFMON_EVENTSEL_OS),
eventsel & ARCH_PERFMON_EVENTSEL_INT,
(eventsel & HSW_IN_TX),
(eventsel & HSW_IN_TX_CHECKPOINTED));
eventsel & ARCH_PERFMON_EVENTSEL_INT);
}
EXPORT_SYMBOL_GPL(reprogram_gp_counter);
@ -270,7 +266,7 @@ void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx)
kvm_x86_ops.pmu_ops->pmc_perf_hw_id(pmc),
!(en_field & 0x2), /* exclude user */
!(en_field & 0x1), /* exclude kernel */
pmi, false, false);
pmi);
}
EXPORT_SYMBOL_GPL(reprogram_fixed_counter);

14
arch/x86/kvm/svm/avic.c
View File

@ -726,7 +726,7 @@ int avic_pi_update_irte(struct kvm *kvm, unsigned int host_irq,
{
struct kvm_kernel_irq_routing_entry *e;
struct kvm_irq_routing_table *irq_rt;
int idx, ret = -EINVAL;
int idx, ret = 0;
if (!kvm_arch_has_assigned_device(kvm) ||
!irq_remapping_cap(IRQ_POSTING_CAP))
@ -737,7 +737,13 @@ int avic_pi_update_irte(struct kvm *kvm, unsigned int host_irq,
idx = srcu_read_lock(&kvm->irq_srcu);
irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
WARN_ON(guest_irq >= irq_rt->nr_rt_entries);
if (guest_irq >= irq_rt->nr_rt_entries ||
hlist_empty(&irq_rt->map[guest_irq])) {
pr_warn_once("no route for guest_irq %u/%u (broken user space?)\n",
guest_irq, irq_rt->nr_rt_entries);
goto out;
}
hlist_for_each_entry(e, &irq_rt->map[guest_irq], link) {
struct vcpu_data vcpu_info;
@ -822,7 +828,7 @@ out:
return ret;
}
bool avic_check_apicv_inhibit_reasons(ulong bit)
bool avic_check_apicv_inhibit_reasons(enum kvm_apicv_inhibit reason)
{
ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE) |
BIT(APICV_INHIBIT_REASON_ABSENT) |
@ -833,7 +839,7 @@ bool avic_check_apicv_inhibit_reasons(ulong bit)
BIT(APICV_INHIBIT_REASON_X2APIC) |
BIT(APICV_INHIBIT_REASON_BLOCKIRQ);
return supported & BIT(bit);
return supported & BIT(reason);
}

9
arch/x86/kvm/svm/pmu.c
View File

@ -262,12 +262,10 @@ static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
/* MSR_EVNTSELn */
pmc = get_gp_pmc_amd(pmu, msr, PMU_TYPE_EVNTSEL);
if (pmc) {
if (data == pmc->eventsel)
return 0;
if (!(data & pmu->reserved_bits)) {
data &= ~pmu->reserved_bits;
if (data != pmc->eventsel)
reprogram_gp_counter(pmc, data);
return 0;
}
return 0;
}
return 1;
@ -284,6 +282,7 @@ static void amd_pmu_refresh(struct kvm_vcpu *vcpu)
pmu->counter_bitmask[KVM_PMC_GP] = ((u64)1 << 48) - 1;
pmu->reserved_bits = 0xfffffff000280000ull;
pmu->raw_event_mask = AMD64_RAW_EVENT_MASK;
pmu->version = 1;
/* not applicable to AMD; but clean them to prevent any fall out */
pmu->counter_bitmask[KVM_PMC_FIXED] = 0;

36
arch/x86/kvm/svm/svm.c
View File

@ -62,20 +62,8 @@ MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id);
#define SEG_TYPE_LDT 2
#define SEG_TYPE_BUSY_TSS16 3
#define SVM_FEATURE_LBRV (1 << 1)
#define SVM_FEATURE_SVML (1 << 2)
#define SVM_FEATURE_TSC_RATE (1 << 4)
#define SVM_FEATURE_VMCB_CLEAN (1 << 5)
#define SVM_FEATURE_FLUSH_ASID (1 << 6)
#define SVM_FEATURE_DECODE_ASSIST (1 << 7)
#define SVM_FEATURE_PAUSE_FILTER (1 << 10)
#define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
#define TSC_RATIO_RSVD 0xffffff0000000000ULL
#define TSC_RATIO_MIN 0x0000000000000001ULL
#define TSC_RATIO_MAX 0x000000ffffffffffULL
static bool erratum_383_found __read_mostly;
u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
@ -87,7 +75,6 @@ u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
static uint64_t osvw_len = 4, osvw_status;
static DEFINE_PER_CPU(u64, current_tsc_ratio);
#define TSC_RATIO_DEFAULT 0x0100000000ULL
static const struct svm_direct_access_msrs {
u32 index; /* Index of the MSR */
@ -480,7 +467,7 @@ static void svm_hardware_disable(void)
{
/* Make sure we clean up behind us */
if (tsc_scaling)
wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
wrmsrl(MSR_AMD64_TSC_RATIO, SVM_TSC_RATIO_DEFAULT);
cpu_svm_disable();
@ -526,8 +513,8 @@ static int svm_hardware_enable(void)
* Set the default value, even if we don't use TSC scaling
* to avoid having stale value in the msr
*/
wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
__this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT);
wrmsrl(MSR_AMD64_TSC_RATIO, SVM_TSC_RATIO_DEFAULT);
__this_cpu_write(current_tsc_ratio, SVM_TSC_RATIO_DEFAULT);
}
@ -2723,7 +2710,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
break;
}
if (data & TSC_RATIO_RSVD)
if (data & SVM_TSC_RATIO_RSVD)
return 1;
svm->tsc_ratio_msr = data;
@ -2918,7 +2905,7 @@ static int interrupt_window_interception(struct kvm_vcpu *vcpu)
* In this case AVIC was temporarily disabled for
* requesting the IRQ window and we have to re-enable it.
*/
kvm_request_apicv_update(vcpu->kvm, true, APICV_INHIBIT_REASON_IRQWIN);
kvm_clear_apicv_inhibit(vcpu->kvm, APICV_INHIBIT_REASON_IRQWIN);
++vcpu->stat.irq_window_exits;
return 1;
@ -3516,7 +3503,7 @@ static void svm_enable_irq_window(struct kvm_vcpu *vcpu)
* via AVIC. In such case, we need to temporarily disable AVIC,
* and fallback to injecting IRQ via V_IRQ.
*/
kvm_request_apicv_update(vcpu->kvm, false, APICV_INHIBIT_REASON_IRQWIN);
kvm_set_apicv_inhibit(vcpu->kvm, APICV_INHIBIT_REASON_IRQWIN);
svm_set_vintr(svm);
}
}
@ -3948,6 +3935,7 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct kvm_cpuid_entry2 *best;
struct kvm *kvm = vcpu->kvm;
vcpu->arch.xsaves_enabled = guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) &&
boot_cpu_has(X86_FEATURE_XSAVE) &&
@ -3974,16 +3962,14 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
* is exposed to the guest, disable AVIC.
*/
if (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC))
kvm_request_apicv_update(vcpu->kvm, false,
APICV_INHIBIT_REASON_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_request_apicv_update(vcpu->kvm, false,
APICV_INHIBIT_REASON_NESTED);
kvm_set_apicv_inhibit(kvm, APICV_INHIBIT_REASON_NESTED);
}
init_vmcb_after_set_cpuid(vcpu);
}
@ -4766,10 +4752,10 @@ static __init int svm_hardware_setup(void)
} else {
pr_info("TSC scaling supported\n");
kvm_has_tsc_control = true;
kvm_max_tsc_scaling_ratio = TSC_RATIO_MAX;
kvm_tsc_scaling_ratio_frac_bits = 32;
}
}
kvm_max_tsc_scaling_ratio = SVM_TSC_RATIO_MAX;
kvm_tsc_scaling_ratio_frac_bits = 32;
tsc_aux_uret_slot = kvm_add_user_return_msr(MSR_TSC_AUX);

15
arch/x86/kvm/svm/svm.h
View File

@ -22,6 +22,8 @@
#include <asm/svm.h>
#include <asm/sev-common.h>
#include "kvm_cache_regs.h"
#define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT)
#define IOPM_SIZE PAGE_SIZE * 3
@ -569,17 +571,6 @@ extern struct kvm_x86_nested_ops svm_nested_ops;
/* avic.c */
#define AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK (0xFF)
#define AVIC_LOGICAL_ID_ENTRY_VALID_BIT 31
#define AVIC_LOGICAL_ID_ENTRY_VALID_MASK (1 << 31)
#define AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK GENMASK_ULL(11, 0)
#define AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK (0xFFFFFFFFFFULL << 12)
#define AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK (1ULL << 62)
#define AVIC_PHYSICAL_ID_ENTRY_VALID_MASK (1ULL << 63)
#define VMCB_AVIC_APIC_BAR_MASK 0xFFFFFFFFFF000ULL
int avic_ga_log_notifier(u32 ga_tag);
void avic_vm_destroy(struct kvm *kvm);
int avic_vm_init(struct kvm *kvm);
@ -592,7 +583,7 @@ void __avic_vcpu_put(struct kvm_vcpu *vcpu);
void avic_apicv_post_state_restore(struct kvm_vcpu *vcpu);
void avic_set_virtual_apic_mode(struct kvm_vcpu *vcpu);
void avic_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu);
bool avic_check_apicv_inhibit_reasons(ulong bit);
bool avic_check_apicv_inhibit_reasons(enum kvm_apicv_inhibit reason);
void avic_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr);
void avic_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr);
bool avic_dy_apicv_has_pending_interrupt(struct kvm_vcpu *vcpu);

1
arch/x86/kvm/svm/svm_onhyperv.c
View File

@ -4,7 +4,6 @@
*/
#include <linux/kvm_host.h>
#include "kvm_cache_regs.h"
#include <asm/mshyperv.h>

22
arch/x86/kvm/trace.h
View File

@ -1339,23 +1339,25 @@ TRACE_EVENT(kvm_hv_stimer_cleanup,
__entry->vcpu_id, __entry->timer_index)
);
TRACE_EVENT(kvm_apicv_update_request,
TP_PROTO(bool activate, unsigned long bit),
TP_ARGS(activate, bit),
TRACE_EVENT(kvm_apicv_inhibit_changed,
TP_PROTO(int reason, bool set, unsigned long inhibits),
TP_ARGS(reason, set, inhibits),
TP_STRUCT__entry(
__field(bool, activate)
__field(unsigned long, bit)
__field(int, reason)
__field(bool, set)
__field(unsigned long, inhibits)
),
TP_fast_assign(
__entry->activate = activate;
__entry->bit = bit;
__entry->reason = reason;
__entry->set = set;
__entry->inhibits = inhibits;
),
TP_printk("%s bit=%lu",
__entry->activate ? "activate" : "deactivate",
__entry->bit)
TP_printk("%s reason=%u, inhibits=0x%lx",
__entry->set ? "set" : "cleared",
__entry->reason, __entry->inhibits)
);
TRACE_EVENT(kvm_apicv_accept_irq,

14
arch/x86/kvm/vmx/pmu_intel.c
View File

@ -389,6 +389,7 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
struct kvm_pmc *pmc;
u32 msr = msr_info->index;
u64 data = msr_info->data;
u64 reserved_bits;
switch (msr) {
case MSR_CORE_PERF_FIXED_CTR_CTRL:
@ -443,7 +444,11 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
} else if ((pmc = get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0))) {
if (data == pmc->eventsel)
return 0;
if (!(data & pmu->reserved_bits)) {
reserved_bits = pmu->reserved_bits;
if ((pmc->idx == 2) &&
(pmu->raw_event_mask & HSW_IN_TX_CHECKPOINTED))
reserved_bits ^= HSW_IN_TX_CHECKPOINTED;
if (!(data & reserved_bits)) {
reprogram_gp_counter(pmc, data);
return 0;
}
@ -485,6 +490,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
pmu->counter_bitmask[KVM_PMC_FIXED] = 0;
pmu->version = 0;
pmu->reserved_bits = 0xffffffff00200000ull;
pmu->raw_event_mask = X86_RAW_EVENT_MASK;
entry = kvm_find_cpuid_entry(vcpu, 0xa, 0);
if (!entry || !vcpu->kvm->arch.enable_pmu)
@ -533,8 +539,10 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
entry = kvm_find_cpuid_entry(vcpu, 7, 0);
if (entry &&
(boot_cpu_has(X86_FEATURE_HLE) || boot_cpu_has(X86_FEATURE_RTM)) &&
(entry->ebx & (X86_FEATURE_HLE|X86_FEATURE_RTM)))
pmu->reserved_bits ^= HSW_IN_TX|HSW_IN_TX_CHECKPOINTED;
(entry->ebx & (X86_FEATURE_HLE|X86_FEATURE_RTM))) {
pmu->reserved_bits ^= HSW_IN_TX;
pmu->raw_event_mask |= (HSW_IN_TX|HSW_IN_TX_CHECKPOINTED);
}
bitmap_set(pmu->all_valid_pmc_idx,
0, pmu->nr_arch_gp_counters);

26
arch/x86/kvm/vmx/vmx.c
View File

@ -2866,21 +2866,17 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
int vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
struct vmx_uret_msr *msr = vmx_find_uret_msr(vmx, MSR_EFER);
/* Nothing to do if hardware doesn't support EFER. */
if (!msr)
if (!vmx_find_uret_msr(vmx, MSR_EFER))
return 0;
vcpu->arch.efer = efer;
if (efer & EFER_LMA) {
vm_entry_controls_setbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE);
msr->data = efer;
} else {
vm_entry_controls_clearbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE);
if (efer & EFER_LMA)
vm_entry_controls_setbit(vmx, VM_ENTRY_IA32E_MODE);
else
vm_entry_controls_clearbit(vmx, VM_ENTRY_IA32E_MODE);
msr->data = efer & ~EFER_LME;
}
vmx_setup_uret_msrs(vmx);
return 0;
}
@ -2906,7 +2902,6 @@ static void enter_lmode(struct kvm_vcpu *vcpu)
static void exit_lmode(struct kvm_vcpu *vcpu)
{
vm_entry_controls_clearbit(to_vmx(vcpu), VM_ENTRY_IA32E_MODE);
vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA);
}
@ -7705,14 +7700,14 @@ static void vmx_hardware_unsetup(void)
free_kvm_area();
}
static bool vmx_check_apicv_inhibit_reasons(ulong bit)
static bool vmx_check_apicv_inhibit_reasons(enum kvm_apicv_inhibit reason)
{
ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE) |
BIT(APICV_INHIBIT_REASON_ABSENT) |
BIT(APICV_INHIBIT_REASON_HYPERV) |
BIT(APICV_INHIBIT_REASON_BLOCKIRQ);
return supported & BIT(bit);
return supported & BIT(reason);
}
static struct kvm_x86_ops vmx_x86_ops __initdata = {
@ -7980,12 +7975,11 @@ static __init int hardware_setup(void)
if (!enable_apicv)
vmx_x86_ops.sync_pir_to_irr = NULL;
if (cpu_has_vmx_tsc_scaling()) {
if (cpu_has_vmx_tsc_scaling())
kvm_has_tsc_control = true;
kvm_max_tsc_scaling_ratio = KVM_VMX_TSC_MULTIPLIER_MAX;
kvm_tsc_scaling_ratio_frac_bits = 48;
}
kvm_max_tsc_scaling_ratio = KVM_VMX_TSC_MULTIPLIER_MAX;
kvm_tsc_scaling_ratio_frac_bits = 48;
kvm_has_bus_lock_exit = cpu_has_vmx_bus_lock_detection();
set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */

161
arch/x86/kvm/x86.c
View File

@ -1748,9 +1748,6 @@ static int __kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data,
{
struct msr_data msr;
if (!host_initiated && !kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_WRITE))
return KVM_MSR_RET_FILTERED;
switch (index) {
case MSR_FS_BASE:
case MSR_GS_BASE:
@ -1832,9 +1829,6 @@ int __kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data,
struct msr_data msr;
int ret;
if (!host_initiated && !kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ))
return KVM_MSR_RET_FILTERED;
switch (index) {
case MSR_TSC_AUX:
if (!kvm_is_supported_user_return_msr(MSR_TSC_AUX))
@ -1871,6 +1865,20 @@ static int kvm_get_msr_ignored_check(struct kvm_vcpu *vcpu,
return ret;
}
static int kvm_get_msr_with_filter(struct kvm_vcpu *vcpu, u32 index, u64 *data)
{
if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ))
return KVM_MSR_RET_FILTERED;
return kvm_get_msr_ignored_check(vcpu, index, data, false);
}
static int kvm_set_msr_with_filter(struct kvm_vcpu *vcpu, u32 index, u64 data)
{
if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_WRITE))
return KVM_MSR_RET_FILTERED;
return kvm_set_msr_ignored_check(vcpu, index, data, false);
}
int kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data)
{
return kvm_get_msr_ignored_check(vcpu, index, data, false);
@ -1953,7 +1961,7 @@ int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu)
u64 data;
int r;
r = kvm_get_msr(vcpu, ecx, &data);
r = kvm_get_msr_with_filter(vcpu, ecx, &data);
if (!r) {
trace_kvm_msr_read(ecx, data);
@ -1978,7 +1986,7 @@ int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu)
u64 data = kvm_read_edx_eax(vcpu);
int r;
r = kvm_set_msr(vcpu, ecx, data);
r = kvm_set_msr_with_filter(vcpu, ecx, data);
if (!r) {
trace_kvm_msr_write(ecx, data);
@ -5938,7 +5946,7 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
smp_wmb();
kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT;
kvm->arch.nr_reserved_ioapic_pins = cap->args[0];
kvm_request_apicv_update(kvm, true, APICV_INHIBIT_REASON_ABSENT);
kvm_clear_apicv_inhibit(kvm, APICV_INHIBIT_REASON_ABSENT);
r = 0;
split_irqchip_unlock:
mutex_unlock(&kvm->lock);
@ -6335,7 +6343,7 @@ set_identity_unlock:
/* Write kvm->irq_routing before enabling irqchip_in_kernel. */
smp_wmb();
kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL;
kvm_request_apicv_update(kvm, true, APICV_INHIBIT_REASON_ABSENT);
kvm_clear_apicv_inhibit(kvm, APICV_INHIBIT_REASON_ABSENT);
create_irqchip_unlock:
mutex_unlock(&kvm->lock);
break;
@ -6726,7 +6734,7 @@ void kvm_get_segment(struct kvm_vcpu *vcpu,
static_call(kvm_x86_get_segment)(vcpu, var, seg);
}
gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access,
gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u64 access,
struct x86_exception *exception)
{
struct kvm_mmu *mmu = vcpu->arch.mmu;
@ -6746,7 +6754,7 @@ gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
{
struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
return mmu->gva_to_gpa(vcpu, mmu, gva, access, exception);
}
EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_read);
@ -6756,7 +6764,7 @@ EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_read);
{
struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
access |= PFERR_FETCH_MASK;
return mmu->gva_to_gpa(vcpu, mmu, gva, access, exception);
}
@ -6766,7 +6774,7 @@ gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
{
struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
access |= PFERR_WRITE_MASK;
return mmu->gva_to_gpa(vcpu, mmu, gva, access, exception);
}
@ -6782,7 +6790,7 @@ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
}
static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
struct kvm_vcpu *vcpu, u32 access,
struct kvm_vcpu *vcpu, u64 access,
struct x86_exception *exception)
{
struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
@ -6819,7 +6827,7 @@ static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
unsigned offset;
int ret;
@ -6844,7 +6852,7 @@ int kvm_read_guest_virt(struct kvm_vcpu *vcpu,
gva_t addr, void *val, unsigned int bytes,
struct x86_exception *exception)
{
u32 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0;
/*
* FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED
@ -6863,9 +6871,11 @@ static int emulator_read_std(struct x86_emulate_ctxt *ctxt,
struct x86_exception *exception, bool system)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
u32 access = 0;
u64 access = 0;
if (!system && static_call(kvm_x86_get_cpl)(vcpu) == 3)
if (system)
access |= PFERR_IMPLICIT_ACCESS;
else if (static_call(kvm_x86_get_cpl)(vcpu) == 3)
access |= PFERR_USER_MASK;
return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception);
@ -6881,7 +6891,7 @@ static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt,
}
static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
struct kvm_vcpu *vcpu, u32 access,
struct kvm_vcpu *vcpu, u64 access,
struct x86_exception *exception)
{
struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
@ -6915,9 +6925,11 @@ static int emulator_write_std(struct x86_emulate_ctxt *ctxt, gva_t addr, void *v
bool system)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
u32 access = PFERR_WRITE_MASK;
u64 access = PFERR_WRITE_MASK;
if (!system && static_call(kvm_x86_get_cpl)(vcpu) == 3)
if (system)
access |= PFERR_IMPLICIT_ACCESS;
else if (static_call(kvm_x86_get_cpl)(vcpu) == 3)
access |= PFERR_USER_MASK;
return kvm_write_guest_virt_helper(addr, val, bytes, vcpu,
@ -6984,7 +6996,7 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
bool write)
{
struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
u32 access = ((static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0)
u64 access = ((static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0)
| (write ? PFERR_WRITE_MASK : 0);
/*
@ -7627,13 +7639,13 @@ static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
return;
}
static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
u32 msr_index, u64 *pdata)
static int emulator_get_msr_with_filter(struct x86_emulate_ctxt *ctxt,
u32 msr_index, u64 *pdata)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
int r;
r = kvm_get_msr(vcpu, msr_index, pdata);
r = kvm_get_msr_with_filter(vcpu, msr_index, pdata);
if (r && kvm_msr_user_space(vcpu, msr_index, KVM_EXIT_X86_RDMSR, 0,
complete_emulated_rdmsr, r)) {
@ -7644,13 +7656,13 @@ static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
return r;
}
static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
u32 msr_index, u64 data)
static int emulator_set_msr_with_filter(struct x86_emulate_ctxt *ctxt,
u32 msr_index, u64 data)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
int r;
r = kvm_set_msr(vcpu, msr_index, data);
r = kvm_set_msr_with_filter(vcpu, msr_index, data);
if (r && kvm_msr_user_space(vcpu, msr_index, KVM_EXIT_X86_WRMSR, data,
complete_emulated_msr_access, r)) {
@ -7661,6 +7673,18 @@ static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
return r;
}
static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
u32 msr_index, u64 *pdata)
{
return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
}
static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
u32 msr_index, u64 data)
{
return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data);
}
static u64 emulator_get_smbase(struct x86_emulate_ctxt *ctxt)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
@ -7724,6 +7748,11 @@ static bool emulator_guest_has_fxsr(struct x86_emulate_ctxt *ctxt)
return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_FXSR);
}
static bool emulator_guest_has_rdpid(struct x86_emulate_ctxt *ctxt)
{
return guest_cpuid_has(emul_to_vcpu(ctxt), X86_FEATURE_RDPID);
}
static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg)
{
return kvm_register_read_raw(emul_to_vcpu(ctxt), reg);
@ -7794,6 +7823,8 @@ static const struct x86_emulate_ops emulate_ops = {
.set_dr = emulator_set_dr,
.get_smbase = emulator_get_smbase,
.set_smbase = emulator_set_smbase,
.set_msr_with_filter = emulator_set_msr_with_filter,
.get_msr_with_filter = emulator_get_msr_with_filter,
.set_msr = emulator_set_msr,
.get_msr = emulator_get_msr,
.check_pmc = emulator_check_pmc,
@ -7806,6 +7837,7 @@ static const struct x86_emulate_ops emulate_ops = {
.guest_has_long_mode = emulator_guest_has_long_mode,
.guest_has_movbe = emulator_guest_has_movbe,
.guest_has_fxsr = emulator_guest_has_fxsr,
.guest_has_rdpid = emulator_guest_has_rdpid,
.set_nmi_mask = emulator_set_nmi_mask,
.get_hflags = emulator_get_hflags,
.exiting_smm = emulator_exiting_smm,
@ -9058,15 +9090,29 @@ bool kvm_apicv_activated(struct kvm *kvm)
}
EXPORT_SYMBOL_GPL(kvm_apicv_activated);
static void set_or_clear_apicv_inhibit(unsigned long *inhibits,
enum kvm_apicv_inhibit reason, bool set)
{
if (set)
__set_bit(reason, inhibits);
else
__clear_bit(reason, inhibits);
trace_kvm_apicv_inhibit_changed(reason, set, *inhibits);
}
static void kvm_apicv_init(struct kvm *kvm)
{
unsigned long *inhibits = &kvm->arch.apicv_inhibit_reasons;
init_rwsem(&kvm->arch.apicv_update_lock);
set_bit(APICV_INHIBIT_REASON_ABSENT,
&kvm->arch.apicv_inhibit_reasons);
set_or_clear_apicv_inhibit(inhibits, APICV_INHIBIT_REASON_ABSENT, true);
if (!enable_apicv)
set_bit(APICV_INHIBIT_REASON_DISABLE,
&kvm->arch.apicv_inhibit_reasons);
set_or_clear_apicv_inhibit(inhibits,
APICV_INHIBIT_REASON_ABSENT, true);
}
static void kvm_sched_yield(struct kvm_vcpu *vcpu, unsigned long dest_id)
@ -9740,24 +9786,21 @@ out:
}
EXPORT_SYMBOL_GPL(kvm_vcpu_update_apicv);
void __kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
void __kvm_set_or_clear_apicv_inhibit(struct kvm *kvm,
enum kvm_apicv_inhibit reason, bool set)
{
unsigned long old, new;
lockdep_assert_held_write(&kvm->arch.apicv_update_lock);
if (!static_call(kvm_x86_check_apicv_inhibit_reasons)(bit))
if (!static_call(kvm_x86_check_apicv_inhibit_reasons)(reason))
return;
old = new = kvm->arch.apicv_inhibit_reasons;
if (activate)
__clear_bit(bit, &new);
else
__set_bit(bit, &new);
set_or_clear_apicv_inhibit(&new, reason, set);
if (!!old != !!new) {
trace_kvm_apicv_update_request(activate, bit);
/*
* Kick all vCPUs before setting apicv_inhibit_reasons to avoid
* false positives in the sanity check WARN in svm_vcpu_run().
@ -9776,20 +9819,22 @@ void __kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
unsigned long gfn = gpa_to_gfn(APIC_DEFAULT_PHYS_BASE);
kvm_zap_gfn_range(kvm, gfn, gfn+1);
}
} else
} else {
kvm->arch.apicv_inhibit_reasons = new;
}
}
void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
void kvm_set_or_clear_apicv_inhibit(struct kvm *kvm,
enum kvm_apicv_inhibit reason, bool set)
{
if (!enable_apicv)
return;
down_write(&kvm->arch.apicv_update_lock);
__kvm_request_apicv_update(kvm, activate, bit);
__kvm_set_or_clear_apicv_inhibit(kvm, reason, set);
up_write(&kvm->arch.apicv_update_lock);
}
EXPORT_SYMBOL_GPL(kvm_request_apicv_update);
EXPORT_SYMBOL_GPL(kvm_set_or_clear_apicv_inhibit);
static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
{
@ -10937,7 +10982,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
static void kvm_arch_vcpu_guestdbg_update_apicv_inhibit(struct kvm *kvm)
{
bool inhibit = false;
bool set = false;
struct kvm_vcpu *vcpu;
unsigned long i;
@ -10945,11 +10990,11 @@ static void kvm_arch_vcpu_guestdbg_update_apicv_inhibit(struct kvm *kvm)
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->guest_debug & KVM_GUESTDBG_BLOCKIRQ) {
inhibit = true;
set = true;
break;
}
}
__kvm_request_apicv_update(kvm, !inhibit, APICV_INHIBIT_REASON_BLOCKIRQ);
__kvm_set_or_clear_apicv_inhibit(kvm, APICV_INHIBIT_REASON_BLOCKIRQ, set);
up_write(&kvm->arch.apicv_update_lock);
}
@ -11557,10 +11602,8 @@ int kvm_arch_hardware_setup(void *opaque)
u64 max = min(0x7fffffffULL,
__scale_tsc(kvm_max_tsc_scaling_ratio, tsc_khz));
kvm_max_guest_tsc_khz = max;
kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits;
}
kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits;
kvm_init_msr_list();
return 0;
}
@ -11629,12 +11672,13 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
ret = kvm_page_track_init(kvm);
if (ret)
return ret;
goto out;
ret = kvm_mmu_init_vm(kvm);
if (ret)
goto out_page_track;
INIT_HLIST_HEAD(&kvm->arch.mask_notifier_list);
INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages);
INIT_LIST_HEAD(&kvm->arch.lpage_disallowed_mmu_pages);
INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
atomic_set(&kvm->arch.noncoherent_dma_count, 0);
@ -11666,10 +11710,14 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm_apicv_init(kvm);
kvm_hv_init_vm(kvm);
kvm_mmu_init_vm(kvm);
kvm_xen_init_vm(kvm);
return static_call(kvm_x86_vm_init)(kvm);
out_page_track:
kvm_page_track_cleanup(kvm);
out:
return ret;
}
int kvm_arch_post_init_vm(struct kvm *kvm)
@ -12593,7 +12641,7 @@ void kvm_fixup_and_inject_pf_error(struct kvm_vcpu *vcpu, gva_t gva, u16 error_c
{
struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
struct x86_exception fault;
u32 access = error_code &
u64 access = error_code &
(PFERR_WRITE_MASK | PFERR_FETCH_MASK | PFERR_USER_MASK);
if (!(error_code & PFERR_PRESENT_MASK) ||
@ -12933,7 +12981,6 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_ga_log);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_update_request);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_apicv_accept_irq);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_enter);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_vmgexit_exit);

7
arch/x86/kvm/xen.c
View File

@ -39,8 +39,8 @@ static int kvm_xen_shared_info_init(struct kvm *kvm, gfn_t gfn)
}
do {
ret = kvm_gfn_to_pfn_cache_init(kvm, gpc, NULL, false, true,
gpa, PAGE_SIZE, false);
ret = kvm_gfn_to_pfn_cache_init(kvm, gpc, NULL, KVM_HOST_USES_PFN,
gpa, PAGE_SIZE);
if (ret)
goto out;
@ -1025,8 +1025,7 @@ static int evtchn_set_fn(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm
break;
idx = srcu_read_lock(&kvm->srcu);
rc = kvm_gfn_to_pfn_cache_refresh(kvm, gpc, gpc->gpa,
PAGE_SIZE, false);
rc = kvm_gfn_to_pfn_cache_refresh(kvm, gpc, gpc->gpa, PAGE_SIZE);
srcu_read_unlock(&kvm->srcu, idx);
} while(!rc);

60
include/linux/kvm_host.h
View File

@ -148,6 +148,7 @@ static inline bool is_error_page(struct page *page)
#define KVM_REQUEST_MASK GENMASK(7,0)
#define KVM_REQUEST_NO_WAKEUP BIT(8)
#define KVM_REQUEST_WAIT BIT(9)
#define KVM_REQUEST_NO_ACTION BIT(10)
/*
* Architecture-independent vcpu->requests bit members
* Bits 4-7 are reserved for more arch-independent bits.
@ -156,9 +157,18 @@ static inline bool is_error_page(struct page *page)
#define KVM_REQ_VM_DEAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_UNBLOCK 2
#define KVM_REQ_UNHALT 3
#define KVM_REQ_GPC_INVALIDATE (5 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQUEST_ARCH_BASE 8
/*
* KVM_REQ_OUTSIDE_GUEST_MODE exists is purely as way to force the vCPU to
* OUTSIDE_GUEST_MODE. KVM_REQ_OUTSIDE_GUEST_MODE differs from a vCPU "kick"
* in that it ensures the vCPU has reached OUTSIDE_GUEST_MODE before continuing
* on. A kick only guarantees that the vCPU is on its way out, e.g. a previous
* kick may have set vcpu->mode to EXITING_GUEST_MODE, and so there's no
* guarantee the vCPU received an IPI and has actually exited guest mode.
*/
#define KVM_REQ_OUTSIDE_GUEST_MODE (KVM_REQUEST_NO_ACTION | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_ARCH_REQ_FLAGS(nr, flags) ({ \
BUILD_BUG_ON((unsigned)(nr) >= (sizeof_field(struct kvm_vcpu, requests) * 8) - KVM_REQUEST_ARCH_BASE); \
(unsigned)(((nr) + KVM_REQUEST_ARCH_BASE) | (flags)); \
@ -1221,27 +1231,27 @@ void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);
* @gpc: struct gfn_to_pfn_cache object.
* @vcpu: vCPU to be used for marking pages dirty and to be woken on
* invalidation.
* @guest_uses_pa: indicates that the resulting host physical PFN is used while
* @vcpu is IN_GUEST_MODE so invalidations should wake it.
* @kernel_map: requests a kernel virtual mapping (kmap / memremap).
* @usage: indicates if the resulting host physical PFN is used while
* the @vcpu is IN_GUEST_MODE (in which case invalidation of
* the cache from MMU notifiers---but not for KVM memslot
* changes!---will also force @vcpu to exit the guest and
* refresh the cache); and/or if the PFN used directly
* by KVM (and thus needs a kernel virtual mapping).
* @gpa: guest physical address to map.
* @len: sanity check; the range being access must fit a single page.
* @dirty: mark the cache dirty immediately.
*
* @return: 0 for success.
* -EINVAL for a mapping which would cross a page boundary.
* -EFAULT for an untranslatable guest physical address.
*
* This primes a gfn_to_pfn_cache and links it into the @kvm's list for
* invalidations to be processed. Invalidation callbacks to @vcpu using
* %KVM_REQ_GPC_INVALIDATE will occur only for MMU notifiers, not for KVM
* memslot changes. Callers are required to use kvm_gfn_to_pfn_cache_check()
* to ensure that the cache is valid before accessing the target page.
* invalidations to be processed. Callers are required to use
* kvm_gfn_to_pfn_cache_check() to ensure that the cache is valid before
* accessing the target page.
*/
int kvm_gfn_to_pfn_cache_init(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
struct kvm_vcpu *vcpu, bool guest_uses_pa,
bool kernel_map, gpa_t gpa, unsigned long len,
bool dirty);
struct kvm_vcpu *vcpu, enum pfn_cache_usage usage,
gpa_t gpa, unsigned long len);
/**
* kvm_gfn_to_pfn_cache_check - check validity of a gfn_to_pfn_cache.
@ -1250,7 +1260,6 @@ int kvm_gfn_to_pfn_cache_init(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
* @gpc: struct gfn_to_pfn_cache object.
* @gpa: current guest physical address to map.
* @len: sanity check; the range being access must fit a single page.
* @dirty: mark the cache dirty immediately.
*
* @return: %true if the cache is still valid and the address matches.
* %false if the cache is not valid.
@ -1272,7 +1281,6 @@ bool kvm_gfn_to_pfn_cache_check(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
* @gpc: struct gfn_to_pfn_cache object.
* @gpa: updated guest physical address to map.
* @len: sanity check; the range being access must fit a single page.
* @dirty: mark the cache dirty immediately.
*
* @return: 0 for success.
* -EINVAL for a mapping which would cross a page boundary.
@ -1285,7 +1293,7 @@ bool kvm_gfn_to_pfn_cache_check(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
* with the lock still held to permit access.
*/
int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
gpa_t gpa, unsigned long len, bool dirty);
gpa_t gpa, unsigned long len);
/**
* kvm_gfn_to_pfn_cache_unmap - temporarily unmap a gfn_to_pfn_cache.
@ -1293,10 +1301,9 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
* @kvm: pointer to kvm instance.
* @gpc: struct gfn_to_pfn_cache object.
*
* This unmaps the referenced page and marks it dirty, if appropriate. The
* cache is left in the invalid state but at least the mapping from GPA to
* userspace HVA will remain cached and can be reused on a subsequent
* refresh.
* This unmaps the referenced page. The cache is left in the invalid state
* but at least the mapping from GPA to userspace HVA will remain cached
* and can be reused on a subsequent refresh.
*/
void kvm_gfn_to_pfn_cache_unmap(struct kvm *kvm, struct gfn_to_pfn_cache *gpc);
@ -1984,7 +1991,7 @@ static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
void kvm_arch_irq_routing_update(struct kvm *kvm);
static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
static inline void __kvm_make_request(int req, struct kvm_vcpu *vcpu)
{
/*
* Ensure the rest of the request is published to kvm_check_request's
@ -1994,6 +2001,19 @@ static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
set_bit(req & KVM_REQUEST_MASK, (void *)&vcpu->requests);
}
static __always_inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
{
/*
* Request that don't require vCPU action should never be logged in
* vcpu->requests. The vCPU won't clear the request, so it will stay
* logged indefinitely and prevent the vCPU from entering the guest.
*/
BUILD_BUG_ON(!__builtin_constant_p(req) ||
(req & KVM_REQUEST_NO_ACTION));
__kvm_make_request(req, vcpu);
}
static inline bool kvm_request_pending(struct kvm_vcpu *vcpu)
{
return READ_ONCE(vcpu->requests);

11
include/linux/kvm_types.h
View File

@ -18,6 +18,7 @@ struct kvm_memslots;
enum kvm_mr_change;
#include <linux/bits.h>
#include <linux/types.h>
#include <linux/spinlock_types.h>
@ -46,6 +47,12 @@ typedef u64 hfn_t;
typedef hfn_t kvm_pfn_t;
enum pfn_cache_usage {
KVM_GUEST_USES_PFN = BIT(0),
KVM_HOST_USES_PFN = BIT(1),
KVM_GUEST_AND_HOST_USE_PFN = KVM_GUEST_USES_PFN | KVM_HOST_USES_PFN,
};
struct gfn_to_hva_cache {
u64 generation;
gpa_t gpa;
@ -64,11 +71,9 @@ struct gfn_to_pfn_cache {
rwlock_t lock;
void *khva;
kvm_pfn_t pfn;
enum pfn_cache_usage usage;
bool active;
bool valid;
bool dirty;
bool kernel_map;
bool guest_uses_pa;
};
#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE

22
virt/kvm/kvm_main.c
View File

@ -117,6 +117,8 @@ EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
static const struct file_operations stat_fops_per_vm;
static struct file_operations kvm_chardev_ops;
static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
unsigned long arg);
#ifdef CONFIG_KVM_COMPAT
@ -251,7 +253,8 @@ static void kvm_make_vcpu_request(struct kvm_vcpu *vcpu, unsigned int req,
{
int cpu;
kvm_make_request(req, vcpu);
if (likely(!(req & KVM_REQUEST_NO_ACTION)))
__kvm_make_request(req, vcpu);
if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu))
return;
@ -1131,6 +1134,16 @@ static struct kvm *kvm_create_vm(unsigned long type)
preempt_notifier_inc();
kvm_init_pm_notifier(kvm);
/*
* When the fd passed to this ioctl() is opened it pins the module,
* but try_module_get() also prevents getting a reference if the module
* is in MODULE_STATE_GOING (e.g. if someone ran "rmmod --wait").
*/
if (!try_module_get(kvm_chardev_ops.owner)) {
r = -ENODEV;
goto out_err;
}
return kvm;
out_err:
@ -1220,6 +1233,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
preempt_notifier_dec();
hardware_disable_all();
mmdrop(mm);
module_put(kvm_chardev_ops.owner);
}
void kvm_get_kvm(struct kvm *kvm)
@ -3663,7 +3677,7 @@ static int kvm_vcpu_release(struct inode *inode, struct file *filp)
return 0;
}
static struct file_operations kvm_vcpu_fops = {
static const struct file_operations kvm_vcpu_fops = {
.release = kvm_vcpu_release,
.unlocked_ioctl = kvm_vcpu_ioctl,
.mmap = kvm_vcpu_mmap,
@ -4714,7 +4728,7 @@ static long kvm_vm_compat_ioctl(struct file *filp,
}
#endif
static struct file_operations kvm_vm_fops = {
static const struct file_operations kvm_vm_fops = {
.release = kvm_vm_release,
.unlocked_ioctl = kvm_vm_ioctl,
.llseek = noop_llseek,
@ -5721,8 +5735,6 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
goto out_free_5;
kvm_chardev_ops.owner = module;
kvm_vm_fops.owner = module;
kvm_vcpu_fops.owner = module;
r = misc_register(&kvm_dev);
if (r) {

72
virt/kvm/pfncache.c
View File

@ -27,7 +27,7 @@ void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm, unsigned long start,
{
DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS);
struct gfn_to_pfn_cache *gpc;
bool wake_vcpus = false;
bool evict_vcpus = false;
spin_lock(&kvm->gpc_lock);
list_for_each_entry(gpc, &kvm->gpc_list, list) {
@ -40,41 +40,32 @@ void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm, unsigned long start,
/*
* If a guest vCPU could be using the physical address,
* it needs to be woken.
* it needs to be forced out of guest mode.
*/
if (gpc->guest_uses_pa) {
if (!wake_vcpus) {
wake_vcpus = true;
if (gpc->usage & KVM_GUEST_USES_PFN) {
if (!evict_vcpus) {
evict_vcpus = true;
bitmap_zero(vcpu_bitmap, KVM_MAX_VCPUS);
}
__set_bit(gpc->vcpu->vcpu_idx, vcpu_bitmap);
}
/*
* We cannot call mark_page_dirty() from here because
* this physical CPU might not have an active vCPU
* with which to do the KVM dirty tracking.
*
* Neither is there any point in telling the kernel MM
* that the underlying page is dirty. A vCPU in guest
* mode might still be writing to it up to the point
* where we wake them a few lines further down anyway.
*
* So all the dirty marking happens on the unmap.
*/
}
write_unlock_irq(&gpc->lock);
}
spin_unlock(&kvm->gpc_lock);
if (wake_vcpus) {
unsigned int req = KVM_REQ_GPC_INVALIDATE;
if (evict_vcpus) {
/*
* KVM needs to ensure the vCPU is fully out of guest context
* before allowing the invalidation to continue.
*/
unsigned int req = KVM_REQ_OUTSIDE_GUEST_MODE;
bool called;
/*
* If the OOM reaper is active, then all vCPUs should have
* been stopped already, so perform the request without
* KVM_REQUEST_WAIT and be sad if any needed to be woken.
* KVM_REQUEST_WAIT and be sad if any needed to be IPI'd.
*/
if (!may_block)
req &= ~KVM_REQUEST_WAIT;
@ -104,8 +95,7 @@ bool kvm_gfn_to_pfn_cache_check(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
}
EXPORT_SYMBOL_GPL(kvm_gfn_to_pfn_cache_check);
static void __release_gpc(struct kvm *kvm, kvm_pfn_t pfn, void *khva,
gpa_t gpa, bool dirty)
static void __release_gpc(struct kvm *kvm, kvm_pfn_t pfn, void *khva, gpa_t gpa)
{
/* Unmap the old page if it was mapped before, and release it */
if (!is_error_noslot_pfn(pfn)) {
@ -118,9 +108,7 @@ static void __release_gpc(struct kvm *kvm, kvm_pfn_t pfn, void *khva,
#endif
}
kvm_release_pfn(pfn, dirty);
if (dirty)
mark_page_dirty(kvm, gpa);
kvm_release_pfn(pfn, false);
}
}
@ -152,7 +140,7 @@ static kvm_pfn_t hva_to_pfn_retry(struct kvm *kvm, unsigned long uhva)
}
int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
gpa_t gpa, unsigned long len, bool dirty)
gpa_t gpa, unsigned long len)
{
struct kvm_memslots *slots = kvm_memslots(kvm);
unsigned long page_offset = gpa & ~PAGE_MASK;
@ -160,7 +148,7 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
unsigned long old_uhva;
gpa_t old_gpa;
void *old_khva;
bool old_valid, old_dirty;
bool old_valid;
int ret = 0;
/*
@ -177,20 +165,19 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
old_khva = gpc->khva - offset_in_page(gpc->khva);
old_uhva = gpc->uhva;
old_valid = gpc->valid;
old_dirty = gpc->dirty;
/* If the userspace HVA is invalid, refresh that first */
if (gpc->gpa != gpa || gpc->generation != slots->generation ||
kvm_is_error_hva(gpc->uhva)) {
gfn_t gfn = gpa_to_gfn(gpa);
gpc->dirty = false;
gpc->gpa = gpa;
gpc->generation = slots->generation;
gpc->memslot = __gfn_to_memslot(slots, gfn);
gpc->uhva = gfn_to_hva_memslot(gpc->memslot, gfn);
if (kvm_is_error_hva(gpc->uhva)) {
gpc->pfn = KVM_PFN_ERR_FAULT;
ret = -EFAULT;
goto out;
}
@ -219,7 +206,7 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
goto map_done;
}
if (gpc->kernel_map) {
if (gpc->usage & KVM_HOST_USES_PFN) {
if (new_pfn == old_pfn) {
new_khva = old_khva;
old_pfn = KVM_PFN_ERR_FAULT;
@ -255,14 +242,9 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
}
out:
if (ret)
gpc->dirty = false;
else
gpc->dirty = dirty;
write_unlock_irq(&gpc->lock);
__release_gpc(kvm, old_pfn, old_khva, old_gpa, old_dirty);
__release_gpc(kvm, old_pfn, old_khva, old_gpa);
return ret;
}
@ -272,7 +254,6 @@ void kvm_gfn_to_pfn_cache_unmap(struct kvm *kvm, struct gfn_to_pfn_cache *gpc)
{
void *old_khva;
kvm_pfn_t old_pfn;
bool old_dirty;
gpa_t old_gpa;
write_lock_irq(&gpc->lock);
@ -280,7 +261,6 @@ void kvm_gfn_to_pfn_cache_unmap(struct kvm *kvm, struct gfn_to_pfn_cache *gpc)
gpc->valid = false;
old_khva = gpc->khva - offset_in_page(gpc->khva);
old_dirty = gpc->dirty;
old_gpa = gpc->gpa;
old_pfn = gpc->pfn;
@ -293,16 +273,17 @@ void kvm_gfn_to_pfn_cache_unmap(struct kvm *kvm, struct gfn_to_pfn_cache *gpc)
write_unlock_irq(&gpc->lock);
__release_gpc(kvm, old_pfn, old_khva, old_gpa, old_dirty);
__release_gpc(kvm, old_pfn, old_khva, old_gpa);
}
EXPORT_SYMBOL_GPL(kvm_gfn_to_pfn_cache_unmap);
int kvm_gfn_to_pfn_cache_init(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
struct kvm_vcpu *vcpu, bool guest_uses_pa,
bool kernel_map, gpa_t gpa, unsigned long len,
bool dirty)
struct kvm_vcpu *vcpu, enum pfn_cache_usage usage,
gpa_t gpa, unsigned long len)
{
WARN_ON_ONCE(!usage || (usage & KVM_GUEST_AND_HOST_USE_PFN) != usage);
if (!gpc->active) {
rwlock_init(&gpc->lock);
@ -310,8 +291,7 @@ int kvm_gfn_to_pfn_cache_init(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
gpc->pfn = KVM_PFN_ERR_FAULT;
gpc->uhva = KVM_HVA_ERR_BAD;
gpc->vcpu = vcpu;
gpc->kernel_map = kernel_map;
gpc->guest_uses_pa = guest_uses_pa;
gpc->usage = usage;
gpc->valid = false;
gpc->active = true;
@ -319,7 +299,7 @@ int kvm_gfn_to_pfn_cache_init(struct kvm *kvm, struct gfn_to_pfn_cache *gpc,
list_add(&gpc->list, &kvm->gpc_list);
spin_unlock(&kvm->gpc_lock);
}
return kvm_gfn_to_pfn_cache_refresh(kvm, gpc, gpa, len, dirty);
return kvm_gfn_to_pfn_cache_refresh(kvm, gpc, gpa, len);
}
EXPORT_SYMBOL_GPL(kvm_gfn_to_pfn_cache_init);