Commit Graph

379 Commits

Author SHA1 Message Date
Linus Torvalds
a89ef2aa55 Add TDX guest attestation infrastructure and driver
-----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEV76QKkVc4xCGURexaDWVMHDJkrAFAmOXYmwACgkQaDWVMHDJ
 krD8hg/+J0hUTfljmlCctwGZyqVR3Y2E722wL9oTvbgYiUAtFrARzfPF0WNwvHi5
 Ywvod5hQ4unPoluthdVAD/uJqcPVhjIZ7CvNTGrS8J7ED5x5ydGLNWAL3Rn+9s6O
 xkz/DsV4zl+cPQ60XLsO+3Mc6RhwVs9DUthpUovl22epmgmRPCovkHWkvQsZajJq
 ceF/78ThfrkG4dDouaIXi1gsmKLLzU4KdHeBATMg0bgPQXFJZSGBCLaeJXWmLapq
 7N3SznUqDMn4Plr/IuP4XuMA6VTVojrakCcBmw5SGVqhkVWGM1/FMg7jHSQS7Z5V
 5uG7CkhTBqh17v9xKwDMPh34D51TLtNifA7jbecyL5155czFkj7BoSwEFINU/wCz
 agUO9NvK9j1chUnA2UGqGQigM3nWGZHMwaQjfgBWyq5gqF8HURUUrjx6XuunOfmB
 1byyrDu0g48u/zaQ/RpNfewz1ZY+WylDPcqOhYaVWF1PYThStML/VMBKpdsl1Ovw
 nytUdQsaBIjFHQdB+snizaF93+/0FG+FTGAlDnHYmey/8plL2LYuzrcDnDYnGEXa
 tN3HFd2lAi4JBLmvmgF39gH+BLXuKTLweIhwTXZTn91cfire3yxiXAnLd0tuptMP
 aXFddxKMdMpxTqzy2X+8gJjqCr2lZ9gZkxaPsWwrBM+xrJf0p2w=
 =JGnq
 -----END PGP SIGNATURE-----

Merge tag 'x86_tdx_for_6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 tdx updates from Dave Hansen:
 "This includes a single chunk of new functionality for TDX guests which
  allows them to talk to the trusted TDX module software and obtain an
  attestation report.

  This report can then be used to prove the trustworthiness of the guest
  to a third party and get access to things like storage encryption
  keys"

* tag 'x86_tdx_for_6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  selftests/tdx: Test TDX attestation GetReport support
  virt: Add TDX guest driver
  x86/tdx: Add a wrapper to get TDREPORT0 from the TDX Module
2022-12-12 14:27:49 -08:00
David Matlack
34e30ebbe4 KVM: Document the interaction between KVM_CAP_HALT_POLL and halt_poll_ns
Clarify the existing documentation about how KVM_CAP_HALT_POLL and
halt_poll_ns interact to make it clear that VMs using KVM_CAP_HALT_POLL
ignore halt_poll_ns.

Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20221201195249.3369720-3-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-12-02 13:20:30 -05:00
David Matlack
b8b43a4c2e KVM: Move halt-polling documentation into common directory
Move halt-polling.rst into the common KVM documentation directory and
out of the x86-specific directory. Halt-polling is a common feature and
the existing documentation is already written as such.

Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20221201195249.3369720-2-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-12-02 13:20:30 -05:00
Kuppuswamy Sathyanarayanan
6c8c1406a6 virt: Add TDX guest driver
TDX guest driver exposes IOCTL interfaces to service TDX guest
user-specific requests. Currently, it is only used to allow the user to
get the TDREPORT to support TDX attestation.

Details about the TDX attestation process are documented in
Documentation/x86/tdx.rst, and the IOCTL details are documented in
Documentation/virt/coco/tdx-guest.rst.

Operations like getting TDREPORT involves sending a blob of data as
input and getting another blob of data as output. It was considered
to use a sysfs interface for this, but it doesn't fit well into the
standard sysfs model for configuring values. It would be possible to
do read/write on files, but it would need multiple file descriptors,
which would be somewhat messy. IOCTLs seem to be the best fitting
and simplest model for this use case. The AMD sev-guest driver also
uses the IOCTL interface to support attestation.

[Bagas Sanjaya: Ack is for documentation portion]
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Kai Huang <kai.huang@intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/all/20221116223820.819090-3-sathyanarayanan.kuppuswamy%40linux.intel.com
2022-11-17 11:04:23 -08:00
Nico Boehr
6973091d1b KVM: s390: pv: don't allow userspace to set the clock under PV
When running under PV, the guest's TOD clock is under control of the
ultravisor and the hypervisor isn't allowed to change it. Hence, don't
allow userspace to change the guest's TOD clock by returning
-EOPNOTSUPP.

When userspace changes the guest's TOD clock, KVM updates its
kvm.arch.epoch field and, in addition, the epoch field in all state
descriptions of all VCPUs.

But, under PV, the ultravisor will ignore the epoch field in the state
description and simply overwrite it on next SIE exit with the actual
guest epoch. This leads to KVM having an incorrect view of the guest's
TOD clock: it has updated its internal kvm.arch.epoch field, but the
ultravisor ignores the field in the state description.

Whenever a guest is now waiting for a clock comparator, KVM will
incorrectly calculate the time when the guest should wake up, possibly
causing the guest to sleep for much longer than expected.

With this change, kvm_s390_set_tod() will now take the kvm->lock to be
able to call kvm_s390_pv_is_protected(). Since kvm_s390_set_tod_clock()
also takes kvm->lock, use __kvm_s390_set_tod_clock() instead.

The function kvm_s390_set_tod_clock is now unused, hence remove it.
Update the documentation to indicate the TOD clock attr calls can now
return -EOPNOTSUPP.

Fixes: 0f30350471 ("KVM: s390: protvirt: Do only reset registers that are accessible")
Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20221011160712.928239-2-nrb@linux.ibm.com
Message-Id: <20221011160712.928239-2-nrb@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
2022-11-07 10:14:15 +01:00
Linus Torvalds
f311d498be ARM:
* Fixes for single-stepping in the presence of an async
   exception as well as the preservation of PSTATE.SS
 
 * Better handling of AArch32 ID registers on AArch64-only
   systems
 
 * Fixes for the dirty-ring API, allowing it to work on
   architectures with relaxed memory ordering
 
 * Advertise the new kvmarm mailing list
 
 * Various minor cleanups and spelling fixes
 
 RISC-V:
 
 * Improved instruction encoding infrastructure for
   instructions not yet supported by binutils
 
 * Svinval support for both KVM Host and KVM Guest
 
 * Zihintpause support for KVM Guest
 
 * Zicbom support for KVM Guest
 
 * Record number of signal exits as a VCPU stat
 
 * Use generic guest entry infrastructure
 
 x86:
 
 * Misc PMU fixes and cleanups.
 
 * selftests: fixes for Hyper-V hypercall
 
 * selftests: fix nx_huge_pages_test on TDP-disabled hosts
 
 * selftests: cleanups for fix_hypercall_test
 -----BEGIN PGP SIGNATURE-----
 
 iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmM7OcMUHHBib256aW5p
 QHJlZGhhdC5jb20ACgkQv/vSX3jHroPAFgf/Rqc9hrXZVdbh2OZ+gScSsFsPK1zO
 DISUksLcXaYVYYsvQAEg/N2BPz3XbmO4jA+z8bIUrYTA7fC98we2C4jfR+EaX/fO
 +/Kzf0lAgu/nQZyFzUya+1jRsZqvVbC/HmDCI2kzN4u78e/LZ7NVcMijdV/ly6ib
 cq0b0LLqJHe/fcpJ806JZP3p5sndQhDmlUkZ2AWZf6CUKSEFcufbbYkt+84ZK4PL
 N9mEqXYQ3DXClLQmIBv+NZhtGlmADkWDE4BNouw8dVxhaXH7Hw/jfBHdb6SSHMRe
 tQ6Src1j8AYOhf5J35SMudgkbGcMelm0yeZ7Sizk+5Ft0EmdbZsnkvsGdQ==
 =4RA+
 -----END PGP SIGNATURE-----

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull more kvm updates from Paolo Bonzini:
 "The main batch of ARM + RISC-V changes, and a few fixes and cleanups
  for x86 (PMU virtualization and selftests).

  ARM:

   - Fixes for single-stepping in the presence of an async exception as
     well as the preservation of PSTATE.SS

   - Better handling of AArch32 ID registers on AArch64-only systems

   - Fixes for the dirty-ring API, allowing it to work on architectures
     with relaxed memory ordering

   - Advertise the new kvmarm mailing list

   - Various minor cleanups and spelling fixes

  RISC-V:

   - Improved instruction encoding infrastructure for instructions not
     yet supported by binutils

   - Svinval support for both KVM Host and KVM Guest

   - Zihintpause support for KVM Guest

   - Zicbom support for KVM Guest

   - Record number of signal exits as a VCPU stat

   - Use generic guest entry infrastructure

  x86:

   - Misc PMU fixes and cleanups.

   - selftests: fixes for Hyper-V hypercall

   - selftests: fix nx_huge_pages_test on TDP-disabled hosts

   - selftests: cleanups for fix_hypercall_test"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (57 commits)
  riscv: select HAVE_POSIX_CPU_TIMERS_TASK_WORK
  RISC-V: KVM: Use generic guest entry infrastructure
  RISC-V: KVM: Record number of signal exits as a vCPU stat
  RISC-V: KVM: add __init annotation to riscv_kvm_init()
  RISC-V: KVM: Expose Zicbom to the guest
  RISC-V: KVM: Provide UAPI for Zicbom block size
  RISC-V: KVM: Make ISA ext mappings explicit
  RISC-V: KVM: Allow Guest use Zihintpause extension
  RISC-V: KVM: Allow Guest use Svinval extension
  RISC-V: KVM: Use Svinval for local TLB maintenance when available
  RISC-V: Probe Svinval extension form ISA string
  RISC-V: KVM: Change the SBI specification version to v1.0
  riscv: KVM: Apply insn-def to hlv encodings
  riscv: KVM: Apply insn-def to hfence encodings
  riscv: Introduce support for defining instructions
  riscv: Add X register names to gpr-nums
  KVM: arm64: Advertise new kvmarm mailing list
  kvm: vmx: keep constant definition format consistent
  kvm: mmu: fix typos in struct kvm_arch
  KVM: selftests: Fix nx_huge_pages_test on TDP-disabled hosts
  ...
2022-10-11 20:07:44 -07:00
Linus Torvalds
3604a7f568 This update includes the following changes:
API:
 
 - Feed untrusted RNGs into /dev/random.
 - Allow HWRNG sleeping to be more interruptible.
 - Create lib/utils module.
 - Setting private keys no longer required for akcipher.
 - Remove tcrypt mode=1000.
 - Reorganised Kconfig entries.
 
 Algorithms:
 
 - Load x86/sha512 based on CPU features.
 - Add AES-NI/AVX/x86_64/GFNI assembler implementation of aria cipher.
 
 Drivers:
 
 - Add HACE crypto driver aspeed.
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEn51F/lCuNhUwmDeSxycdCkmxi6cFAmM785cACgkQxycdCkmx
 i6dveBAAmGVYtrPmcGfA6CmzZ8ps9KdZxhjHjzLKwuqrOMulZvE2IYeUV4QtNqpQ
 6NLY2+TkqL0XIbCXoByIk32lMYIlXBaJdMYdHHDTeo7E2wqZn/46SPSWeNKazyJx
 dkL8Oj62nqDc2s0LOi3vLvod+sENFQ69R+vkHOa0fZhX0UBsac3NIXo+74Y2A7bE
 0+iQFKTWdNnoQzQ0j4q8WMiolKYh21iPZ9l5sjgMgichLCaE6PrITlRcaWrtPhey
 U1OmJtbTPsg+5X1r9KyLtoAXtBDONl66GQyne+p/ZYD8cMhxomjJaPlMhwWE/n4d
 d2KJKvoXoPPo4c+yNIS9hBav07ZriPl0q0jd2M1rd6oYTmFpaodTgIBfjvxO+wfV
 GoqDS8PEc42U1uwkuKC/cvfr6pB8WiybfXy+vSXBm/jUgIOO3y+eqsC8Jx9ZoQeG
 F+d34PYfJrJbmDRtcA6ZKdzN0OmKq7aCilx1kGKGPg0D+uq64FBo7zsT6XzTK8HL
 2Za9AACPn87xLQwGrKDSBfyrlSSIJm2FaIIPayUXHEo7cyoiZwbTpXRRJ1mDR+v9
 jzI+xPEXCthtjysuRmufNhTkiZUv3lZ8ORfQ0QFKR53tjZUm+dVQo0V/N/ZSXoSV
 SyRvXYO+ToXePAofNWl1LcO1grX/vxtFNedMkDLHXooRcnCaIYo=
 =rq2f
 -----END PGP SIGNATURE-----

Merge tag 'v6.1-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

Pull crypto updates from Herbert Xu:
 "API:
   - Feed untrusted RNGs into /dev/random
   - Allow HWRNG sleeping to be more interruptible
   - Create lib/utils module
   - Setting private keys no longer required for akcipher
   - Remove tcrypt mode=1000
   - Reorganised Kconfig entries

  Algorithms:
   - Load x86/sha512 based on CPU features
   - Add AES-NI/AVX/x86_64/GFNI assembler implementation of aria cipher

  Drivers:
   - Add HACE crypto driver aspeed"

* tag 'v6.1-p1' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (124 commits)
  crypto: aspeed - Remove redundant dev_err call
  crypto: scatterwalk - Remove unused inline function scatterwalk_aligned()
  crypto: aead - Remove unused inline functions from aead
  crypto: bcm - Simplify obtain the name for cipher
  crypto: marvell/octeontx - use sysfs_emit() to instead of scnprintf()
  hwrng: core - start hwrng kthread also for untrusted sources
  crypto: zip - remove the unneeded result variable
  crypto: qat - add limit to linked list parsing
  crypto: octeontx2 - Remove the unneeded result variable
  crypto: ccp - Remove the unneeded result variable
  crypto: aspeed - Fix check for platform_get_irq() errors
  crypto: virtio - fix memory-leak
  crypto: cavium - prevent integer overflow loading firmware
  crypto: marvell/octeontx - prevent integer overflows
  crypto: aspeed - fix build error when only CRYPTO_DEV_ASPEED is enabled
  crypto: hisilicon/qm - fix the qos value initialization
  crypto: sun4i-ss - use DEFINE_SHOW_ATTRIBUTE to simplify sun4i_ss_debugfs
  crypto: tcrypt - add async speed test for aria cipher
  crypto: aria-avx - add AES-NI/AVX/x86_64/GFNI assembler implementation of aria cipher
  crypto: aria - prepare generic module for optimized implementations
  ...
2022-10-10 13:04:25 -07:00
Linus Torvalds
ef688f8b8c The first batch of KVM patches, mostly covering x86, which I
am sending out early due to me travelling next week.  There is a
 lone mm patch for which Andrew gave an informal ack at
 https://lore.kernel.org/linux-mm/20220817102500.440c6d0a3fce296fdf91bea6@linux-foundation.org.
 
 I will send the bulk of ARM work, as well as other
 architectures, at the end of next week.
 
 ARM:
 
 * Account stage2 page table allocations in memory stats.
 
 x86:
 
 * Account EPT/NPT arm64 page table allocations in memory stats.
 
 * Tracepoint cleanups/fixes for nested VM-Enter and emulated MSR accesses.
 
 * Drop eVMCS controls filtering for KVM on Hyper-V, all known versions of
   Hyper-V now support eVMCS fields associated with features that are
   enumerated to the guest.
 
 * Use KVM's sanitized VMCS config as the basis for the values of nested VMX
   capabilities MSRs.
 
 * A myriad event/exception fixes and cleanups.  Most notably, pending
   exceptions morph into VM-Exits earlier, as soon as the exception is
   queued, instead of waiting until the next vmentry.  This fixed
   a longstanding issue where the exceptions would incorrecly become
   double-faults instead of triggering a vmexit; the common case of
   page-fault vmexits had a special workaround, but now it's fixed
   for good.
 
 * A handful of fixes for memory leaks in error paths.
 
 * Cleanups for VMREAD trampoline and VMX's VM-Exit assembly flow.
 
 * Never write to memory from non-sleepable kvm_vcpu_check_block()
 
 * Selftests refinements and cleanups.
 
 * Misc typo cleanups.
 
 Generic:
 
 * remove KVM_REQ_UNHALT
 -----BEGIN PGP SIGNATURE-----
 
 iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmM2zwcUHHBib256aW5p
 QHJlZGhhdC5jb20ACgkQv/vSX3jHroNpbwf+MlVeOlzE5SBdrJ0TEnLmKUel1lSz
 QnZzP5+D65oD0zhCilUZHcg6G4mzZ5SdVVOvrGJvA0eXh25ruLNMF6jbaABkMLk/
 FfI1ybN7A82hwJn/aXMI/sUurWv4Jteaad20JC2DytBCnsW8jUqc49gtXHS2QWy4
 3uMsFdpdTAg4zdJKgEUfXBmQviweVpjjl3ziRyZZ7yaeo1oP7XZ8LaE1nR2l5m0J
 mfjzneNm5QAnueypOh5KhSwIvqf6WHIVm/rIHDJ1HIFbgfOU0dT27nhb1tmPwAcE
 +cJnnMUHjZqtCXteHkAxMClyRq0zsEoKk0OGvSOOMoq3Q0DavSXUNANOig==
 =/hqX
 -----END PGP SIGNATURE-----

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm updates from Paolo Bonzini:
 "The first batch of KVM patches, mostly covering x86.

  ARM:

   - Account stage2 page table allocations in memory stats

  x86:

   - Account EPT/NPT arm64 page table allocations in memory stats

   - Tracepoint cleanups/fixes for nested VM-Enter and emulated MSR
     accesses

   - Drop eVMCS controls filtering for KVM on Hyper-V, all known
     versions of Hyper-V now support eVMCS fields associated with
     features that are enumerated to the guest

   - Use KVM's sanitized VMCS config as the basis for the values of
     nested VMX capabilities MSRs

   - A myriad event/exception fixes and cleanups. Most notably, pending
     exceptions morph into VM-Exits earlier, as soon as the exception is
     queued, instead of waiting until the next vmentry. This fixed a
     longstanding issue where the exceptions would incorrecly become
     double-faults instead of triggering a vmexit; the common case of
     page-fault vmexits had a special workaround, but now it's fixed for
     good

   - A handful of fixes for memory leaks in error paths

   - Cleanups for VMREAD trampoline and VMX's VM-Exit assembly flow

   - Never write to memory from non-sleepable kvm_vcpu_check_block()

   - Selftests refinements and cleanups

   - Misc typo cleanups

  Generic:

   - remove KVM_REQ_UNHALT"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (94 commits)
  KVM: remove KVM_REQ_UNHALT
  KVM: mips, x86: do not rely on KVM_REQ_UNHALT
  KVM: x86: never write to memory from kvm_vcpu_check_block()
  KVM: x86: Don't snapshot pending INIT/SIPI prior to checking nested events
  KVM: nVMX: Make event request on VMXOFF iff INIT/SIPI is pending
  KVM: nVMX: Make an event request if INIT or SIPI is pending on VM-Enter
  KVM: SVM: Make an event request if INIT or SIPI is pending when GIF is set
  KVM: x86: lapic does not have to process INIT if it is blocked
  KVM: x86: Rename kvm_apic_has_events() to make it INIT/SIPI specific
  KVM: x86: Rename and expose helper to detect if INIT/SIPI are allowed
  KVM: nVMX: Make an event request when pending an MTF nested VM-Exit
  KVM: x86: make vendor code check for all nested events
  mailmap: Update Oliver's email address
  KVM: x86: Allow force_emulation_prefix to be written without a reload
  KVM: selftests: Add an x86-only test to verify nested exception queueing
  KVM: selftests: Use uapi header to get VMX and SVM exit reasons/codes
  KVM: x86: Rename inject_pending_events() to kvm_check_and_inject_events()
  KVM: VMX: Update MTF and ICEBP comments to document KVM's subtle behavior
  KVM: x86: Treat pending TRIPLE_FAULT requests as pending exceptions
  KVM: x86: Morph pending exceptions to pending VM-Exits at queue time
  ...
2022-10-09 09:39:55 -07:00
Paolo Bonzini
fe4d9e4abf KVM/arm64 updates for v6.1
- Fixes for single-stepping in the presence of an async
   exception as well as the preservation of PSTATE.SS
 
 - Better handling of AArch32 ID registers on AArch64-only
   systems
 
 - Fixes for the dirty-ring API, allowing it to work on
   architectures with relaxed memory ordering
 
 - Advertise the new kvmarm mailing list
 
 - Various minor cleanups and spelling fixes
 -----BEGIN PGP SIGNATURE-----
 
 iQJDBAABCgAtFiEEn9UcU+C1Yxj9lZw9I9DQutE9ekMFAmM5hQcPHG1hekBrZXJu
 ZWwub3JnAAoJECPQ0LrRPXpDoMUP/jra4HSmujLUB5G7Op8HxuurEecOc6xtw0Af
 AbDLlVc2Vs4rrdVh8GMc8D80atUAVitp8IFjdp/PzI2GTBTzWz43Gav2AbhgIJbJ
 xoFVHL8LkdHKyMbq10359DqGMqhIf41OFzGwhbzcx2V4pKNkSpjbCpu3bi/+Ybjg
 006ZpZc7NAU0rZgw9Flb/dhn0jw7RMc3orhoDQ4tBp1P/VhvqvgFt5bWipkvvBP7
 +lQK28ujG3ghST/hKRhg6ozgy5+6NEEHMuhErMYP8nIivRchX+pWF2Lb0qGH1e+U
 v2MZIZnIIUjyTV1vbYlxtltzfYmPuQ2MFNUBawI9tmlIOU9vJSCzeJS64uWK4KLV
 kbmk57OfC7rQoSNJH4jaKQp0YpIktrB9Vei97t4I7NwEmkjQj6cLTgg4tQrNqTiQ
 cFGeC9mE+lhFC8z1lCbna2eG631FxpPrB1SJ1/CU9wboam9dUfXGIvBPh+i2pvMZ
 vcxzUZJ11y+/uhp4k8i2PBwNno0iwRXd5MinwRUs2CR5vhs8qa5y7FVWKyqKpgI2
 xqr4lYTixJZL3mWkYyOQuClrTbT1zkoaPldLq6M7wvO08+QV8ryMeyKT+9s/gNQU
 dcYSwBCWZaOZm2nN8/zjxRb7VqZVu3cwyXi9XXUWNTCgIe/Q/SDPbXU/Hwbgzf8X
 UsQF7e9A
 =aNPK
 -----END PGP SIGNATURE-----

Merge tag 'kvmarm-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/arm64 updates for v6.1

- Fixes for single-stepping in the presence of an async
  exception as well as the preservation of PSTATE.SS

- Better handling of AArch32 ID registers on AArch64-only
  systems

- Fixes for the dirty-ring API, allowing it to work on
  architectures with relaxed memory ordering

- Advertise the new kvmarm mailing list

- Various minor cleanups and spelling fixes
2022-10-03 15:33:32 -04:00
Marc Zyngier
671c8c7f9f KVM: Document weakly ordered architecture requirements for dirty ring
Now that the kernel can expose to userspace that its dirty ring
management relies on explicit ordering, document these new requirements
for VMMs to do the right thing.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20220926145120.27974-5-maz@kernel.org
2022-09-29 10:23:08 +01:00
Akhil Raj
7f77ebbf75 Delete duplicate words from kernel docs
I have deleted duplicate words like

to, guest, trace, when, we

Signed-off-by: Akhil Raj <lf32.dev@gmail.com>
Link: https://lore.kernel.org/r/20220829065239.4531-1-lf32.dev@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-09-27 13:21:43 -06:00
Paolo Bonzini
c59fb12758 KVM: remove KVM_REQ_UNHALT
KVM_REQ_UNHALT is now unnecessary because it is replaced by the return
value of kvm_vcpu_block/kvm_vcpu_halt.  Remove it.

No functional change intended.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Message-Id: <20220921003201.1441511-13-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-09-26 12:37:21 -04:00
Aaron Lewis
b5cb32b16c KVM: x86: Delete duplicate documentation for KVM_X86_SET_MSR_FILTER
Two copies of KVM_X86_SET_MSR_FILTER somehow managed to make it's way
into the documentation.  Remove one copy and merge the difference from
the removed copy into the copy that's being kept.

Fixes: fd49e8ee70 ("Merge branch 'kvm-sev-cgroup' into HEAD")
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Link: https://lore.kernel.org/r/20220712001045.2364298-2-aaronlewis@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-09-26 12:02:29 -04:00
Jacky Li
d8da2da21f crypto: ccp - Initialize PSP when reading psp data file failed
Currently the OS fails the PSP initialization when the file specified at
'init_ex_path' does not exist or has invalid content. However the SEV
spec just requires users to allocate 32KB of 0xFF in the file, which can
be taken care of by the OS easily.

To improve the robustness during the PSP init, leverage the retry
mechanism and continue the init process:

Before the first INIT_EX call, if the content is invalid or missing,
continue the process by feeding those contents into PSP instead of
aborting. PSP will then override it with 32KB 0xFF and return
SEV_RET_SECURE_DATA_INVALID status code. In the second INIT_EX call,
this 32KB 0xFF content will then be fed and PSP will write the valid
data to the file.

In order to do this, sev_read_init_ex_file should only be called once
for the first INIT_EX call. Calling it again for the second INIT_EX call
will cause the invalid file content overwriting the valid 32KB 0xFF data
provided by PSP in the first INIT_EX call.

Co-developed-by: Peter Gonda <pgonda@google.com>
Signed-off-by: Peter Gonda <pgonda@google.com>
Signed-off-by: Jacky Li <jackyli@google.com>
Reported-by: Alper Gun <alpergun@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2022-08-26 18:50:07 +08:00
Bagas Sanjaya
19a7cc817a KVM: x86/MMU: properly format KVM_CAP_VM_DISABLE_NX_HUGE_PAGES capability table
There is unexpected warning on KVM_CAP_VM_DISABLE_NX_HUGE_PAGES capability
table, which cause the table to be rendered as paragraph text instead.

The warning is due to missing colon at capability name and returns keyword,
as well as improper alignment on multi-line returns field.

Fix the warning by adding missing colons and aligning the field.

Link: https://lore.kernel.org/lkml/20220627181937.3be67263@canb.auug.org.au/
Fixes: 084cc29f8b ("KVM: x86/MMU: Allow NX huge pages to be disabled on a per-vm basis")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: David Matlack <dmatlack@google.com>
Cc: Ben Gardon <bgardon@google.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-next@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Message-Id: <20220627095151.19339-3-bagasdotme@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-08-11 02:35:37 -04:00
Bagas Sanjaya
b4aed4d85f Documentation: KVM: extend KVM_CAP_VM_DISABLE_NX_HUGE_PAGES heading underline
Extend heading underline for KVM_CAP_VM_DISABLE_NX_HUGE_PAGE to match
the heading text length.

Link: https://lore.kernel.org/lkml/20220627181937.3be67263@canb.auug.org.au/
Fixes: 084cc29f8b ("KVM: x86/MMU: Allow NX huge pages to be disabled on a per-vm basis")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: David Matlack <dmatlack@google.com>
Cc: Ben Gardon <bgardon@google.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-next@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Message-Id: <20220627095151.19339-2-bagasdotme@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-08-11 02:35:36 -04:00
Linus Torvalds
7c5c3a6177 ARM:
* Unwinder implementations for both nVHE modes (classic and
   protected), complete with an overflow stack
 
 * Rework of the sysreg access from userspace, with a complete
   rewrite of the vgic-v3 view to allign with the rest of the
   infrastructure
 
 * Disagregation of the vcpu flags in separate sets to better track
   their use model.
 
 * A fix for the GICv2-on-v3 selftest
 
 * A small set of cosmetic fixes
 
 RISC-V:
 
 * Track ISA extensions used by Guest using bitmap
 
 * Added system instruction emulation framework
 
 * Added CSR emulation framework
 
 * Added gfp_custom flag in struct kvm_mmu_memory_cache
 
 * Added G-stage ioremap() and iounmap() functions
 
 * Added support for Svpbmt inside Guest
 
 s390:
 
 * add an interface to provide a hypervisor dump for secure guests
 
 * improve selftests to use TAP interface
 
 * enable interpretive execution of zPCI instructions (for PCI passthrough)
 
 * First part of deferred teardown
 
 * CPU Topology
 
 * PV attestation
 
 * Minor fixes
 
 x86:
 
 * Permit guests to ignore single-bit ECC errors
 
 * Intel IPI virtualization
 
 * Allow getting/setting pending triple fault with KVM_GET/SET_VCPU_EVENTS
 
 * PEBS virtualization
 
 * Simplify PMU emulation by just using PERF_TYPE_RAW events
 
 * More accurate event reinjection on SVM (avoid retrying instructions)
 
 * Allow getting/setting the state of the speaker port data bit
 
 * Refuse starting the kvm-intel module if VM-Entry/VM-Exit controls are inconsistent
 
 * "Notify" VM exit (detect microarchitectural hangs) for Intel
 
 * Use try_cmpxchg64 instead of cmpxchg64
 
 * Ignore benign host accesses to PMU MSRs when PMU is disabled
 
 * Allow disabling KVM's "MONITOR/MWAIT are NOPs!" behavior
 
 * Allow NX huge page mitigation to be disabled on a per-vm basis
 
 * Port eager page splitting to shadow MMU as well
 
 * Enable CMCI capability by default and handle injected UCNA errors
 
 * Expose pid of vcpu threads in debugfs
 
 * x2AVIC support for AMD
 
 * cleanup PIO emulation
 
 * Fixes for LLDT/LTR emulation
 
 * Don't require refcounted "struct page" to create huge SPTEs
 
 * Miscellaneous cleanups:
 ** MCE MSR emulation
 ** Use separate namespaces for guest PTEs and shadow PTEs bitmasks
 ** PIO emulation
 ** Reorganize rmap API, mostly around rmap destruction
 ** Do not workaround very old KVM bugs for L0 that runs with nesting enabled
 ** new selftests API for CPUID
 
 Generic:
 
 * Fix races in gfn->pfn cache refresh; do not pin pages tracked by the cache
 
 * new selftests API using struct kvm_vcpu instead of a (vm, id) tuple
 -----BEGIN PGP SIGNATURE-----
 
 iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmLnyo4UHHBib256aW5p
 QHJlZGhhdC5jb20ACgkQv/vSX3jHroMtQQf/XjVWiRcWLPR9dqzRM/vvRXpiG+UL
 jU93R7m6ma99aqTtrxV/AE+kHgamBlma3Cwo+AcWk9uCVNbIhFjv2YKg6HptKU0e
 oJT3zRYp+XIjEo7Kfw+TwroZbTlG6gN83l1oBLFMqiFmHsMLnXSI2mm8MXyi3dNB
 vR2uIcTAl58KIprqNNsYJ2dNn74ogOMiXYx9XzoA9/5Xb6c0h4rreHJa5t+0s9RO
 Gz7Io3PxumgsbJngjyL1Ve5oxhlIAcZA8DU0PQmjxo3eS+k6BcmavGFd45gNL5zg
 iLpCh4k86spmzh8CWkAAwWPQE4dZknK6jTctJc0OFVad3Z7+X7n0E8TFrA==
 =PM8o
 -----END PGP SIGNATURE-----

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm updates from Paolo Bonzini:
 "Quite a large pull request due to a selftest API overhaul and some
  patches that had come in too late for 5.19.

  ARM:

   - Unwinder implementations for both nVHE modes (classic and
     protected), complete with an overflow stack

   - Rework of the sysreg access from userspace, with a complete rewrite
     of the vgic-v3 view to allign with the rest of the infrastructure

   - Disagregation of the vcpu flags in separate sets to better track
     their use model.

   - A fix for the GICv2-on-v3 selftest

   - A small set of cosmetic fixes

  RISC-V:

   - Track ISA extensions used by Guest using bitmap

   - Added system instruction emulation framework

   - Added CSR emulation framework

   - Added gfp_custom flag in struct kvm_mmu_memory_cache

   - Added G-stage ioremap() and iounmap() functions

   - Added support for Svpbmt inside Guest

  s390:

   - add an interface to provide a hypervisor dump for secure guests

   - improve selftests to use TAP interface

   - enable interpretive execution of zPCI instructions (for PCI
     passthrough)

   - First part of deferred teardown

   - CPU Topology

   - PV attestation

   - Minor fixes

  x86:

   - Permit guests to ignore single-bit ECC errors

   - Intel IPI virtualization

   - Allow getting/setting pending triple fault with
     KVM_GET/SET_VCPU_EVENTS

   - PEBS virtualization

   - Simplify PMU emulation by just using PERF_TYPE_RAW events

   - More accurate event reinjection on SVM (avoid retrying
     instructions)

   - Allow getting/setting the state of the speaker port data bit

   - Refuse starting the kvm-intel module if VM-Entry/VM-Exit controls
     are inconsistent

   - "Notify" VM exit (detect microarchitectural hangs) for Intel

   - Use try_cmpxchg64 instead of cmpxchg64

   - Ignore benign host accesses to PMU MSRs when PMU is disabled

   - Allow disabling KVM's "MONITOR/MWAIT are NOPs!" behavior

   - Allow NX huge page mitigation to be disabled on a per-vm basis

   - Port eager page splitting to shadow MMU as well

   - Enable CMCI capability by default and handle injected UCNA errors

   - Expose pid of vcpu threads in debugfs

   - x2AVIC support for AMD

   - cleanup PIO emulation

   - Fixes for LLDT/LTR emulation

   - Don't require refcounted "struct page" to create huge SPTEs

   - Miscellaneous cleanups:
      - MCE MSR emulation
      - Use separate namespaces for guest PTEs and shadow PTEs bitmasks
      - PIO emulation
      - Reorganize rmap API, mostly around rmap destruction
      - Do not workaround very old KVM bugs for L0 that runs with nesting enabled
      - new selftests API for CPUID

  Generic:

   - Fix races in gfn->pfn cache refresh; do not pin pages tracked by
     the cache

   - new selftests API using struct kvm_vcpu instead of a (vm, id)
     tuple"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (606 commits)
  selftests: kvm: set rax before vmcall
  selftests: KVM: Add exponent check for boolean stats
  selftests: KVM: Provide descriptive assertions in kvm_binary_stats_test
  selftests: KVM: Check stat name before other fields
  KVM: x86/mmu: remove unused variable
  RISC-V: KVM: Add support for Svpbmt inside Guest/VM
  RISC-V: KVM: Use PAGE_KERNEL_IO in kvm_riscv_gstage_ioremap()
  RISC-V: KVM: Add G-stage ioremap() and iounmap() functions
  KVM: Add gfp_custom flag in struct kvm_mmu_memory_cache
  RISC-V: KVM: Add extensible CSR emulation framework
  RISC-V: KVM: Add extensible system instruction emulation framework
  RISC-V: KVM: Factor-out instruction emulation into separate sources
  RISC-V: KVM: move preempt_disable() call in kvm_arch_vcpu_ioctl_run
  RISC-V: KVM: Make kvm_riscv_guest_timer_init a void function
  RISC-V: KVM: Fix variable spelling mistake
  RISC-V: KVM: Improve ISA extension by using a bitmap
  KVM, x86/mmu: Fix the comment around kvm_tdp_mmu_zap_leafs()
  KVM: SVM: Dump Virtual Machine Save Area (VMSA) to klog
  KVM: x86/mmu: Treat NX as a valid SPTE bit for NPT
  KVM: x86: Do not block APIC write for non ICR registers
  ...
2022-08-04 14:59:54 -07:00
Linus Torvalds
aad26f55f4 This was a moderately busy cycle for documentation, but nothing all that
earth-shaking:
 
 - More Chinese translations, and an update to the Italian translations.
   The Japanese, Korean, and traditional Chinese translations are
   more-or-less unmaintained at this point, instead.
 
 - Some build-system performance improvements.
 
 - The removal of the archaic submitting-drivers.rst document, with the
   movement of what useful material that remained into other docs.
 
 - Improvements to sphinx-pre-install to, hopefully, give more useful
   suggestions.
 
 - A number of build-warning fixes
 
 Plus the usual collection of typo fixes, updates, and more.
 -----BEGIN PGP SIGNATURE-----
 
 iQFDBAABCAAtFiEEIw+MvkEiF49krdp9F0NaE2wMflgFAmLn9OwPHGNvcmJldEBs
 d24ubmV0AAoJEBdDWhNsDH5YtrwIAJNZoDYJJIRuVHnFkAn5EJ4b/chnR1dSTBtn
 WdE/1zdAlMBWVlEGO48VZybph9Sk0v+cUGf+yviDgASQrfOhRRTkg/0u6XaBAYO0
 +C2D1QDd9DggGgajxsfJfTdD3IuB78mGmCQvP17XIJW+NK1CK9rXZBnj6WC5/HJw
 PCHzeeVreBxOS3W9GelMYa6vjVl7dv81x4DPllnsgU2AMk0/Ce0MVjeIZ695sOeP
 Ki6jZgC2GsgFSK5kBC35OiDe5q+fDzlLfek34EUCn4SIbMALSUYWO1db122w5Pme
 Ej0+UTBhD19WH1uB/rcVKnVWugi7UEUJexZsao+nC7UrdIVtYq0=
 =83BG
 -----END PGP SIGNATURE-----

Merge tag 'docs-6.0' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "This was a moderately busy cycle for documentation, but nothing
  all that earth-shaking:

   - More Chinese translations, and an update to the Italian
     translations.

     The Japanese, Korean, and traditional Chinese translations
     are more-or-less unmaintained at this point, instead.

   - Some build-system performance improvements.

   - The removal of the archaic submitting-drivers.rst document,
     with the movement of what useful material that remained into
     other docs.

   - Improvements to sphinx-pre-install to, hopefully, give more
     useful suggestions.

   - A number of build-warning fixes

  Plus the usual collection of typo fixes, updates, and more"

* tag 'docs-6.0' of git://git.lwn.net/linux: (92 commits)
  docs: efi-stub: Fix paths for x86 / arm stubs
  Docs/zh_CN: Update the translation of sched-stats to 5.19-rc8
  Docs/zh_CN: Update the translation of pci to 5.19-rc8
  Docs/zh_CN: Update the translation of pci-iov-howto to 5.19-rc8
  Docs/zh_CN: Update the translation of usage to 5.19-rc8
  Docs/zh_CN: Update the translation of testing-overview to 5.19-rc8
  Docs/zh_CN: Update the translation of sparse to 5.19-rc8
  Docs/zh_CN: Update the translation of kasan to 5.19-rc8
  Docs/zh_CN: Update the translation of iio_configfs to 5.19-rc8
  doc:it_IT: align Italian documentation
  docs: Remove spurious tag from admin-guide/mm/overcommit-accounting.rst
  Documentation: process: Update email client instructions for Thunderbird
  docs: ABI: correct QEMU fw_cfg spec path
  doc/zh_CN: remove submitting-driver reference from docs
  docs: zh_TW: align to submitting-drivers removal
  docs: zh_CN: align to submitting-drivers removal
  docs: ko_KR: howto: remove reference to removed submitting-drivers
  docs: ja_JP: howto: remove reference to removed submitting-drivers
  docs: it_IT: align to submitting-drivers removal
  docs: process: remove outdated submitting-drivers.rst
  ...
2022-08-02 19:24:24 -07:00
Linus Torvalds
0cec3f24a7 arm64 updates for 5.20
- Remove unused generic cpuidle support (replaced by PSCI version)
 
 - Fix documentation describing the kernel virtual address space
 
 - Handling of some new CPU errata in Arm implementations
 
 - Rework of our exception table code in preparation for handling
   machine checks (i.e. RAS errors) more gracefully
 
 - Switch over to the generic implementation of ioremap()
 
 - Fix lockdep tracking in NMI context
 
 - Instrument our memory barrier macros for KCSAN
 
 - Rework of the kPTI G->nG page-table repainting so that the MMU remains
   enabled and the boot time is no longer slowed to a crawl for systems
   which require the late remapping
 
 - Enable support for direct swapping of 2MiB transparent huge-pages on
   systems without MTE
 
 - Fix handling of MTE tags with allocating new pages with HW KASAN
 
 - Expose the SMIDR register to userspace via sysfs
 
 - Continued rework of the stack unwinder, particularly improving the
   behaviour under KASAN
 
 - More repainting of our system register definitions to match the
   architectural terminology
 
 - Improvements to the layout of the vDSO objects
 
 - Support for allocating additional bits of HWCAP2 and exposing
   FEAT_EBF16 to userspace on CPUs that support it
 
 - Considerable rework and optimisation of our early boot code to reduce
   the need for cache maintenance and avoid jumping in and out of the
   kernel when handling relocation under KASLR
 
 - Support for disabling SVE and SME support on the kernel command-line
 
 - Support for the Hisilicon HNS3 PMU
 
 - Miscellanous cleanups, trivial updates and minor fixes
 -----BEGIN PGP SIGNATURE-----
 
 iQFEBAABCgAuFiEEPxTL6PPUbjXGY88ct6xw3ITBYzQFAmLeccUQHHdpbGxAa2Vy
 bmVsLm9yZwAKCRC3rHDchMFjNCysB/4ml92RJLhVwRAofbtFfVgVz3JLTSsvob9x
 Z7FhNDxfM/G32wKtOHU9tHkGJ+PMVWOPajukzxkMhxmilfTyHBbiisNWVRjKQxj4
 wrd07DNXPIv3bi8SWzS1y2y8ZqujZWjNJlX8SUCzEoxCVtuNKwrh96kU1jUjrkFZ
 kBo4E4wBWK/qW29nClGSCgIHRQNJaB/jvITlQhkqIb0pwNf3sAUzW7QoF1iTZWhs
 UswcLh/zC4q79k9poegdCt8chV5OBDLtLPnMxkyQFvsLYRp3qhyCSQQY/BxvO5JS
 jT9QR6d+1ewET9BFhqHlIIuOTYBCk3xn/PR9AucUl+ZBQd2tO4B1
 =LVH0
 -----END PGP SIGNATURE-----

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 updates from Will Deacon:
 "Highlights include a major rework of our kPTI page-table rewriting
  code (which makes it both more maintainable and considerably faster in
  the cases where it is required) as well as significant changes to our
  early boot code to reduce the need for data cache maintenance and
  greatly simplify the KASLR relocation dance.

  Summary:

   - Remove unused generic cpuidle support (replaced by PSCI version)

   - Fix documentation describing the kernel virtual address space

   - Handling of some new CPU errata in Arm implementations

   - Rework of our exception table code in preparation for handling
     machine checks (i.e. RAS errors) more gracefully

   - Switch over to the generic implementation of ioremap()

   - Fix lockdep tracking in NMI context

   - Instrument our memory barrier macros for KCSAN

   - Rework of the kPTI G->nG page-table repainting so that the MMU
     remains enabled and the boot time is no longer slowed to a crawl
     for systems which require the late remapping

   - Enable support for direct swapping of 2MiB transparent huge-pages
     on systems without MTE

   - Fix handling of MTE tags with allocating new pages with HW KASAN

   - Expose the SMIDR register to userspace via sysfs

   - Continued rework of the stack unwinder, particularly improving the
     behaviour under KASAN

   - More repainting of our system register definitions to match the
     architectural terminology

   - Improvements to the layout of the vDSO objects

   - Support for allocating additional bits of HWCAP2 and exposing
     FEAT_EBF16 to userspace on CPUs that support it

   - Considerable rework and optimisation of our early boot code to
     reduce the need for cache maintenance and avoid jumping in and out
     of the kernel when handling relocation under KASLR

   - Support for disabling SVE and SME support on the kernel
     command-line

   - Support for the Hisilicon HNS3 PMU

   - Miscellanous cleanups, trivial updates and minor fixes"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (136 commits)
  arm64: Delay initialisation of cpuinfo_arm64::reg_{zcr,smcr}
  arm64: fix KASAN_INLINE
  arm64/hwcap: Support FEAT_EBF16
  arm64/cpufeature: Store elf_hwcaps as a bitmap rather than unsigned long
  arm64/hwcap: Document allocation of upper bits of AT_HWCAP
  arm64: enable THP_SWAP for arm64
  arm64/mm: use GENMASK_ULL for TTBR_BADDR_MASK_52
  arm64: errata: Remove AES hwcap for COMPAT tasks
  arm64: numa: Don't check node against MAX_NUMNODES
  drivers/perf: arm_spe: Fix consistency of SYS_PMSCR_EL1.CX
  perf: RISC-V: Add of_node_put() when breaking out of for_each_of_cpu_node()
  docs: perf: Include hns3-pmu.rst in toctree to fix 'htmldocs' WARNING
  arm64: kasan: Revert "arm64: mte: reset the page tag in page->flags"
  mm: kasan: Skip page unpoisoning only if __GFP_SKIP_KASAN_UNPOISON
  mm: kasan: Skip unpoisoning of user pages
  mm: kasan: Ensure the tags are visible before the tag in page->flags
  drivers/perf: hisi: add driver for HNS3 PMU
  drivers/perf: hisi: Add description for HNS3 PMU driver
  drivers/perf: riscv_pmu_sbi: perf format
  perf/arm-cci: Use the bitmap API to allocate bitmaps
  ...
2022-08-01 10:37:00 -07:00
Paolo Bonzini
63f4b21041 Merge remote-tracking branch 'kvm/next' into kvm-next-5.20
KVM/s390, KVM/x86 and common infrastructure changes for 5.20

x86:

* Permit guests to ignore single-bit ECC errors

* Fix races in gfn->pfn cache refresh; do not pin pages tracked by the cache

* Intel IPI virtualization

* Allow getting/setting pending triple fault with KVM_GET/SET_VCPU_EVENTS

* PEBS virtualization

* Simplify PMU emulation by just using PERF_TYPE_RAW events

* More accurate event reinjection on SVM (avoid retrying instructions)

* Allow getting/setting the state of the speaker port data bit

* Refuse starting the kvm-intel module if VM-Entry/VM-Exit controls are inconsistent

* "Notify" VM exit (detect microarchitectural hangs) for Intel

* Cleanups for MCE MSR emulation

s390:

* add an interface to provide a hypervisor dump for secure guests

* improve selftests to use TAP interface

* enable interpretive execution of zPCI instructions (for PCI passthrough)

* First part of deferred teardown

* CPU Topology

* PV attestation

* Minor fixes

Generic:

* new selftests API using struct kvm_vcpu instead of a (vm, id) tuple

x86:

* Use try_cmpxchg64 instead of cmpxchg64

* Bugfixes

* Ignore benign host accesses to PMU MSRs when PMU is disabled

* Allow disabling KVM's "MONITOR/MWAIT are NOPs!" behavior

* x86/MMU: Allow NX huge pages to be disabled on a per-vm basis

* Port eager page splitting to shadow MMU as well

* Enable CMCI capability by default and handle injected UCNA errors

* Expose pid of vcpu threads in debugfs

* x2AVIC support for AMD

* cleanup PIO emulation

* Fixes for LLDT/LTR emulation

* Don't require refcounted "struct page" to create huge SPTEs

x86 cleanups:

* Use separate namespaces for guest PTEs and shadow PTEs bitmasks

* PIO emulation

* Reorganize rmap API, mostly around rmap destruction

* Do not workaround very old KVM bugs for L0 that runs with nesting enabled

* new selftests API for CPUID
2022-08-01 03:21:00 -04:00
Paolo Bonzini
a4850b5590 KVM: s390x: Fixes and features for 5.20
* First part of deferred teardown
 * CPU Topology
 * interpretive execution for PCI instructions
 * PV attestation
 * Minor fixes
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEEoWuZBM6M3lCBSfTnuARItAMU6BMFAmLZaj0ACgkQuARItAMU
 6BPmPw/+PIZ7xxoiuUCCWlFi+RsfgTH1OWGoLL2B8zQHyJJ+IS4puGqKfVdusl56
 GhPPlTkBG9gbhRXUMDWnKgp4JLOIj8ngbgQ8zcD/xeH8tzm4iRy+uj7PxCe+kQGB
 CY3rL42HwEvFJUbLzi0/8ahLjz6t7+hq7okMdhq9/MoIJBp/w74QZb+chpbuCpi/
 /nwdfon85NYTLCK73g6kjjHzzA3hQfUmheVkOt288Qp3yKLh77blJ79SRl3xHeuH
 PBTqsLoxMiJyFfhJQ9U5HnKcIMAD6vA4ayoj1PAZgToYt40B3k8K6HQF+07TcZuy
 KABAqmUMNgbapUC74+U45d1eLAl1TGbZSuaq5ymb9jyFyMxGN2Vp6K9O6Ebd+ghy
 NsGc+CLRPDTiwi/D+QQpGrIksqcMEy+ocGGjbeIuRQxao6C9+KladP5nRxXJpDZf
 Vrupw+gDjBPozmQAA50VtR+ad5rdEdbSmUvo0nIeBpQ4VJxLFnA0tXl4XOEEFr2M
 214yv691KFXhVtaV0lHRKoCQ78OAix6XyjHI0rukGnqNNo7w+V3htU0oG0ifWEU9
 96BpKKpjfsCRhN1h2BF8MTPMEb6AGsI2hLCm3neGxrcT7KM1chk2Z3qlGdrc3xZT
 BIj7H23trC6HG0vCi1rHAn+S0zmcnt5TCaRUNQF5nUeLYfV1FC0=
 =IB9Y
 -----END PGP SIGNATURE-----

Merge tag 'kvm-s390-next-5.20-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

KVM: s390x: Fixes and features for 5.20

* First part of deferred teardown
* CPU Topology
* interpretive execution for PCI instructions
* PV attestation
* Minor fixes
2022-07-22 03:14:32 -04:00
Pierre Morel
f5ecfee944 KVM: s390: resetting the Topology-Change-Report
During a subsystem reset the Topology-Change-Report is cleared.

Let's give userland the possibility to clear the MTCR in the case
of a subsystem reset.

To migrate the MTCR, we give userland the possibility to
query the MTCR state.

We indicate KVM support for the CPU topology facility with a new
KVM capability: KVM_CAP_S390_CPU_TOPOLOGY.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20220714194334.127812-1-pmorel@linux.ibm.com>
Link: https://lore.kernel.org/all/20220714194334.127812-1-pmorel@linux.ibm.com/
[frankja@linux.ibm.com: Simple conflict resolution in Documentation/virt/kvm/api.rst]
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
2022-07-20 10:57:37 +02:00
Oliver Upton
450a563924 KVM: stats: Fix value for KVM_STATS_UNIT_MAX for boolean stats
commit 1b870fa557 ("kvm: stats: tell userspace which values are
boolean") added a new stat unit (boolean) but failed to raise
KVM_STATS_UNIT_MAX.

Fix by pointing UNIT_MAX at the new max value of UNIT_BOOLEAN.

Fixes: 1b870fa557 ("kvm: stats: tell userspace which values are boolean")
Reported-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Signed-off-by: Oliver Upton <oupton@google.com>
Message-Id: <20220719125229.2934273-1-oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-07-19 08:54:11 -04:00
Paolo Bonzini
942d9e8952 Documentation: kvm: clarify histogram units
In the case of histogram statistics, the values are always sample
counts; the unit instead applies to the bucket range.  For example,
halt_poll_success_hist is a nanosecond statistic because the buckets are
for 0ns, 1ns, 2-3ns, 4-7ns etc.  There isn't really any other sensible
interpretation, but clarify this anyway in the Documentation.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-07-14 08:02:09 -04:00
Paolo Bonzini
1b870fa557 kvm: stats: tell userspace which values are boolean
Some of the statistics values exported by KVM are always only 0 or 1.
It can be useful to export this fact to userspace so that it can track
them specially (for example by polling the value every now and then to
compute a % of time spent in a specific state).

Therefore, add "boolean value" as a new "unit".  While it is not exactly
a unit, it walks and quacks like one.  In particular, using the type
would be wrong because boolean values could be instantaneous or peak
values (e.g. "is the rmap allocated?") or even two-bucket histograms
(e.g. "number of posted vs. non-posted interrupt injections").

Suggested-by: Amneesh Singh <natto@weirdnatto.in>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-07-14 08:01:59 -04:00
Sean Christopherson
43bb9e000e KVM: x86: Tweak name of MONITOR/MWAIT #UD quirk to make it #UD specific
Add a "UD" clause to KVM_X86_QUIRK_MWAIT_NEVER_FAULTS to make it clear
that the quirk only controls the #UD behavior of MONITOR/MWAIT.  KVM
doesn't currently enforce fault checks when MONITOR/MWAIT are supported,
but that could change in the future.  SVM also has a virtualization hole
in that it checks all faults before intercepts, and so "never faults" is
already a lie when running on SVM.

Fixes: bfbcc81bb8 ("KVM: x86: Add a quirk for KVM's "MONITOR/MWAIT are NOPs!" behavior")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220711225753.1073989-4-seanjc@google.com
2022-07-13 18:14:05 -07:00
Michael Kelley
ab3e69fc4d Documentation: hyperv: Add overview of clocks and timers
Add documentation topic for clocks and timers when running as a
guest on Hyper-V.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1657561704-12631-4-git-send-email-mikelley@microsoft.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-07-13 14:04:48 -06:00
Michael Kelley
ac1129e79e Documentation: hyperv: Add overview of VMbus
Add documentation topic for using VMbus when running as a guest
on Hyper-V.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1657561704-12631-3-git-send-email-mikelley@microsoft.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-07-13 14:04:48 -06:00
Michael Kelley
ec7c56812f Documentation: hyperv: Add overview of Hyper-V enlightenments
Add an initial documentation topic for Linux enlightenments to
run as a guest on Microsoft's Hyper-V hypervisor, linked under
the "virt" documentation area. Update the virt doc index.rst
and the MAINTAINERS file.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1657561704-12631-2-git-send-email-mikelley@microsoft.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-07-13 14:04:48 -06:00
Bagas Sanjaya
5efab5cdf0 Documentation: kvm: extend KVM_S390_ZPCI_OP subheading underline
Stephen Rothwell reported the htmldocs warning:

Documentation/virt/kvm/api.rst:5959: WARNING: Title underline too short.

4.137 KVM_S390_ZPCI_OP
--------------------

The warning is due to subheading underline on KVM_S390_ZPCI_OP section is
short of 2 dashes.

Extend the underline to fix the warning.

Link: https://lore.kernel.org/linux-next/20220711205557.183c3b14@canb.auug.org.au/
Fixes: a0c4d1109d6cc5 ("KVM: s390: add KVM_S390_ZPCI_OP to manage guest zPCI devices")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Pierre Morel <pmorel@linux.ibm.com>
Cc: Thomas Huth <thuth@redhat.com>
Cc: Matthew Rosato <mjrosato@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://lore.kernel.org/r/20220712092954.142027-4-bagasdotme@gmail.com
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
2022-07-13 10:10:11 +02:00
Christian Borntraeger
d41b5e0176 KVM: s390/pci: enable zPCI for interpretive execution
Add the necessary code in s390 base, pci and KVM to enable interpretion
 of PCI pasthru.
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEE+SKTgaM0CPnbq/vKEXu8gLWmHHwFAmLL7HcACgkQEXu8gLWm
 HHz0JA/8C/pG5JdeOfKA6ZgWuUtxh8NRAmn+XEh+sAPpdK1cmEc1Qt/UKteSFel4
 cmqfaCELalq/BaFxtPS7Wn8Rf4pY8/GwEzwM0dNiS09pTWv0YMXql6+013nr1TJU
 hWx5Pm9Za+T/UnbbHqlyJfjMf7/HELHmQYemDpCr6n1sIYMjsWIJI/P6ZsQiG/8V
 iDZQGIM8mfUC+PMzxsYAQZQB3nm6noZfnWlAcuChDCmgk2ZxdXSdZlHneiLLiYlb
 yZPOyTysA0H2iFgRGfXMI4Oz6vegr6xAcZ2c9mkc8lM42yKHQNpPa0PqEY+EzVV8
 0iaMT3LKWQRdjzTq6E4I5wb74KQn/t1TbTzM5wznOQ6GySRhPvnXVLOuYyUf5d+0
 PwtnfKyx2C5UtOn47Xuujp5FClP8NI8Se5uq6Myei5OtYAvrQtOFxiJAixLx8nCb
 ca/migenYr+R5zYn5g3o6oo2BUJfF3Y1Q8nazz602JRu42aZzVFu2GNB062YjleK
 w7SfIZNTh0picxSmoehSOQMVaiGY/C/ow7Xa+bLaCITQC3s8HY73m3gynaVOB23X
 2umrC3HkTnH2ymqvDC6O/5QG7IUlSfjbWzN0TdmPfV5KeM7BmBvP4vxqxRYyTY7b
 7UhFg820fZKZu4Ul740a2+HBNw73T8fc4xbZVJ6glJo3AdWQD5s=
 =YD+W
 -----END PGP SIGNATURE-----

Merge tag 'kvm-s390-pci-5.20' into kernelorgnext

KVM: s390/pci: enable zPCI for interpretive execution

Add the necessary code in s390 base, pci and KVM to enable interpretion
of PCI pasthru.
2022-07-11 11:28:57 +02:00
Matthew Rosato
db1c875e05 KVM: s390: add KVM_S390_ZPCI_OP to manage guest zPCI devices
The KVM_S390_ZPCI_OP ioctl provides a mechanism for managing
hardware-assisted virtualization features for s390x zPCI passthrough.
Add the first 2 operations, which can be used to enable/disable
the specified device for Adapter Event Notification interpretation.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20220606203325.110625-21-mjrosato@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
2022-07-11 09:54:38 +02:00
Mauro Carvalho Chehab
8a5d192166 Documentation: KVM: update s390-diag.rst reference
Changeset daec8d4083 ("Documentation: KVM: add separate directories for architecture-specific documentation")
renamed: Documentation/virt/kvm/s390-diag.rst
to: Documentation/virt/kvm/s390/s390-diag.rst.

Update its cross-reference accordingly.

Fixes: daec8d4083 ("Documentation: KVM: add separate directories for architecture-specific documentation")
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/85b81e4678bbe23d0e9692616798762a6465f0a3.1656234456.git.mchehab@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-07-07 13:10:00 -06:00
Mauro Carvalho Chehab
48b36e59ac Documentation: KVM: update msr.rst reference
Changeset daec8d4083 ("Documentation: KVM: add separate directories for architecture-specific documentation")
renamed: Documentation/virt/kvm/msr.rst
to: Documentation/virt/kvm/x86/msr.rst.

Update its cross-reference accordingly.

Fixes: daec8d4083 ("Documentation: KVM: add separate directories for architecture-specific documentation")
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/5652b7f5caff3b817a660b75f1f319a2f8962380.1656234456.git.mchehab@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-07-07 13:09:59 -06:00
Mauro Carvalho Chehab
7ac3945d8e Documentation: KVM: update amd-memory-encryption.rst references
Changeset daec8d4083 ("Documentation: KVM: add separate directories for architecture-specific documentation")
renamed: Documentation/virt/kvm/amd-memory-encryption.rst
to: Documentation/virt/kvm/x86/amd-memory-encryption.rst.

Update the cross-references accordingly.

Fixes: daec8d4083 ("Documentation: KVM: add separate directories for architecture-specific documentation")
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/fd80db889e34aae87a4ca88cad94f650723668f4.1656234456.git.mchehab@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-07-07 13:09:59 -06:00
Mauro Carvalho Chehab
e38fd63749 Documentation: KVM: update s390-pv.rst reference
Changesets: daec8d4083 ("Documentation: KVM: add separate directories for architecture-specific documentation")
and: daec8d4083 ("Documentation: KVM: add separate directories for architecture-specific documentation")
renamed: Documentation/virt/kvm/s390-pv.rst
to: Documentation/virt/kvm/s390/s390-pv.rst.

Update its cross-reference accordingly.

Fixes: daec8d4083 ("Documentation: KVM: add separate directories for architecture-specific documentation")
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/e2676f087d287db0bc31ae7c05c80ce5adf93333.1656234456.git.mchehab@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-07-07 13:09:59 -06:00
Marc Zyngier
7ddb0c3df7 arm64: Rename the VHE switch to "finalise_el2"
as we are about to perform a lot more in 'mutate_to_vhe' than
we currently do, this function really becomes the point where
we finalise the basic EL2 configuration.

Reflect this into the code by renaming a bunch of things:
- HVC_VHE_RESTART -> HVC_FINALISE_EL2
- switch_to_vhe --> finalise_el2
- mutate_to_vhe -> __finalise_el2

No functional changes.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220630160500.1536744-2-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
2022-07-01 15:22:51 +01:00
Steven Lung
5b8d9ee003 docs: UML: fix typo
Replace 'absense' with 'absence'.

Signed-off-by: Steven Lung <1030steven@gmail.com>
Link: https://lore.kernel.org/r/20220621072910.4704-1-1030steven@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-06-24 13:18:21 -06:00
Ben Gardon
084cc29f8b KVM: x86/MMU: Allow NX huge pages to be disabled on a per-vm basis
In some cases, the NX hugepage mitigation for iTLB multihit is not
needed for all guests on a host. Allow disabling the mitigation on a
per-VM basis to avoid the performance hit of NX hugepages on trusted
workloads.

In order to disable NX hugepages on a VM, ensure that the userspace
actor has permission to reboot the system. Since disabling NX hugepages
would allow a guest to crash the system, it is similar to reboot
permissions.

Ideally, KVM would require userspace to prove it has access to KVM's
nx_huge_pages module param, e.g. so that userspace can opt out without
needing full reboot permissions.  But getting access to the module param
file info is difficult because it is buried in layers of sysfs and module
glue. Requiring CAP_SYS_BOOT is sufficient for all known use cases.

Suggested-by: Jim Mattson <jmattson@google.com>
Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20220613212523.3436117-9-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-24 04:51:49 -04:00
Sean Christopherson
bfbcc81bb8 KVM: x86: Add a quirk for KVM's "MONITOR/MWAIT are NOPs!" behavior
Add a quirk for KVM's behavior of emulating intercepted MONITOR/MWAIT
instructions a NOPs regardless of whether or not they are supported in
guest CPUID.  KVM's current behavior was likely motiviated by a certain
fruity operating system that expects MONITOR/MWAIT to be supported
unconditionally and blindly executes MONITOR/MWAIT without first checking
CPUID.  And because KVM does NOT advertise MONITOR/MWAIT to userspace,
that's effectively the default setup for any VMM that regurgitates
KVM_GET_SUPPORTED_CPUID to KVM_SET_CPUID2.

Note, this quirk interacts with KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT.  The
behavior is actually desirable, as userspace VMMs that want to
unconditionally hide MONITOR/MWAIT from the guest can leave the
MISC_ENABLE quirk enabled.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220608224516.3788274-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-20 11:50:42 -04:00
Sean Christopherson
8deb03e75f KVM: Fix references to non-existent KVM_CAP_TRIPLE_FAULT_EVENT
The x86-only KVM_CAP_TRIPLE_FAULT_EVENT was (appropriately) renamed to
KVM_CAP_X86_TRIPLE_FAULT_EVENT when the patches were applied, but the
docs and selftests got left behind.  Fix them.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-11 10:14:28 -04:00
Paul Durrant
b172862241 KVM: x86: PIT: Preserve state of speaker port data bit
Currently the state of the speaker port (0x61) data bit (bit 1) is not
saved in the exported state (kvm_pit_state2) and hence is lost when
re-constructing guest state.

This patch removes the 'speaker_data_port' field from kvm_kpit_state and
instead tracks the state using a new KVM_PIT_FLAGS_SPEAKER_DATA_ON flag
defined in the API.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Message-Id: <20220531124421.1427-1-pdurrant@amazon.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-08 13:06:20 -04:00
Tao Xu
2f4073e08f KVM: VMX: Enable Notify VM exit
There are cases that malicious virtual machines can cause CPU stuck (due
to event windows don't open up), e.g., infinite loop in microcode when
nested #AC (CVE-2015-5307). No event window means no event (NMI, SMI and
IRQ) can be delivered. It leads the CPU to be unavailable to host or
other VMs.

VMM can enable notify VM exit that a VM exit generated if no event
window occurs in VM non-root mode for a specified amount of time (notify
window).

Feature enabling:
- The new vmcs field SECONDARY_EXEC_NOTIFY_VM_EXITING is introduced to
  enable this feature. VMM can set NOTIFY_WINDOW vmcs field to adjust
  the expected notify window.
- Add a new KVM capability KVM_CAP_X86_NOTIFY_VMEXIT so that user space
  can query and enable this feature in per-VM scope. The argument is a
  64bit value: bits 63:32 are used for notify window, and bits 31:0 are
  for flags. Current supported flags:
  - KVM_X86_NOTIFY_VMEXIT_ENABLED: enable the feature with the notify
    window provided.
  - KVM_X86_NOTIFY_VMEXIT_USER: exit to userspace once the exits happen.
- It's safe to even set notify window to zero since an internal hardware
  threshold is added to vmcs.notify_window.

VM exit handling:
- Introduce a vcpu state notify_window_exits to records the count of
  notify VM exits and expose it through the debugfs.
- Notify VM exit can happen incident to delivery of a vector event.
  Allow it in KVM.
- Exit to userspace unconditionally for handling when VM_CONTEXT_INVALID
  bit is set.

Nested handling
- Nested notify VM exits are not supported yet. Keep the same notify
  window control in vmcs02 as vmcs01, so that L1 can't escape the
  restriction of notify VM exits through launching L2 VM.

Notify VM exit is defined in latest Intel Architecture Instruction Set
Extensions Programming Reference, chapter 9.2.

Co-developed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Tao Xu <tao3.xu@intel.com>
Co-developed-by: Chenyi Qiang <chenyi.qiang@intel.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Message-Id: <20220524135624.22988-5-chenyi.qiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-08 05:56:24 -04:00
Chenyi Qiang
ed2351174e KVM: x86: Extend KVM_{G,S}ET_VCPU_EVENTS to support pending triple fault
For the triple fault sythesized by KVM, e.g. the RSM path or
nested_vmx_abort(), if KVM exits to userspace before the request is
serviced, userspace could migrate the VM and lose the triple fault.

Extend KVM_{G,S}ET_VCPU_EVENTS to support pending triple fault with a
new event KVM_VCPUEVENT_VALID_FAULT_FAULT so that userspace can save and
restore the triple fault event. This extension is guarded by a new KVM
capability KVM_CAP_TRIPLE_FAULT_EVENT.

Note that in the set_vcpu_events path, userspace is able to set/clear
the triple fault request through triple_fault.pending field.

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Message-Id: <20220524135624.22988-2-chenyi.qiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-08 05:20:53 -04:00
Zeng Guang
3587531638 KVM: x86: Allow userspace to set maximum VCPU id for VM
Introduce new max_vcpu_ids in KVM for x86 architecture. Userspace
can assign maximum possible vcpu id for current VM session using
KVM_CAP_MAX_VCPU_ID of KVM_ENABLE_CAP ioctl().

This is done for x86 only because the sole use case is to guide
memory allocation for PID-pointer table, a structure needed to
enable VMX IPI.

By default, max_vcpu_ids set as KVM_MAX_VCPU_IDS.

Suggested-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Zeng Guang <guang.zeng@intel.com>
Message-Id: <20220419154444.11888-1-guang.zeng@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-08 04:47:31 -04:00
Paolo Bonzini
5552de7b92 KVM: s390: pvdump and selftest improvements
- add an interface to provide a hypervisor dump for secure guests
 - improve selftests to show tests
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEE+SKTgaM0CPnbq/vKEXu8gLWmHHwFAmKXf2wACgkQEXu8gLWm
 HHzu1Q//WjEuOX5nBjklMUlDB2oB2+vFSyW9lE7x9m38EnFTH8QTfH695ChVoNN+
 j06Fhd4ENjxqTTYs7z67tP4TSQ/LhB/GsPydKCEOnB/63+k2cnYeS3wsv19213F0
 IyvpN6MkzxoktV4m1EtKhlvXGpEBoXZCczgBLj3FYlNQ7kO8RsSkF9rOnhuP9Yjh
 l2876bWHWlbU0qWmRSAu0spkwHWjtyh/bnQKzXotQyrQ9bo1yMQvhe2HH8HVTSio
 cjRlseWVi01rJKzKcs6D7MFMctLKr5y0onxBgGJnRh27KoBY195ICH2Jz2LfJoor
 EP57YcXZqfxzKCGHTGgVYMgFeixX6nzBgqTpDIHMQzvoM1IrQKl+d5riepO03xpS
 gZxHtJqZi8s+t8w0ZFBHj83VXkzFyLuCIeui9vo3cQ00K7bBrNUSw1BAdqT5HTzW
 K2R4jSQaszjw8mDz3R3G1+yg6PjMS6cDEU1+G2Id7xSYTV3lJnBDVzas7aEUNCC4
 LzIrD5c4dscyZzIjAp9huVwpZoCNLy6jtecRTaGhA2YiE0VMWtJlMJHwbShlSnM7
 5VhEn859namvoYtN8XBaTFa/jRDOxO+LHWuOy172oaBUgaVHBjZQLyrlit1FRQvT
 SVruCmgtJ7u7RD/8uVDfPNR05DTSWQYzklJoKx2avKZj5FIx7ms=
 =/6Ue
 -----END PGP SIGNATURE-----

Merge tag 'kvm-s390-next-5.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

KVM: s390: pvdump and selftest improvements

- add an interface to provide a hypervisor dump for secure guests
- improve selftests to show tests
2022-06-07 12:28:53 -04:00
Janosch Frank
b0f46280d3 Documentation/virt/kvm/api.rst: Explain rc/rrc delivery
Let's explain in which situations the rc/rrc will set in struct
kvm_pv_cmd so it's clear that the struct members should be set to
0. rc/rrc are independent of the IOCTL return code.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20220517163629.3443-12-frankja@linux.ibm.com
Message-Id: <20220517163629.3443-12-frankja@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
2022-06-01 16:57:14 +02:00
Janosch Frank
437cfd714d Documentation/virt/kvm/api.rst: Add protvirt dump/info api descriptions
Time to add the dump API changes to the api documentation file.
Also some minor cleanup.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20220517163629.3443-11-frankja@linux.ibm.com
Message-Id: <20220517163629.3443-11-frankja@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
2022-06-01 16:57:14 +02:00
Janosch Frank
660a28653d Documentation: virt: Protected virtual machine dumps
Let's add a documentation file which describes the dump process. Since
we only copy the UV dump data from the UV to userspace we'll not go
into detail here and let the party which processes the data describe
its structure.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20220517163629.3443-10-frankja@linux.ibm.com
Message-Id: <20220517163629.3443-10-frankja@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
2022-06-01 16:57:14 +02:00
Linus Torvalds
bf9095424d 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
 -----BEGIN PGP SIGNATURE-----
 
 iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmKN9M4UHHBib256aW5p
 QHJlZGhhdC5jb20ACgkQv/vSX3jHroNLeAf+KizAlQwxEehHHeNyTkZuKyMawrD6
 zsqAENR6i1TxiXe7fDfPFbO2NR0ZulQopHbD9mwnHJ+nNw0J4UT7g3ii1IAVcXPu
 rQNRGMVWiu54jt+lep8/gDg0JvPGKVVKLhxUaU1kdWT9PhIOC6lwpP3vmeWkUfRi
 PFL/TMT0M8Nfryi0zHB0tXeqg41BiXfqO8wMySfBAHUbpv8D53D2eXQL6YlMM0pL
 2quB1HxHnpueE5vj3WEPQ3PCdy1M2MTfCDBJAbZGG78Ljx45FxSGoQcmiBpPnhJr
 C6UGP4ZDWpml5YULUoA70k5ylCbP+vI61U4vUtzEiOjHugpPV5wFKtx5nw==
 =ozWx
 -----END PGP SIGNATURE-----

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
  ...
2022-05-26 14:20:14 -07:00