linux.git/tools/include/uapi/linux/kvm.h, branch v7.1-rc3

Merge tag 'kvmarm-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

2026-04-13T09:49:54+00:00

KVM/arm64 updates for 7.1

* New features:

- Add support for tracing in the standalone EL2 hypervisor code,
  which should help both debugging and performance analysis.
  This comes with a full infrastructure for 'remote' trace buffers
  that can be exposed by non-kernel entities such as firmware.

- Add support for GICv5 Per Processor Interrupts (PPIs), as the
  starting point for supporting the new GIC architecture in KVM.

- Finally add support for pKVM protected guests, with anonymous
  memory being used as a backing store. About time!

* Improvements and bug fixes:

- Rework the dreaded user_mem_abort() function to make it more
  maintainable, reducing the amount of state being exposed to
  the various helpers and rendering a substantial amount of
  state immutable.

- Expand the Stage-2 page table dumper to support NV shadow
  page tables on a per-VM basis.

- Tidy up the pKVM PSCI proxy code to be slightly less hard
  to follow.

- Fix both SPE and TRBE in non-VHE configurations so that they
  do not generate spurious, out of context table walks that
  ultimately lead to very bad HW lockups.

- A small set of patches fixing the Stage-2 MMU freeing in error
  cases.

- Tighten-up accepted SMC immediate value to be only #0 for host
  SMCCC calls.

- The usual cleanups and other selftest churn.

tools headers UAPI: Sync linux/kvm.h with the kernel sources

2026-03-22T21:31:54+00:00

To pick the changes in:

  da142f3d373a6dda ("KVM: Remove subtle "struct kvm_stats_desc" pseudo-overlay")

That just rebuilds perf, as these patches don't add any new KVM ioctl to
be harvested for the 'perf trace' ioctl syscall argument beautifiers.

This addresses this perf build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h

Please see tools/include/uapi/README for further details.

Cc: Sean Christopherson 
Signed-off-by: Arnaldo Carvalho de Melo

KVM: arm64: gic-v5: Add ARM_VGIC_V5 device to KVM headers

2026-03-19T18:21:27+00:00

This is the base GICv5 device which is to be used with the
KVM_CREATE_DEVICE ioctl to create a GICv5-based vgic.

Signed-off-by: Sascha Bischoff 
Reviewed-by: Jonathan Cameron 
Link: https://patch.msgid.link/20260319154937.3619520-9-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier

tools headers UAPI: Sync linux/kvm.h with the kernel sources

2026-03-04T15:32:19+00:00

To pick the changes in:

  f7ab71f178d56447 ("KVM: s390: Add explicit padding to struct kvm_s390_keyop")
  0ee4ddc1647b8b3b ("KVM: s390: Storage key manipulation IOCTL")
  fa9893fadbc245e1 ("KVM: Introduce KVM_EXIT_SNP_REQ_CERTS for SNP certificate-fetching")
  f174a9ffcd48d78a ("KVM: arm64: Add exit to userspace on {LD,ST}64B* outside of memslots")

That just rebuilds perf, as these patches add just one new KVM ioctl,
but for S390, that is not being considered by tools/perf/trace/beauty/kvm_ioctl.sh
so far.

This addresses this perf build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h

Please see tools/include/uapi/README for further details.

Cc: Arnd Bergmann 
Cc: Claudio Imbrenda 
Cc: Marc Zyngier 
Cc: Michael Roth 
Cc: Sean Christopherson 
Cc: Will Deacon 
Signed-off-by: Arnaldo Carvalho de Melo

tools headers: Sync UAPI KVM headers with kernel sources

2025-12-24T19:42:13+00:00

To pick up changes from:

  ad9c62bd8946621e ("KVM: arm64: VM exit to userspace to handle SEA")
  8e8678e740ecde2a ("KVM: s390: Add capability that forwards operation exceptions")
  e0c26d47def7382d ("Merge tag 'kvm-s390-next-6.19-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD")
  7a61d61396b97fd6 ("KVM: SEV: Publish supported SEV-SNP policy bits")

This should be used to beautify DRM syscall arguments and it addresses
these tools/perf build warnings:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h
    diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h

Please see tools/include/uapi/README.

Cc: kvm@vger.kernel.org
Signed-off-by: Namhyung Kim

tools headers UAPI: Sync linux/kvm.h with the kernel sources

2025-11-03T16:10:19+00:00

To pick the changes in:

  fe2bf6234e947bf5 ("KVM: guest_memfd: Add INIT_SHARED flag, reject user page faults if not set")
  d2042d8f96ddefde ("KVM: Rework KVM_CAP_GUEST_MEMFD_MMAP into KVM_CAP_GUEST_MEMFD_FLAGS")
  3d3a04fad25a6621 ("KVM: Allow and advertise support for host mmap() on guest_memfd files")

That just rebuilds perf, as these patches don't add any new KVM ioctl to
be harvested for the 'perf trace' ioctl syscall argument beautifiers.

This addresses this perf build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h

Please see tools/include/uapi/README for further details.

Cc: Sean Christopherson 
Cc: Fuad Tabba 
Cc: Paolo Bonzini 
Signed-off-by: Arnaldo Carvalho de Melo

tools headers: Sync KVM headers with the kernel source

2025-08-18T18:52:22+00:00

To pick up the changes in this cset:

  f55ce5a6cd33211c KVM: arm64: Expose new KVM cap for cacheable PFNMAP
  28224ef02b56fcee KVM: TDX: Report supported optional TDVMCALLs in TDX capabilities
  4580dbef5ce0f95a KVM: TDX: Exit to userspace for SetupEventNotifyInterrupt
  25e8b1dd4883e6c2 KVM: TDX: Exit to userspace for GetTdVmCallInfo
  cf207eac06f661fb KVM: TDX: Handle TDG.VP.VMCALL

This addresses these perf build warnings:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h
    diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h

Please see tools/include/uapi/README for further details.

Cc: Paolo Bonzini 
Cc: kvm@vger.kernel.org
Signed-off-by: Namhyung Kim

Merge tag 'kvm-x86-misc-6.17' of https://github.com/kvm-x86/linux into HEAD

2025-07-29T12:36:43+00:00

KVM x86 misc changes for 6.17

 - Prevert the host's DEBUGCTL.FREEZE_IN_SMM (Intel only) when running the
   guest.  Failure to honor FREEZE_IN_SMM can bleed host state into the guest.

 - Explicitly check vmcs12.GUEST_DEBUGCTL on nested VM-Enter (Intel only) to
   prevent L1 from running L2 with features that KVM doesn't support, e.g. BTF.

 - Intercept SPEC_CTRL on AMD if the MSR shouldn't exist according to the
   vCPU's CPUID model.

 - Rework the MSR interception code so that the SVM and VMX APIs are more or
   less identical.

 - Recalculate all MSR intercepts from the "source" on MSR filter changes, and
   drop the dedicated "shadow" bitmaps (and their awful "max" size defines).

 - WARN and reject loading kvm-amd.ko instead of panicking the kernel if the
   nested SVM MSRPM offsets tracker can't handle an MSR.

 - Advertise support for LKGS (Load Kernel GS base), a new instruction that's
   loosely related to FRED, but is supported and enumerated independently.

 - Fix a user-triggerable WARN that syzkaller found by stuffing INIT_RECEIVED,
   a.k.a. WFS, and then putting the vCPU into VMX Root Mode (post-VMXON).  Use
   the same approach KVM uses for dealing with "impossible" emulation when
   running a !URG guest, and simply wait until KVM_RUN to detect that the vCPU
   has architecturally impossible state.

 - Add KVM_X86_DISABLE_EXITS_APERFMPERF to allow disabling interception of
   APERF/MPERF reads, so that a "properly" configured VM can "virtualize"
   APERF/MPERF (with many caveats).

 - Reject KVM_SET_TSC_KHZ if vCPUs have been created, as changing the "default"
   frequency is unsupported for VMs with a "secure" TSC, and there's no known
   use case for changing the default frequency for other VM types.

KVM: x86: Provide a capability to disable APERF/MPERF read intercepts

2025-07-09T16:33:37+00:00

Allow a guest to read the physical IA32_APERF and IA32_MPERF MSRs
without interception.

The IA32_APERF and IA32_MPERF MSRs are not virtualized. Writes are not
handled at all. The MSR values are not zeroed on vCPU creation, saved
on suspend, or restored on resume. No accommodation is made for
processor migration or for sharing a logical processor with other
tasks. No adjustments are made for non-unit TSC multipliers. The MSRs
do not account for time the same way as the comparable PMU events,
whether the PMU is virtualized by the traditional emulation method or
the new mediated pass-through approach.

Nonetheless, in a properly constrained environment, this capability
can be combined with a guest CPUID table that advertises support for
CPUID.6:ECX.APERFMPERF[bit 0] to induce a Linux guest to report the
effective physical CPU frequency in /proc/cpuinfo. Moreover, there is
no performance cost for this capability.

Signed-off-by: Jim Mattson 
Link: https://lore.kernel.org/r/20250530185239.2335185-3-jmattson@google.com
Reviewed-by: Xiaoyao Li 
Link: https://lore.kernel.org/r/20250626001225.744268-3-seanjc@google.com
Signed-off-by: Sean Christopherson

tools headers UAPI: Sync linux/kvm.h with the kernel sources

2025-06-16T17:05:11+00:00

To pick the changes in:

  5b9db9c16f428ada ("RISC-V: KVM: add KVM_CAP_RISCV_MP_STATE_RESET")
  a7484c80e5ca1ae0 ("KVM: arm64: Allow userspace to request KVM_ARM_VCPU_EL2*")
  79462faa2b2aa89d ("KVM: TDX: Handle TDG.VP.VMCALL")

That just rebuilds perf, as these patches don't add any new KVM ioctl to
be harvested for the the 'perf trace' ioctl syscall argument
beautifiers.

This addresses this perf build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h

Cc: Adrian Hunter 
Cc: Anup Patel 
Cc: Binbin Wu 
Cc: Ian Rogers 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: Kan Liang 
Cc: Marc Zyngier 
Cc: Namhyung Kim 
Cc: Paolo Bonzini 
Cc: Radim Krčmář 
Link: https://lore.kernel.org/r/aEruUUJvR0bfCg7_@x1
Signed-off-by: Arnaldo Carvalho de Melo