Re: [GIT PULL] KVM: x86: Misc changes for 7.1

[Paolo Bonzini]

On Sat, Apr 11, 2026 at 1:58 AM Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
>
> A truly misc bundle of changes.  A few minor fixes, some cleanups, some
> hardening, and one new feature (AVX512 BMM on AMD).
>
> The following changes since commit 11439c4635edd669ae435eec308f4ab8a0804808:
>
>   Linux 7.0-rc2 (2026-03-01 15:39:31 -0800)
>
> are available in the Git repository at:
>
>   https://github.com/kvm-x86/linux.git tags/kvm-x86-misc-7.1
>
> for you to fetch changes up to de0bfdc7137d5132b71dd1fe7aa3ca3df4d68241:
>
>   KVM: x86: Advertise AVX512 Bit Matrix Multiply (BMM) to userspace (2026-03-12 10:56:36 -0700)
>
> ----------------------------------------------------------------
> KVM x86 misc changes for 7.1
>
>  - Advertise support for AVX512 Bit Matrix Multiply (BMM) when it's present in
>    hardware (no additional emulation/virtualization required).
>
>  - Immediately fail the build if a required #define is missing in one of KVM's
>    headers that is included multiple times.
>
>  - Reject SET_GUEST_DEBUG with -EBUSY if there's an already injected exception,
>    mostly to prevent syzkaller from abusing the uAPI to trigger WARNs, but also
>    because it can help prevent userspace from unintentionally crashing the VM.
>
>  - Exempt SMM from CPUID faulting on Intel, as per the spec.
>
>  - Misc hardening and cleanup changes.

Pulled, thanks.

Paolo

> ----------------------------------------------------------------
> Anel Orazgaliyeva (1):
>       KVM: X86: Fix array_index_nospec protection in __pv_send_ipi
>
> Carlos López (1):
>       KVM: x86/pmu: annotate struct kvm_x86_pmu_event_filter with __counted_by()
>
> Jim Mattson (1):
>       KVM: x86: Ignore cpuid faulting in SMM
>
> Li RongQing (2):
>       KVM: Mark halt poll and other module parameters with appropriate memory attributes
>       KVM: SVM: Mark module parameters as __ro_after_init for security and performance
>
> Nikunj A Dadhania (1):
>       KVM: x86: Advertise AVX512 Bit Matrix Multiply (BMM) to userspace
>
> Sean Christopherson (1):
>       KVM: x86: Immediately fail the build when possible if required #define is missing
>
> Uros Bizjak (1):
>       KVM: x86: Zero-initialize temporary fxregs_state buffers in FXSAVE emulation
>
> Yosry Ahmed (4):
>       KVM: x86: Check for injected exceptions before queuing a debug exception
>       KVM: x86: Drop redundant call to kvm_deliver_exception_payload()
>       KVM: x86: Move some EFER bits enablement to common code
>       KVM: x86: Use kvm_cpu_cap_has() for EFER bits enablement checks
>
> xuanqingshi (1):
>       KVM: x86: Add LAPIC guard in kvm_apic_write_nodecode()
>
>  arch/x86/include/asm/cpufeatures.h     |  1 +
>  arch/x86/include/asm/kvm-x86-ops.h     | 10 +++++----
>  arch/x86/include/asm/kvm-x86-pmu-ops.h |  8 ++++---
>  arch/x86/include/asm/kvm_host.h        |  2 +-
>  arch/x86/kvm/cpuid.c                   |  6 ++++--
>  arch/x86/kvm/emulate.c                 | 10 ++++-----
>  arch/x86/kvm/lapic.c                   | 13 +++++++-----
>  arch/x86/kvm/pmu.c                     |  2 +-
>  arch/x86/kvm/svm/avic.c                |  4 ++--
>  arch/x86/kvm/svm/sev.c                 |  8 +++----
>  arch/x86/kvm/svm/svm.c                 | 39 ++++++++++++++--------------------
>  arch/x86/kvm/vmx/vmcs_shadow_fields.h  |  5 +++--
>  arch/x86/kvm/vmx/vmx.c                 |  4 ----
>  arch/x86/kvm/x86.c                     | 26 +++++++++++++++++------
>  virt/kvm/kvm_main.c                    | 12 +++++------
>  15 files changed, 81 insertions(+), 69 deletions(-)
>