KVM: x86: Advertise AVX10_VNNI_INT CPUID to userspace

Browse source

Define and advertise AVX10_VNNI_INT CPUID to userspace when it's supported
by the host.

AVX10_VNNI_INT (0x24.0x1.ECX[bit 2]) is a discrete feature bit
introduced on Intel Diamond Rapids, which enumerates the support for
EVEX VPDP* instructions for INT8/INT16 [*].

Since this feature has no actual kernel usages, define it as a KVM-only
feature in reverse_cpuid.h.

Advertise new CPUID subleaf 0x24.0x1 with AVX10_VNNI_INT bit to
userspace for guest use. It's safe since no additional enabling work
is needed in the host kernel.

[*]: Intel Advanced Vector Extensions 10.2 Architecture Specification
     (rev 5.0).

Tested-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://patch.msgid.link/20251120050720.931449-5-zhao1.liu@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

...

This commit is contained in:

Zhao Liu 2025-11-20 13:07:20 +08:00 • committed by Sean Christopherson

parent 2ff8fb1e65

commit 062768f426

3 changed files with 22 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

1

arch/x86/include/asm/kvm_host.h

View file

18

arch/x86/kvm/cpuid.c

View file

4

arch/x86/kvm/reverse_cpuid.h

View file