[0/2] Enumerate and expose AVX_VNNI feature

Message

Yang Zhong Jan. 5, 2021, 12:49 a.m. UTC

A processor supports AVX_VNNI instructions if CPUID.(EAX=7,ECX=1):EAX[bit 4]
is present.

This series includes kernel and kvm patches, kernel patch define this
new cpu feature bit and kvm expose this bit to guest. When this bit is
enabled on cpu or vcpu, the cpu feature flag is shown as "avx_vnni" in
/proc/cpuinfo of host and guest.

Detailed information on the instruction and CPUID feature flag can be
found in the latest "extensions" manual [1].

Reference:
[1]. https://software.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html


Kyung Min Park (1):
  Enumerate AVX Vector Neural Network instructions

Yang Zhong (1):
  KVM: Expose AVX_VNNI instruction to guset

 arch/x86/include/asm/cpufeatures.h | 1 +
 arch/x86/kvm/cpuid.c               | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

Comments

Paolo Bonzini Jan. 21, 2021, 3:02 p.m. UTC | #1

On 05/01/21 01:49, Yang Zhong wrote:
> A processor supports AVX_VNNI instructions if CPUID.(EAX=7,ECX=1):EAX[bit 4]
> is present.
> 
> This series includes kernel and kvm patches, kernel patch define this
> new cpu feature bit and kvm expose this bit to guest. When this bit is
> enabled on cpu or vcpu, the cpu feature flag is shown as "avx_vnni" in
> /proc/cpuinfo of host and guest.
> 
> Detailed information on the instruction and CPUID feature flag can be
> found in the latest "extensions" manual [1].
> 
> Reference:
> [1]. https://software.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html
> 
> 
> Kyung Min Park (1):
>    Enumerate AVX Vector Neural Network instructions
> 
> Yang Zhong (1):
>    KVM: Expose AVX_VNNI instruction to guset
> 
>   arch/x86/include/asm/cpufeatures.h | 1 +
>   arch/x86/kvm/cpuid.c               | 2 +-
>   2 files changed, 2 insertions(+), 1 deletion(-)
> 

Queued, thanks.

Paolo

Yang Zhong Jan. 22, 2021, 6:43 a.m. UTC | #2

On Thu, Jan 21, 2021 at 04:02:17PM +0100, Paolo Bonzini wrote:
> On 05/01/21 01:49, Yang Zhong wrote:
> >A processor supports AVX_VNNI instructions if CPUID.(EAX=7,ECX=1):EAX[bit 4]
> >is present.
> >
> >This series includes kernel and kvm patches, kernel patch define this
> >new cpu feature bit and kvm expose this bit to guest. When this bit is
> >enabled on cpu or vcpu, the cpu feature flag is shown as "avx_vnni" in
> >/proc/cpuinfo of host and guest.
> >
> >Detailed information on the instruction and CPUID feature flag can be
> >found in the latest "extensions" manual [1].
> >
> >Reference:
> >[1]. https://software.intel.com/content/www/us/en/develop/download/intel-architecture-instruction-set-extensions-programming-reference.html
> >
> >
> >Kyung Min Park (1):
> >   Enumerate AVX Vector Neural Network instructions
> >
> >Yang Zhong (1):
> >   KVM: Expose AVX_VNNI instruction to guset
> >
> >  arch/x86/include/asm/cpufeatures.h | 1 +
> >  arch/x86/kvm/cpuid.c               | 2 +-
> >  2 files changed, 2 insertions(+), 1 deletion(-)
> >
> 
> Queued, thanks.
> 
> Paolo

  Paolo, thanks, i will send the related Qemu patch soon.

  Yang