linux-kernel - Re: [PATCH 0/2] Enumerate and expose AVX

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Message-ID: <20210122064327.GA25155@yangzhon-Virtual>
Date:   Fri, 22 Jan 2021 14:43:27 +0800
From:   Yang Zhong <yang.zhong@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        tony.luck@...el.com, seanjc@...gle.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        kyung.min.park@...el.com, yang.zhong@...el.com
Subject: Re: [PATCH 0/2] Enumerate and expose AVX_VNNI feature

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