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

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Message-ID: <eee07399-df81-83ed-d410-18b42d51e26c@redhat.com>
Date:   Thu, 21 Jan 2021 16:02:17 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Yang Zhong <yang.zhong@...el.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, kvm@...r.kernel.org
Cc:     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
Subject: Re: [PATCH 0/2] Enumerate and expose AVX_VNNI feature

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