linux-kernel - Re: [PATCH] KVM: x86: Expose fast short REP MOV for supported cpuid

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Message-ID: <5bf4035d-4c37-be3f-cfe2-759ccc0bc17d@redhat.com>
Date:   Mon, 23 Mar 2020 13:58:56 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Zhenyu Wang <zhenyuw@...ux.intel.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: Expose fast short REP MOV for supported cpuid

On 23/03/20 10:22, Zhenyu Wang wrote:
> For CPU supporting fast short REP MOV (XF86_FEATURE_FSRM) e.g Icelake,
> Tigerlake, expose it in KVM supported cpuid as well.
> 
> Signed-off-by: Zhenyu Wang <zhenyuw@...ux.intel.com>
> ---
>  arch/x86/kvm/cpuid.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 435a7da07d5f..cf6da12bd17a 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -338,7 +338,7 @@ void kvm_set_cpu_caps(void)
>  	kvm_cpu_cap_mask(CPUID_7_EDX,
>  		F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
>  		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
> -		F(MD_CLEAR) | F(AVX512_VP2INTERSECT)
> +		F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM)
>  	);
>  
>  	/* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */
> 

Queued, thanks.

Paolo