linux-kernel - Re: [PATCH v2 1/4] x86: kvm: Update the reverse_cpuid list to include CPUID_7

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Date:   Mon, 29 Jan 2018 11:37:03 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     KarimAllah Ahmed <karahmed@...zon.de>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 1/4] x86: kvm: Update the reverse_cpuid list to include
 CPUID_7_EDX

On 29/01/2018 01:58, KarimAllah Ahmed wrote:
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Radim Krčmář <rkrcmar@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: x86@...nel.org
> Cc: kvm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: KarimAllah Ahmed <karahmed@...zon.de>
> ---
>  arch/x86/kvm/cpuid.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
> index cdc70a3..dcfe227 100644
> --- a/arch/x86/kvm/cpuid.h
> +++ b/arch/x86/kvm/cpuid.h
> @@ -54,6 +54,7 @@ static const struct cpuid_reg reverse_cpuid[] = {
>  	[CPUID_8000_000A_EDX] = {0x8000000a, 0, CPUID_EDX},
>  	[CPUID_7_ECX]         = {         7, 0, CPUID_ECX},
>  	[CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
> +	[CPUID_7_EDX]         = {         7, 0, CPUID_EDX},
>  };
>  
>  static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)
> 

You can also stop using KF(...) and KVM_CPUID_BIT_* for bits that come
from this leaf.  F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(IBRS) will be
enough.

Paolo