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Subject: Re: [PATCH v2 1/4] x86: kvm: Update the reverse_cpuid list to include
 CPUID_7_EDX
To:     KarimAllah Ahmed <karahmed@amazon.de>, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org, x86@kernel.org
Cc:     =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H . Peter Anvin" <hpa@zytor.com>
References: <1517187532-32286-1-git-send-email-karahmed@amazon.de>
 <1517187532-32286-2-git-send-email-karahmed@amazon.de>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <8a22b15e-18b1-da31-a2b9-9fdf1148e82c@redhat.com>
Date:   Mon, 29 Jan 2018 11:37:03 +0100
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On 29/01/2018 01:58, KarimAllah Ahmed wrote:
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Radim Krčmář <rkrcmar@redhat.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: H. Peter Anvin <hpa@zytor.com>
> Cc: x86@kernel.org
> Cc: kvm@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.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