linux-kernel - Re: [RFC PATCH 02/13] x86/cpufeatures: Introduce x2AVIC CPUID bit

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Message-ID: <b7c2e257c8080f9724ee2ca96642d45d968a8b00.camel@redhat.com>
Date:   Thu, 24 Feb 2022 18:32:06 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     pbonzini@...hat.com, seanjc@...gle.com, joro@...tes.org,
        jon.grimm@....com, wei.huang2@....com, terry.bowman@....com
Subject: Re: [RFC PATCH 02/13] x86/cpufeatures: Introduce x2AVIC CPUID bit

On Sun, 2022-02-20 at 20:19 -0600, Suravee Suthikulpanit wrote:
> Introduce a new feature bit for virtualized x2APIC (x2AVIC) in
> CPUID_Fn8000000A_EDX [SVM Revision and Feature Identification].
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  arch/x86/include/asm/cpufeatures.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> index 6db4e2932b3d..8c91a313668e 100644
> --- a/arch/x86/include/asm/cpufeatures.h
> +++ b/arch/x86/include/asm/cpufeatures.h
> @@ -345,6 +345,7 @@
>  #define X86_FEATURE_AVIC		(15*32+13) /* Virtual Interrupt Controller */
>  #define X86_FEATURE_V_VMSAVE_VMLOAD	(15*32+15) /* Virtual VMSAVE VMLOAD */
>  #define X86_FEATURE_VGIF		(15*32+16) /* Virtual GIF */
> +#define X86_FEATURE_X2AVIC		(15*32+18) /* Virtual x2apic */
>  #define X86_FEATURE_V_SPEC_CTRL		(15*32+20) /* Virtual SPEC_CTRL */
>  #define X86_FEATURE_SVME_ADDR_CHK	(15*32+28) /* "" SVME addr check */
>  
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky