linux-kernel - Re: [PATCH 1/2] x86/cpufeatures: Add virtual TSC

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Message-ID: <Yk/5kIlcAuW/RuDj@zn.tnic>
Date:   Fri, 8 Apr 2022 11:00:00 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Babu Moger <babu.moger@....com>
Cc:     tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
        hpa@...or.com, pbonzini@...hat.com, seanjc@...gle.com,
        vkuznets@...hat.com, jmattson@...gle.com, joro@...tes.org,
        wanpengli@...cent.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 1/2] x86/cpufeatures: Add virtual TSC_AUX feature bit

On Thu, Apr 07, 2022 at 07:57:50PM -0500, Babu Moger wrote:
> The TSC_AUX Virtualization feature allows AMD SEV-ES guests to securely use
> TSC_AUX (auxiliary time stamp counter data) MSR in RDTSCP and RDPID
> instructions.
> 
> The TSC_AUX MSR is typically initialized to APIC ID or another unique
> identifier so that software can quickly associate returned TSC value
> with the logical processor.
> 
> Adds the feature bit and also include it in the kvm for detection.

s/Adds/Add/

> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
>  arch/x86/include/asm/cpufeatures.h |    1 +
>  arch/x86/kvm/cpuid.c               |    2 +-
>  2 files changed, 2 insertions(+), 1 deletion(-)

With that fixed:

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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