linux-kernel - Re: [PATCH v16 05/13] x86/sev: Add Secure TSC support for SNP guests

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Message-ID: <20250107104227.GEZ30FE1kUWP2ArRkD@fat_crate.local>
Date: Tue, 7 Jan 2025 11:42:27 +0100
From: Borislav Petkov <bp@...en8.de>
To: Nikunj A Dadhania <nikunj@....com>
Cc: linux-kernel@...r.kernel.org, thomas.lendacky@....com, x86@...nel.org,
	kvm@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
	dave.hansen@...ux.intel.com, pgonda@...gle.com, seanjc@...gle.com,
	pbonzini@...hat.com, francescolavra.fl@...il.com
Subject: Re: [PATCH v16 05/13] x86/sev: Add Secure TSC support for SNP guests

On Mon, Jan 06, 2025 at 06:16:25PM +0530, Nikunj A Dadhania wrote:
> diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c
> index 0f81f70aca82..715c2c09582f 100644
> --- a/arch/x86/coco/core.c
> +++ b/arch/x86/coco/core.c
> @@ -97,6 +97,10 @@ static bool noinstr amd_cc_platform_has(enum cc_attr attr)
>  	case CC_ATTR_GUEST_SEV_SNP:
>  		return sev_status & MSR_AMD64_SEV_SNP_ENABLED;
>  
> +	case CC_ATTR_GUEST_SNP_SECURE_TSC:
> +		return (sev_status & MSR_AMD64_SEV_SNP_ENABLED) &&

This is new here?

> +			(sev_status & MSR_AMD64_SNP_SECURE_TSC);
> +

-- 
Regards/Gruss,
    Boris.

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