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

Borislav Petkov
2025-01-08T08:05:43Z

On Wed, Jan 08, 2025 at 01:17:11PM +0530, Nikunj A. Dadhania wrote:
> diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
> index 00a0ac3baab7..763cfeb65b2f 100644
> --- a/arch/x86/coco/sev/core.c
> +++ b/arch/x86/coco/sev/core.c
> @@ -3218,7 +3218,8 @@ static int __init snp_get_tsc_info(void)
>
> void __init snp_secure_tsc_prepare(void)
> {
> - if (!cc_platform_has(CC_ATTR_GUEST_SNP_SECURE_TSC))
> + if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP) ||
> + !cc_platform_has(CC_ATTR_GUEST_SNP_SECURE_TSC))

So how is moving the CC_ATTR_GUEST_SEV_SNP check here make any sense?

I simply zapped the MSR_AMD64_SEV_SNP_ENABLED check above locally.

--
Regards/Gruss,
Boris.