On Mon, Feb 10, 2025 at 02:52:27PM +0530, Nikunj A Dadhania wrote:
> The Secure TSC feature for SEV-SNP allows guests to securely use the RDTSC
> and RDTSCP instructions, ensuring that the parameters used cannot be
> altered by the hypervisor once the guest is launched. For more details,
> refer to the AMD64 APM Vol 2, Section "Secure TSC".
>
> Signed-off-by: Nikunj A Dadhania <nikunj@xxxxxxx>
> ---
> 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 508c0dad116b..921ed26b0be7 100644
> --- a/arch/x86/include/asm/cpufeatures.h
> +++ b/arch/x86/include/asm/cpufeatures.h
> @@ -448,6 +448,7 @@
> #define X86_FEATURE_VM_PAGE_FLUSH (19*32+ 2) /* VM Page Flush MSR is supported */
> #define X86_FEATURE_SEV_ES (19*32+ 3) /* "sev_es" Secure Encrypted Virtualization - Encrypted State */
> #define X86_FEATURE_SEV_SNP (19*32+ 4) /* "sev_snp" Secure Encrypted Virtualization - Secure Nested Paging */
> +#define X86_FEATURE_SNP_SECURE_TSC (19*32+ 8) /* SEV-SNP Secure TSC */
> #define X86_FEATURE_V_TSC_AUX (19*32+ 9) /* Virtual TSC_AUX */
> #define X86_FEATURE_SME_COHERENT (19*32+10) /* hardware-enforced cache coherency */
> #define X86_FEATURE_DEBUG_SWAP (19*32+14) /* "debug_swap" SEV-ES full debug state swap support */
> --
Acked-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
