[tip: x86/sev] x86/sev: Add the Secure TSC feature for SNP guests

tip-bot2 for Nikunj A Dadhania
2025-01-09T09:43:46Z

The following commit has been merged into the x86/sev branch of tip:

Commit-ID: 0563ee35ae2c9cfb0c6a7b2c0ddf7d9372bb8a98
Gitweb: https://git.kernel.org/tip/0563ee35ae2c9cfb0c6a7b2c0ddf7d9372bb8a98
Author: Nikunj A Dadhania <nikunj@amd.com>
AuthorDate: Mon, 06 Jan 2025 18:16:33 +05:30
Committer: Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Thu, 09 Jan 2025 10:21:56 +01:00

x86/sev: Add the Secure TSC feature for SNP guests

Now that all the required plumbing is done for enabling Secure TSC, add it to
the SNP features present list.

Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Peter Gonda <pgonda@google.com>
Link: https://lore.kernel.org/r/20250106124633.1418972-14-nikunj@amd.com
---
arch/x86/boot/compressed/sev.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c
index cd44e12..bb55934 100644
--- a/arch/x86/boot/compressed/sev.c
+++ b/arch/x86/boot/compressed/sev.c
@@ -401,7 +401,8 @@ finish:
* by the guest kernel. As and when a new feature is implemented in the
* guest kernel, a corresponding bit should be added to the mask.
*/
-#define SNP_FEATURES_PRESENT MSR_AMD64_SNP_DEBUG_SWAP
+#define SNP_FEATURES_PRESENT (MSR_AMD64_SNP_DEBUG_SWAP | \
+ MSR_AMD64_SNP_SECURE_TSC)

u64 snp_get_unsupported_features(u64 status)
{