[PATCH v3 17/17] x86/sev: Indicate SEV-SNP guest supports Secure AVIC

[Neeraj Upadhyay]

Now that Secure AVIC support is added in the guest, indicate SEV-SNP
guest supports Secure AVIC feature if CONFIG_AMD_SECURE_AVIC is
enabled.

Co-developed-by: Kishon Vijay Abraham I <kvijayab@xxxxxxx>
Signed-off-by: Kishon Vijay Abraham I <kvijayab@xxxxxxx>
Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@xxxxxxx>
---
Changes since v2:
 - Set SNP_FEATURE_SECURE_AVIC in SNP_FEATURES_PRESENT only when
   CONFIG_AMD_SECURE_AVIC is enabled.

 arch/x86/boot/compressed/sev.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c
index 798fdd3dbd1e..adcbf53ad50d 100644
--- a/arch/x86/boot/compressed/sev.c
+++ b/arch/x86/boot/compressed/sev.c
@@ -397,13 +397,20 @@ void do_boot_stage2_vc(struct pt_regs *regs, unsigned long exit_code)
 				 MSR_AMD64_SNP_SECURE_AVIC |		\
 				 MSR_AMD64_SNP_RESERVED_MASK)
 
+#ifdef CONFIG_AMD_SECURE_AVIC
+#define SNP_FEATURE_SECURE_AVIC		MSR_AMD64_SNP_SECURE_AVIC
+#else
+#define SNP_FEATURE_SECURE_AVIC		0
+#endif
+
 /*
  * SNP_FEATURES_PRESENT is the mask of SNP features that are implemented
  * 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 |	\
-				 MSR_AMD64_SNP_SECURE_TSC)
+				 MSR_AMD64_SNP_SECURE_TSC |	\
+				 SNP_FEATURE_SECURE_AVIC)
 
 u64 snp_get_unsupported_features(u64 status)
 {
-- 
2.34.1