The hypervisor uses the SEV_FEATURES field (offset 3B0h) in the Save State
Area to control the SEV-SNP guest features such as SNPActive, vTOM,
ReflectVC etc. An SEV-SNP guest can read the SEV_FEATURES fields through
the SEV_STATUS MSR.

While at it, update the dump_vmcb() to log the VMPL level.

See APM2 Table 15-34 and B-4 for more details.

Signed-off-by: Brijesh Singh <redacted>
---
 arch/x86/include/asm/svm.h | 15 +++++++++++++--
 arch/x86/kvm/svm/svm.c     |  4 ++--
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 772e60efe243..ff614cdcf628 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h

@@ -212,6 +212,15 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
 #define SVM_NESTED_CTL_SEV_ENABLE	BIT(1)
 #define SVM_NESTED_CTL_SEV_ES_ENABLE	BIT(2)
 
+#define SVM_SEV_FEATURES_SNP_ACTIVE		BIT(0)
+#define SVM_SEV_FEATURES_VTOM			BIT(1)
+#define SVM_SEV_FEATURES_REFLECT_VC		BIT(2)
+#define SVM_SEV_FEATURES_RESTRICTED_INJECTION	BIT(3)
+#define SVM_SEV_FEATURES_ALTERNATE_INJECTION	BIT(4)
+#define SVM_SEV_FEATURES_DEBUG_SWAP		BIT(5)
+#define SVM_SEV_FEATURES_PREVENT_HOST_IBS	BIT(6)
+#define SVM_SEV_FEATURES_BTB_ISOLATION		BIT(7)