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.
See APM2 Table 15-34 and B-4 for more details.
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Joerg Roedel <jroedel@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Cc: Wanpeng Li <wanpengli@xxxxxxxxxxx>
Cc: Jim Mattson <jmattson@xxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
---
arch/x86/include/asm/svm.h | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 1c561945b426..c38783a1d24f 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)
+
struct vmcb_seg {
u16 selector;
u16 attrib;
@@ -293,7 +302,8 @@ struct vmcb_save_area {
u64 sw_exit_info_1;
u64 sw_exit_info_2;
u64 sw_scratch;
- u8 reserved_11[56];
+ u64 sev_features;
+ u8 reserved_11[48];
u64 xcr0;
u8 valid_bitmap[16];
u64 x87_state_gpa;
--
2.17.1
