Messages in this thread Patch in this message | | | From | Brijesh Singh <> | Subject | [RFC Part2 PATCH 15/30] KVM: SVM: define new SEV_FEATURES field in the VMCB Save State Area | Date | Wed, 24 Mar 2021 12:04:21 -0500 |
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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@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Joerg Roedel <jroedel@suse.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: David Rientjes <rientjes@google.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Wanpeng Li <wanpengli@tencent.com> Cc: Jim Mattson <jmattson@google.com> Cc: x86@kernel.org Cc: kvm@vger.kernel.org Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> --- 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
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