[Part2 PATCH v4 10/29] KVM: X86: Extend CPUID range to include new leaf

[Brijesh Singh]

This CPUID leaf provides the memory encryption support information on
AMD Platform. Its complete description is available in APM volume 2,
Section 15.34

Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: "Radim KrÄmÃÅ" <rkrcmar@xxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
Reviewed-by: Borislav Petkov <bp@xxxxxxx>
---
 arch/x86/kvm/cpuid.c | 2 +-
 arch/x86/kvm/svm.c   | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 0099e10eb045..c6473ca825cd 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -604,7 +604,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 		entry->edx = 0;
 		break;
 	case 0x80000000:
-		entry->eax = min(entry->eax, 0x8000001a);
+		entry->eax = min(entry->eax, 0x8000001f);
 		break;
 	case 0x80000001:
 		entry->edx &= kvm_cpuid_8000_0001_edx_x86_features;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 360f4b90f48d..3535aa510194 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5163,6 +5163,12 @@ static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
 			entry->edx |= SVM_FEATURE_NPT;
 
 		break;
+	case 0x8000001F:
+		/* Support memory encryption cpuid if host supports it */
+		if (boot_cpu_has(X86_FEATURE_SEV))
+			cpuid(0x8000001f, &entry->eax, &entry->ebx,
+				&entry->ecx, &entry->edx);
+
 	}
 }
 
-- 
2.9.5