linux-kernel - [RFC Part2 PATCH v3 08/26] KVM: X86: Extend CPUID range to include new leaf

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Date:   Mon, 24 Jul 2017 15:02:45 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...e.de>,
        Joerg Roedel <joro@...tes.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        \"Radim Krčmář\" 
        <rkrcmar@...hat.com>, Tom Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>
Subject: [RFC Part2 PATCH v3 08/26] KVM: X86: Extend CPUID range to include new leaf

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

Signed-off-by: Brijesh Singh <brijesh.singh@....com>
---
 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 59ca2ee..372e969 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -599,7 +599,7 @@ 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 1cd7c78..256c9df 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5131,6 +5131,12 @@ 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);
+
 	}
 }
 
-- 
2.9.4