linux-kernel - [Part2 PATCH v9 06/38] KVM: X86: Extend CPUID range to include new leaf

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Message-Id: <20171205010438.5773-7-brijesh.singh@amd.com>
Date:   Mon,  4 Dec 2017 19:04:06 -0600
From:   Brijesh Singh <brijesh.singh@....com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     bp@...en8.de, Brijesh Singh <brijesh.singh@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: [Part2 PATCH v9 06/38] KVM: X86: Extend CPUID range to include new leaf

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@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: "Radim Krčmář" <rkrcmar@...hat.com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Borislav Petkov <bp@...e.de>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: x86@...nel.org
Cc: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Reviewed-by: Borislav Petkov <bp@...e.de>
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 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 e403cf1f6ba3..7e302a25bc45 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5170,6 +5170,12 @@ 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