Patch-mainline: v5.0-rc1

Git-commit: e87555e550cef4941579cd879759a7c0dee24e68

References: git-fixes

From: Vitaly Kuznetsov <vkuznets@redhat.com>

Date: Wed, 19 Dec 2018 12:06:13 +0100

Subject: [PATCH] KVM: x86: svm: report MSR_IA32_MCG_EXT_CTL as unsupported

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AMD doesn't seem to implement MSR_IA32_MCG_EXT_CTL and svm code in kvm

knows nothing about it, however, this MSR is among emulated_msrs and

thus returned with KVM_GET_MSR_INDEX_LIST. The consequent KVM_GET_MSRS,

of course, fails.

Report the MSR as unsupported to not confuse userspace.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

Signed-off-by: Juergen Gross <jgross@suse.com>

---

 arch/x86/kvm/svm.c | 7 +++++++

 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c

index e4f18a305ef6..c4377f02a33b 100644

--- a/arch/x86/kvm/svm.c

+++ b/arch/x86/kvm/svm.c

@@ -5840,6 +5840,13 @@ static bool svm_cpu_has_accelerated_tpr(void)

 static bool svm_has_emulated_msr(int index)

 {

+	switch (index) {

+	case MSR_IA32_MCG_EXT_CTL:

+		return false;

+	default:

+		break;

+	}

+

 	return true;

 }

-- 

2.35.3