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
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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