From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> [ Upstream commit e87555e550cef4941579cd879759a7c0dee24e68 ] 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@xxxxxxxxxx> Signed-off-by: Radim Krčmář <rkrcmar@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 fa1b0e3c8a06..c8efacf2e65f 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -5223,6 +5223,13 @@ 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; } -- 2.19.1