From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vitaly Kuznetsov Subject: [PATCH] KVM: x86: svm: report MSR_IA32_MCG_EXT_CTL as unsupported Date: Wed, 19 Dec 2018 12:06:13 +0100 Message-ID: <20181219110613.24459-1-vkuznets@redhat.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , linux-kernel@vger.kernel.org, Tom Lendacky , Joerg Roedel , x86@kernel.org To: kvm@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org 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 --- 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 2acb42b74a51..dfdf7d0b7f88 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -5845,6 +5845,13 @@ 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; } -- 2.19.2