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    Subject[PATCH 4.20 245/352] KVM: x86: svm: report MSR_IA32_MCG_EXT_CTL as unsupported
    Date
    4.20-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    [ 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@redhat.com>
    Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    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 101f53ccf571..11641d9e7f6f 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -5836,6 +5836,13 @@ 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


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