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    Subject[PATCH MANUALSEL 5.15 3/8] KVM: nVMX: Also filter MSR_IA32_VMX_TRUE_PINBASED_CTLS when eVMCS
    Date
    From: Vitaly Kuznetsov <vkuznets@redhat.com>

    [ Upstream commit f80ae0ef089a09e8c18da43a382c3caac9a424a7 ]

    Similar to MSR_IA32_VMX_EXIT_CTLS/MSR_IA32_VMX_TRUE_EXIT_CTLS,
    MSR_IA32_VMX_ENTRY_CTLS/MSR_IA32_VMX_TRUE_ENTRY_CTLS pair,
    MSR_IA32_VMX_TRUE_PINBASED_CTLS needs to be filtered the same way
    MSR_IA32_VMX_PINBASED_CTLS is currently filtered as guests may solely rely
    on 'true' MSR data.

    Note, none of the currently existing Windows/Hyper-V versions are known
    to stumble upon the unfiltered MSR_IA32_VMX_TRUE_PINBASED_CTLS, the change
    is aimed at making the filtering future proof.

    Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
    Message-Id: <20220112170134.1904308-2-vkuznets@redhat.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/x86/kvm/vmx/evmcs.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/arch/x86/kvm/vmx/evmcs.c b/arch/x86/kvm/vmx/evmcs.c
    index ba6f99f584ac3..a7ed30d5647af 100644
    --- a/arch/x86/kvm/vmx/evmcs.c
    +++ b/arch/x86/kvm/vmx/evmcs.c
    @@ -362,6 +362,7 @@ void nested_evmcs_filter_control_msr(u32 msr_index, u64 *pdata)
    case MSR_IA32_VMX_PROCBASED_CTLS2:
    ctl_high &= ~EVMCS1_UNSUPPORTED_2NDEXEC;
    break;
    + case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
    case MSR_IA32_VMX_PINBASED_CTLS:
    ctl_high &= ~EVMCS1_UNSUPPORTED_PINCTRL;
    break;
    --
    2.34.1
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