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    Subject[PATCH v2 01/11] KVM: nSVM: don't sync back tlb_ctl on nested VM exit
    Date
    The CPU doesn't change TLB_CTL value as stated in the PRM (15.16.2):

    "The VMRUN instruction reads, but does not change, the
    value of the TLB_CONTROL field"

    Therefore the KVM shouldn't do that either.

    Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
    ---
    arch/x86/kvm/svm/nested.c | 1 -
    1 file changed, 1 deletion(-)

    diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
    index bc9cd7086fa972..37af0338da7c32 100644
    --- a/arch/x86/kvm/svm/nested.c
    +++ b/arch/x86/kvm/svm/nested.c
    @@ -1010,7 +1010,6 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
    vmcb12->control.next_rip = vmcb02->control.next_rip;

    vmcb12->control.int_ctl = svm->nested.ctl.int_ctl;
    - vmcb12->control.tlb_ctl = svm->nested.ctl.tlb_ctl;
    vmcb12->control.event_inj = svm->nested.ctl.event_inj;
    vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err;

    --
    2.26.3
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