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KVM: nSVM: Don't sync tlb_ctl back to vmcb12 on nested VM-Exit

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Don't sync the TLB control field from vmcb02 to vmcs12 on nested VM-Exit.
Per AMD's APM, the field is not modified by hardware:

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

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Tested-by: Santosh Shukla <Santosh.Shukla@amd.com>
Link: https://lore.kernel.org/r/20221129193717.513824-2-mlevitsk@redhat.com
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Maxim Levitsky 2022-11-29 21:37:07 +02:00 • committed by Sean Christopherson
parent a31b531cd2
commit 8957cbcfed
1 changed files with 0 additions and 1 deletions
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arch/x86/kvm/svm/nested.c
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@ -1008,7 +1008,6 @@ 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;