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[01/13] KVM: nSVM: don't sync back tlb_ctl on nested VM exit

Message ID 20221117143242.102721-2-mlevitsk@redhat.com (mailing list archive)
State New, archived
Headers show
Series SVM: vNMI (with my fixes) | expand

Commit Message

Maxim Levitsky Nov. 17, 2022, 2:32 p.m. UTC 
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 shoudn't do that either.

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

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index b258d6988f5dde..43cc4a5d22e012 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -989,7 +989,6 @@  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;