[PATCH v2 01/11] KVM: nSVM: don't sync back tlb_ctl on nested VM exit

[Maxim Levitsky]

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@xxxxxxxxxx>
---
 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