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KVM: Don't reset mmu context unnecessarily when updating EFER 

The only bit of EFER that affects the mmu is NX, and this is already
accounted for (LME only takes effect when changing cr0).

Based on a patch by Hillf Danton.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-10-11 14:23:39 +02:00
parent d0dfc6b74a
commit 010c520e20
1 changed files with 0 additions and 1 deletions
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arch/x86/kvm/x86.c
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@ -830,7 +830,6 @@ static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
kvm_x86_ops->set_efer(vcpu, efer);
vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
kvm_mmu_reset_context(vcpu);
/* Update reserved bits */
if ((efer ^ old_efer) & EFER_NX)