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>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7127a134d6fd65a09a9330f38095b39d7cf78299..f3f86b234d5269deed38eeb99a63533a8c6d8e31 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -835,7 +835,6 @@ 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)