diff -Naur linux-2.6.34/arch/x86/kvm/vmx.c linux-2.6.34.new/arch/x86/kvm/vmx.c
--- linux-2.6.34/arch/x86/kvm/vmx.c	2010-07-06 20:41:21.000000000 +0700
+++ linux-2.6.34.new/arch/x86/kvm/vmx.c	2010-07-06 20:40:34.000000000 +0700
@@ -1648,17 +1648,15 @@
 			     (guest_tr_ar & ~AR_TYPE_MASK)
 			     | AR_TYPE_BUSY_64_TSS);
 	}
-	vcpu->arch.efer |= EFER_LMA;
-	vmx_set_efer(vcpu, vcpu->arch.efer);
+	vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA);
 }
 
 static void exit_lmode(struct kvm_vcpu *vcpu)
 {
-	vcpu->arch.efer &= ~EFER_LMA;
-
 	vmcs_write32(VM_ENTRY_CONTROLS,
 		     vmcs_read32(VM_ENTRY_CONTROLS)
 		     & ~VM_ENTRY_IA32E_MODE);
+	vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA);
 }
 
 #endif