KVM: SVM: Sync cr0 and cr3 to kvm state before nested handling

This patch syncs cr0 and cr3 from the vmcb to the kvm state
before nested intercept handling is done. This allows to
simplify the vmexit path.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/svm.c

@@ -1799,10 +1799,7 @@ static int nested_svm_vmexit(struct vcpu_svm *svm)
 	nested_vmcb->save.gdtr   = vmcb->save.gdtr;
 	nested_vmcb->save.idtr   = vmcb->save.idtr;
 	nested_vmcb->save.cr0    = kvm_read_cr0(&svm->vcpu);
-	if (npt_enabled)
-		nested_vmcb->save.cr3    = vmcb->save.cr3;
-	else
-		nested_vmcb->save.cr3    = svm->vcpu.arch.cr3;
+	nested_vmcb->save.cr3    = svm->vcpu.arch.cr3;
 	nested_vmcb->save.cr2    = vmcb->save.cr2;
 	nested_vmcb->save.cr4    = svm->vcpu.arch.cr4;
 	nested_vmcb->save.rflags = vmcb->save.rflags;
@@ -2641,6 +2638,11 @@ static int handle_exit(struct kvm_vcpu *vcpu)
 
 	trace_kvm_exit(exit_code, vcpu);
 
+	if (!(svm->vmcb->control.intercept_cr_write & INTERCEPT_CR0_MASK))
+		vcpu->arch.cr0 = svm->vmcb->save.cr0;
+	if (npt_enabled)
+		vcpu->arch.cr3 = svm->vmcb->save.cr3;
+
 	if (unlikely(svm->nested.exit_required)) {
 		nested_svm_vmexit(svm);
 		svm->nested.exit_required = false;
@@ -2668,11 +2670,6 @@ static int handle_exit(struct kvm_vcpu *vcpu)
 
 	svm_complete_interrupts(svm);
 
-	if (!(svm->vmcb->control.intercept_cr_write & INTERCEPT_CR0_MASK))
-		vcpu->arch.cr0 = svm->vmcb->save.cr0;
-	if (npt_enabled)
-		vcpu->arch.cr3 = svm->vmcb->save.cr3;
-
 	if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
 		kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
 		kvm_run->fail_entry.hardware_entry_failure_reason