KVM: x86: clarify leave_smm() return value

The return value of vmx_leave_smm() is unrelated from that of
nested_vmx_enter_non_root_mode().  Check explicitly for success
(which happens to be 0) and return 1 just like everywhere
else in vmx_leave_smm().

Likewise, in svm_leave_smm() return 0/1 instead of the 0/1/-errno
returned by tenter_svm_guest_mode().

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: bonzini

arch/x86/kvm/svm/svm.c

@@ -4884,11 +4884,11 @@ static int svm_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram)
 	if (nested_svm_check_cached_vmcb12(vcpu) < 0)
 		goto unmap_save;
 
-	ret = enter_svm_guest_mode(vcpu, smram64->svm_guest_vmcb_gpa, vmcb12, false);
-
-	if (ret)
+	if (enter_svm_guest_mode(vcpu, smram64->svm_guest_vmcb_gpa,
+				 vmcb12, false) != 0)
 		goto unmap_save;
 
+	ret = 0;
 	svm->nested.nested_run_pending = 1;
 
 unmap_save:

arch/x86/kvm/vmx/vmx.c

@@ -8533,8 +8533,8 @@ int vmx_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram)
 			return 1;
 
 		ret = nested_vmx_enter_non_root_mode(vcpu, false);
-		if (ret)
-			return ret;
+		if (ret != NVMX_VMENTRY_SUCCESS)
+			return 1;
 
 		vmx->nested.nested_run_pending = 1;
 		vmx->nested.smm.guest_mode = false;