KVM: selftests: Move KVM_CREATE_DEVICE_TEST code to separate helper

Move KVM_CREATE_DEVICE_TEST to its own helper, identifying "real" versus
"test" device creation based on a hardcoded boolean buried in the middle
of a param list is painful for readers.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/aarch64/vgic_init.c

@@ -649,24 +649,24 @@ int test_kvm_device(uint32_t gic_dev_type)
 	v.vm = vm_create_default_with_vcpus(NR_VCPUS, 0, 0, guest_code, NULL);
 
 	/* try to create a non existing KVM device */
-	ret = _kvm_create_device(v.vm, 0, true, &fd);
+	ret = __kvm_test_create_device(v.vm, 0);
 	TEST_ASSERT(ret && errno == ENODEV, "unsupported device");
 
 	/* trial mode */
-	ret = _kvm_create_device(v.vm, gic_dev_type, true, &fd);
+	ret = __kvm_test_create_device(v.vm, gic_dev_type);
 	if (ret)
 		return ret;
 	v.gic_fd = kvm_create_device(v.vm, gic_dev_type);
 
-	ret = _kvm_create_device(v.vm, gic_dev_type, false, &fd);
+	ret = __kvm_create_device(v.vm, gic_dev_type, &fd);
 	TEST_ASSERT(ret && errno == EEXIST, "create GIC device twice");
 
 	/* try to create the other gic_dev_type */
 	other = VGIC_DEV_IS_V2(gic_dev_type) ? KVM_DEV_TYPE_ARM_VGIC_V3
 					     : KVM_DEV_TYPE_ARM_VGIC_V2;
 
-	if (!_kvm_create_device(v.vm, other, true, &fd)) {
-		ret = _kvm_create_device(v.vm, other, false, &fd);
+	if (!__kvm_test_create_device(v.vm, other)) {
+		ret = __kvm_test_create_device(v.vm, other);
 		TEST_ASSERT(ret && errno == EINVAL,
 				"create GIC device while other version exists");
 	}

tools/testing/selftests/kvm/include/kvm_util_base.h

@@ -484,7 +484,8 @@ void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...);
 
 int _kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr);
 int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr);
-int _kvm_create_device(struct kvm_vm *vm, uint64_t type, bool test, int *fd);
+int __kvm_test_create_device(struct kvm_vm *vm, uint64_t type);
+int __kvm_create_device(struct kvm_vm *vm, uint64_t type, int *fd);
 int kvm_create_device(struct kvm_vm *vm, uint64_t type);
 int _kvm_device_access(int dev_fd, uint32_t group, uint64_t attr,
 		       void *val, bool write);

tools/testing/selftests/kvm/lib/aarch64/vgic.c

@@ -51,8 +51,7 @@ int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, uint32_t nr_irqs,
 			nr_vcpus, nr_vcpus_created);
 
 	/* Distributor setup */
-	if (_kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3,
-			       false, &gic_fd) != 0)
+	if (__kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, &gic_fd))
 		return -1;
 
 	kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS,

tools/testing/selftests/kvm/lib/kvm_util.c

@@ -1629,14 +1629,25 @@ int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr)
 	return ret;
 }
 
-int _kvm_create_device(struct kvm_vm *vm, uint64_t type, bool test, int *fd)
+int __kvm_test_create_device(struct kvm_vm *vm, uint64_t type)
 {
-	struct kvm_create_device create_dev;
+	struct kvm_create_device create_dev = {
+		.type = type,
+		.flags = KVM_CREATE_DEVICE_TEST,
+	};
+
+	return __vm_ioctl(vm, KVM_CREATE_DEVICE, &create_dev);
+}
+
+int __kvm_create_device(struct kvm_vm *vm, uint64_t type, int *fd)
+{
+	struct kvm_create_device create_dev = {
+		.type = type,
+		.fd = -1,
+		.flags = 0,
+	};
 	int ret;
 
-	create_dev.type = type;
-	create_dev.fd = -1;
-	create_dev.flags = test ? KVM_CREATE_DEVICE_TEST : 0;
 	ret = __vm_ioctl(vm, KVM_CREATE_DEVICE, &create_dev);
 	*fd = create_dev.fd;
 	return ret;
@@ -1646,7 +1657,7 @@ int kvm_create_device(struct kvm_vm *vm, uint64_t type)
 {
 	int fd, ret;
 
-	ret = _kvm_create_device(vm, type, false, &fd);
+	ret = __kvm_create_device(vm, type, &fd);
 
 	TEST_ASSERT(!ret, "KVM_CREATE_DEVICE IOCTL failed, rc: %i errno: %i", ret, errno);
 	return fd;