vfio: factor out a vfio_iommu_driver_allowed helper

Factor out a little helper to make the checks for the noiommu driver less
ugly.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20210924155705.4258-3-hch@lst.deSigned-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/vfio.c

@@ -257,8 +257,23 @@ static const struct vfio_iommu_driver_ops vfio_noiommu_ops = {
 	.attach_group = vfio_noiommu_attach_group,
 	.detach_group = vfio_noiommu_detach_group,
 };
-#endif
 
+/*
+ * Only noiommu containers can use vfio-noiommu and noiommu containers can only
+ * use vfio-noiommu.
+ */
+static inline bool vfio_iommu_driver_allowed(struct vfio_container *container,
+		const struct vfio_iommu_driver *driver)
+{
+	return container->noiommu == (driver->ops == &vfio_noiommu_ops);
+}
+#else
+static inline bool vfio_iommu_driver_allowed(struct vfio_container *container,
+		const struct vfio_iommu_driver *driver)
+{
+	return true;
+}
+#endif /* CONFIG_VFIO_NOIOMMU */
 
 /**
  * IOMMU driver registration
@@ -1034,13 +1049,10 @@ static long vfio_ioctl_check_extension(struct vfio_container *container,
 			list_for_each_entry(driver, &vfio.iommu_drivers_list,
 					    vfio_next) {
 
-#ifdef CONFIG_VFIO_NOIOMMU
 				if (!list_empty(&container->group_list) &&
-				    (container->noiommu !=
-				     (driver->ops == &vfio_noiommu_ops)))
+				    !vfio_iommu_driver_allowed(container,
+							       driver))
 					continue;
-#endif
-
 				if (!try_module_get(driver->ops->owner))
 					continue;
 
@@ -1112,15 +1124,8 @@ static long vfio_ioctl_set_iommu(struct vfio_container *container,
 	list_for_each_entry(driver, &vfio.iommu_drivers_list, vfio_next) {
 		void *data;
 
-#ifdef CONFIG_VFIO_NOIOMMU
-		/*
-		 * Only noiommu containers can use vfio-noiommu and noiommu
-		 * containers can only use vfio-noiommu.
-		 */
-		if (container->noiommu != (driver->ops == &vfio_noiommu_ops))
+		if (!vfio_iommu_driver_allowed(container, driver))
 			continue;
-#endif
-
 		if (!try_module_get(driver->ops->owner))
 			continue;