Merge tag 'vfio-v5.4-rc1' of git://github.com/awilliam/linux-vfio

Pull VFIO updates from Alex Williamson:

 - Fix spapr iommu error case case (Alexey Kardashevskiy)

 - Consolidate region type definitions (Cornelia Huck)

 - Restore saved original PCI state on release (hexin)

 - Simplify mtty sample driver interrupt path (Parav Pandit)

 - Support for reporting valid IOVA regions to user (Shameer Kolothum)

* tag 'vfio-v5.4-rc1' of git://github.com/awilliam/linux-vfio:
  vfio_pci: Restore original state on release
  vfio/type1: remove duplicate retrieval of reserved regions
  vfio/type1: Add IOVA range capability support
  vfio/type1: check dma map request is within a valid iova range
  vfio/spapr_tce: Fix incorrect tce_iommu_group memory free
  vfio-mdev/mtty: Simplify interrupt generation
  vfio: re-arrange vfio region definitions
  vfio/type1: Update iova list on detach
  vfio/type1: Check reserved region conflict and update iova list
  vfio/type1: Introduce iova list and add iommu aperture validity check

drivers/vfio/pci/vfio_pci.c

@@ -438,11 +438,20 @@ static void vfio_pci_disable(struct vfio_pci_device *vdev)
 	pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
 
 	/*
-	 * Try to reset the device.  The success of this is dependent on
-	 * being able to lock the device, which is not always possible.
+	 * Try to get the locks ourselves to prevent a deadlock. The
+	 * success of this is dependent on being able to lock the device,
+	 * which is not always possible.
+	 * We can not use the "try" reset interface here, which will
+	 * overwrite the previously restored configuration information.
 	 */
-	if (vdev->reset_works && !pci_try_reset_function(pdev))
-		vdev->needs_reset = false;
+	if (vdev->reset_works && pci_cfg_access_trylock(pdev)) {
+		if (device_trylock(&pdev->dev)) {
+			if (!__pci_reset_function_locked(pdev))
+				vdev->needs_reset = false;
+			device_unlock(&pdev->dev);
+		}
+		pci_cfg_access_unlock(pdev);
+	}
 
 	pci_restore_state(pdev);
 out:

drivers/vfio/vfio_iommu_spapr_tce.c

@@ -1240,7 +1240,7 @@ static long tce_iommu_take_ownership_ddw(struct tce_container *container,
 static int tce_iommu_attach_group(void *iommu_data,
 		struct iommu_group *iommu_group)
 {
-	int ret;
+	int ret = 0;
 	struct tce_container *container = iommu_data;
 	struct iommu_table_group *table_group;
 	struct tce_iommu_group *tcegrp = NULL;
@@ -1293,13 +1293,13 @@ static int tce_iommu_attach_group(void *iommu_data,
 			!table_group->ops->release_ownership) {
 		if (container->v2) {
 			ret = -EPERM;
-			goto unlock_exit;
+			goto free_exit;
 		}
 		ret = tce_iommu_take_ownership(container, table_group);
 	} else {
 		if (!container->v2) {
 			ret = -EPERM;
-			goto unlock_exit;
+			goto free_exit;
 		}
 		ret = tce_iommu_take_ownership_ddw(container, table_group);
 		if (!tce_groups_attached(container) && !container->tables[0])
@@ -1311,10 +1311,11 @@ static int tce_iommu_attach_group(void *iommu_data,
 		list_add(&tcegrp->next, &container->group_list);
 	}
 
-unlock_exit:
+free_exit:
 	if (ret && tcegrp)
 		kfree(tcegrp);
 
+unlock_exit:
 	mutex_unlock(&container->lock);
 
 	return ret;