iommufd/viommu: Roll back to use iommufd_object_alloc() for vdevice

To solve the vdevice lifecycle issue, future patches make the vdevice
allocation protected by lock. That will make
_iommufd_object_alloc_ucmd() not applicable for vdevice. Roll back to
use _iommufd_object_alloc() for preparation.

Link: https://patch.msgid.link/r/20250716070349.1807226-2-yilun.xu@linux.intel.com
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: Xu Yilun

drivers/iommu/iommufd/viommu.c

@@ -167,8 +167,8 @@ int iommufd_vdevice_alloc_ioctl(struct iommufd_ucmd *ucmd)
 		vdev_size = viommu->ops->vdevice_size;
 	}
 
-	vdev = (struct iommufd_vdevice *)_iommufd_object_alloc_ucmd(
-		ucmd, vdev_size, IOMMUFD_OBJ_VDEVICE);
+	vdev = (struct iommufd_vdevice *)_iommufd_object_alloc(
+		ucmd->ictx, vdev_size, IOMMUFD_OBJ_VDEVICE);
 	if (IS_ERR(vdev)) {
 		rc = PTR_ERR(vdev);
 		goto out_put_idev;
@@ -183,18 +183,24 @@ int iommufd_vdevice_alloc_ioctl(struct iommufd_ucmd *ucmd)
 	curr = xa_cmpxchg(&viommu->vdevs, virt_id, NULL, vdev, GFP_KERNEL);
 	if (curr) {
 		rc = xa_err(curr) ?: -EEXIST;
-		goto out_put_idev;
+		goto out_abort;
 	}
 
 	if (viommu->ops && viommu->ops->vdevice_init) {
 		rc = viommu->ops->vdevice_init(vdev);
 		if (rc)
-			goto out_put_idev;
+			goto out_abort;
 	}
 
 	cmd->out_vdevice_id = vdev->obj.id;
 	rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd));
+	if (rc)
+		goto out_abort;
+	iommufd_object_finalize(ucmd->ictx, &vdev->obj);
+	goto out_put_idev;
 
+out_abort:
+	iommufd_object_abort_and_destroy(ucmd->ictx, &vdev->obj);
 out_put_idev:
 	iommufd_put_object(ucmd->ictx, &idev->obj);
 out_put_viommu: