iommufd/selftest: Add coverage for vdevice tombstone

This tests the flow to tombstone vdevice when idevice is to be unbound
before vdevice destruction. The expected results of the tombstone are:

 - The vdevice ID can't be reused anymore (not tested in this patch).
 - Even ioctl(IOMMU_DESTROY) can't free the vdevice ID.
 - iommufd_fops_release() can still free everything.

Link: https://patch.msgid.link/r/20250716070349.1807226-8-yilun.xu@linux.intel.com
Reviewed-by: Nicolin Chen <nicolinc@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>

diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index d16fd9928b31fe2ccd49612026a2439e379cc907..4de9ce06669216ba0f853d5eed1f05e21fce8d13 100644 (file)
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -3142,6 +3142,20 @@ TEST_F(iommufd_viommu, hw_queue)
        test_ioctl_ioas_unmap(iova, PAGE_SIZE);
 }
 
+TEST_F(iommufd_viommu, vdevice_tombstone)
+{
+       uint32_t viommu_id = self->viommu_id;
+       uint32_t dev_id = self->device_id;
+       uint32_t vdev_id = 0;
+
+       if (!dev_id)
+               SKIP(return, "Skipping test for variant no_viommu");
+
+       test_cmd_vdevice_alloc(viommu_id, dev_id, 0x99, &vdev_id);
+       test_ioctl_destroy(self->stdev_id);
+       EXPECT_ERRNO(ENOENT, _test_ioctl_destroy(self->fd, vdev_id));
+}
+
 FIXTURE(iommufd_device_pasid)
 {
        int fd;