[PATCH v4 4/5] iommufd/selftest: Add coverage for access->ioas replacement

[Nicolin Chen]

Add replace coverage as a part of user_copy test case. It basically
repeats the copy test after replacing the old ioas with a new one.

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
 tools/testing/selftests/iommu/iommufd.c | 29 +++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index c07252dbf62d..5c33b6b52c65 100644
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -1252,7 +1252,13 @@ TEST_F(iommufd_mock_domain, user_copy)
 		.dst_iova = MOCK_APERTURE_START,
 		.length = BUFFER_SIZE,
 	};
-	unsigned int ioas_id;
+	struct iommu_ioas_unmap unmap_cmd = {
+		.size = sizeof(unmap_cmd),
+		.ioas_id = self->ioas_id,
+		.iova = MOCK_APERTURE_START,
+		.length = BUFFER_SIZE,
+	};
+	unsigned int new_ioas_id, ioas_id;
 
 	/* Pin the pages in an IOAS with no domains then copy to an IOAS with domains */
 	test_ioctl_ioas_alloc(&ioas_id);
@@ -1270,11 +1276,30 @@ TEST_F(iommufd_mock_domain, user_copy)
 	ASSERT_EQ(0, ioctl(self->fd, IOMMU_IOAS_COPY, &copy_cmd));
 	check_mock_iova(buffer, MOCK_APERTURE_START, BUFFER_SIZE);
 
+	/* Now replace the ioas with a new one */
+	test_ioctl_ioas_alloc(&new_ioas_id);
+	test_ioctl_ioas_map_id(new_ioas_id, buffer, BUFFER_SIZE,
+			       &copy_cmd.src_iova);
+	test_cmd_access_set_ioas(access_cmd.id, new_ioas_id);
+
+	/* Destroy the old ioas and cleanup copied mapping */
+	ASSERT_EQ(0, ioctl(self->fd, IOMMU_IOAS_UNMAP, &unmap_cmd));
+	test_ioctl_destroy(ioas_id);
+
+	/* Then run the same test again with the new ioas */
+	access_cmd.access_pages.iova = copy_cmd.src_iova;
+	ASSERT_EQ(0,
+		  ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_PAGES),
+			&access_cmd));
+	copy_cmd.src_ioas_id = new_ioas_id;
+	ASSERT_EQ(0, ioctl(self->fd, IOMMU_IOAS_COPY, &copy_cmd));
+	check_mock_iova(buffer, MOCK_APERTURE_START, BUFFER_SIZE);
+
 	test_cmd_destroy_access_pages(
 		access_cmd.id, access_cmd.access_pages.out_access_pages_id);
 	test_cmd_destroy_access(access_cmd.id);
 
-	test_ioctl_destroy(ioas_id);
+	test_ioctl_destroy(new_ioas_id);
 }
 
 TEST_F(iommufd_mock_domain, replace)
-- 
2.39.2