[PATCH v4 09/16] vfio: selftests: Add vfio_pci_liveupdate_uapi_test

[Vipin Sharma <vipinsh@google.com>]

From: David Matlack <dmatlack@google.com>

Add a selftest to exercise preserving a various VFIO files through
/dev/liveupdate. Ensure that VFIO cdev device files can be preserved and
everything else (group-based device files, group files, and container
files) all fail.

Signed-off-by: David Matlack <dmatlack@google.com>
Signed-off-by: Vipin Sharma <vipinsh@google.com>
---
 tools/testing/selftests/vfio/Makefile         |  1 +
 .../vfio/vfio_pci_liveupdate_uapi_test.c      | 93 +++++++++++++++++++
 2 files changed, 94 insertions(+)
 create mode 100644 tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_test.c

diff --git a/tools/testing/selftests/vfio/Makefile b/tools/testing/selftests/vfio/Makefile
index 7865b2aa011c..df3e44660bd0 100644
--- a/tools/testing/selftests/vfio/Makefile
+++ b/tools/testing/selftests/vfio/Makefile
@@ -12,6 +12,7 @@ TEST_GEN_PROGS += vfio_iommufd_setup_test
 TEST_GEN_PROGS += vfio_pci_device_test
 TEST_GEN_PROGS += vfio_pci_device_init_perf_test
 TEST_GEN_PROGS += vfio_pci_driver_test
+TEST_GEN_PROGS += vfio_pci_liveupdate_uapi_test
 
 TEST_FILES += scripts/cleanup.sh
 TEST_FILES += scripts/lib.sh
diff --git a/tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_test.c b/tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_test.c
new file mode 100644
index 000000000000..1d89b08ab0a4
--- /dev/null
+++ b/tools/testing/selftests/vfio/vfio_pci_liveupdate_uapi_test.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <libliveupdate.h>
+#include <libvfio.h>
+#include <kselftest_harness.h>
+
+static const char *device_bdf;
+
+FIXTURE(vfio_pci_liveupdate_uapi_test) {
+	int luo_fd;
+	int session_fd;
+	struct iommu *iommu;
+	struct vfio_pci_device *device;
+};
+
+FIXTURE_VARIANT(vfio_pci_liveupdate_uapi_test) {
+	const char *iommu_mode;
+};
+
+#define FIXTURE_VARIANT_ADD_IOMMU_MODE(_iommu_mode)			\
+FIXTURE_VARIANT_ADD(vfio_pci_liveupdate_uapi_test, _iommu_mode) {	\
+	.iommu_mode = #_iommu_mode,					\
+}
+
+FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES();
+#undef FIXTURE_VARIANT_ADD_IOMMU_MODE
+
+FIXTURE_SETUP(vfio_pci_liveupdate_uapi_test)
+{
+	self->luo_fd = luo_open_device();
+	ASSERT_GE(self->luo_fd, 0);
+
+	self->session_fd = luo_create_session(self->luo_fd, "session");
+	ASSERT_GE(self->session_fd, 0);
+
+	self->iommu = iommu_init(variant->iommu_mode);
+	self->device = vfio_pci_device_init(device_bdf, self->iommu);
+}
+
+FIXTURE_TEARDOWN(vfio_pci_liveupdate_uapi_test)
+{
+	vfio_pci_device_cleanup(self->device);
+	iommu_cleanup(self->iommu);
+	close(self->session_fd);
+	close(self->luo_fd);
+}
+
+TEST_F(vfio_pci_liveupdate_uapi_test, preserve_device)
+{
+	int ret;
+
+	ret = luo_session_preserve_fd(self->session_fd, self->device->fd, 0);
+
+	/* Preservation should only be supported for VFIO cdev files. */
+	ASSERT_EQ(ret, self->iommu->iommufd ? 0 : -ENOENT);
+}
+
+TEST_F(vfio_pci_liveupdate_uapi_test, preserve_group_fails)
+{
+	int ret;
+
+	if (self->iommu->iommufd)
+		SKIP(return, "iommufd-mode does not have group files");
+
+	ret = luo_session_preserve_fd(self->session_fd, self->device->group_fd, 0);
+	ASSERT_EQ(ret, -ENOENT);
+}
+
+TEST_F(vfio_pci_liveupdate_uapi_test, preserve_container_fails)
+{
+	int ret;
+
+	if (self->iommu->iommufd)
+		SKIP(return, "iommufd-mode does not have container files");
+
+	ret = luo_session_preserve_fd(self->session_fd, self->iommu->container_fd, 0);
+	ASSERT_EQ(ret, -ENOENT);
+}
+
+int main(int argc, char *argv[])
+{
+	int fd;
+
+	fd = luo_open_device();
+	if (fd < 0)
+		ksft_exit_skip("open(%s) failed: %s, skipping\n",
+			       LUO_DEVICE, strerror(errno));
+
+	close(fd);
+
+	device_bdf = vfio_selftests_get_bdf(&argc, argv);
+	return test_harness_run(argc, argv);
+}
-- 
2.54.0.563.g4f69b47b94-goog