[PATCH i-g-t 3/4] tests/intel/xe_sriov_vfio: Add open-basic subtest

Marcin Bernatowicz
2026-03-18T16:15:19Z

The subtest binds a VF to xe-vfio-pci, opens its VFIO group, and
verifies basic VFIO access with a minimal group status query. This
provides a simple smoke test for VFIO device setup.

Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
Cc: Adam Miszczak <adam.miszczak@linux.intel.com>
Cc: Jakub Kolakowski <jakub1.kolakowski@intel.com>
Cc: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Cc: Lukasz Laguna <lukasz.laguna@intel.com>
---
tests/intel/xe_sriov_vfio.c | 136 ++++++++++++++++++++++++++++++++++++
1 file changed, 136 insertions(+)

diff --git a/tests/intel/xe_sriov_vfio.c b/tests/intel/xe_sriov_vfio.c
index a2b2959e2..6a5cc536b 100644
--- a/tests/intel/xe_sriov_vfio.c
+++ b/tests/intel/xe_sriov_vfio.c
@@ -6,6 +6,8 @@
#include <ctype.h>
#include <dirent.h>
#include <fcntl.h>
+#include <linux/vfio.h>
+#include <sys/ioctl.h>

#include "drmtest.h"
#include "igt_core.h"
@@ -29,6 +31,9 @@
*
* SUBTEST: bind-unbind-vfs
* Description: Enable VFs and bind/unbind each one to xe-vfio-pci via driver_override.
+ *
+ * SUBTEST: open-basic
+ * Description: Bind VF to xe-vfio-pci and perform minimal VFIO group open and status ioctl.
*/

IGT_TEST_DESCRIPTION("Xe SR-IOV VFIO tests (xe-vfio-pci)");
@@ -199,6 +204,109 @@ static void restore_xe_vfio_module(void)
restore_xe_vfio_on_exit = false;
}

+static bool vf_iommu_group_id_alloc(const char *pci_slot, char **out_group_id)
+{
+ char path[PATH_MAX];
+ char link[PATH_MAX];
+ ssize_t len;
+ const char *base;
+
+ igt_assert(out_group_id);
+ *out_group_id = NULL;
+
+ snprintf(path, sizeof(path), "/sys/bus/pci/devices/%s/iommu_group", pci_slot);
+ len = readlink(path, link, sizeof(link) - 1);
+ if (len < 0)
+ return false;
+
+ link[len] = '\0';
+ base = strrchr(link, '/');
+ if (!base || !base[1])
+ return false;
+
+ *out_group_id = strdup(base + 1);
+ igt_assert(*out_group_id);
+
+ return true;
+}
+
+struct vfio_dev_fds {
+ int container_fd;
+ int group_fd;
+ int device_fd;
+ char *group_id;
+};
+
+static void vfio_open_group(const char *pci_slot, struct vfio_dev_fds *out,
+ struct vfio_group_status *out_group_status)
+{
+ char group_path[PATH_MAX];
+ int ret;
+
+ igt_assert(out);
+ *out = (struct vfio_dev_fds){
+ .container_fd = -1,
+ .group_fd = -1,
+ .device_fd = -1,
+ .group_id = NULL,
+ };
+
+ if (out_group_status)
+ *out_group_status = (struct vfio_group_status){
+ .argsz = sizeof(*out_group_status)
+ };
+
+ if (!vf_iommu_group_id_alloc(pci_slot, &out->group_id))
+ igt_skip("No IOMMU group (IOMMU disabled or not exposed)\n");
+
+ out->container_fd = open("/dev/vfio/vfio", O_RDWR | O_CLOEXEC);
+ if (out->container_fd < 0)
+ igt_skip("/dev/vfio/vfio not available\n");
+
+ snprintf(group_path, sizeof(group_path), "/dev/vfio/%s", out->group_id);
+ out->group_fd = open(group_path, O_RDWR | O_CLOEXEC);
+ igt_require_f(out->group_fd >= 0, "Failed to open %s (%d)\n", group_path, -errno);
+
+ if (out_group_status) {
+ ret = ioctl(out->group_fd, VFIO_GROUP_GET_STATUS, out_group_status);
+ igt_require_f(ret == 0, "VFIO_GROUP_GET_STATUS failed (%d)\n", -errno);
+ }
+}
+
+static void vfio_close_device(struct vfio_dev_fds *fds)
+{
+ if (!fds)
+ return;
+
+ if (fds->device_fd >= 0)
+ close(fds->device_fd);
+
+ if (fds->group_fd >= 0 && fds->container_fd >= 0)
+ ioctl(fds->group_fd, VFIO_GROUP_UNSET_CONTAINER, &fds->container_fd);
+
+ if (fds->group_fd >= 0)
+ close(fds->group_fd);
+ if (fds->container_fd >= 0)
+ close(fds->container_fd);
+
+ free(fds->group_id);
+
+ fds->container_fd = -1;
+ fds->group_fd = -1;
+ fds->device_fd = -1;
+ fds->group_id = NULL;
+}
+
+static void vfio_open_basic(const char *pci_slot)
+{
+ struct vfio_dev_fds fds;
+ struct vfio_group_status group_status;
+
+ vfio_open_group(pci_slot, &fds, &group_status);
+ igt_info("VFIO group %s status flags=0x%x\n", fds.group_id, group_status.flags);
+ vfio_close_device(&fds);
+}
+
int igt_main()
{
igt_fixture() {
@@ -250,6 +358,34 @@ int igt_main()
}
}

+ igt_describe("Bind VF to xe-vfio-pci and do minimal VFIO open and GET_STATUS.");
+ igt_subtest("open-basic") {
+ char *slot = NULL;
+
+ igt_skip_on_f(igt_kmod_load(XE_VFIO_PCI_MOD, NULL),
+ "Failed to load %s\n", XE_VFIO_PCI_MOD);
+ restore_xe_vfio_on_exit = true;
+
+ open_pf();
+
+ igt_sriov_disable_driver_autoprobe(pf_fd);
+ igt_sriov_enable_vfs(pf_fd, 1);
+
+ igt_require_f(!igt_pci_system_reinit(), "Failed to refresh PCI state\n");
+ igt_sriov_enable_driver_autoprobe(pf_fd);
+
+ slot = vf_pci_slot_alloc(1);
+
+ vf_unbind_override(1);
+ vf_bind_override(1, XE_VFIO_PCI_DRV);
+
+ vfio_open_basic(slot);
+
+ vf_unbind_override(1);
+ free(slot);
+ igt_sriov_disable_vfs(pf_fd);
+ }
+
igt_fixture() {
cleanup_pf();
restore_xe_vfio_module();
--
2.43.0