From: Josh Hilke jrhilke@google.com
Add a vfio test suite which verifies that userspace can bind and unbind devices, allocate I/O address space, and attach a device to an IOMMU domain using the cdev + IOMMUfd VFIO interface.
Signed-off-by: Josh Hilke jrhilke@google.com Acked-by: Shuah Khan skhan@linuxfoundation.org Signed-off-by: David Matlack dmatlack@google.com --- tools/testing/selftests/vfio/Makefile | 1 + .../selftests/vfio/vfio_iommufd_setup_test.c | 157 ++++++++++++++++++ 2 files changed, 158 insertions(+) create mode 100644 tools/testing/selftests/vfio/vfio_iommufd_setup_test.c
diff --git a/tools/testing/selftests/vfio/Makefile b/tools/testing/selftests/vfio/Makefile index 828419537250..e4a5d6eadff3 100644 --- a/tools/testing/selftests/vfio/Makefile +++ b/tools/testing/selftests/vfio/Makefile @@ -1,4 +1,5 @@ CFLAGS = $(KHDR_INCLUDES) +TEST_GEN_PROGS += vfio_iommufd_setup_test TEST_GEN_PROGS += vfio_pci_device_test include ../lib.mk include lib/libvfio.mk diff --git a/tools/testing/selftests/vfio/vfio_iommufd_setup_test.c b/tools/testing/selftests/vfio/vfio_iommufd_setup_test.c new file mode 100644 index 000000000000..f45335d9260f --- /dev/null +++ b/tools/testing/selftests/vfio/vfio_iommufd_setup_test.c @@ -0,0 +1,157 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <assert.h> +#include <dirent.h> +#include <fcntl.h> + +#include <uapi/linux/types.h> +#include <linux/limits.h> +#include <linux/sizes.h> +#include <linux/vfio.h> +#include <linux/iommufd.h> + +#include <stdint.h> +#include <stdio.h> +#include <string.h> +#include <sys/ioctl.h> +#include <unistd.h> + +#include <vfio_util.h> +#include "../kselftest_harness.h" + +static const char iommu_dev_path[] = "/dev/iommu"; +static char cdev_path[PATH_MAX] = { '\0' }; + +static void set_cdev_path(const char *bdf) +{ + char dir_path[PATH_MAX]; + DIR *dir; + struct dirent *entry; + + snprintf(dir_path, sizeof(dir_path), "/sys/bus/pci/devices/%s/vfio-dev/", bdf); + + dir = opendir(dir_path); + assert(dir); + + /* Find the file named "vfio<number>" */ + while ((entry = readdir(dir)) != NULL) { + if (!strncmp("vfio", entry->d_name, 4)) { + snprintf(cdev_path, sizeof(cdev_path), "/dev/vfio/devices/%s", + entry->d_name); + break; + } + } + + assert(strlen(cdev_path) > 0); + + closedir(dir); +} + +static int vfio_device_bind_iommufd_ioctl(int cdev_fd, int iommufd) +{ + struct vfio_device_bind_iommufd bind_args = { + .argsz = sizeof(bind_args), + .iommufd = iommufd, + }; + + return ioctl(cdev_fd, VFIO_DEVICE_BIND_IOMMUFD, &bind_args); +} + +static int vfio_device_get_info_ioctl(int cdev_fd) +{ + struct vfio_device_info info_args = { .argsz = sizeof(info_args) }; + + return ioctl(cdev_fd, VFIO_DEVICE_GET_INFO, &info_args); +} + +static int vfio_device_ioas_alloc_ioctl(int iommufd, struct iommu_ioas_alloc *alloc_args) +{ + *alloc_args = (struct iommu_ioas_alloc){ + .size = sizeof(struct iommu_ioas_alloc), + }; + + return ioctl(iommufd, IOMMU_IOAS_ALLOC, alloc_args); +} + +static int vfio_device_attach_iommufd_pt_ioctl(int cdev_fd, u32 pt_id) +{ + struct vfio_device_attach_iommufd_pt attach_args = { + .argsz = sizeof(attach_args), + .pt_id = pt_id, + }; + + return ioctl(cdev_fd, VFIO_DEVICE_ATTACH_IOMMUFD_PT, &attach_args); +} + +static int vfio_device_detach_iommufd_pt_ioctl(int cdev_fd) +{ + struct vfio_device_detach_iommufd_pt detach_args = { + .argsz = sizeof(detach_args), + }; + + return ioctl(cdev_fd, VFIO_DEVICE_DETACH_IOMMUFD_PT, &detach_args); +} + +FIXTURE(vfio_cdev) { + int cdev_fd; + int iommufd; +}; + +FIXTURE_SETUP(vfio_cdev) +{ + ASSERT_LE(0, (self->cdev_fd = open(cdev_path, O_RDWR, 0))); + ASSERT_LE(0, (self->iommufd = open(iommu_dev_path, O_RDWR, 0))); +} + +FIXTURE_TEARDOWN(vfio_cdev) +{ + ASSERT_EQ(0, close(self->cdev_fd)); + ASSERT_EQ(0, close(self->iommufd)); +} + +TEST_F(vfio_cdev, bind) +{ + ASSERT_EQ(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd)); + ASSERT_EQ(0, vfio_device_get_info_ioctl(self->cdev_fd)); +} + +TEST_F(vfio_cdev, get_info_without_bind_fails) +{ + ASSERT_NE(0, vfio_device_get_info_ioctl(self->cdev_fd)); +} + +TEST_F(vfio_cdev, bind_bad_iommufd_fails) +{ + ASSERT_NE(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, -2)); +} + +TEST_F(vfio_cdev, repeated_bind_fails) +{ + ASSERT_EQ(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd)); + ASSERT_NE(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd)); +} + +TEST_F(vfio_cdev, attach_detatch_pt) +{ + struct iommu_ioas_alloc alloc_args; + + ASSERT_EQ(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd)); + ASSERT_EQ(0, vfio_device_ioas_alloc_ioctl(self->iommufd, &alloc_args)); + ASSERT_EQ(0, vfio_device_attach_iommufd_pt_ioctl(self->cdev_fd, alloc_args.out_ioas_id)); + ASSERT_EQ(0, vfio_device_detach_iommufd_pt_ioctl(self->cdev_fd)); +} + +TEST_F(vfio_cdev, attach_invalid_pt_fails) +{ + ASSERT_EQ(0, vfio_device_bind_iommufd_ioctl(self->cdev_fd, self->iommufd)); + ASSERT_NE(0, vfio_device_attach_iommufd_pt_ioctl(self->cdev_fd, UINT32_MAX)); +} + +int main(int argc, char *argv[]) +{ + const char *device_bdf = vfio_selftests_get_bdf(&argc, argv); + + set_cdev_path(device_bdf); + printf("Using cdev device %s\n", cdev_path); + + return test_harness_run(argc, argv); +}