[PATCH v4 05/18] vfio: selftests: Introduce struct iommu

26 Nov 2025

Introduce struct iommu, which logically represents either a VFIO
container or an iommufd IOAS, depending on which IOMMU mode is used by
the test.
This will be used in a subsequent commit to allow devices to be added to
the same container/iommufd.
Reviewed-by: Alex Mastro amastro@fb.com
Tested-by: Alex Mastro amastro@fb.com
Reviewed-by: Raghavendra Rao Ananta rananta@google.com
Signed-off-by: David Matlack dmatlack@google.com
---
 .../selftests/vfio/lib/include/vfio_util.h    | 16 ++--
 .../selftests/vfio/lib/vfio_pci_device.c      | 75 ++++++++++---------
 2 files changed, 49 insertions(+), 42 deletions(-)

diff --git a/tools/testing/selftests/vfio/lib/include/vfio_util.h b/tools/testing/selftests/vfio/lib/include/vfio_util.h
index 2f5555138d7f..3160f2d1ea6d 100644
--- a/tools/testing/selftests/vfio/lib/include/vfio_util.h
+++ b/tools/testing/selftests/vfio/lib/include/vfio_util.h
@@ -163,15 +163,19 @@ struct vfio_pci_driver {
    int msi;
 };
+struct iommu {
+	const struct iommu_mode *mode;
+	int container_fd;
+	int iommufd;
+	u32 ioas_id;
+	struct list_head dma_regions;
+};
+
 struct vfio_pci_device {
    int fd;
-
-	const struct iommu_mode *iommu_mode;
    int group_fd;
-	int container_fd;
-	int iommufd;
-	u32 ioas_id;
+	struct iommu *iommu;
struct vfio_device_info info;
    struct vfio_region_info config_space;
@@ -180,8 +184,6 @@ struct vfio_pci_device {
    struct vfio_irq_info msi_info;
    struct vfio_irq_info msix_info;
-	struct list_head dma_regions;
-
    /* eventfds for MSI and MSI-x interrupts */
    int msi_eventfds[PCI_MSIX_FLAGS_QSIZE + 1];
diff --git a/tools/testing/selftests/vfio/lib/vfio_pci_device.c b/tools/testing/selftests/vfio/lib/vfio_pci_device.c
index 4a021ff4fc40..e47f3ccf6d49 100644
--- a/tools/testing/selftests/vfio/lib/vfio_pci_device.c
+++ b/tools/testing/selftests/vfio/lib/vfio_pci_device.c
@@ -277,7 +277,7 @@ iova_t __to_iova(struct vfio_pci_device *device, void *vaddr)
 {
    struct vfio_dma_region *region;
-	list_for_each_entry(region, &device->dma_regions, link) {
+	list_for_each_entry(region, &device->iommu->dma_regions, link) {
    	if (vaddr < region->vaddr)
    		continue;
@@ -397,7 +397,7 @@ static int vfio_iommu_dma_map(struct vfio_pci_device *device,
    	.size = region->size,
    };
-	if (ioctl(device->container_fd, VFIO_IOMMU_MAP_DMA, &args))
+	if (ioctl(device->iommu->container_fd, VFIO_IOMMU_MAP_DMA, &args))
    	return -errno;
return 0;
@@ -414,10 +414,10 @@ static int iommufd_dma_map(struct vfio_pci_device *device,
    	.user_va = (u64)region->vaddr,
    	.iova = region->iova,
    	.length = region->size,
-		.ioas_id = device->ioas_id,
+		.ioas_id = device->iommu->ioas_id,
    };
-	if (ioctl(device->iommufd, IOMMU_IOAS_MAP, &args))
+	if (ioctl(device->iommu->iommufd, IOMMU_IOAS_MAP, &args))
    	return -errno;
return 0;
@@ -428,7 +428,7 @@ int __vfio_pci_dma_map(struct vfio_pci_device *device,
 {
    int ret;
-	if (device->iommufd)
+	if (device->iommu->iommufd)
    	ret = iommufd_dma_map(device, region);
    else
    	ret = vfio_iommu_dma_map(device, region);
@@ -436,7 +436,7 @@ int __vfio_pci_dma_map(struct vfio_pci_device *device,
    if (ret)
    	return ret;
-	list_add(&region->link, &device->dma_regions);
+	list_add(&region->link, &device->iommu->dma_regions);
return 0;
 }
@@ -484,13 +484,14 @@ int __vfio_pci_dma_unmap(struct vfio_pci_device *device,
 {
    int ret;
-	if (device->iommufd)
-		ret = iommufd_dma_unmap(device->iommufd, region->iova,
-					region->size, device->ioas_id,
+	if (device->iommu->iommufd)
+		ret = iommufd_dma_unmap(device->iommu->iommufd, region->iova,
+					region->size, device->iommu->ioas_id,
    				unmapped);
    else
-		ret = vfio_iommu_dma_unmap(device->container_fd, region->iova,
-					   region->size, 0, unmapped);
+		ret = vfio_iommu_dma_unmap(device->iommu->container_fd,
+					   region->iova, region->size, 0,
+					   unmapped);
if (ret)
    	return ret;
@@ -505,17 +506,17 @@ int __vfio_pci_dma_unmap_all(struct vfio_pci_device *device, u64 *unmapped)
    int ret;
    struct vfio_dma_region *curr, *next;
-	if (device->iommufd)
-		ret = iommufd_dma_unmap(device->iommufd, 0, UINT64_MAX,
-					device->ioas_id, unmapped);
+	if (device->iommu->iommufd)
+		ret = iommufd_dma_unmap(device->iommu->iommufd, 0, UINT64_MAX,
+					device->iommu->ioas_id, unmapped);
    else
-		ret = vfio_iommu_dma_unmap(device->container_fd, 0, 0,
+		ret = vfio_iommu_dma_unmap(device->iommu->container_fd, 0, 0,
    				   VFIO_DMA_UNMAP_FLAG_ALL, unmapped);
if (ret)
    	return ret;
-	list_for_each_entry_safe(curr, next, &device->dma_regions, link)
+	list_for_each_entry_safe(curr, next, &device->iommu->dma_regions, link)
    	list_del_init(&curr->link);
return 0;
@@ -627,28 +628,28 @@ static void vfio_pci_group_setup(struct vfio_pci_device *device, const char *bdf
    ioctl_assert(device->group_fd, VFIO_GROUP_GET_STATUS, &group_status);
    VFIO_ASSERT_TRUE(group_status.flags & VFIO_GROUP_FLAGS_VIABLE);
-	ioctl_assert(device->group_fd, VFIO_GROUP_SET_CONTAINER, &device->container_fd);
+	ioctl_assert(device->group_fd, VFIO_GROUP_SET_CONTAINER, &device->iommu->container_fd);
 }
static void vfio_pci_container_setup(struct vfio_pci_device *device, const char *bdf)
 {
-	unsigned long iommu_type = device->iommu_mode->iommu_type;
-	const char *path = device->iommu_mode->container_path;
+	unsigned long iommu_type = device->iommu->mode->iommu_type;
+	const char *path = device->iommu->mode->container_path;
    int version;
    int ret;
-	device->container_fd = open(path, O_RDWR);
-	VFIO_ASSERT_GE(device->container_fd, 0, "open(%s) failed\n", path);
+	device->iommu->container_fd = open(path, O_RDWR);
+	VFIO_ASSERT_GE(device->iommu->container_fd, 0, "open(%s) failed\n", path);
-	version = ioctl(device->container_fd, VFIO_GET_API_VERSION);
+	version = ioctl(device->iommu->container_fd, VFIO_GET_API_VERSION);
    VFIO_ASSERT_EQ(version, VFIO_API_VERSION, "Unsupported version: %d\n", version);
vfio_pci_group_setup(device, bdf);
-	ret = ioctl(device->container_fd, VFIO_CHECK_EXTENSION, iommu_type);
+	ret = ioctl(device->iommu->container_fd, VFIO_CHECK_EXTENSION, iommu_type);
    VFIO_ASSERT_GT(ret, 0, "VFIO IOMMU type %lu not supported\n", iommu_type);
-	ioctl_assert(device->container_fd, VFIO_SET_IOMMU, (void *)iommu_type);
+	ioctl_assert(device->iommu->container_fd, VFIO_SET_IOMMU, (void *)iommu_type);
device->fd = ioctl(device->group_fd, VFIO_GROUP_GET_DEVICE_FD, bdf);
    VFIO_ASSERT_GE(device->fd, 0);
@@ -801,12 +802,12 @@ static void vfio_pci_iommufd_setup(struct vfio_pci_device *device, const char *b
     * used to check if iommufd is enabled. In practice open() will never
     * return 0 unless stdin is closed.
     */
-	device->iommufd = open("/dev/iommu", O_RDWR);
-	VFIO_ASSERT_GT(device->iommufd, 0);
+	device->iommu->iommufd = open("/dev/iommu", O_RDWR);
+	VFIO_ASSERT_GT(device->iommu->iommufd, 0);
-	vfio_device_bind_iommufd(device->fd, device->iommufd);
-	device->ioas_id = iommufd_ioas_alloc(device->iommufd);
-	vfio_device_attach_iommufd_pt(device->fd, device->ioas_id);
+	vfio_device_bind_iommufd(device->fd, device->iommu->iommufd);
+	device->iommu->ioas_id = iommufd_ioas_alloc(device->iommu->iommufd);
+	vfio_device_attach_iommufd_pt(device->fd, device->iommu->ioas_id);
 }
struct vfio_pci_device *vfio_pci_device_init(const char *bdf, const char *iommu_mode)
@@ -816,11 +817,14 @@ struct vfio_pci_device *vfio_pci_device_init(const char *bdf, const char *iommu_
    device = calloc(1, sizeof(*device));
    VFIO_ASSERT_NOT_NULL(device);
-	INIT_LIST_HEAD(&device->dma_regions);
+	device->iommu = calloc(1, sizeof(*device->iommu));
+	VFIO_ASSERT_NOT_NULL(device->iommu);
+
+	INIT_LIST_HEAD(&device->iommu->dma_regions);
-	device->iommu_mode = lookup_iommu_mode(iommu_mode);
+	device->iommu->mode = lookup_iommu_mode(iommu_mode);
-	if (device->iommu_mode->container_path)
+	if (device->iommu->mode->container_path)
    	vfio_pci_container_setup(device, bdf);
    else
    	vfio_pci_iommufd_setup(device, bdf);
@@ -849,13 +853,14 @@ void vfio_pci_device_cleanup(struct vfio_pci_device *device)
    	VFIO_ASSERT_EQ(close(device->msi_eventfds[i]), 0);
    }
-	if (device->iommufd) {
-		VFIO_ASSERT_EQ(close(device->iommufd), 0);
+	if (device->iommu->iommufd) {
+		VFIO_ASSERT_EQ(close(device->iommu->iommufd), 0);
    } else {
    	VFIO_ASSERT_EQ(close(device->group_fd), 0);
-		VFIO_ASSERT_EQ(close(device->container_fd), 0);
+		VFIO_ASSERT_EQ(close(device->iommu->container_fd), 0);
    }
+	free(device->iommu);
    free(device);
 }
-- 
2.52.0.487.g5c8c507ade-goog



    

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[PATCH v4 05/18] vfio: selftests: Introduce struct iommu