struct rw_semaphore group_lock;
struct vfio_iommu_driver *iommu_driver;
void *iommu_data;
+ bool noiommu;
};
struct vfio_unbound_dev {
struct list_head unbound_list;
struct mutex unbound_lock;
atomic_t opened;
+ bool noiommu;
};
struct vfio_device {
void *device_data;
};
+#ifdef CONFIG_VFIO_NOIOMMU
+static bool noiommu __read_mostly;
+module_param_named(enable_unsafe_noiommu_support,
+ noiommu, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(enable_unsafe_noiommu_mode, "Enable UNSAFE, no-IOMMU mode. This mode provides no device isolation, no DMA translation, no host kernel protection, cannot be used for device assignment to virtual machines, requires RAWIO permissions, and will taint the kernel. If you do not know what this is for, step away. (default: false)");
+#endif
+
+/*
+ * vfio_iommu_group_{get,put} are only intended for VFIO bus driver probe
+ * and remove functions, any use cases other than acquiring the first
+ * reference for the purpose of calling vfio_add_group_dev() or removing
+ * that symmetric reference after vfio_del_group_dev() should use the raw
+ * iommu_group_{get,put} functions. In particular, vfio_iommu_group_put()
+ * removes the device from the dummy group and cannot be nested.
+ */
+struct iommu_group *vfio_iommu_group_get(struct device *dev)
+{
+ struct iommu_group *group;
+ int __maybe_unused ret;
+
+ group = iommu_group_get(dev);
+
+#ifdef CONFIG_VFIO_NOIOMMU
+ /*
+ * With noiommu enabled, an IOMMU group will be created for a device
+ * that doesn't already have one and doesn't have an iommu_ops on their
+ * bus. We use iommu_present() again in the main code to detect these
+ * fake groups.
+ */
+ if (group || !noiommu || iommu_present(dev->bus))
+ return group;
+
+ group = iommu_group_alloc();
+ if (IS_ERR(group))
+ return NULL;
+
+ iommu_group_set_name(group, "vfio-noiommu");
+ ret = iommu_group_add_device(group, dev);
+ iommu_group_put(group);
+ if (ret)
+ return NULL;
+
+ /*
+ * Where to taint? At this point we've added an IOMMU group for a
+ * device that is not backed by iommu_ops, therefore any iommu_
+ * callback using iommu_ops can legitimately Oops. So, while we may
+ * be about to give a DMA capable device to a user without IOMMU
+ * protection, which is clearly taint-worthy, let's go ahead and do
+ * it here.
+ */
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+ dev_warn(dev, "Adding kernel taint for vfio-noiommu group on device\n");
+#endif
+
+ return group;
+}
+EXPORT_SYMBOL_GPL(vfio_iommu_group_get);
+
+void vfio_iommu_group_put(struct iommu_group *group, struct device *dev)
+{
+#ifdef CONFIG_VFIO_NOIOMMU
+ if (!iommu_present(dev->bus))
+ iommu_group_remove_device(dev);
+#endif
+
+ iommu_group_put(group);
+}
+EXPORT_SYMBOL_GPL(vfio_iommu_group_put);
+
+#ifdef CONFIG_VFIO_NOIOMMU
+static void *vfio_noiommu_open(unsigned long arg)
+{
+ if (arg != VFIO_NOIOMMU_IOMMU)
+ return ERR_PTR(-EINVAL);
+ if (!capable(CAP_SYS_RAWIO))
+ return ERR_PTR(-EPERM);
+
+ return NULL;
+}
+
+static void vfio_noiommu_release(void *iommu_data)
+{
+}
+
+static long vfio_noiommu_ioctl(void *iommu_data,
+ unsigned int cmd, unsigned long arg)
+{
+ if (cmd == VFIO_CHECK_EXTENSION)
+ return arg == VFIO_NOIOMMU_IOMMU ? 1 : 0;
+
+ return -ENOTTY;
+}
+
+static int vfio_iommu_present(struct device *dev, void *unused)
+{
+ return iommu_present(dev->bus) ? 1 : 0;
+}
+
+static int vfio_noiommu_attach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+ return iommu_group_for_each_dev(iommu_group, NULL,
+ vfio_iommu_present) ? -EINVAL : 0;
+}
+
+static void vfio_noiommu_detach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+}
+
+static struct vfio_iommu_driver_ops vfio_noiommu_ops = {
+ .name = "vfio-noiommu",
+ .owner = THIS_MODULE,
+ .open = vfio_noiommu_open,
+ .release = vfio_noiommu_release,
+ .ioctl = vfio_noiommu_ioctl,
+ .attach_group = vfio_noiommu_attach_group,
+ .detach_group = vfio_noiommu_detach_group,
+};
+
+static struct vfio_iommu_driver vfio_noiommu_driver = {
+ .ops = &vfio_noiommu_ops,
+};
+
+/*
+ * Wrap IOMMU drivers, the noiommu driver is the one and only driver for
+ * noiommu groups (and thus containers) and not available for normal groups.
+ */
+#define vfio_for_each_iommu_driver(con, pos) \
+ for (pos = con->noiommu ? &vfio_noiommu_driver : \
+ list_first_entry(&vfio.iommu_drivers_list, \
+ struct vfio_iommu_driver, vfio_next); \
+ (con->noiommu ? pos != NULL : \
+ &pos->vfio_next != &vfio.iommu_drivers_list); \
+ pos = con->noiommu ? NULL : list_next_entry(pos, vfio_next))
+#else
+#define vfio_for_each_iommu_driver(con, pos) \
+ list_for_each_entry(pos, &vfio.iommu_drivers_list, vfio_next)
+#endif
+
+
/**
* IOMMU driver registration
*/
/**
* Group objects - create, release, get, put, search
*/
-static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group)
+static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group,
+ bool noiommu)
{
struct vfio_group *group, *tmp;
struct device *dev;
atomic_set(&group->container_users, 0);
atomic_set(&group->opened, 0);
group->iommu_group = iommu_group;
+ group->noiommu = noiommu;
group->nb.notifier_call = vfio_iommu_group_notifier;
dev = device_create(vfio.class, NULL,
MKDEV(MAJOR(vfio.group_devt), minor),
- group, "%d", iommu_group_id(iommu_group));
+ group, "%s%d", noiommu ? "noiommu-" : "",
+ iommu_group_id(iommu_group));
if (IS_ERR(dev)) {
vfio_free_group_minor(minor);
vfio_group_unlock_and_free(group);
group = vfio_group_get_from_iommu(iommu_group);
if (!group) {
- group = vfio_create_group(iommu_group);
+ group = vfio_create_group(iommu_group,
+ !iommu_present(dev->bus));
if (IS_ERR(group)) {
iommu_group_put(iommu_group);
return PTR_ERR(group);
*/
if (!driver) {
mutex_lock(&vfio.iommu_drivers_lock);
- list_for_each_entry(driver, &vfio.iommu_drivers_list,
- vfio_next) {
+ vfio_for_each_iommu_driver(container, driver) {
if (!try_module_get(driver->ops->owner))
continue;
}
mutex_lock(&vfio.iommu_drivers_lock);
- list_for_each_entry(driver, &vfio.iommu_drivers_list, vfio_next) {
+ vfio_for_each_iommu_driver(container, driver) {
void *data;
if (!try_module_get(driver->ops->owner))
if (atomic_read(&group->container_users))
return -EINVAL;
+ if (group->noiommu && !capable(CAP_SYS_RAWIO))
+ return -EPERM;
+
f = fdget(container_fd);
if (!f.file)
return -EBADF;
down_write(&container->group_lock);
+ /* Real groups and fake groups cannot mix */
+ if (!list_empty(&container->group_list) &&
+ container->noiommu != group->noiommu) {
+ ret = -EPERM;
+ goto unlock_out;
+ }
+
driver = container->iommu_driver;
if (driver) {
ret = driver->ops->attach_group(container->iommu_data,
}
group->container = container;
+ container->noiommu = group->noiommu;
list_add(&group->container_next, &container->group_list);
/* Get a reference on the container and mark a user within the group */
!group->container->iommu_driver || !vfio_group_viable(group))
return -EINVAL;
+ if (group->noiommu && !capable(CAP_SYS_RAWIO))
+ return -EPERM;
+
device = vfio_device_get_from_name(group, buf);
if (!device)
return -ENODEV;
fd_install(ret, filep);
+ if (group->noiommu)
+ dev_warn(device->dev, "vfio-noiommu device opened by user "
+ "(%s:%d)\n", current->comm, task_pid_nr(current));
+
return ret;
}
if (!group)
return -ENODEV;
+ if (group->noiommu && !capable(CAP_SYS_RAWIO)) {
+ vfio_group_put(group);
+ return -EPERM;
+ }
+
/* Do we need multiple instances of the group open? Seems not. */
opened = atomic_cmpxchg(&group->opened, 0, 1);
if (opened) {
if (!atomic_inc_not_zero(&group->container_users))
return ERR_PTR(-EINVAL);
+ if (group->noiommu) {
+ atomic_dec(&group->container_users);
+ return ERR_PTR(-EPERM);
+ }
+
if (!group->container->iommu_driver ||
!vfio_group_viable(group)) {
atomic_dec(&group->container_users);
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff