diff options
| -rw-r--r-- | drivers/vfio/container.c | 5 | ||||
| -rw-r--r-- | drivers/vfio/vfio.h | 2 | ||||
| -rw-r--r-- | drivers/vfio/vfio_main.c | 29 |
3 files changed, 19 insertions, 17 deletions
diff --git a/drivers/vfio/container.c b/drivers/vfio/container.c index 499777930b08..d97747dfb05d 100644 --- a/drivers/vfio/container.c +++ b/drivers/vfio/container.c @@ -188,8 +188,9 @@ void vfio_device_container_unregister(struct vfio_device *device) device->group->container->iommu_data, device); } -long vfio_container_ioctl_check_extension(struct vfio_container *container, - unsigned long arg) +static long +vfio_container_ioctl_check_extension(struct vfio_container *container, + unsigned long arg) { struct vfio_iommu_driver *driver; long ret = 0; diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h index f95f4925b83b..731561258704 100644 --- a/drivers/vfio/vfio.h +++ b/drivers/vfio/vfio.h @@ -119,8 +119,6 @@ int vfio_container_attach_group(struct vfio_container *container, void vfio_group_detach_container(struct vfio_group *group); void vfio_device_container_register(struct vfio_device *device); void vfio_device_container_unregister(struct vfio_device *device); -long vfio_container_ioctl_check_extension(struct vfio_container *container, - unsigned long arg); int __init vfio_container_init(void); void vfio_container_cleanup(void); diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 8c2dcb481ae1..77d6c0ba6a83 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -1622,24 +1622,27 @@ EXPORT_SYMBOL_GPL(vfio_file_is_group); bool vfio_file_enforced_coherent(struct file *file) { struct vfio_group *group = file->private_data; - bool ret; + struct vfio_device *device; + bool ret = true; if (!vfio_file_is_group(file)) return true; - mutex_lock(&group->group_lock); - if (group->container) { - ret = vfio_container_ioctl_check_extension(group->container, - VFIO_DMA_CC_IOMMU); - } else { - /* - * Since the coherency state is determined only once a container - * is attached the user must do so before they can prove they - * have permission. - */ - ret = true; + /* + * If the device does not have IOMMU_CAP_ENFORCE_CACHE_COHERENCY then + * any domain later attached to it will also not support it. If the cap + * is set then the iommu_domain eventually attached to the device/group + * must use a domain with enforce_cache_coherency(). + */ + mutex_lock(&group->device_lock); + list_for_each_entry(device, &group->device_list, group_next) { + if (!device_iommu_capable(device->dev, + IOMMU_CAP_ENFORCE_CACHE_COHERENCY)) { + ret = false; + break; + } } - mutex_unlock(&group->group_lock); + mutex_unlock(&group->device_lock); return ret; } EXPORT_SYMBOL_GPL(vfio_file_enforced_coherent); |