diff options
Diffstat (limited to 'drivers/vfio/vfio_main.c')
| -rw-r--r-- | drivers/vfio/vfio_main.c | 29 |
1 files changed, 16 insertions, 13 deletions
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); |