diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/vfio/vfio.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index a4555014bd1e..9edad767cfda 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -815,6 +815,13 @@ static int __vfio_register_dev(struct vfio_device *device, int vfio_register_group_dev(struct vfio_device *device) { + /* + * VFIO always sets IOMMU_CACHE because we offer no way for userspace to + * restore cache coherency. + */ + if (!iommu_capable(device->dev->bus, IOMMU_CAP_CACHE_COHERENCY)) + return -EINVAL; + return __vfio_register_dev(device, vfio_group_find_or_alloc(device->dev)); } |