diff options
Diffstat (limited to 'drivers/vfio/vfio_main.c')
-rw-r--r-- | drivers/vfio/vfio_main.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index ba1d84afe081..902f06e52c48 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -292,6 +292,17 @@ static int __vfio_register_dev(struct vfio_device *device, if (ret) return ret; + /* + * VFIO always sets IOMMU_CACHE because we offer no way for userspace to + * restore cache coherency. It has to be checked here because it is only + * valid for cases where we are using iommu groups. + */ + if (type == VFIO_IOMMU && !vfio_device_is_noiommu(device) && + !device_iommu_capable(device->dev, IOMMU_CAP_CACHE_COHERENCY)) { + ret = -EINVAL; + goto err_out; + } + ret = vfio_device_add(device); if (ret) goto err_out; |