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-rw-r--r--include/uapi/linux/iommufd.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 8719d4f5d618..6901804ec736 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -393,6 +393,9 @@ struct iommu_vfio_ioas {
* Any domain attached to the non-PASID part of the
* device must also be flagged, otherwise attaching a
* PASID will blocked.
+ * For the user that wants to attach PASID, ioas is
+ * not recommended for both the non-PASID part
+ * and PASID part of the device.
* If IOMMU does not support PASID it will return
* error (-EOPNOTSUPP).
*/