diff --git a/doc/guides/prog_guide/vhost_lib.rst b/doc/guides/prog_guide/vhost_lib.rst
index 76f5d303c9..7b93116905 100644
--- a/doc/guides/prog_guide/vhost_lib.rst
+++ b/doc/guides/prog_guide/vhost_lib.rst
@@ -442,3 +442,12 @@ Finally, a set of device ops is defined for device specific operations:
 * ``get_notify_area``
 
   Called to get the notify area info of the queue.
+
+Recommended IOVA mode in async datapath
+---------------------------------------
+
+When DMA devices are bound to VFIO driver, VA mode is recommended.
+For PA mode, page by page mapping may exceed IOMMU's max capability,
+better to use 1G guest hugepage.
+
+For UIO driver, any VFIO related error message can be ignored.