DPDK 21.11 adds vfio support for DMA device in vhost. This patch updates recommended IOVA mode in async datapath.
Signed-off-by: Xuan Ding <xuan.d...@intel.com> --- doc/guides/prog_guide/vhost_lib.rst | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/doc/guides/prog_guide/vhost_lib.rst b/doc/guides/prog_guide/vhost_lib.rst index 76f5d303c9..f72ce75909 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. \ No newline at end of file -- 2.17.1
