On 11/22/21 09:49, Xuan Ding wrote:
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
Reviewed-by: Maxime Coquelin <maxime.coque...@redhat.com>
Thanks,
Maxime
