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doc: update recommended IOVA mode for async vhost

Message ID 20211122084948.39382-1-xuan.ding@intel.com (mailing list archive)
State New
Delegated to: Maxime Coquelin
Headers show
Series doc: update recommended IOVA mode for async vhost | expand


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Commit Message

Xuan Ding Nov. 22, 2021, 8:49 a.m. UTC
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.ding@intel.com>
 doc/guides/prog_guide/vhost_lib.rst | 9 +++++++++
 1 file changed, 9 insertions(+)
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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.
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