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doc: update recommended IOVA mode for async vhost

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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>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Xuan Ding 2021-11-22 08:49:48 +00:00 committed by Maxime Coquelin
parent a5e579f4b4
commit 38e0f108c4
1 changed files with 9 additions and 0 deletions
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9
doc/guides/prog_guide/vhost_lib.rst
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@ -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.