[PATCH] doc: update recommended IOVA mode for async vhost
Maxime Coquelin
maxime.coquelin at redhat.com
Mon Jan 31 09:41:26 CET 2022
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.ding at 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.coquelin at redhat.com>
Thanks,
Maxime
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