[ovs-dev] [RFC PATCH 2/2] netdev-dpdk: add support for vhost IOMMU feature

[Maxime Coquelin]

Hi Mark,

Thanks for the patch, it looks overall good to me once Ciara comments
taken into account.

I would just add to below note:

On 11/07/2017 04:59 PM, Mark Kavanagh wrote:
> +.. important::
> +
> +    Enabling the IOMMU feature also enables the vhost user reply-ack protocol;
> +    this is known to work on QEMU v2.10.0, but is buggy on older versions
> +    (2.7.0 - 2.9.0, inclusive). Consequently, the IOMMU feaure is disabled by
> +    default (and should remain so if using the aforementioned versions of QEMU)

"Starting Qemu v2.9.1, vhost-iommu-support can safely be enabled, even 
without having an IOMMU device with no performance penalty."

Cheers,
Maxime