[Sound-open-firmware] [PATCH v3 5/5] vhost: add an RPMsg API

[Vincent Whitchurch]

On Wed, May 27, 2020 at 08:05:41PM +0200, Guennadi Liakhovetski wrote:
> Linux supports running the RPMsg protocol over the VirtIO transport
> protocol, but currently there is only support for VirtIO clients and
> no support for a VirtIO server. This patch adds a vhost-based RPMsg
> server implementation.

This looks really useful, but why is it implemented as an API and not as
a real vhost driver which implements an rpmsg bus?  If you implement it
as a vhost driver which implements rpmsg_device_ops and
rpmsg_endpoint_ops, then wouldn't you be able to implement your
vhost-sof driver using the normal rpmsg APIs?

I tried quickly hooking up this code to such a vhost driver and I was
able to communicate between host and guest systems with both
rpmsg-client-sample and rpmsg-char which almost no modifications to
those drivers.