On Sun, 2018-08-05 at 03:09 +0300, Michael S. Tsirkin wrote:

It seems that the fact that within guest it's implemented using a bounce
buffer and that it's easiest to do by switching virtio to use the DMA API
isn't something virtio spec concerns itself with.

Right, this is my reasoning as well. See this other (long) email I just
sent to Christoph to explain the whole flow.

I'm open to suggestions.

Cheers,
Ben.