Arnd Bergmann wrote:
As I pointed out earlier, most code in virtio net is asymmetrical: guest
provides buffers, host consumes them. Possibly, one could use virtio
rings in a symmetrical way, but support of existing guest virtio net
means there's almost no shared code.
The trick is to swap the virtqueues instead. virtio-net is actually
mostly symmetric in just the same way that the physical wires on a
twisted pair ethernet are symmetric (I like how that analogy fits).
It's already been done between two guests. See
http://article.gmane.org/gmane.linux.kernel.virtualization/5423
Regards,
Anthony Liguori
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