On 25/09/19 12:50, David Hildenbrand wrote: > Can't tell if there might be extensions (if virtio-mem ever comes to > life ;) ) that might make use of asynchronous communication. Especially, > there might be asynchronous/multiple guest->host requests at some point > (e.g., "I'm nearly out of memory, please send help"). Okay, this makes sense. I'm almost sold on it. :) Config space also makes sense, though what you really need is the config space interrupt, rather than config space per se. Paolo > So yes, currently we could live without the ring buffer. But the config > space and the virtqueue are real life-savers for me right now :)