On Thu, Dec 06, 2012 at 01:33:58PM +0200, Michael S. Tsirkin wrote: > On Wed, Dec 05, 2012 at 09:47:09PM +0100, Stefan Hajnoczi wrote: > > virtio-blk-data-plane is a subset implementation of virtio-blk. > > I already asked this: > > what confuses me a bit is how, being a subset, it exposes the > same feature bits. For example wce config is ineffective, right? > So I think it should not expose WCE feature bit.
It works like vhost - the virtio negotiation and setup is still handled by QEMU but the actual vring processing is done by dataplane. virtio-blk-data-plane works with cache=none. You're right that WCE should not be toggled because we don't automatically flush after every request. Stefan
