On Tue, 14 Aug 2012 13:03:34 +0200, Cornelia Huck <cornelia.h...@de.ibm.com> wrote: > > It would be per-machine; per-device would be a bit crazy. We'd > > deprecate the old ring format. > > > > There's been no consistent thread on the ideas for a ring change, > > unfortunately, but you can find interesting parts here, off this thread: > > > > Message-ID: <8762gj6q5r....@rustcorp.com.au> > > Subject: Re: [RFC 7/11] virtio_pci: new, capability-aware driver. > > I've read a bit through this and it looks like this is really virtio-2 > or so. How about discoverability by the guest? Guests will likely have > to support both formats, and forcing them to look at the feature bits > for each device in order to figure out the queue format feels wrong if > it is going to be the same format for the whole machine anyway.
Yes, it needs some out-of-band acknowledgement mechanism by the guest. Might be worth putting a max version number somewhere, which the guest writes to acknowledge (ie. currently it would be 1, and the guest would always write a 1). Cheers, Rusty.
