Re: [virtio] Groups - Action Item "Create text version of virtio 0.9.5 document" added

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Jul 31, 2013 at 10:58:21AM +0100, Pawel Moll wrote:
> > Link to a discussion?
> 
> http://thread.gmane.org/gmane.linux.kernel.virtualization/20144
> 
> Paweł

Reading through this, you want a way to say "there's no device there"
for virtio-mmio?
I think this is a bus-specific problem.
PCI has a different, standard way to do this (report 0xfffffffff as both
device and vendor ID).

If you want to use subsystem ID for this in virtio-mmio, that's
fine. But I think that we don't need a "do nothing device" for this -
just reserve some IDs (declare them invalid) and bus will then be
able to define behaviour as it sees fit.