Re: [virtio-comment] [PATCH v1 1/8] admin: Add theory of operation for device migration

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

On Wed, Nov 22, 2023 at 12:13:34PM +0800, Jason Wang wrote:
> > > What's wrong if we just allow them to be R/W over adminq/cmmands?
> > >
> > As explained before,
> > Each guest has its own dedicated non mediated interface as defined in virtio spec to not involve hypervisor.
> 
> So what's wrong with inventing per VF queue to do that? For example
> transport virtqueue.

Nothing is wrong with this.

But what is problematic is just re-using config space for migration because
it means we can not just say "don't access device after it is stopped"
because yes you need to access it to save/restore state.
And a new interface over admin cmds just for this side-steps the
issue nicely.

-- 
MST