Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

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

On Wed, Oct 06, 2021 at 09:28:50AM +0100, Dr. David Alan Gilbert wrote:
> To me it feels the same as the distinction between vhost-kernel and qemu
> backended virtio that we get in net and others - in principal it's just 
> another implementation.

In net it's actually like this. Same -device, a different netdev.

> A tricky part is guaranteeing the set of visible virtio features between
> implementations; we have that problem when we use vhost-kernel and run
> on a newer/older kernel and gain virtio features; the same will be true
> with vhost-user implementations.

That's not new but yes we need to work on this.

> But this would make the structure of a vhost-user implementation quite
> different.
> 
> Dave

Right. That's why I'm reluctant to just add a new device type that
has special compatibility requirements.

> > 
> > > > -- 
> > > > MST
> > > > 
> > > -- 
> > > Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
> > 
> -- 
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK