On Mon, 13 Jul 2015 16:34:30 +0200 Paolo Bonzini <pbonz...@redhat.com> wrote:
> > > On 13/07/2015 15:20, Cornelia Huck wrote: > > This would imply that any transitional device cannot offer scsi, > > doesn't it? > > > > We have two layers interacting here: virtio-blk which may or may not > > offer scsi support, and the transport layer which may or may not offer > > VERSION_1 support. Failing scsi commands if VERSION_1 has been > > negotiated makes sense to me; but I don't want to disable scsi config a > > priori because the driver might negotiate VERSION_1. This would imply > > that virtio-blk over virtio-ccw would never offer scsi once we enable > > virtio-1 support, and it kind of defeats the purpose of a transitional > > device for me. > > > > (The other way round - fail negotiating revison 1 if the device was > > configured with scsi support - makes more sense to me.) > > For newer machine types, it would make sense to block VIRTIO_BLK_F_SCSI > altogether if !blk->conf.scsi. Would that fix the problem for you too? This is probably a sensible approach, and it can be contained in virtio-block, no?