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Subject: Re: [virtio-dev] [PATCH] virtio-ccw: introduce revisions

On Thu, 10 Oct 2013 11:34:30 +0300
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> On Tue, Oct 08, 2013 at 05:19:05PM +0200, Cornelia Huck wrote:
> > Provide a new ccw that allows devices and drivers to operate on selected
> > revision levels.
> > 
> > VIRTIO-42
> > 
> > Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
> So basically, CCW_CMD_SET_VIRTIO_REV re-implements the VIRTIO_1 feature
> bit in a device specific manner.
> Now that we have FEATURES_OK, this does not seem to be needed?

The idea was to implement something like a 'revision id', which we
didn't have for ccw. It also allows for negotiating (the driver can try
revisions until it finds one that the device accepts) and extra
configuration specifics (the currently unused data field). As it needs
to be done before any other channel commands, it also allows for early

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