virtio/s390: add parameter for minimum revision
We use transport revisions in virtio-ccw for introducing new commands
etc.; revision 1 denotes operating according to the standard. Legacy
devices do not understand the command to set a revision; for those, we
presume to operate at revision 0.
Add a parameter min_revision to be able to actively restrict use of
old transport revisions. In particular, setting a minimum revision
of 1 makes our driver act as a non-transitional driver.
With the default min_revision of 0, we continue to act as a
transitional driver.
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
1 file changed
