virtio-ccw: handle virtio 1 only devices
As a preparation for wiring-up virtio-crypto, the first non-transitional virtio device on the ccw transport, let us introduce a mechanism for disabling revision 0. This is more or less equivalent with disabling legacy as revision 0 is legacy only, and legacy drivers use the revision 0 exclusively. Signed-off-by: NHalil Pasic <pasic@linux.vnet.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
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