[OASIS Issue Tracker] Created: (VIRTIO-30) allow required features

allow required features
-----------------------

                 Key: VIRTIO-30
                 URL: http://tools.oasis-open.org/issues/browse/VIRTIO-30
             Project: OASIS Virtual I/O Device (VIRTIO) TC
          Issue Type: New Feature
         Environment: guest driver
            Reporter: Michael Tsirkin
            Assignee: Michael Tsirkin


in the past we sometimes wanted an ability to make driver gracefully fail early in initialization
if it does not recognize/support a feature.
One such example we are introducing right now is the new VERSION_1 feature.



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