[OASIS Issue Tracker] Created: (VIRTIO-43) ccw: Support for adapter interrupts.

ccw: Support for adapter interrupts.
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                 Key: VIRTIO-43
                 URL: http://tools.oasis-open.org/issues/browse/VIRTIO-43
             Project: OASIS Virtual I/O Device (VIRTIO) TC
          Issue Type: New Feature
            Reporter: Cornelia Huck


We want to be able to use adapter interrupts instead of classic I/O interrupts for virtio-ccw for several reasons:

- Less exits, since we don't need TEST SUBCHANNEL for every interrupt and can coalesce interrupts for different devices
- Common guest code with zPCI
- Ability to make use of irqfds

For this, we need a new channel command to set up two-stage indicator bits.


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