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virtio-ccw: Wire up ioeventfd.
On hosts that support ioeventfd, make use of it for host-to-guestnotifications via diagnose 500.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
s390: Virtual channel subsystem support.
Provide a mechanism for qemu to provide fully virtual subchannels tothe guest.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>Signed-off-by: Alexander Graf <agraf@suse.de>