[Qemu-devel] [PATCH RFC 0/6] virtio: refactor host notifiers

[Cornelia Huck <cornelia.huck@de.ibm.com>]

As discussed in the virtio-blk dataplane start/stop thread, the
various transports contain a lot of similar/identical boilerplate
code for setting up ioeventfds. This makes the code hard to follow.

Let's drag all of the common handling into the virtio-bus layer,
hopefully reducing both the boilerplate code and the number of
indirections.

This RFC patchset is the result of hacking this up quickly, and I
was rather surprised that it did not die immediately on my s390
system (which is all I 'tested'). So be warned :)

Feedback about the approach and the interface would be good.

Cornelia Huck (6):
  virtio-bus: common ioeventfd infrastructure
  virtio-bus: have callers tolerate new host notifier api
  virtio-ccw: convert to ioeventfd callbacks
  virtio-pci: convert to ioeventfd callbacks
  virtio-mmio: convert to ioeventfd callbacks
  virtio-bus: remove old set_host_notifier callback

 hw/block/dataplane/virtio-blk.c |   6 +-
 hw/s390x/virtio-ccw.c           | 133 ++++++++++++++--------------------------
 hw/scsi/virtio-scsi-dataplane.c |   9 ++-
 hw/virtio/vhost.c               |  13 ++--
 hw/virtio/virtio-bus.c          | 108 ++++++++++++++++++++++++++++++++
 hw/virtio/virtio-mmio.c         | 128 +++++++++++++-------------------------
 hw/virtio/virtio-pci.c          | 124 +++++++++++++------------------------
 include/hw/virtio/virtio-bus.h  |  15 ++++-
 8 files changed, 263 insertions(+), 273 deletions(-)

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2.6.5