virtio-scsi multiqueue

This series implements virtio-scsi queue steering, which gives
performance improvements of up to 50% (measured both with QEMU and
tcm_vhost backends).  The patches build on top of the new virtio APIs
at http://permalink.gmane.org/gmane.linux.kernel.virtualizat...;
the new API simplifies the locking of the virtio-scsi driver nicely,
thus it makes sense to require them as a prerequisite.

Changes from the previous post, which can be found at
http://permalink.gmane.org/gmane.linux.kernel.virtualizat...

- patches 1 and 2 ("virtio: add functions for piecewise addition of
  buffers", "virtio-scsi: use functions for piecewise composition of
  buffers") split into their own series

- new cleanup patch "virtio-scsi: push vq lock/unlock into virtscsi_vq_done"

- reorganized code to move ACCESS_ONCE in a clearer place

- included Wanlong Gao's CPU hotplug patches

Ok for 3.9?  It would probably be easier to get it in via Rusty's tree
because of the prerequisites.  James, can I get your Acked-by?

Paolo

Paolo Bonzini (4):
  virtio-scsi: redo allocation of target data
  virtio-scsi: pass struct virtio_scsi to virtqueue completion function
  virtio-scsi: push vq lock/unlock into virtscsi_vq_done
  virtio-scsi: introduce multiqueue support

Wanlong Gao (1):
  virtio-scsi: reset virtqueue affinity when doing cpu hotplug

 drivers/scsi/virtio_scsi.c |  360 +++++++++++++++++++++++++++++++++++---------
 1 files changed, 292 insertions(+), 68 deletions(-)

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