[Qemu-devel] [PATCH v4 0/6] virtio: Merge virtio-{blk, scsi} host notifier handling paths

[Fam Zheng <famz@redhat.com>]

v4: Drop patch 1. [Cornelia]
    Add the last trivial patch.

v3: Rebase to master.
    Squash 4 into 3. [Paolo]
    Add comment and commit message. [Stefan]
    Add Stefan's r-b in patch 1 and 2.

v2: Only convert virtio-{blk,scsi}. [Paolo]

The benifit of this is we don't use event_notifier_set_handler even in
non-dataplane now, which in turn makes virtio-blk and virtio-scsi follow block
layer aio context semantics. Specifically, I/O requests must come from
blk_get_aio_context(blk) events, rather than iohandler_get_aio_context(), so
that bdrv_drained_begin/end will work as expected.

Patch 4 reverts the hack (ab27c3b5e7) we added for 2.6. Lately, commit
b880481579 added another pair of bdrv_drained_begin/end so the crash cannot
happen even without ab27c3b5e7, but in order to avoid leaking requests, patch
two is still a must.

Fam Zheng (6):
  virtio: Add typedef for handle_output
  virtio: Introduce virtio_add_queue_aio
  virtio-blk: Call virtio_add_queue_aio
  virtio-scsi: Call virtio_add_queue_aio
  Revert "mirror: Workaround for unexpected iohandler events during
    completion"
  virtio-scsi: Replace HandleOutput typedef

 block/mirror.c                  |  9 ---------
 hw/block/virtio-blk.c           |  2 +-
 hw/scsi/virtio-scsi.c           | 14 ++++++-------
 hw/virtio/virtio.c              | 45 +++++++++++++++++++++++++++++++++--------
 include/hw/virtio/virtio-scsi.h |  6 ++----
 include/hw/virtio/virtio.h      |  8 ++++++--
 6 files changed, 52 insertions(+), 32 deletions(-)

-- 
2.7.4