[PATCH v3 0/5] block-backend: process I/O in the current AioContext

[Stefan Hajnoczi <stefanha@redhat.com>]

v3
- Add Patch 2 to fix a race condition in test-bdrv-drain. This was the CI
  failure that bumped this patch series from Kevin's pull request.
- Add missing 051.pc.out file. I tried qemu-system-aarch64 to see of 051.out
  also needs to be updated, but no changes were necessary. [Kevin]
v2
- Add patch to remove AIOCBInfo->get_aio_context() [Kevin]
- Add patch to use qemu_get_current_aio_context() in block-coroutine-wrapper so
  that the wrappers use the current AioContext instead of
  bdrv_get_aio_context().

Switch blk_aio_*() APIs over to multi-queue by using
qemu_get_current_aio_context() instead of blk_get_aio_context(). This change
will allow devices to process I/O in multiple IOThreads in the future.

The final patch requires my QIOChannel AioContext series to pass
tests/qemu-iotests/check -qcow2 281 because the nbd block driver is now
accessed from the main loop thread in addition to the IOThread:
https://lore.kernel.org/qemu-devel/20230823234504.1387239-1-stefanha@redhat.com/T/#t

Based-on: 20230823234504.1387239-1-stefanha@redhat.com

Stefan Hajnoczi (5):
  block: remove AIOCBInfo->get_aio_context()
  test-bdrv-drain: avoid race with BH in IOThread drain test
  block-backend: process I/O in the current AioContext
  block-backend: process zoned requests in the current AioContext
  block-coroutine-wrapper: use qemu_get_current_aio_context()

 include/block/aio.h                |  1 -
 include/block/block-global-state.h |  2 ++
 include/block/block-io.h           |  1 -
 block/block-backend.c              | 35 ++++++++----------------------
 block/io.c                         | 23 +++++++-------------
 hw/nvme/ctrl.c                     |  7 ------
 softmmu/dma-helpers.c              |  8 -------
 tests/unit/test-bdrv-drain.c       |  8 +++++++
 util/thread-pool.c                 |  8 -------
 scripts/block-coroutine-wrapper.py |  6 ++---
 tests/qemu-iotests/051.pc.out      |  4 ++--
 11 files changed, 31 insertions(+), 72 deletions(-)

-- 
2.41.0