Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- Optimise reqs_lock to make multiqueue actually scale
- virtio: Drop out of coroutine context in virtio_load()
- iotests: Fix reference output for some tests after recent changes
- vpc: Avoid dynamic stack allocation
- Code cleanup, improved documentation

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* tag 'for-upstream' of https://repo.or.cz/qemu/kevin:
  virtio: Drop out of coroutine context in virtio_load()
  vmstate: Mark VMStateInfo.get/put() coroutine_mixed_fn
  block: Make more BlockDriver definitions static
  block/meson.build: Restore alphabetical order of files
  block: Remove unnecessary variable in bdrv_block_device_info
  block: Remove bdrv_query_block_node_info
  vmdk: Clean up bdrv_open_child() return value check
  qemu-img: Update documentation for compressed images
  block: Be more verbose in create fallback
  block/iscsi: Document why we use raw malloc()
  qemu-img: omit errno value in error message
  block: change reqs_lock to QemuMutex
  block: minimize bs->reqs_lock section in tracked_request_end()
  iotests: adapt test output for new qemu_cleanup() behavior
  block/vpc: Avoid dynamic stack allocation

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --cc block.c
Simple merge

diff --cc block/io.c
Simple merge

diff --cc include/block/block_int-common.h
Simple merge