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

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

Block layer patches

- virtio-blk: Multiqueue support (configurable iothread per queue)
- Made NBD export and hw/scsi thread-safe without AioContext lock
- Fix crash when loading snapshot on inactive node

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# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* tag 'for-upstream' of https://repo.or.cz/qemu/kevin: (33 commits)
  virtio-blk: add iothread-vq-mapping parameter
  qdev: add IOThreadVirtQueueMappingList property type
  qdev-properties: alias all object class properties
  string-output-visitor: show structs as "<omitted>"
  block-coroutine-wrapper: use qemu_get_current_aio_context()
  block: remove outdated AioContext locking comments
  job: remove outdated AioContext locking comments
  scsi: remove outdated AioContext lock comment
  docs: remove AioContext lock from IOThread docs
  aio: remove aio_context_acquire()/aio_context_release() API
  aio-wait: draw equivalence between AIO_WAIT_WHILE() and AIO_WAIT_WHILE_UNLOCKED()
  scsi: remove AioContext locking
  block: remove bdrv_co_lock()
  block: remove AioContext locking
  graph-lock: remove AioContext locking
  aio: make aio_context_acquire()/aio_context_release() a no-op
  tests: remove aio_context_acquire() tests
  scsi: assert that callbacks run in the correct AioContext
  virtio-scsi: replace AioContext lock with tmf_bh_lock
  dma-helpers: don't lock AioContext in dma_blk_cb()
  ...

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