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

- Allow concurrent BB context changes
- virtio: Re-enable notifications after drain
- virtio-blk: Fix missing use of irqfd
- scsi: Don't ignore most usb-storage properties
- blkio: Respect memory-alignment for bounce buffer allocations
- iotests tmpdir fixes
- virtio-blk: Code cleanups

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* tag 'for-upstream' of https://repo.or.cz/qemu/kevin:
  virtio-blk: avoid using ioeventfd state in irqfd conditional
  virtio-blk: Use ioeventfd_attach in start_ioeventfd
  virtio: Re-enable notifications after drain
  virtio-scsi: Attach event vq notifier with no_poll
  blkio: Respect memory-alignment for bounce buffer allocations
  scsi: Don't ignore most usb-storage properties
  virtio-blk: do not use C99 mixed declarations
  iotests: give tempdir an identifying name
  iotests: fix leak of tmpdir in dry-run mode
  scsi: Await request purging
  block-backend: Allow concurrent context changes
  monitor: use aio_co_reschedule_self()
  virtio-blk: declare VirtIOBlock::rq with a type
  virtio-blk: add vq_rq[] bounds check in virtio_blk_dma_restart_cb()
  virtio-blk: clarify that there is at least 1 virtqueue
  virtio-blk: enforce iothread-vq-mapping validation

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>