Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

A few fixes that I've picked up.

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# gpg: Signature made Thu 09 Feb 2023 15:25:15 GMT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  iotests/detect-zeroes-registered-buf: add new test
  qemu-io: add -r option to register I/O buffer
  qemu-io: use BdrvRequestFlags instead of int
  block: fix detect-zeroes= with BDRV_REQ_REGISTERED_BUF
  virtio-blk: add missing AioContext lock
  vhost-user-fs: Back up vqs before cleaning up vhost_dev

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