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

Block layer patches

- aio-posix: Fix race during epoll upgrade
- vhost-user-blk/VDUSE export: Fix a potential deadlock and an assertion
  failure when the export runs in an iothread
- NBD server: Push pending frames after sending reply to fix performance
  especially when used with TLS

# -----BEGIN PGP SIGNATURE-----
#
# iQJFBAABCAAvFiEE3D3rFZqa+V09dFb+fwmycsiPL9YFAmQi3s4RHGt3b2xmQHJl
# ZGhhdC5jb20ACgkQfwmycsiPL9Yz7hAAq9UVPOfr8SF5WjxuZBNifYI13uazp9cG
# UdDC4Be2zNSkw9WGb+thHHjvqyQ49tAmT70bTocNk8VEAjAJ5J4VrCOlyz7pcy2w
# PdJf1RxaUSEV4Fl5lThrUeOv5sX3hSm/Z8X9WLYLjYxOGJOpITkQ0eM7PDwwsiPd
# hXLOAWabcJbx/m2HQphUG5ZoC2omgfY2ICrlr4Bvziak63cT+ZTVfKTvVebtEZ9B
# zn+BfrzDra/rkLJEM9JfgQXjYo3Cxrv5MjYzDpeRCHPwnseZnlbHlE3nrHWYDuLW
# fsd6RpsoOW6mHEx4aO6xLAVu+iIfouVOjV5ZWRvcKw5UyiejW/DkduppERMbWx/y
# Wfq95O/4UjFop3fw+UGGdHtASjnUJM35QR9wo+bM2vS219DLTJ/7mKOhBDajHQy4
# 3ynk39uEnkRyLrKUMvR9qZ7t7pvumXEEA5qtPGJwnvOXm9shlKrJ8f3TzUGBKpQS
# KPYEAJPO/HmyvswsfTmC7Yy5uh2o67nsMdDy7HEq0MZW5+pBpAML+zv4qyQKtDsg
# GzoIL+zd09Yyh+wK9+NPzX9p7DZus7NRlig9byGCpD48gqzeABL6CQotNlm93pgj
# eybiMStrCPIOt8AZM5j8yxh1RBiM2L7sZeTBaFXyQiwrlYOW4xGybivzcwQAEFGN
# iKRB0fttcQE=
# =+vQj
# -----END PGP SIGNATURE-----
# gpg: Signature made Tue 28 Mar 2023 13:34:22 BST
# gpg:                using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg:                issuer "kwolf@redhat.com"
# 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:
  block/export: Fix graph locking in blk_get_geometry() call
  aio-posix: fix race between epoll upgrade and aio_set_fd_handler()
  block/export: only acquire AioContext once for vhost_user_server_stop()
  nbd/server: push pending frames after sending reply

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