[PATCH v2 00/13] block/export: convert vhost-user-blk-server to block exports API

[Stefan Hajnoczi]

v2:
 * Replace unix-socket=str with addr=SocketAddress for consistency with NBD and
   fd passing support. The new syntax is:
   --export vhost-user-blk,addr.type=unix,addr.path=/tmp/vhost-user-blk.sock,...
 * Make addr=SocketAddress mandatory instead of optional [Markus]
 * Update test-vhost-user-blk.c to use new syntax
 * Add patch moving vhost-user-server.h to include/
 * Add patch to use libvhost-user.a instead of compiling it multiple times

This patch series converts Coiby Xu's vhost-user-blk-server from a QOM object
to the block exports API. The block exports API provides a standard QMP and
command-line interface for managing block exports (NBD, FUSE, vhost-user-blk,
etc). A fair amount of init/shutdown code is removed because the block exports
API already takes care of that functionality.

Most of the patches are vhost-user-blk-server cleanups.

The syntax for launching qemu-storage-daemon is:

  $ qemu-storage-daemon \
      --blockdev file,node-name=drive0,filename=test.img \
      --export 
vhost-user-blk,node-name=drive0,id=export0,writable=on,addr.type=unix,addr.path=/tmp/vhost-user-blk.sock

QEMU can connect to the vhost-user-blk export like this:

  $ qemu-system-x86_64 \
      -M accel=kvm,memory-backend=mem \
      -m 1G \
      -object memory-backend-memfd,size=1G,id=mem \
      -cpu host \
      -chardev socket,path=/tmp/vhost-user-blk.sock,id=char0 \
      -device vhost-user-blk-pci,chardev=char0

Based-on: 20200918080912.321299-1-coiby.xu@gmail.com ("[PATCH v10 0/7] 
vhost-user block device backend implementation")
Based-on: 20200907182011.521007-1-kwolf@redhat.com ("[PATCH 00/29] 
block/export: Add infrastructure and QAPI for block exports")

Stefan Hajnoczi (13):
  block/export: shorten serial string to fit
  util/vhost-user-server: s/fileds/fields/ typo fix
  util/vhost-user-server: drop unnecessary QOM cast
  util/vhost-user-server: drop unnecessary watch deletion
  block/export: consolidate request structs into VuBlockReq
  util/vhost-user-server: drop unused DevicePanicNotifier
  util/vhost-user-server: fix memory leak in vu_message_read()
  util/vhost-user-server: check EOF when reading payload
  util/vhost-user-server: rework vu_client_trip() coroutine lifecycle
  block/export: report flush errors
  block/export: convert vhost-user-blk server to block export API
  util/vhost-user-server: move header to include/
  util/vhost-user-server: use static library in meson.build

 MAINTAINERS                                |   4 +-
 qapi/block-export.json                     |  21 +-
 block/export/vhost-user-blk-server.h       |  23 +-
 {util => include/qemu}/vhost-user-server.h |  32 +-
 block/export/export.c                      |   8 +-
 block/export/vhost-user-blk-server.c       | 525 ++++++---------------
 tests/qtest/vhost-user-blk-test.c          |   2 +-
 util/vhost-user-server.c                   | 334 ++++++-------
 block/export/meson.build                   |   1 +
 block/meson.build                          |   1 -
 contrib/libvhost-user/meson.build          |   1 +
 meson.build                                |   6 +-
 tests/qtest/meson.build                    |   2 +-
 util/meson.build                           |   4 +-
 14 files changed, 376 insertions(+), 588 deletions(-)
 rename {util => include/qemu}/vhost-user-server.h (72%)

-- 
2.26.2