Hi all. That's a preparation for vhost-user-blk backend-transfer
feature.

v4: rebase on master, and follow Michael's comments:
04: cover one more (new) dev->protocol-features access, keep r-bs
06: add r-b by Daniil
07: new
08: support virtio-ccw, drop r-b
11: rebase on changed code in master, drop r-bs
15: rebase on changed code in master, drop r-bs
16: rebase on changed code in master, drop r-bs
21: add macro VHOST_USER_CASE, drop r-bs
23: s/virtque/virtqueue/, keep r-bs

I also have dropped
 [PATCH v3 18/23] vhost: introduce check_memslots() helper
as it was doubtful, and I'm not sure now, do I really need
it, and should it be done this way. Will look, when reworking
actual vhost-user-blk backend-transfer series on top of this.

And can't keep t-b of v3, I think.

Vladimir Sementsov-Ogievskiy (23):
  vhost-user: rework enabling vrings
  vhost: drop backend_features field
  vhost-user: introduce vhost_user_has_protocol_feature() helper
  vhost: move protocol_features to vhost_user
  vhost-user-gpu: drop code duplication
  vhost: make vhost_dev.features private
  virtio-ccw: virtio_ccw_set_guest_notifier(): fix failure path
  virtio: move common part of _set_guest_notifier to generic code
  virtio: drop *_set_guest_notifier_fd_handler() helpers
  vhost-user: keep QIOChannelSocket for backend channel
  vhost: vhost_virtqueue_start(): fix failure path
  vhost: make vhost_memory_unmap() null-safe
  vhost: simplify calls to vhost_memory_unmap()
  vhost: move vrings mapping to the top of vhost_virtqueue_start()
  vhost: vhost_virtqueue_start(): drop extra local variables
  vhost: final refactoring of vhost vrings map/unmap
  vhost: simplify vhost_dev_init() error-path
  vhost: move busyloop timeout initialization to vhost_virtqueue_init()
  vhost: vhost_dev_init(): simplify features initialization
  hw/virtio/virtio-bus: refactor virtio_bus_set_host_notifier()
  vhost-user: make trace events more readable
  vhost-user-blk: add some useful trace-points
  vhost: add some useful trace-points

 backends/cryptodev-vhost.c     |   9 +-
 hw/block/trace-events          |  10 ++
 hw/block/vhost-user-blk.c      |  20 ++-
 hw/display/vhost-user-gpu.c    |  11 +-
 hw/net/vhost_net.c             |  35 ++---
 hw/s390x/virtio-ccw.c          |  34 ++---
 hw/scsi/vhost-scsi.c           |   1 -
 hw/scsi/vhost-user-scsi.c      |   1 -
 hw/virtio/trace-events         |  16 +-
 hw/virtio/vdpa-dev.c           |   3 +-
 hw/virtio/vhost-user-base.c    |   8 +-
 hw/virtio/vhost-user.c         | 258 ++++++++++++++++++++++-----------
 hw/virtio/vhost.c              | 238 +++++++++++++++---------------
 hw/virtio/virtio-bus.c         |  18 +--
 hw/virtio/virtio-hmp-cmds.c    |   2 -
 hw/virtio/virtio-mmio.c        |  41 +-----
 hw/virtio/virtio-pci.c         |  34 +----
 hw/virtio/virtio-qmp.c         |  12 +-
 hw/virtio/virtio.c             |  48 +++---
 include/hw/virtio/vhost-user.h |   3 +
 include/hw/virtio/vhost.h      |  63 +++++---
 include/hw/virtio/virtio-pci.h |   3 -
 include/hw/virtio/virtio.h     |  16 +-
 net/vhost-vdpa.c               |   7 +-
 qapi/virtio.json               |   3 -
 25 files changed, 487 insertions(+), 407 deletions(-)

-- 
2.52.0