[QEMU HCI-8.0 PATCH v4 0/5] vhost-blk change backend setup

[Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com>]

This series changes vhost-blk backend setup from block node to
a path to the device.
Getting fd from block node was a hack in the first place. It
looked ugly and broke encapsulation.
Change vhost-blk to have it's own property so it opens and owns
the descriptor.

Patches #4 implement auto-resize by watching netlink. The descripor
comes prepared with some filter from outside.

v2:
patch#1
 - old patch dropped

patch#2
 - moved double close fix to new 'do not double close vhostfd' patch
 - dropped DEFINE_BLOCK_PROPERTIES_BASE exposition to the outside. Let's
just use defaults for now. We can later check if tweaking this values
makes any difference and add them back.
 - change vhost_blk_update_size() to return zero or error and move 'changed'
to a separate argument
 - changed lseek to BLKGETSIZE64 (we already use BLKROGET anyway)

patch#3
 - check BLKROGET only if rw was requested

patch#4
 - rework patch a bit: now we expect opened and filtered fd from
libvirt.

patch#5
 - old one dropped, setup moved to libvirt
 - added new patch to support uevent socket cpr

v3:
patch#1
 - extend the double-close fix to preserve and free vqs after
vhost_dev_init() clears dev

patch#2
 - make vhost_blk_update_size() return the changed flag directly
 - use ERRP_GUARD() for reliable error propagation

patch#4
 - accept a monitor fd name passed with getfd instead of a
/dev/fdset path
 - verify that the socket is subscribed to kernel uevents
 - detach the socket after a permanent receive error

patch#5
 - use the proxy ID for the CPR fd name and block CPR without an ID
 - validate restored sockets and improve failure cleanup

v4:
patch#2
 - document the default geometry values

patch#4
 - keep the uevent socket local until it has been validated

patch#5
 - split cold-boot and restore socket setup paths
 - reject restored socket/property mismatches
 - block CPR after a permanent uevent receive error

Andrey Zhadchenko (5):
  vhost-blk: improve vhost_blk_device_realize cleanup
  vhost-blk: change backend setup
  vhost-blk: add read-only flag
  vhost-blk: watch the device for resize events
  vhost-blk: preserve the uevent socket across cpr-exec

 hw/block/vhost-blk.c          | 452 ++++++++++++++++++++++++++++++----
 include/hw/virtio/vhost-blk.h |  11 +-
 2 files changed, 415 insertions(+), 48 deletions(-)

-- 
2.43.5