[PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu

[Lukas Straub <lukasstraub2@web.de>]

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Hello Everyone,
In many cases, if qemu has a network connection (qmp, migration, chardev, etc.)
to some other server and that server dies or hangs, qemu hangs too.
These patches introduce the new 'yank' out-of-band qmp command to recover from
these kinds of hangs. The different subsystems register callbacks which get
executed with the yank command. For example the callback can shutdown() a
socket. This is intended for the colo use-case, but it can be used for other
things too of course.

Regards,
Lukas Straub

Lukas Straub (5):
  Introduce yank feature
  io/channel.c,io/channel-socket.c: Add yank feature
  block/nbd.c: Add yank feature
  chardev/char-socket.c: Add yank feature
  migration: Add yank feature

 Makefile.objs               |  2 +
 block/nbd.c                 | 68 ++++++++++++++++++++++++---------
 chardev/char-socket.c       |  8 ++++
 chardev/char.c              |  3 ++
 include/io/channel-socket.h |  1 +
 include/io/channel.h        | 12 ++++++
 io/channel-socket.c         | 29 ++++++++++++++
 io/channel.c                |  9 +++++
 migration/channel.c         |  2 +
 migration/migration.c       | 11 ++++++
 qapi/block-core.json        |  5 ++-
 qapi/char.json              |  5 ++-
 qapi/migration.json         | 17 +++++++--
 qapi/misc.json              | 15 ++++++++
 softmmu/vl.c                |  2 +
 yank.c                      | 75 +++++++++++++++++++++++++++++++++++++
 yank.h                      | 12 ++++++
 17 files changed, 254 insertions(+), 22 deletions(-)
 create mode 100644 yank.c
 create mode 100644 yank.h

-- 
2.20.1

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