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[PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qem
From: |
Lukas Straub |
Subject: |
[PATCH 0/5] Introduce 'yank' oob qmp command to recover from hanging qemu |
Date: |
Mon, 11 May 2020 13:14:34 +0200 |
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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