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[PATCH v2 0/4] Introduce 'yank' oob qmp command to recover from hanging
From: |
Lukas Straub |
Subject: |
[PATCH v2 0/4] Introduce 'yank' oob qmp command to recover from hanging qemu |
Date: |
Wed, 20 May 2020 23:05:27 +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
v2:
-don't touch io/ code anymore
-always register yank functions
-'yank' now takes a list of instances to yank
-'query-yank' returns a list of yankable instances
Lukas Straub (4):
Introduce yank feature
block/nbd.c: Add yank feature
chardev/char-socket.c: Add yank feature
migration: Add yank feature
Makefile.objs | 1 +
block/nbd.c | 101 ++++++++++++--------
chardev/char-socket.c | 24 +++++
migration/migration.c | 9 ++
migration/qemu-file-channel.c | 6 ++
migration/socket.c | 11 +++
qapi/misc.json | 45 +++++++++
softmmu/vl.c | 2 +
yank.c | 174 ++++++++++++++++++++++++++++++++++
yank.h | 69 ++++++++++++++
10 files changed, 405 insertions(+), 37 deletions(-)
create mode 100644 yank.c
create mode 100644 yank.h
--
2.20.1
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