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[PATCH v4 0/4] Introduce 'yank' oob qmp command to recover from hanging
From: |
Lukas Straub |
Subject: |
[PATCH v4 0/4] Introduce 'yank' oob qmp command to recover from hanging qemu |
Date: |
Mon, 25 May 2020 17:44:12 +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
v4:
-fix build errors...
v3:
-don't touch softmmu/vl.c, use __contructor__ attribute instead (Paolo Bonzini)
-fix build errors
-rewrite migration patch so it actually passes all tests
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 | 3 +
block/nbd.c | 101 ++++++++++++--------
chardev/char-socket.c | 24 +++++
migration/channel.c | 12 +++
migration/migration.c | 18 +++-
migration/multifd.c | 10 ++
migration/qemu-file-channel.c | 6 ++
migration/savevm.c | 2 +
qapi/misc.json | 45 +++++++++
tests/Makefile.include | 2 +-
yank.c | 174 ++++++++++++++++++++++++++++++++++
yank.h | 67 +++++++++++++
12 files changed, 425 insertions(+), 39 deletions(-)
create mode 100644 yank.c
create mode 100644 yank.h
--
2.20.1
pgpmkqfbkQt30.pgp
Description: OpenPGP digital signature
- [PATCH v4 0/4] Introduce 'yank' oob qmp command to recover from hanging qemu,
Lukas Straub <=