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[PATCH v5 0/7] Introduce 'yank' oob qmp command to recover from hanging
From: |
Lukas Straub |
Subject: |
[PATCH v5 0/7] Introduce 'yank' oob qmp command to recover from hanging qemu |
Date: |
Tue, 23 Jun 2020 16:42:30 +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
v5:
-move yank.c to util/
-move yank.h to include/qemu/
-add license to yank.h
-use const char*
-nbd: use atomic_store_release and atomic_load_aqcuire
-io-channel: ensure thread-safety and document it
-add myself as maintainer for yank
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 (7):
Introduce yank feature
block/nbd.c: Add yank feature
chardev/char-socket.c: Add yank feature
migration: Add yank feature
io/channel-tls.c: make qio_channel_tls_shutdown thread-safe
io: Document thread-safety of qio_channel_shutdown
MAINTAINERS: Add myself as maintainer for yank feature
MAINTAINERS | 13 +++
block/nbd.c | 101 ++++++++++++-------
chardev/char-socket.c | 24 +++++
include/io/channel.h | 2 +
include/qemu/yank.h | 79 +++++++++++++++
io/channel-tls.c | 6 +-
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 +-
util/Makefile.objs | 1 +
util/yank.c | 179 ++++++++++++++++++++++++++++++++++
15 files changed, 459 insertions(+), 41 deletions(-)
create mode 100644 include/qemu/yank.h
create mode 100644 util/yank.c
--
2.20.1
pgpH1Z6e8a5Yd.pgp
Description: OpenPGP digital signature
- [PATCH v5 0/7] Introduce 'yank' oob qmp command to recover from hanging qemu,
Lukas Straub <=
- [PATCH v5 1/7] Introduce yank feature, Lukas Straub, 2020/06/23
- [PATCH v5 2/7] block/nbd.c: Add yank feature, Lukas Straub, 2020/06/23
- [PATCH v5 3/7] chardev/char-socket.c: Add yank feature, Lukas Straub, 2020/06/23
- [PATCH v5 4/7] migration: Add yank feature, Lukas Straub, 2020/06/23
- [PATCH v5 5/7] io/channel-tls.c: make qio_channel_tls_shutdown thread-safe, Lukas Straub, 2020/06/23
- [PATCH v5 6/7] io: Document thread-safety of qio_channel_shutdown, Lukas Straub, 2020/06/23
- [PATCH v5 7/7] MAINTAINERS: Add myself as maintainer for yank feature, Lukas Straub, 2020/06/23
- Re: [PATCH v5 0/7] Introduce 'yank' oob qmp command to recover from hanging qemu, Lukas Straub, 2020/06/24