On Wed, 24 Jun 2020 21:47:46 +0200
Lukas Straub <lukasstraub2@web.de> wrote:
> On Tue, 23 Jun 2020 16:42:30 +0200
> Lukas Straub <lukasstraub2@web.de> wrote:
>
> > 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
>
> Forgot to cc Stefan Hajnoczi...
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