* Daniel P. Berrangé (berra...@redhat.com) wrote: > On Thu, Aug 27, 2020 at 10:42:46AM +0200, Lukas Straub wrote: > > On Tue, 18 Aug 2020 14:26:31 +0200 > > Lukas Straub <lukasstra...@web.de> wrote: > > > > > On Tue, 4 Aug 2020 10:11:22 +0200 > > > Lukas Straub <lukasstra...@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 > > > > > > > > v7: > > > > -yank_register_instance now returns error via Error **errp instead of > > > > aborting > > > > -dropped "chardev/char.c: Check for duplicate id before creating > > > > chardev" > > > > > > > > v6: > > > > -add Reviewed-by and Acked-by tags > > > > -rebase on master > > > > -lots of changes in nbd due to rebase > > > > -only take maintainership of util/yank.c and include/qemu/yank.h > > > > (Daniel P. Berrangé) > > > > -fix a crash discovered by the newly added chardev test > > > > -fix the test itself > > > > > > > > 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 (8): > > > > 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 > > > > tests/test-char.c: Wait for the chardev to connect in > > > > char_socket_client_dupid_test > > > > > > > > MAINTAINERS | 6 ++ > > > > block/nbd.c | 129 +++++++++++++++--------- > > > > chardev/char-socket.c | 31 ++++++ > > > > include/io/channel.h | 2 + > > > > include/qemu/yank.h | 80 +++++++++++++++ > > > > io/channel-tls.c | 6 +- > > > > migration/channel.c | 12 +++ > > > > migration/migration.c | 25 ++++- > > > > migration/multifd.c | 10 ++ > > > > migration/qemu-file-channel.c | 6 ++ > > > > migration/savevm.c | 6 ++ > > > > qapi/misc.json | 45 +++++++++ > > > > tests/Makefile.include | 2 +- > > > > tests/test-char.c | 1 + > > > > util/Makefile.objs | 1 + > > > > util/yank.c | 184 ++++++++++++++++++++++++++++++++++ > > > > 16 files changed, 493 insertions(+), 53 deletions(-) > > > > create mode 100644 include/qemu/yank.h > > > > create mode 100644 util/yank.c > > > > > > > > -- > > > > 2.20.1 > > > > > > Ping... > > > > Ping 2... > > > > Also, can the different subsystems have a look at this and give their ok? > > We need ACKs from the NBD, migration and chardev maintainers, for the > respective patches, then I think this series is ready for a pull request.
I'm happy from Migration: Acked-by: Dr. David Alan Gilbert <dgilb...@redhat.com> > Once acks arrive, I'm happy to send a PULL unless someone else has a > desire todo it. Looks like Markus would like a QMP tweak; but other than that I'd also be happy to take it via migration; whichever is easiest. Dave > > Regards, > Daniel > -- > |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| > |: https://libvirt.org -o- https://fstop138.berrange.com :| > |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK