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Migration pull for 9.0-rc3

Browse source 
- Wei/Lei's fix on a rare postcopy race that can hang the channel (since 8.0)
 - Avihai's fix on maintainers file, points to the right doc links
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Merge tag 'migration-20240407-pull-request' of https://gitlab.com/peterx/qemu into staging

Migration pull for 9.0-rc3

- Wei/Lei's fix on a rare postcopy race that can hang the channel (since 8.0)
- Avihai's fix on maintainers file, points to the right doc links

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* tag 'migration-20240407-pull-request' of https://gitlab.com/peterx/qemu:
  MAINTAINERS: Adjust migration documentation files
  migration/postcopy: ensure preempt channel is ready before loading states

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2024-04-08 16:24:04 +01:00
parent ce64e6224a 8e0b21e375
commit d276a51d18
2 changed files with 25 additions and 2 deletions
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6
MAINTAINERS
View file

@ -2170,7 +2170,7 @@ S: Supported
F: hw/vfio/*
F: include/hw/vfio/
F: docs/igd-assign.txt
F: docs/devel/vfio-migration.rst
F: docs/devel/migration/vfio.rst
vfio-ccw
M: Eric Farman <farman@linux.ibm.com>
@ -2231,6 +2231,7 @@ F: qapi/virtio.json
F: net/vhost-user.c
F: include/hw/virtio/
F: docs/devel/virtio*
F: docs/devel/migration/virtio.rst
virtio-balloon
M: Michael S. Tsirkin <mst@redhat.com>
@ -3422,7 +3423,7 @@ F: migration/
F: scripts/vmstate-static-checker.py
F: tests/vmstate-static-checker-data/
F: tests/qtest/migration-test.c
F: docs/devel/migration.rst
F: docs/devel/migration/
F: qapi/migration.json
F: tests/migration/
F: util/userfaultfd.c
@ -3442,6 +3443,7 @@ F: include/sysemu/dirtylimit.h
F: migration/dirtyrate.c
F: migration/dirtyrate.h
F: include/sysemu/dirtyrate.h
F: docs/devel/migration/dirty-limit.rst
Detached LUKS header
M: Hyman Huang <yong.huang@smartx.com>

21
migration/savevm.c
View file

@ -2342,6 +2342,27 @@ static int loadvm_handle_cmd_packaged(MigrationIncomingState *mis)
QEMUFile *packf = qemu_file_new_input(QIO_CHANNEL(bioc));
/*
* Before loading the guest states, ensure that the preempt channel has
* been ready to use, as some of the states (e.g. via virtio_load) might
* trigger page faults that will be handled through the preempt channel.
* So yield to the main thread in the case that the channel create event
* hasn't been dispatched.
*
* TODO: if we can move migration loadvm out of main thread, then we
* won't block main thread from polling the accept() fds. We can drop
* this as a whole when that is done.
*/
do {
if (!migrate_postcopy_preempt() || !qemu_in_coroutine() ||
mis->postcopy_qemufile_dst) {
break;
}
aio_co_schedule(qemu_get_current_aio_context(), qemu_coroutine_self());
qemu_coroutine_yield();
} while (1);
ret = qemu_loadvm_state_main(packf, mis);
trace_loadvm_handle_cmd_packaged_main(ret);
qemu_fclose(packf);