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migration: notify migration state before starting thread

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The migration thread runs outside the QEMU global mutex when possible.
Therefore we must notify migration state change *before* starting the
migration thread.

This allows registered listeners to act before live migration iterations
begin.  Therefore they can get into a state that allows for live
migration.  When the migration thread starts everything will be ready.

Without this patch there is a race condition during migration setup,
depending on whether the migration thread has already transitioned from
SETUP to ACTIVE state.

Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2013-07-29 15:01:57 +02:00
parent b681a1c73e
commit 9287ac271d
1 changed files with 3 additions and 1 deletions
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4
migration.c
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@ -658,7 +658,9 @@ void migrate_fd_connect(MigrationState *s)
qemu_file_set_rate_limit(s->file,
s->bandwidth_limit / XFER_LIMIT_RATIO);
/* Notify before starting migration thread */
notifier_list_notify(&migration_state_notifiers, s);
qemu_thread_create(&s->thread, migration_thread, s,
QEMU_THREAD_JOINABLE);
notifier_list_notify(&migration_state_notifiers, s);
}