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migration: fix migrate_cancel leads live_migration thread hung forever 

When we 'migrate_cancel' a multifd migration, live_migration thread may
hung forever at some points, because of multifd_send_thread has already
exit for socket error:
1. multifd_send_pages may hung at qemu_sem_wait(&multifd_send_state->
   channels_ready)
2. multifd_send_sync_main my hung at qemu_sem_wait(&multifd_send_state->
   sem_sync)

Signed-off-by: Ivan Ren <ivanren@tencent.com>
Message-Id: <1561468699-9819-3-git-send-email-ivanren@tencent.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

---

Remove spurious not needed bits
This commit is contained in:
Ivan Ren 2019-06-25 21:18:18 +08:00 committed by Juan Quintela
parent 713f762a31
commit a3ec6b7d23
1 changed files with 14 additions and 2 deletions
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16
migration/ram.c
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@ -1097,7 +1097,8 @@ static void *multifd_send_thread(void *opaque)
{
MultiFDSendParams *p = opaque;
Error *local_err = NULL;
int ret;
int ret = 0;
uint32_t flags = 0;
trace_multifd_send_thread_start(p->id);
rcu_register_thread();
@ -1115,7 +1116,7 @@ static void *multifd_send_thread(void *opaque)
if (p->pending_job) {
uint32_t used = p->pages->used;
uint64_t packet_num = p->packet_num;
uint32_t flags = p->flags;
flags = p->flags;
p->next_packet_size = used * qemu_target_page_size();
multifd_send_fill_packet(p);
@ -1164,6 +1165,17 @@ out:
multifd_send_terminate_threads(local_err);
}
/*
* Error happen, I will exit, but I can't just leave, tell
* who pay attention to me.
*/
if (ret != 0) {
if (flags & MULTIFD_FLAG_SYNC) {
qemu_sem_post(&multifd_send_state->sem_sync);
}
qemu_sem_post(&multifd_send_state->channels_ready);
}
qemu_mutex_lock(&p->mutex);
p->running = false;
qemu_mutex_unlock(&p->mutex);