This is mostly useless, but useful for us to know whether the main channel is correctly established without changing the migration protocol.
Signed-off-by: Peter Xu <pet...@redhat.com> --- migration/migration.c | 3 +++ migration/migration.h | 6 ++++++ 2 files changed, 9 insertions(+) diff --git a/migration/migration.c b/migration/migration.c index 898bc9fe5c..fa59846717 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -2981,6 +2981,7 @@ retry: case MIG_RP_MSG_PONG: tmp32 = ldl_be_p(buf); trace_source_return_path_thread_pong(tmp32); + qemu_sem_post(&ms->rp_state.rp_pong_acks); break; case MIG_RP_MSG_REQ_PAGES: @@ -4470,6 +4471,7 @@ static void migration_instance_finalize(Object *obj) qemu_sem_destroy(&ms->postcopy_pause_sem); qemu_sem_destroy(&ms->postcopy_pause_rp_sem); qemu_sem_destroy(&ms->rp_state.rp_sem); + qemu_sem_destroy(&ms->rp_state.rp_pong_acks); qemu_sem_destroy(&ms->postcopy_qemufile_src_sem); error_free(ms->error); } @@ -4519,6 +4521,7 @@ static void migration_instance_init(Object *obj) qemu_sem_init(&ms->postcopy_pause_sem, 0); qemu_sem_init(&ms->postcopy_pause_rp_sem, 0); qemu_sem_init(&ms->rp_state.rp_sem, 0); + qemu_sem_init(&ms->rp_state.rp_pong_acks, 0); qemu_sem_init(&ms->rate_limit_sem, 0); qemu_sem_init(&ms->wait_unplug_sem, 0); qemu_sem_init(&ms->postcopy_qemufile_src_sem, 0); diff --git a/migration/migration.h b/migration/migration.h index ea8d083a51..61dc2c81df 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -275,6 +275,12 @@ struct MigrationState { */ bool rp_thread_created; QemuSemaphore rp_sem; + /* + * We post to this when we got one PONG from dest. So far it's an + * easy way to know the main channel has successfully established + * on dest QEMU. + */ + QemuSemaphore rp_pong_acks; } rp_state; double mbps; -- 2.37.3