migration: implement bi-directional RDMA QIOChannel

This patch implements bi-directional RDMA QIOChannel. Because different
threads may access RDMAQIOChannel currently, this patch use RCU to protect it.

Signed-off-by: Lidong Chen <lidongchen@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>

1 files changed, 2 insertions, 0 deletions

diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index 932f188949..3952d78e6b 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -853,6 +853,7 @@ static void *postcopy_ram_fault_thread(void *opaque)
     RAMBlock *rb = NULL;
 
     trace_postcopy_ram_fault_thread_entry();
+    rcu_register_thread();
     mis->last_rb = NULL; /* last RAMBlock we sent part of */
     qemu_sem_post(&mis->fault_thread_sem);
 
@@ -1059,6 +1060,7 @@ retry:
             }
         }
     }
+    rcu_unregister_thread();
     trace_postcopy_ram_fault_thread_exit();
     g_free(pfd);
     return NULL;