[Qemu-devel] [PATCH v8 01/24] migration: let incoming side use thread context

[Peter Xu <peterx@redhat.com>]

The old incoming migration is running in main thread and default
gcontext.  With the new qio_channel_add_watch_full() we can now let it
run in the thread's own gcontext (if there is one).

Currently this patch does nothing alone.  But when any of the incoming
migration is run in another iothread (e.g., the upcoming migrate-recover
command), this patch will bind the incoming logic to the iothread
instead of the main thread (which may already get page faulted and
hanged).

RDMA is not considered for now since it's not even using the QIO watch
framework at all.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/exec.c   | 9 ++++-----
 migration/fd.c     | 9 ++++-----
 migration/socket.c | 7 ++++---
 3 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/migration/exec.c b/migration/exec.c
index 0bc5a427dd..9d0f82f1f0 100644
--- a/migration/exec.c
+++ b/migration/exec.c
@@ -65,9 +65,8 @@ void exec_start_incoming_migration(const char *command, Error **errp)
     }
 
     qio_channel_set_name(ioc, "migration-exec-incoming");
-    qio_channel_add_watch(ioc,
-                          G_IO_IN,
-                          exec_accept_incoming_migration,
-                          NULL,
-                          NULL);
+    qio_channel_add_watch_full(ioc, G_IO_IN,
+                               exec_accept_incoming_migration,
+                               NULL, NULL,
+                               g_main_context_get_thread_default());
 }
diff --git a/migration/fd.c b/migration/fd.c
index cd06182d1e..9a380bbbc4 100644
--- a/migration/fd.c
+++ b/migration/fd.c
@@ -66,9 +66,8 @@ void fd_start_incoming_migration(const char *infd, Error **errp)
     }
 
     qio_channel_set_name(QIO_CHANNEL(ioc), "migration-fd-incoming");
-    qio_channel_add_watch(ioc,
-                          G_IO_IN,
-                          fd_accept_incoming_migration,
-                          NULL,
-                          NULL);
+    qio_channel_add_watch_full(ioc, G_IO_IN,
+                               fd_accept_incoming_migration,
+                               NULL, NULL,
+                               g_main_context_get_thread_default());
 }
diff --git a/migration/socket.c b/migration/socket.c
index 122d8ccfbe..8d4cf76295 100644
--- a/migration/socket.c
+++ b/migration/socket.c
@@ -160,9 +160,10 @@ static void socket_start_incoming_migration(SocketAddress *saddr,
         return;
     }
 
-    qio_net_listener_set_client_func(listener,
-                                     socket_accept_incoming_migration,
-                                     NULL, NULL);
+    qio_net_listener_set_client_func_full(listener,
+                                          socket_accept_incoming_migration,
+                                          NULL, NULL,
+                                          g_main_context_get_thread_default());
 }
 
 void tcp_start_incoming_migration(const char *host_port, Error **errp)
-- 
2.14.3