[PATCH 1/2] migration: report migration related thread pid to libvirt

[Jiang Jiacheng]

From: Zheng Chuan <zhengchuan@huawei.com>

Report migration thread pid to libvirt in order to pin
migration thread to different cpu.
---
 migration/migration.c |  3 +++
 qapi/migration.json   | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/migration/migration.c b/migration/migration.c
index 52b5d39244..2534e5a1f1 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -3955,6 +3955,9 @@ static void *migration_thread(void *opaque)
     MigThrError thr_error;
     bool urgent = false;
 
+    /* report migration thread pid to libvirt */
+    qapi_event_send_migration_pid(qemu_get_thread_id());
+
     rcu_register_thread();
 
     object_ref(OBJECT(s));
diff --git a/qapi/migration.json b/qapi/migration.json
index 88ecf86ac8..aafc940617 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -1286,6 +1286,18 @@
 { 'event': 'MIGRATION_PASS',
   'data': { 'pass': 'int' } }
 
+##
+# @MIGRATION_PID:
+#
+# Emitted when migration thread appear
+#
+# @pid: pid of migration thread
+#
+# Since: 7.2
+##
+{ 'event': 'MIGRATION_PID',
+  'data': { 'pid': 'int' } }
+
 ##
 # @COLOMessage:
 #
-- 
2.33.0