vl: Introduce shutdown_notifiers

Notifier will be used for signaling shutdown event to inform system is
shutdown. This will allow devices and other component to run some
cleanup code needed before VM is shutdown.

Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/vl.c b/vl.c
index 46ebf81..8353d3c 100644
--- a/vl.c
+++ b/vl.c
@@ -1577,6 +1577,8 @@ static NotifierList suspend_notifiers =
     NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
 static NotifierList wakeup_notifiers =
     NOTIFIER_LIST_INITIALIZER(wakeup_notifiers);
+static NotifierList shutdown_notifiers =
+    NOTIFIER_LIST_INITIALIZER(shutdown_notifiers);
 static uint32_t wakeup_reason_mask = ~(1 << QEMU_WAKEUP_REASON_NONE);
 
 ShutdownCause qemu_shutdown_requested_get(void)
@@ -1828,6 +1830,12 @@ static void qemu_system_powerdown(void)
     notifier_list_notify(&powerdown_notifiers, NULL);
 }
 
+static void qemu_system_shutdown(ShutdownCause cause)
+{
+    qapi_event_send_shutdown(shutdown_caused_by_guest(cause), cause);
+    notifier_list_notify(&shutdown_notifiers, &cause);
+}
+
 void qemu_system_powerdown_request(void)
 {
     trace_qemu_system_powerdown_request();
@@ -1840,6 +1848,11 @@ void qemu_register_powerdown_notifier(Notifier *notifier)
     notifier_list_add(&powerdown_notifiers, notifier);
 }
 
+void qemu_register_shutdown_notifier(Notifier *notifier)
+{
+    notifier_list_add(&shutdown_notifiers, notifier);
+}
+
 void qemu_system_debug_request(void)
 {
     debug_requested = 1;
@@ -1867,7 +1880,7 @@ static bool main_loop_should_exit(void)
     request = qemu_shutdown_requested();
     if (request) {
         qemu_kill_report();
-        qapi_event_send_shutdown(shutdown_caused_by_guest(request), request);
+        qemu_system_shutdown(request);
         if (no_shutdown) {
             vm_stop(RUN_STATE_SHUTDOWN);
         } else {