[RFC PATCH v2 04/44] vl: Introduce machine_init_done_late notifier

[isaku.yamahata@xxxxxxxxx]

From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>

Introduce a new notifier, machine_init_done_late, that is notified after
machine_init_done.  This will be used by TDX to generate the HOB for its
virtual firmware, which needs to be done after all guest memory has been
added, i.e. after machine_init_done notifiers have run.  Some code
registers memory by machine_init_done().

Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
 hw/core/machine.c       | 26 ++++++++++++++++++++++++++
 include/sysemu/sysemu.h |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/hw/core/machine.c b/hw/core/machine.c
index ffc076ae84..66c39cf72a 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -1278,6 +1278,31 @@ void qemu_remove_machine_init_done_notifier(Notifier *notify)
     notifier_remove(notify);
 }
 
+static NotifierList machine_init_done_late_notifiers =
+    NOTIFIER_LIST_INITIALIZER(machine_init_done_late_notifiers);
+
+static bool machine_init_done_late;
+
+void qemu_add_machine_init_done_late_notifier(Notifier *notify)
+{
+    notifier_list_add(&machine_init_done_late_notifiers, notify);
+    if (machine_init_done_late) {
+        notify->notify(notify, NULL);
+    }
+}
+
+void qemu_remove_machine_init_done_late_notifier(Notifier *notify)
+{
+    notifier_remove(notify);
+}
+
+
+static void qemu_run_machine_init_done_late_notifiers(void)
+{
+    machine_init_done_late = true;
+    notifier_list_notify(&machine_init_done_late_notifiers, NULL);
+}
+
 void qdev_machine_creation_done(void)
 {
     cpu_synchronize_all_post_init();
@@ -1311,6 +1336,7 @@ void qdev_machine_creation_done(void)
     if (rom_check_and_register_reset() != 0) {
         exit(1);
     }
+    qemu_run_machine_init_done_late_notifiers();
 
     replay_start();
 
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 8fae667172..d44f8cf778 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -19,6 +19,8 @@ void qemu_remove_exit_notifier(Notifier *notify);
 void qemu_run_machine_init_done_notifiers(void);
 void qemu_add_machine_init_done_notifier(Notifier *notify);
 void qemu_remove_machine_init_done_notifier(Notifier *notify);
+void qemu_add_machine_init_done_late_notifier(Notifier *notify);
+void qemu_remove_machine_init_done_late_notifier(Notifier *notify);
 
 void configure_rtc(QemuOpts *opts);
 
-- 
2.25.1