qom: Create system containers explicitly

Always explicitly create QEMU system containers upfront.

Root containers will be created when trying to fetch the root object the
1st time.  They are:

  /objects
  /chardevs
  /backend

Machine sub-containers will be created only until machine is being
initialized.  They are:

  /machine/unattached
  /machine/peripheral
  /machine/peripheral-anon

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20241121192202.4155849-8-peterx@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/system/vl.c b/system/vl.c
index 09202b57e7..85fcc8f96e 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -2113,6 +2113,21 @@ static void parse_memory_options(void)
     loc_pop(&loc);
 }
 
+static const char *const machine_containers[] = {
+    "unattached",
+    "peripheral",
+    "peripheral-anon"
+};
+
+static void qemu_create_machine_containers(Object *machine)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(machine_containers); i++) {
+        object_property_add_new_container(machine, machine_containers[i]);
+    }
+}
+
 static void qemu_create_machine(QDict *qdict)
 {
     MachineClass *machine_class = select_machine(qdict, &error_fatal);
@@ -2121,6 +2136,7 @@ static void qemu_create_machine(QDict *qdict)
     current_machine = MACHINE(object_new_with_class(OBJECT_CLASS(machine_class)));
     object_property_add_child(object_get_root(), "machine",
                               OBJECT(current_machine));
+    qemu_create_machine_containers(OBJECT(current_machine));
     object_property_add_child(container_get(OBJECT(current_machine),
                                             "/unattached"),
                               "sysbus", OBJECT(sysbus_get_default()));