qmp: Dumb down how we run QMP command registration

The way we get QMP commands registered is high tech:

* qapi-commands.py generates qmp_init_marshal() that does the actual work

* it also generates the magic to register it as a MODULE_INIT_QAPI
  function, so it runs when someone calls
  module_call_init(MODULE_INIT_QAPI)

* main() calls module_call_init()

QEMU needs to register a few non-qapified commands.  Same high tech
works: monitor.c has its own qmp_init_marshal() along with the magic
to make it run in module_call_init(MODULE_INIT_QAPI).

QEMU also needs to unregister commands that are not wanted in this
build's configuration (commit 5032a16).  Simple enough:
qmp_unregister_commands_hack().  The difficulty is to make it run
after the generated qmp_init_marshal().  We can't simply run it in
monitor.c's qmp_init_marshal(), because the order in which the
registered functions run is indeterminate.  So qmp_init_marshal()
registers qmp_unregister_commands_hack() separately.  Since
registering *appends* to the list of registered functions, this will
make it run after all the functions that have been registered already.

I suspect it takes a long and expensive computer science education to
not find this silly.

Dumb it down as follows:

* Drop MODULE_INIT_QAPI entirely

* Give the generated qmp_init_marshal() external linkage.

* Call it instead of module_call_init(MODULE_INIT_QAPI)

* Except in QEMU proper, call new monitor_init_qmp_commands() that in
  turn calls the generated qmp_init_marshal(), registers the
  additional commands and unregisters the unwanted ones.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1488544368-30622-5-git-send-email-armbru@redhat.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/monitor.c b/monitor.c
index b68944d93c..53f5f5a378 100644
--- a/monitor.c
+++ b/monitor.c
@@ -997,8 +997,10 @@ static void qmp_unregister_commands_hack(void)
 #endif
 }
 
-static void qmp_init_marshal(void)
+void monitor_init_qmp_commands(void)
 {
+    qmp_init_marshal();
+
     qmp_register_command("query-qmp-schema", qmp_query_qmp_schema,
                          QCO_NO_OPTIONS);
     qmp_register_command("device_add", qmp_device_add,
@@ -1006,12 +1008,9 @@ static void qmp_init_marshal(void)
     qmp_register_command("netdev_add", qmp_netdev_add,
                          QCO_NO_OPTIONS);
 
-    /* call it after the rest of qapi_init() */
-    register_module_init(qmp_unregister_commands_hack, MODULE_INIT_QAPI);
+    qmp_unregister_commands_hack();
 }
 
-qapi_init(qmp_init_marshal);
-
 /* set the current CPU defined by the user */
 int monitor_set_cpu(int cpu_index)
 {