From 05875687806b71ae980ca59a46777b742b20ac06 Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Fri, 3 Mar 2017 13:32:24 +0100 Subject: 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 Reviewed-by: Eric Blake Message-Id: <1488544368-30622-5-git-send-email-armbru@redhat.com> --- include/monitor/monitor.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/monitor') diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h index e64b944d7c..d2b3aafdb4 100644 --- a/include/monitor/monitor.h +++ b/include/monitor/monitor.h @@ -16,6 +16,7 @@ extern Monitor *cur_mon; bool monitor_cur_is_qmp(void); +void monitor_init_qmp_commands(void); void monitor_init(Chardev *chr, int flags); void monitor_cleanup(void); -- cgit v1.2.3