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qmp: Hack to keep commands configuration-specific

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We currently define QMP commands in two places: the QAPI schema and
qmp-commands.hx.  The latter is preprocessed, the former is not.  We
use the preprocessor to suppress configuration-specific commands.  For
instance, query-spice is only available #ifdef CONFIG_SPICE.

QMP command dispatch and query-commands use the qmp-commands.hx
definition, and thus obey the #ifdeffery there.  Good, because it lets
QMP clients probe for available features more easily.

query-qmp-schema uses the QAPI schema, and thus lists the
configuration-specific commands even when they're unavailable.  Not so
good.

We're about to flip command dispatch and query-commands to the
non-middle-mode command registry, which uses the QAPI schema, so we
can ditch qmp-commands.hx.  To avoid regressing query-commands,
arrange for commands that are suppressed with the preprocessor now to
be unregistered with that registry.  This will keep them unavailable
and out of query-commands when we flip command dispatch and
query-commands to that registry, exactly as before.

This is a hack.  The proper solution is to support
configuration-specific commands in the QAPI schema.  Mark it FIXME.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20160912091913.15831-8-marcandre.lureau@redhat.com>
This commit is contained in:
Marc-André Lureau 2016-09-12 13:19:02 +04:00 committed by Markus Armbruster
parent 60b03e4e6a
commit 5032a16d1d
1 changed files with 35 additions and 0 deletions
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35
monitor.c
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@ -1008,6 +1008,38 @@ static void qmp_query_qmp_schema(QDict *qdict, QObject **ret_data,
*ret_data = qobject_from_json(qmp_schema_json);
}
/*
* Note: right now, this function is never called. It will be called
* shortly when we stop using QAPI 'middle mode'. The rest of this
* comment is written as if that was the case already.
*
* We used to define commands in qmp-commands.hx in addition to the
* QAPI schema. This permitted defining some of them only in certain
* configurations. query-commands has always reflected that (good,
* because it lets QMP clients figure out what's actually available),
* while query-qmp-schema never did (not so good). This function is a
* hack to keep the configuration-specific commands defined exactly as
* before, even though qmp-commands.hx is gone.
*
* FIXME Educate the QAPI schema on configuration-specific commands,
* and drop this hack.
*/
static void qmp_unregister_commands_hack(void)
{
#ifndef CONFIG_SPICE
qmp_unregister_command("query-spice");
#endif
#ifndef TARGET_I386
qmp_unregister_command("rtc-reset-reinjection");
#endif
#ifndef TARGET_S390X
qmp_unregister_command("dump-skeys");
#endif
#ifndef TARGET_ARM
qmp_unregister_command("query-gic-capabilities");
#endif
}
static void qmp_init_marshal(void)
{
qmp_register_command("query-qmp-schema", qmp_query_qmp_schema,
@ -1016,6 +1048,9 @@ static void qmp_init_marshal(void)
QCO_NO_OPTIONS);
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);
}
qapi_init(qmp_init_marshal);