qmp: Redo how the client requests out-of-band execution

Commit cf869d53172 "qmp: support out-of-band (oob) execution" added a
general mechanism for command-independent arguments just for an
out-of-band flag:

    The "control" key is introduced to store this extra flag.  "control"
    field is used to store arguments that are shared by all the commands,
    rather than command specific arguments.  Let "run-oob" be the first.

However, it failed to reject unknown members of "control".  For
instance, in QMP command

    {"execute": "query-name", "id": 42, "control": {"crap": true}}

"crap" gets silently ignored.

Instead of fixing this, revert the general "control" mechanism
(because YAGNI), and do it the way I initially proposed, with key
"exec-oob".  Simpler code, simpler interface.

An out-of-band command

    {"execute": "migrate-pause", "id": 42, "control": {"run-oob": true}}

becomes

    {"exec-oob": "migrate-pause", "id": 42}

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180703085358.13941-13-armbru@redhat.com>
[Commit message typo fixed]

1 files changed, 2 insertions, 5 deletions

diff --git a/tests/qmp-test.c b/tests/qmp-test.c
index c9d01b8..a7b6ec9 100644
--- a/tests/qmp-test.c
+++ b/tests/qmp-test.c
@@ -176,8 +176,7 @@ static void unblock_blocked_cmd(void)
 
 static void send_oob_cmd_that_fails(QTestState *s, const char *id)
 {
-    qtest_async_qmp(s, "{ 'execute': 'migrate-pause', 'id': %s,"
-                    "  'control': { 'run-oob': true } }", id);
+    qtest_async_qmp(s, "{ 'exec-oob': 'migrate-pause', 'id': %s }", id);
 }
 
 static void recv_cmd_id(QTestState *s, const char *id)
@@ -229,9 +228,7 @@ static void test_qmp_oob(void)
      * Try any command that does not support OOB but with OOB flag. We
      * should get failure.
      */
-    resp = qtest_qmp(qts,
-                     "{ 'execute': 'query-cpus',"
-                     "  'control': { 'run-oob': true } }");
+    resp = qtest_qmp(qts, "{ 'exec-oob': 'query-cpus' }");
     g_assert(qdict_haskey(resp, "error"));
     qobject_unref(resp);