[Qemu-devel] [PATCH v3 5/6] monitor: remove "x-oob", turn oob on by default

[Peter Xu <peterx@redhat.com>]

There was a regression reported by Eric Auger before with OOB:

  http://lists.gnu.org/archive/html/qemu-devel/2018-03/msg06231.html

It is fixed in 951702f39c ("monitor: bind dispatch bh to iohandler
context", 2018-04-10).

For the bug, we turned Out-Of-Band feature of monitors off for 2.12
release.  Now we turn that on again after the 2.12 release.

This patch partly reverts be933ffc23 (monitor: new parameter "x-oob"),
meanwhile turn it on again by default for non-MUX QMPs.  Note that we
can't enable Out-Of-Band for monitors with MUX-typed chardev backends,
because not all the chardev frontends can run without main thread, or
can run in multiple threads.

Some trivial touch-up in the test code is required to make sure qmp-test
won't broke.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 include/monitor/monitor.h |  1 -
 monitor.c                 | 17 +----------------
 tests/libqtest.c          |  2 +-
 tests/qmp-test.c          |  2 +-
 vl.c                      |  5 -----
 5 files changed, 3 insertions(+), 24 deletions(-)

diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
index d6ab70cae2..0cb0538a31 100644
--- a/include/monitor/monitor.h
+++ b/include/monitor/monitor.h
@@ -13,7 +13,6 @@ extern Monitor *cur_mon;
 #define MONITOR_USE_READLINE  0x02
 #define MONITOR_USE_CONTROL   0x04
 #define MONITOR_USE_PRETTY    0x08
-#define MONITOR_USE_OOB       0x10
 
 bool monitor_cur_is_qmp(void);
 
diff --git a/monitor.c b/monitor.c
index e59d4f09ac..860c9588b7 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4582,19 +4582,7 @@ void monitor_init(Chardev *chr, int flags)
 {
     Monitor *mon = g_malloc(sizeof(*mon));
     bool use_readline = flags & MONITOR_USE_READLINE;
-    bool use_oob = flags & MONITOR_USE_OOB;
-
-    if (use_oob) {
-        if (CHARDEV_IS_MUX(chr)) {
-            error_report("Monitor Out-Of-Band is not supported with "
-                         "MUX typed chardev backend");
-            exit(1);
-        }
-        if (use_readline) {
-            error_report("Monitor Out-Of-band is only supported by QMP");
-            exit(1);
-        }
-    }
+    bool use_oob = (flags & MONITOR_USE_CONTROL) && !CHARDEV_IS_MUX(chr);
 
     monitor_data_init(mon, false, use_oob);
 
@@ -4696,9 +4684,6 @@ QemuOptsList qemu_mon_opts = {
         },{
             .name = "pretty",
             .type = QEMU_OPT_BOOL,
-        },{
-            .name = "x-oob",
-            .type = QEMU_OPT_BOOL,
         },
         { /* end of list */ }
     },
diff --git a/tests/libqtest.c b/tests/libqtest.c
index 098af6aec4..c5cb3f925c 100644
--- a/tests/libqtest.c
+++ b/tests/libqtest.c
@@ -213,7 +213,7 @@ QTestState *qtest_init_without_qmp_handshake(bool use_oob,
                                   "-display none "
                                   "%s", qemu_binary, socket_path,
                                   getenv("QTEST_LOG") ? "/dev/fd/2" : "/dev/null",
-                                  qmp_socket_path, use_oob ? ",x-oob=on" : "",
+                                  qmp_socket_path, "",
                                   extra_args ?: "");
         execlp("/bin/sh", "sh", "-c", command, NULL);
         exit(1);
diff --git a/tests/qmp-test.c b/tests/qmp-test.c
index a49cbc6fde..3747bf7fbb 100644
--- a/tests/qmp-test.c
+++ b/tests/qmp-test.c
@@ -89,7 +89,7 @@ static void test_qmp_protocol(void)
     g_assert(q);
     test_version(qdict_get(q, "version"));
     capabilities = qdict_get_qlist(q, "capabilities");
-    g_assert(capabilities && qlist_empty(capabilities));
+    g_assert(capabilities);
     qobject_unref(resp);
 
     /* Test valid command before handshake */
diff --git a/vl.c b/vl.c
index 6e34fb348d..26a0bb3f0f 100644
--- a/vl.c
+++ b/vl.c
@@ -2307,11 +2307,6 @@ static int mon_init_func(void *opaque, QemuOpts *opts, Error **errp)
     if (qemu_opt_get_bool(opts, "pretty", 0))
         flags |= MONITOR_USE_PRETTY;
 
-    /* OOB is off by default */
-    if (qemu_opt_get_bool(opts, "x-oob", 0)) {
-        flags |= MONITOR_USE_OOB;
-    }
-
     chardev = qemu_opt_get(opts, "chardev");
     chr = qemu_chr_find(chardev);
     if (chr == NULL) {
-- 
2.17.1