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monitor: Remove "x-oob", offer capability "oob" unconditionally 

Out-of-band command execution was introduced in commit cf869d5317.
Unfortunately, we ran into a regression, and had to turn it into an
experimental option for 2.12 (commit be933ffc23).

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

The regression has since been fixed (commit 951702f39c "monitor: bind
dispatch bh to iohandler context").  A thorough re-review of OOB
commands led to a few more issues, which have also been addressed.

This patch partly reverts be933ffc23 (monitor: new parameter "x-oob"),
and makes QMP monitors again offer capability "oob" whenever they can
provide it, i.e. when the monitor's character device is capable of
running in an I/O thread.

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

Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20181009062718.1914-4-peterx@redhat.com>
[Conflict with "monitor: check if chardev can switch gcontext for OOB"
resolved, commit message updated]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Peter Xu 2018-10-09 14:27:15 +08:00 committed by Markus Armbruster
parent 9ab84470ff
commit 8258292e18
5 changed files with 7 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/monitor/monitor.h
View File

@ -13,7 +13,6 @@ extern __thread Monitor *cur_mon;
#define MONITOR_USE_READLINE 0x02
#define MONITOR_USE_CONTROL 0x04
#define MONITOR_USE_PRETTY 0x08
#define MONITOR_USE_OOB 0x10
#define QMP_REQ_QUEUE_LEN_MAX 8

23
monitor.c
View File

@ -4567,22 +4567,12 @@ 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 (!qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_GCONTEXT)) {
error_report("Monitor out-of-band is not supported with "
"%s typed chardev backend",
object_get_typename(OBJECT(chr)));
exit(1);
}
if (use_readline) {
error_report("Monitor out-of-band is only supported by QMP");
exit(1);
}
}
monitor_data_init(mon, false, use_oob);
/* Note: we run QMP monitor in I/O thread when @chr supports that */
monitor_data_init(mon, false,
(flags & MONITOR_USE_CONTROL)
&& qemu_chr_has_feature(chr,
QEMU_CHAR_FEATURE_GCONTEXT));
qemu_chr_fe_init(&mon->chr, chr, &error_abort);
mon->flags = flags;
@ -4677,9 +4667,6 @@ QemuOptsList qemu_mon_opts = {
},{
.name = "pretty",
.type = QEMU_OPT_BOOL,
},{
.name = "x-oob",
.type = QEMU_OPT_BOOL,
},
{ /* end of list */ }
},

2
tests/libqtest.c
View File

@ -224,7 +224,7 @@ 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 ?: "");
g_test_message("starting QEMU: %s", command);

2
tests/qmp-test.c
View File

@ -116,7 +116,7 @@ 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 */

5
vl.c
View File

@ -2322,11 +2322,6 @@ 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");
if (!chardev) {
error_report("chardev is required");