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monitor: new parameter "x-oob" 

Add new parameter to optionally enable Out-Of-Band for a QMP server.

An example command line:

  ./qemu-system-x86_64 -chardev stdio,id=char0 \
                       -mon chardev=char0,mode=control,x-oob=on

By default, Out-Of-Band is off.

It is not allowed if either MUX or non-QMP is detected, since
Out-Of-Band is currently only for QMP, and non-MUX chardev backends.

Note that the client STILL has to request 'oob' during qmp_capabilities;
in part because the x-oob command line option may disappear in the
future if we decide the capabilities negotiation is sufficient.

Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180326063901.27425-4-peterx@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
[eblake: enhance commit message]
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Peter Xu 2018-03-26 14:38:56 +08:00 committed by Eric Blake
parent 6d2d563f8c
commit be933ffc23
3 changed files with 26 additions and 2 deletions
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1
include/monitor/monitor.h
View File

@ -13,6 +13,7 @@ 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);

22
monitor.c
View File

@ -36,6 +36,7 @@
#include "net/slirp.h"
#include "chardev/char-fe.h"
#include "chardev/char-io.h"
#include "chardev/char-mux.h"
#include "ui/qemu-spice.h"
#include "sysemu/numa.h"
#include "monitor/monitor.h"
@ -4562,12 +4563,26 @@ static void monitor_qmp_setup_handlers_bh(void *opaque)
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;
monitor_data_init(mon, false, false);
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);
}
}
monitor_data_init(mon, false, use_oob);
qemu_chr_fe_init(&mon->chr, chr, &error_abort);
mon->flags = flags;
if (flags & MONITOR_USE_READLINE) {
if (use_readline) {
mon->rs = readline_init(monitor_readline_printf,
monitor_readline_flush,
mon,
@ -4663,6 +4678,9 @@ QemuOptsList qemu_mon_opts = {
},{
.name = "pretty",
.type = QEMU_OPT_BOOL,
},{
.name = "x-oob",
.type = QEMU_OPT_BOOL,
},
{ /* end of list */ }
},

5
vl.c
View File

@ -2404,6 +2404,11 @@ 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) {