mirror of
https://github.com/qemu/qemu.git
synced 2024-12-12 13:13:51 +08:00
20076f4a8c
GString has a richer set of string operations than QString. It should be preferred to QString except where we need a QObject or reference counting. We don't here. Switch to GString, and put its richer interface to use. Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20201211171152.146877-3-armbru@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
770 lines
21 KiB
C
770 lines
21 KiB
C
/*
|
|
* QEMU monitor
|
|
*
|
|
* Copyright (c) 2003-2004 Fabrice Bellard
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "monitor-internal.h"
|
|
#include "qapi/error.h"
|
|
#include "qapi/opts-visitor.h"
|
|
#include "qapi/qapi-emit-events.h"
|
|
#include "qapi/qapi-visit-control.h"
|
|
#include "qapi/qmp/qdict.h"
|
|
#include "qemu/error-report.h"
|
|
#include "qemu/option.h"
|
|
#include "sysemu/qtest.h"
|
|
#include "sysemu/sysemu.h"
|
|
#include "trace.h"
|
|
|
|
/*
|
|
* To prevent flooding clients, events can be throttled. The
|
|
* throttling is calculated globally, rather than per-Monitor
|
|
* instance.
|
|
*/
|
|
typedef struct MonitorQAPIEventState {
|
|
QAPIEvent event; /* Throttling state for this event type and... */
|
|
QDict *data; /* ... data, see qapi_event_throttle_equal() */
|
|
QEMUTimer *timer; /* Timer for handling delayed events */
|
|
QDict *qdict; /* Delayed event (if any) */
|
|
} MonitorQAPIEventState;
|
|
|
|
typedef struct {
|
|
int64_t rate; /* Minimum time (in ns) between two events */
|
|
} MonitorQAPIEventConf;
|
|
|
|
/* Shared monitor I/O thread */
|
|
IOThread *mon_iothread;
|
|
|
|
/* Coroutine to dispatch the requests received from I/O thread */
|
|
Coroutine *qmp_dispatcher_co;
|
|
|
|
/* Set to true when the dispatcher coroutine should terminate */
|
|
bool qmp_dispatcher_co_shutdown;
|
|
|
|
/*
|
|
* qmp_dispatcher_co_busy is used for synchronisation between the
|
|
* monitor thread and the main thread to ensure that the dispatcher
|
|
* coroutine never gets scheduled a second time when it's already
|
|
* scheduled (scheduling the same coroutine twice is forbidden).
|
|
*
|
|
* It is true if the coroutine is active and processing requests.
|
|
* Additional requests may then be pushed onto mon->qmp_requests,
|
|
* and @qmp_dispatcher_co_shutdown may be set without further ado.
|
|
* @qmp_dispatcher_co_busy must not be woken up in this case.
|
|
*
|
|
* If false, you also have to set @qmp_dispatcher_co_busy to true and
|
|
* wake up @qmp_dispatcher_co after pushing the new requests.
|
|
*
|
|
* The coroutine will automatically change this variable back to false
|
|
* before it yields. Nobody else may set the variable to false.
|
|
*
|
|
* Access must be atomic for thread safety.
|
|
*/
|
|
bool qmp_dispatcher_co_busy;
|
|
|
|
/*
|
|
* Protects mon_list, monitor_qapi_event_state, coroutine_mon,
|
|
* monitor_destroyed.
|
|
*/
|
|
QemuMutex monitor_lock;
|
|
static GHashTable *monitor_qapi_event_state;
|
|
static GHashTable *coroutine_mon; /* Maps Coroutine* to Monitor* */
|
|
|
|
MonitorList mon_list;
|
|
int mon_refcount;
|
|
static bool monitor_destroyed;
|
|
|
|
Monitor *monitor_cur(void)
|
|
{
|
|
Monitor *mon;
|
|
|
|
qemu_mutex_lock(&monitor_lock);
|
|
mon = g_hash_table_lookup(coroutine_mon, qemu_coroutine_self());
|
|
qemu_mutex_unlock(&monitor_lock);
|
|
|
|
return mon;
|
|
}
|
|
|
|
/**
|
|
* Sets a new current monitor and returns the old one.
|
|
*
|
|
* If a non-NULL monitor is set for a coroutine, another call
|
|
* resetting it to NULL is required before the coroutine terminates,
|
|
* otherwise a stale entry would remain in the hash table.
|
|
*/
|
|
Monitor *monitor_set_cur(Coroutine *co, Monitor *mon)
|
|
{
|
|
Monitor *old_monitor = monitor_cur();
|
|
|
|
qemu_mutex_lock(&monitor_lock);
|
|
if (mon) {
|
|
g_hash_table_replace(coroutine_mon, co, mon);
|
|
} else {
|
|
g_hash_table_remove(coroutine_mon, co);
|
|
}
|
|
qemu_mutex_unlock(&monitor_lock);
|
|
|
|
return old_monitor;
|
|
}
|
|
|
|
/**
|
|
* Is the current monitor, if any, a QMP monitor?
|
|
*/
|
|
bool monitor_cur_is_qmp(void)
|
|
{
|
|
Monitor *cur_mon = monitor_cur();
|
|
|
|
return cur_mon && monitor_is_qmp(cur_mon);
|
|
}
|
|
|
|
/**
|
|
* Is @mon is using readline?
|
|
* Note: not all HMP monitors use readline, e.g., gdbserver has a
|
|
* non-interactive HMP monitor, so readline is not used there.
|
|
*/
|
|
static inline bool monitor_uses_readline(const MonitorHMP *mon)
|
|
{
|
|
return mon->use_readline;
|
|
}
|
|
|
|
static inline bool monitor_is_hmp_non_interactive(const Monitor *mon)
|
|
{
|
|
if (monitor_is_qmp(mon)) {
|
|
return false;
|
|
}
|
|
|
|
return !monitor_uses_readline(container_of(mon, MonitorHMP, common));
|
|
}
|
|
|
|
static void monitor_flush_locked(Monitor *mon);
|
|
|
|
static gboolean monitor_unblocked(GIOChannel *chan, GIOCondition cond,
|
|
void *opaque)
|
|
{
|
|
Monitor *mon = opaque;
|
|
|
|
qemu_mutex_lock(&mon->mon_lock);
|
|
mon->out_watch = 0;
|
|
monitor_flush_locked(mon);
|
|
qemu_mutex_unlock(&mon->mon_lock);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Caller must hold mon->mon_lock */
|
|
static void monitor_flush_locked(Monitor *mon)
|
|
{
|
|
int rc;
|
|
size_t len;
|
|
const char *buf;
|
|
|
|
if (mon->skip_flush) {
|
|
return;
|
|
}
|
|
|
|
buf = mon->outbuf->str;
|
|
len = mon->outbuf->len;
|
|
|
|
if (len && !mon->mux_out) {
|
|
rc = qemu_chr_fe_write(&mon->chr, (const uint8_t *) buf, len);
|
|
if ((rc < 0 && errno != EAGAIN) || (rc == len)) {
|
|
/* all flushed or error */
|
|
g_string_truncate(mon->outbuf, 0);
|
|
return;
|
|
}
|
|
if (rc > 0) {
|
|
/* partial write */
|
|
g_string_erase(mon->outbuf, 0, rc);
|
|
}
|
|
if (mon->out_watch == 0) {
|
|
mon->out_watch =
|
|
qemu_chr_fe_add_watch(&mon->chr, G_IO_OUT | G_IO_HUP,
|
|
monitor_unblocked, mon);
|
|
}
|
|
}
|
|
}
|
|
|
|
void monitor_flush(Monitor *mon)
|
|
{
|
|
qemu_mutex_lock(&mon->mon_lock);
|
|
monitor_flush_locked(mon);
|
|
qemu_mutex_unlock(&mon->mon_lock);
|
|
}
|
|
|
|
/* flush at every end of line */
|
|
int monitor_puts(Monitor *mon, const char *str)
|
|
{
|
|
int i;
|
|
char c;
|
|
|
|
qemu_mutex_lock(&mon->mon_lock);
|
|
for (i = 0; str[i]; i++) {
|
|
c = str[i];
|
|
if (c == '\n') {
|
|
g_string_append_c(mon->outbuf, '\r');
|
|
}
|
|
g_string_append_c(mon->outbuf, c);
|
|
if (c == '\n') {
|
|
monitor_flush_locked(mon);
|
|
}
|
|
}
|
|
qemu_mutex_unlock(&mon->mon_lock);
|
|
|
|
return i;
|
|
}
|
|
|
|
int monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
|
|
{
|
|
char *buf;
|
|
int n;
|
|
|
|
if (!mon) {
|
|
return -1;
|
|
}
|
|
|
|
if (monitor_is_qmp(mon)) {
|
|
return -1;
|
|
}
|
|
|
|
buf = g_strdup_vprintf(fmt, ap);
|
|
n = monitor_puts(mon, buf);
|
|
g_free(buf);
|
|
return n;
|
|
}
|
|
|
|
int monitor_printf(Monitor *mon, const char *fmt, ...)
|
|
{
|
|
int ret;
|
|
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
ret = monitor_vprintf(mon, fmt, ap);
|
|
va_end(ap);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Print to current monitor if we have one, else to stderr.
|
|
*/
|
|
int error_vprintf(const char *fmt, va_list ap)
|
|
{
|
|
Monitor *cur_mon = monitor_cur();
|
|
|
|
if (cur_mon && !monitor_cur_is_qmp()) {
|
|
return monitor_vprintf(cur_mon, fmt, ap);
|
|
}
|
|
return vfprintf(stderr, fmt, ap);
|
|
}
|
|
|
|
int error_vprintf_unless_qmp(const char *fmt, va_list ap)
|
|
{
|
|
Monitor *cur_mon = monitor_cur();
|
|
|
|
if (!cur_mon) {
|
|
return vfprintf(stderr, fmt, ap);
|
|
}
|
|
if (!monitor_cur_is_qmp()) {
|
|
return monitor_vprintf(cur_mon, fmt, ap);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
static MonitorQAPIEventConf monitor_qapi_event_conf[QAPI_EVENT__MAX] = {
|
|
/* Limit guest-triggerable events to 1 per second */
|
|
[QAPI_EVENT_RTC_CHANGE] = { 1000 * SCALE_MS },
|
|
[QAPI_EVENT_WATCHDOG] = { 1000 * SCALE_MS },
|
|
[QAPI_EVENT_BALLOON_CHANGE] = { 1000 * SCALE_MS },
|
|
[QAPI_EVENT_QUORUM_REPORT_BAD] = { 1000 * SCALE_MS },
|
|
[QAPI_EVENT_QUORUM_FAILURE] = { 1000 * SCALE_MS },
|
|
[QAPI_EVENT_VSERPORT_CHANGE] = { 1000 * SCALE_MS },
|
|
[QAPI_EVENT_MEMORY_DEVICE_SIZE_CHANGE] = { 1000 * SCALE_MS },
|
|
};
|
|
|
|
/*
|
|
* Return the clock to use for recording an event's time.
|
|
* It's QEMU_CLOCK_REALTIME, except for qtests it's
|
|
* QEMU_CLOCK_VIRTUAL, to support testing rate limits.
|
|
* Beware: result is invalid before configure_accelerator().
|
|
*/
|
|
static inline QEMUClockType monitor_get_event_clock(void)
|
|
{
|
|
return qtest_enabled() ? QEMU_CLOCK_VIRTUAL : QEMU_CLOCK_REALTIME;
|
|
}
|
|
|
|
/*
|
|
* Broadcast an event to all monitors.
|
|
* @qdict is the event object. Its member "event" must match @event.
|
|
* Caller must hold monitor_lock.
|
|
*/
|
|
static void monitor_qapi_event_emit(QAPIEvent event, QDict *qdict)
|
|
{
|
|
Monitor *mon;
|
|
MonitorQMP *qmp_mon;
|
|
|
|
trace_monitor_protocol_event_emit(event, qdict);
|
|
QTAILQ_FOREACH(mon, &mon_list, entry) {
|
|
if (!monitor_is_qmp(mon)) {
|
|
continue;
|
|
}
|
|
|
|
qmp_mon = container_of(mon, MonitorQMP, common);
|
|
if (qmp_mon->commands != &qmp_cap_negotiation_commands) {
|
|
qmp_send_response(qmp_mon, qdict);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void monitor_qapi_event_handler(void *opaque);
|
|
|
|
/*
|
|
* Queue a new event for emission to Monitor instances,
|
|
* applying any rate limiting if required.
|
|
*/
|
|
static void
|
|
monitor_qapi_event_queue_no_reenter(QAPIEvent event, QDict *qdict)
|
|
{
|
|
MonitorQAPIEventConf *evconf;
|
|
MonitorQAPIEventState *evstate;
|
|
|
|
assert(event < QAPI_EVENT__MAX);
|
|
evconf = &monitor_qapi_event_conf[event];
|
|
trace_monitor_protocol_event_queue(event, qdict, evconf->rate);
|
|
|
|
qemu_mutex_lock(&monitor_lock);
|
|
|
|
if (!evconf->rate) {
|
|
/* Unthrottled event */
|
|
monitor_qapi_event_emit(event, qdict);
|
|
} else {
|
|
QDict *data = qobject_to(QDict, qdict_get(qdict, "data"));
|
|
MonitorQAPIEventState key = { .event = event, .data = data };
|
|
|
|
evstate = g_hash_table_lookup(monitor_qapi_event_state, &key);
|
|
assert(!evstate || timer_pending(evstate->timer));
|
|
|
|
if (evstate) {
|
|
/*
|
|
* Timer is pending for (at least) evconf->rate ns after
|
|
* last send. Store event for sending when timer fires,
|
|
* replacing a prior stored event if any.
|
|
*/
|
|
qobject_unref(evstate->qdict);
|
|
evstate->qdict = qobject_ref(qdict);
|
|
} else {
|
|
/*
|
|
* Last send was (at least) evconf->rate ns ago.
|
|
* Send immediately, and arm the timer to call
|
|
* monitor_qapi_event_handler() in evconf->rate ns. Any
|
|
* events arriving before then will be delayed until then.
|
|
*/
|
|
int64_t now = qemu_clock_get_ns(monitor_get_event_clock());
|
|
|
|
monitor_qapi_event_emit(event, qdict);
|
|
|
|
evstate = g_new(MonitorQAPIEventState, 1);
|
|
evstate->event = event;
|
|
evstate->data = qobject_ref(data);
|
|
evstate->qdict = NULL;
|
|
evstate->timer = timer_new_ns(monitor_get_event_clock(),
|
|
monitor_qapi_event_handler,
|
|
evstate);
|
|
g_hash_table_add(monitor_qapi_event_state, evstate);
|
|
timer_mod_ns(evstate->timer, now + evconf->rate);
|
|
}
|
|
}
|
|
|
|
qemu_mutex_unlock(&monitor_lock);
|
|
}
|
|
|
|
void qapi_event_emit(QAPIEvent event, QDict *qdict)
|
|
{
|
|
/*
|
|
* monitor_qapi_event_queue_no_reenter() is not reentrant: it
|
|
* would deadlock on monitor_lock. Work around by queueing
|
|
* events in thread-local storage.
|
|
* TODO: remove this, make it re-enter safe.
|
|
*/
|
|
typedef struct MonitorQapiEvent {
|
|
QAPIEvent event;
|
|
QDict *qdict;
|
|
QSIMPLEQ_ENTRY(MonitorQapiEvent) entry;
|
|
} MonitorQapiEvent;
|
|
static __thread QSIMPLEQ_HEAD(, MonitorQapiEvent) event_queue;
|
|
static __thread bool reentered;
|
|
MonitorQapiEvent *ev;
|
|
|
|
if (!reentered) {
|
|
QSIMPLEQ_INIT(&event_queue);
|
|
}
|
|
|
|
ev = g_new(MonitorQapiEvent, 1);
|
|
ev->qdict = qobject_ref(qdict);
|
|
ev->event = event;
|
|
QSIMPLEQ_INSERT_TAIL(&event_queue, ev, entry);
|
|
if (reentered) {
|
|
return;
|
|
}
|
|
|
|
reentered = true;
|
|
|
|
while ((ev = QSIMPLEQ_FIRST(&event_queue)) != NULL) {
|
|
QSIMPLEQ_REMOVE_HEAD(&event_queue, entry);
|
|
monitor_qapi_event_queue_no_reenter(ev->event, ev->qdict);
|
|
qobject_unref(ev->qdict);
|
|
g_free(ev);
|
|
}
|
|
|
|
reentered = false;
|
|
}
|
|
|
|
/*
|
|
* This function runs evconf->rate ns after sending a throttled
|
|
* event.
|
|
* If another event has since been stored, send it.
|
|
*/
|
|
static void monitor_qapi_event_handler(void *opaque)
|
|
{
|
|
MonitorQAPIEventState *evstate = opaque;
|
|
MonitorQAPIEventConf *evconf = &monitor_qapi_event_conf[evstate->event];
|
|
|
|
trace_monitor_protocol_event_handler(evstate->event, evstate->qdict);
|
|
qemu_mutex_lock(&monitor_lock);
|
|
|
|
if (evstate->qdict) {
|
|
int64_t now = qemu_clock_get_ns(monitor_get_event_clock());
|
|
|
|
monitor_qapi_event_emit(evstate->event, evstate->qdict);
|
|
qobject_unref(evstate->qdict);
|
|
evstate->qdict = NULL;
|
|
timer_mod_ns(evstate->timer, now + evconf->rate);
|
|
} else {
|
|
g_hash_table_remove(monitor_qapi_event_state, evstate);
|
|
qobject_unref(evstate->data);
|
|
timer_free(evstate->timer);
|
|
g_free(evstate);
|
|
}
|
|
|
|
qemu_mutex_unlock(&monitor_lock);
|
|
}
|
|
|
|
static unsigned int qapi_event_throttle_hash(const void *key)
|
|
{
|
|
const MonitorQAPIEventState *evstate = key;
|
|
unsigned int hash = evstate->event * 255;
|
|
|
|
if (evstate->event == QAPI_EVENT_VSERPORT_CHANGE) {
|
|
hash += g_str_hash(qdict_get_str(evstate->data, "id"));
|
|
}
|
|
|
|
if (evstate->event == QAPI_EVENT_QUORUM_REPORT_BAD) {
|
|
hash += g_str_hash(qdict_get_str(evstate->data, "node-name"));
|
|
}
|
|
|
|
return hash;
|
|
}
|
|
|
|
static gboolean qapi_event_throttle_equal(const void *a, const void *b)
|
|
{
|
|
const MonitorQAPIEventState *eva = a;
|
|
const MonitorQAPIEventState *evb = b;
|
|
|
|
if (eva->event != evb->event) {
|
|
return FALSE;
|
|
}
|
|
|
|
if (eva->event == QAPI_EVENT_VSERPORT_CHANGE) {
|
|
return !strcmp(qdict_get_str(eva->data, "id"),
|
|
qdict_get_str(evb->data, "id"));
|
|
}
|
|
|
|
if (eva->event == QAPI_EVENT_QUORUM_REPORT_BAD) {
|
|
return !strcmp(qdict_get_str(eva->data, "node-name"),
|
|
qdict_get_str(evb->data, "node-name"));
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
int monitor_suspend(Monitor *mon)
|
|
{
|
|
if (monitor_is_hmp_non_interactive(mon)) {
|
|
return -ENOTTY;
|
|
}
|
|
|
|
qatomic_inc(&mon->suspend_cnt);
|
|
|
|
if (mon->use_io_thread) {
|
|
/*
|
|
* Kick I/O thread to make sure this takes effect. It'll be
|
|
* evaluated again in prepare() of the watch object.
|
|
*/
|
|
aio_notify(iothread_get_aio_context(mon_iothread));
|
|
}
|
|
|
|
trace_monitor_suspend(mon, 1);
|
|
return 0;
|
|
}
|
|
|
|
static void monitor_accept_input(void *opaque)
|
|
{
|
|
Monitor *mon = opaque;
|
|
|
|
qemu_chr_fe_accept_input(&mon->chr);
|
|
}
|
|
|
|
void monitor_resume(Monitor *mon)
|
|
{
|
|
if (monitor_is_hmp_non_interactive(mon)) {
|
|
return;
|
|
}
|
|
|
|
if (qatomic_dec_fetch(&mon->suspend_cnt) == 0) {
|
|
AioContext *ctx;
|
|
|
|
if (mon->use_io_thread) {
|
|
ctx = iothread_get_aio_context(mon_iothread);
|
|
} else {
|
|
ctx = qemu_get_aio_context();
|
|
}
|
|
|
|
if (!monitor_is_qmp(mon)) {
|
|
MonitorHMP *hmp_mon = container_of(mon, MonitorHMP, common);
|
|
assert(hmp_mon->rs);
|
|
readline_show_prompt(hmp_mon->rs);
|
|
}
|
|
|
|
aio_bh_schedule_oneshot(ctx, monitor_accept_input, mon);
|
|
}
|
|
|
|
trace_monitor_suspend(mon, -1);
|
|
}
|
|
|
|
int monitor_can_read(void *opaque)
|
|
{
|
|
Monitor *mon = opaque;
|
|
|
|
return !qatomic_mb_read(&mon->suspend_cnt);
|
|
}
|
|
|
|
void monitor_list_append(Monitor *mon)
|
|
{
|
|
qemu_mutex_lock(&monitor_lock);
|
|
/*
|
|
* This prevents inserting new monitors during monitor_cleanup().
|
|
* A cleaner solution would involve the main thread telling other
|
|
* threads to terminate, waiting for their termination.
|
|
*/
|
|
if (!monitor_destroyed) {
|
|
QTAILQ_INSERT_HEAD(&mon_list, mon, entry);
|
|
mon = NULL;
|
|
}
|
|
qemu_mutex_unlock(&monitor_lock);
|
|
|
|
if (mon) {
|
|
monitor_data_destroy(mon);
|
|
g_free(mon);
|
|
}
|
|
}
|
|
|
|
static void monitor_iothread_init(void)
|
|
{
|
|
mon_iothread = iothread_create("mon_iothread", &error_abort);
|
|
}
|
|
|
|
void monitor_data_init(Monitor *mon, bool is_qmp, bool skip_flush,
|
|
bool use_io_thread)
|
|
{
|
|
if (use_io_thread && !mon_iothread) {
|
|
monitor_iothread_init();
|
|
}
|
|
qemu_mutex_init(&mon->mon_lock);
|
|
mon->is_qmp = is_qmp;
|
|
mon->outbuf = g_string_new(NULL);
|
|
mon->skip_flush = skip_flush;
|
|
mon->use_io_thread = use_io_thread;
|
|
}
|
|
|
|
void monitor_data_destroy(Monitor *mon)
|
|
{
|
|
g_free(mon->mon_cpu_path);
|
|
qemu_chr_fe_deinit(&mon->chr, false);
|
|
if (monitor_is_qmp(mon)) {
|
|
monitor_data_destroy_qmp(container_of(mon, MonitorQMP, common));
|
|
} else {
|
|
readline_free(container_of(mon, MonitorHMP, common)->rs);
|
|
}
|
|
g_string_free(mon->outbuf, true);
|
|
qemu_mutex_destroy(&mon->mon_lock);
|
|
}
|
|
|
|
void monitor_cleanup(void)
|
|
{
|
|
/*
|
|
* We need to explicitly stop the I/O thread (but not destroy it),
|
|
* clean up the monitor resources, then destroy the I/O thread since
|
|
* we need to unregister from chardev below in
|
|
* monitor_data_destroy(), and chardev is not thread-safe yet
|
|
*/
|
|
if (mon_iothread) {
|
|
iothread_stop(mon_iothread);
|
|
}
|
|
|
|
/*
|
|
* The dispatcher needs to stop before destroying the monitor and
|
|
* the I/O thread.
|
|
*
|
|
* We need to poll both qemu_aio_context and iohandler_ctx to make
|
|
* sure that the dispatcher coroutine keeps making progress and
|
|
* eventually terminates. qemu_aio_context is automatically
|
|
* polled by calling AIO_WAIT_WHILE on it, but we must poll
|
|
* iohandler_ctx manually.
|
|
*/
|
|
qmp_dispatcher_co_shutdown = true;
|
|
if (!qatomic_xchg(&qmp_dispatcher_co_busy, true)) {
|
|
aio_co_wake(qmp_dispatcher_co);
|
|
}
|
|
|
|
AIO_WAIT_WHILE(qemu_get_aio_context(),
|
|
(aio_poll(iohandler_get_aio_context(), false),
|
|
qatomic_mb_read(&qmp_dispatcher_co_busy)));
|
|
|
|
/* Flush output buffers and destroy monitors */
|
|
qemu_mutex_lock(&monitor_lock);
|
|
monitor_destroyed = true;
|
|
while (!QTAILQ_EMPTY(&mon_list)) {
|
|
Monitor *mon = QTAILQ_FIRST(&mon_list);
|
|
QTAILQ_REMOVE(&mon_list, mon, entry);
|
|
/* Permit QAPI event emission from character frontend release */
|
|
qemu_mutex_unlock(&monitor_lock);
|
|
monitor_flush(mon);
|
|
monitor_data_destroy(mon);
|
|
qemu_mutex_lock(&monitor_lock);
|
|
g_free(mon);
|
|
}
|
|
qemu_mutex_unlock(&monitor_lock);
|
|
|
|
if (mon_iothread) {
|
|
iothread_destroy(mon_iothread);
|
|
mon_iothread = NULL;
|
|
}
|
|
}
|
|
|
|
static void monitor_qapi_event_init(void)
|
|
{
|
|
monitor_qapi_event_state = g_hash_table_new(qapi_event_throttle_hash,
|
|
qapi_event_throttle_equal);
|
|
}
|
|
|
|
void monitor_init_globals_core(void)
|
|
{
|
|
monitor_qapi_event_init();
|
|
qemu_mutex_init(&monitor_lock);
|
|
coroutine_mon = g_hash_table_new(NULL, NULL);
|
|
|
|
/*
|
|
* The dispatcher BH must run in the main loop thread, since we
|
|
* have commands assuming that context. It would be nice to get
|
|
* rid of those assumptions.
|
|
*/
|
|
qmp_dispatcher_co = qemu_coroutine_create(monitor_qmp_dispatcher_co, NULL);
|
|
qatomic_mb_set(&qmp_dispatcher_co_busy, true);
|
|
aio_co_schedule(iohandler_get_aio_context(), qmp_dispatcher_co);
|
|
}
|
|
|
|
int monitor_init(MonitorOptions *opts, bool allow_hmp, Error **errp)
|
|
{
|
|
Chardev *chr;
|
|
Error *local_err = NULL;
|
|
|
|
chr = qemu_chr_find(opts->chardev);
|
|
if (chr == NULL) {
|
|
error_setg(errp, "chardev \"%s\" not found", opts->chardev);
|
|
return -1;
|
|
}
|
|
|
|
if (!opts->has_mode) {
|
|
opts->mode = allow_hmp ? MONITOR_MODE_READLINE : MONITOR_MODE_CONTROL;
|
|
}
|
|
|
|
switch (opts->mode) {
|
|
case MONITOR_MODE_CONTROL:
|
|
monitor_init_qmp(chr, opts->pretty, &local_err);
|
|
break;
|
|
case MONITOR_MODE_READLINE:
|
|
if (!allow_hmp) {
|
|
error_setg(errp, "Only QMP is supported");
|
|
return -1;
|
|
}
|
|
if (opts->pretty) {
|
|
warn_report("'pretty' is deprecated for HMP monitors, it has no "
|
|
"effect and will be removed in future versions");
|
|
}
|
|
monitor_init_hmp(chr, true, &local_err);
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int monitor_init_opts(QemuOpts *opts, Error **errp)
|
|
{
|
|
Visitor *v;
|
|
MonitorOptions *options;
|
|
int ret;
|
|
|
|
v = opts_visitor_new(opts);
|
|
visit_type_MonitorOptions(v, NULL, &options, errp);
|
|
visit_free(v);
|
|
if (!options) {
|
|
return -1;
|
|
}
|
|
|
|
ret = monitor_init(options, true, errp);
|
|
qapi_free_MonitorOptions(options);
|
|
return ret;
|
|
}
|
|
|
|
QemuOptsList qemu_mon_opts = {
|
|
.name = "mon",
|
|
.implied_opt_name = "chardev",
|
|
.head = QTAILQ_HEAD_INITIALIZER(qemu_mon_opts.head),
|
|
.desc = {
|
|
{
|
|
.name = "mode",
|
|
.type = QEMU_OPT_STRING,
|
|
},{
|
|
.name = "chardev",
|
|
.type = QEMU_OPT_STRING,
|
|
},{
|
|
.name = "pretty",
|
|
.type = QEMU_OPT_BOOL,
|
|
},
|
|
{ /* end of list */ }
|
|
},
|
|
};
|