clang's C11 atomic_fetch_*() functions only take a C11 atomic type pointer argument. QEMU uses direct types (int, etc) and this causes a compiler error when a QEMU code calls these functions in a source file that also included <stdatomic.h> via a system header file: $ CC=clang CXX=clang++ ./configure ... && make ../util/async.c:79:17: error: address argument to atomic operation must be a pointer to _Atomic type ('unsigned int *' invalid) Avoid using atomic_*() names in QEMU's atomic.h since that namespace is used by <stdatomic.h>. Prefix QEMU's APIs with 'q' so that atomic.h and <stdatomic.h> can co-exist. I checked /usr/include on my machine and searched GitHub for existing "qatomic_" users but there seem to be none. This patch was generated using: $ git grep -h -o '\<atomic\(64\)\?_[a-z0-9_]\+' include/qemu/atomic.h | \ sort -u >/tmp/changed_identifiers $ for identifier in $(</tmp/changed_identifiers); do sed -i "s%\<$identifier\>%q$identifier%g" \ $(git grep -I -l "\<$identifier\>") done I manually fixed line-wrap issues and misaligned rST tables. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200923105646.47864-1-stefanha@redhat.com>
692 lines
19 KiB
C
692 lines
19 KiB
C
/*
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* QEMU monitor
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "monitor-internal.h"
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#include "qapi/error.h"
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#include "qapi/opts-visitor.h"
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#include "qapi/qapi-emit-events.h"
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#include "qapi/qapi-visit-control.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qstring.h"
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#include "qemu/error-report.h"
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#include "qemu/option.h"
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#include "sysemu/qtest.h"
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#include "sysemu/sysemu.h"
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#include "trace.h"
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/*
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* To prevent flooding clients, events can be throttled. The
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* throttling is calculated globally, rather than per-Monitor
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* instance.
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*/
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typedef struct MonitorQAPIEventState {
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QAPIEvent event; /* Throttling state for this event type and... */
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QDict *data; /* ... data, see qapi_event_throttle_equal() */
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QEMUTimer *timer; /* Timer for handling delayed events */
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QDict *qdict; /* Delayed event (if any) */
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} MonitorQAPIEventState;
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typedef struct {
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int64_t rate; /* Minimum time (in ns) between two events */
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} MonitorQAPIEventConf;
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/* Shared monitor I/O thread */
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IOThread *mon_iothread;
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/* Bottom half to dispatch the requests received from I/O thread */
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QEMUBH *qmp_dispatcher_bh;
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/* Protects mon_list, monitor_qapi_event_state, monitor_destroyed. */
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QemuMutex monitor_lock;
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static GHashTable *monitor_qapi_event_state;
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MonitorList mon_list;
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int mon_refcount;
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static bool monitor_destroyed;
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__thread Monitor *cur_mon;
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/**
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* Is the current monitor, if any, a QMP monitor?
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*/
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bool monitor_cur_is_qmp(void)
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{
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return cur_mon && monitor_is_qmp(cur_mon);
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}
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/**
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* Is @mon is using readline?
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* Note: not all HMP monitors use readline, e.g., gdbserver has a
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* non-interactive HMP monitor, so readline is not used there.
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*/
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static inline bool monitor_uses_readline(const MonitorHMP *mon)
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{
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return mon->use_readline;
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}
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static inline bool monitor_is_hmp_non_interactive(const Monitor *mon)
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{
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if (monitor_is_qmp(mon)) {
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return false;
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}
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return !monitor_uses_readline(container_of(mon, MonitorHMP, common));
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}
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static void monitor_flush_locked(Monitor *mon);
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static gboolean monitor_unblocked(GIOChannel *chan, GIOCondition cond,
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void *opaque)
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{
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Monitor *mon = opaque;
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qemu_mutex_lock(&mon->mon_lock);
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mon->out_watch = 0;
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monitor_flush_locked(mon);
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qemu_mutex_unlock(&mon->mon_lock);
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return FALSE;
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}
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/* Caller must hold mon->mon_lock */
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static void monitor_flush_locked(Monitor *mon)
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{
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int rc;
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size_t len;
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const char *buf;
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if (mon->skip_flush) {
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return;
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}
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buf = qstring_get_str(mon->outbuf);
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len = qstring_get_length(mon->outbuf);
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if (len && !mon->mux_out) {
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rc = qemu_chr_fe_write(&mon->chr, (const uint8_t *) buf, len);
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if ((rc < 0 && errno != EAGAIN) || (rc == len)) {
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/* all flushed or error */
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qobject_unref(mon->outbuf);
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mon->outbuf = qstring_new();
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return;
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}
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if (rc > 0) {
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/* partial write */
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QString *tmp = qstring_from_str(buf + rc);
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qobject_unref(mon->outbuf);
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mon->outbuf = tmp;
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}
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if (mon->out_watch == 0) {
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mon->out_watch =
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qemu_chr_fe_add_watch(&mon->chr, G_IO_OUT | G_IO_HUP,
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monitor_unblocked, mon);
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}
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}
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}
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void monitor_flush(Monitor *mon)
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{
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qemu_mutex_lock(&mon->mon_lock);
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monitor_flush_locked(mon);
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qemu_mutex_unlock(&mon->mon_lock);
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}
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/* flush at every end of line */
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int monitor_puts(Monitor *mon, const char *str)
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{
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int i;
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char c;
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qemu_mutex_lock(&mon->mon_lock);
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for (i = 0; str[i]; i++) {
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c = str[i];
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if (c == '\n') {
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qstring_append_chr(mon->outbuf, '\r');
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}
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qstring_append_chr(mon->outbuf, c);
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if (c == '\n') {
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monitor_flush_locked(mon);
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}
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}
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qemu_mutex_unlock(&mon->mon_lock);
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return i;
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}
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int monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
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{
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char *buf;
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int n;
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if (!mon) {
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return -1;
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}
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if (monitor_is_qmp(mon)) {
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return -1;
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}
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buf = g_strdup_vprintf(fmt, ap);
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n = monitor_puts(mon, buf);
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g_free(buf);
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return n;
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}
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int monitor_printf(Monitor *mon, const char *fmt, ...)
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{
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int ret;
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va_list ap;
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va_start(ap, fmt);
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ret = monitor_vprintf(mon, fmt, ap);
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va_end(ap);
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return ret;
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}
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/*
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* Print to current monitor if we have one, else to stderr.
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*/
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int error_vprintf(const char *fmt, va_list ap)
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{
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if (cur_mon && !monitor_cur_is_qmp()) {
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return monitor_vprintf(cur_mon, fmt, ap);
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}
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return vfprintf(stderr, fmt, ap);
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}
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int error_vprintf_unless_qmp(const char *fmt, va_list ap)
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{
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if (!cur_mon) {
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return vfprintf(stderr, fmt, ap);
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}
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if (!monitor_cur_is_qmp()) {
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return monitor_vprintf(cur_mon, fmt, ap);
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}
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return -1;
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}
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static MonitorQAPIEventConf monitor_qapi_event_conf[QAPI_EVENT__MAX] = {
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/* Limit guest-triggerable events to 1 per second */
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[QAPI_EVENT_RTC_CHANGE] = { 1000 * SCALE_MS },
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[QAPI_EVENT_WATCHDOG] = { 1000 * SCALE_MS },
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[QAPI_EVENT_BALLOON_CHANGE] = { 1000 * SCALE_MS },
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[QAPI_EVENT_QUORUM_REPORT_BAD] = { 1000 * SCALE_MS },
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[QAPI_EVENT_QUORUM_FAILURE] = { 1000 * SCALE_MS },
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[QAPI_EVENT_VSERPORT_CHANGE] = { 1000 * SCALE_MS },
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[QAPI_EVENT_MEMORY_DEVICE_SIZE_CHANGE] = { 1000 * SCALE_MS },
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};
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/*
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* Return the clock to use for recording an event's time.
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* It's QEMU_CLOCK_REALTIME, except for qtests it's
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* QEMU_CLOCK_VIRTUAL, to support testing rate limits.
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* Beware: result is invalid before configure_accelerator().
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*/
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static inline QEMUClockType monitor_get_event_clock(void)
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{
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return qtest_enabled() ? QEMU_CLOCK_VIRTUAL : QEMU_CLOCK_REALTIME;
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}
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/*
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* Broadcast an event to all monitors.
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* @qdict is the event object. Its member "event" must match @event.
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* Caller must hold monitor_lock.
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*/
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static void monitor_qapi_event_emit(QAPIEvent event, QDict *qdict)
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{
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Monitor *mon;
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MonitorQMP *qmp_mon;
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trace_monitor_protocol_event_emit(event, qdict);
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QTAILQ_FOREACH(mon, &mon_list, entry) {
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if (!monitor_is_qmp(mon)) {
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continue;
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}
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qmp_mon = container_of(mon, MonitorQMP, common);
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if (qmp_mon->commands != &qmp_cap_negotiation_commands) {
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qmp_send_response(qmp_mon, qdict);
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}
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}
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}
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static void monitor_qapi_event_handler(void *opaque);
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/*
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* Queue a new event for emission to Monitor instances,
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* applying any rate limiting if required.
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*/
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static void
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monitor_qapi_event_queue_no_reenter(QAPIEvent event, QDict *qdict)
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{
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MonitorQAPIEventConf *evconf;
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MonitorQAPIEventState *evstate;
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assert(event < QAPI_EVENT__MAX);
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evconf = &monitor_qapi_event_conf[event];
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trace_monitor_protocol_event_queue(event, qdict, evconf->rate);
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qemu_mutex_lock(&monitor_lock);
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if (!evconf->rate) {
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/* Unthrottled event */
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monitor_qapi_event_emit(event, qdict);
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} else {
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QDict *data = qobject_to(QDict, qdict_get(qdict, "data"));
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MonitorQAPIEventState key = { .event = event, .data = data };
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evstate = g_hash_table_lookup(monitor_qapi_event_state, &key);
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assert(!evstate || timer_pending(evstate->timer));
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if (evstate) {
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/*
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* Timer is pending for (at least) evconf->rate ns after
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* last send. Store event for sending when timer fires,
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* replacing a prior stored event if any.
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*/
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qobject_unref(evstate->qdict);
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evstate->qdict = qobject_ref(qdict);
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} else {
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/*
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* Last send was (at least) evconf->rate ns ago.
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* Send immediately, and arm the timer to call
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* monitor_qapi_event_handler() in evconf->rate ns. Any
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* events arriving before then will be delayed until then.
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*/
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int64_t now = qemu_clock_get_ns(monitor_get_event_clock());
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monitor_qapi_event_emit(event, qdict);
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evstate = g_new(MonitorQAPIEventState, 1);
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evstate->event = event;
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evstate->data = qobject_ref(data);
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evstate->qdict = NULL;
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evstate->timer = timer_new_ns(monitor_get_event_clock(),
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monitor_qapi_event_handler,
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evstate);
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g_hash_table_add(monitor_qapi_event_state, evstate);
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timer_mod_ns(evstate->timer, now + evconf->rate);
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}
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}
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qemu_mutex_unlock(&monitor_lock);
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}
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void qapi_event_emit(QAPIEvent event, QDict *qdict)
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{
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/*
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* monitor_qapi_event_queue_no_reenter() is not reentrant: it
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* would deadlock on monitor_lock. Work around by queueing
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* events in thread-local storage.
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* TODO: remove this, make it re-enter safe.
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*/
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typedef struct MonitorQapiEvent {
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QAPIEvent event;
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QDict *qdict;
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QSIMPLEQ_ENTRY(MonitorQapiEvent) entry;
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} MonitorQapiEvent;
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static __thread QSIMPLEQ_HEAD(, MonitorQapiEvent) event_queue;
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static __thread bool reentered;
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MonitorQapiEvent *ev;
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if (!reentered) {
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QSIMPLEQ_INIT(&event_queue);
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}
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ev = g_new(MonitorQapiEvent, 1);
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ev->qdict = qobject_ref(qdict);
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ev->event = event;
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QSIMPLEQ_INSERT_TAIL(&event_queue, ev, entry);
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if (reentered) {
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return;
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}
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reentered = true;
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while ((ev = QSIMPLEQ_FIRST(&event_queue)) != NULL) {
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QSIMPLEQ_REMOVE_HEAD(&event_queue, entry);
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monitor_qapi_event_queue_no_reenter(ev->event, ev->qdict);
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qobject_unref(ev->qdict);
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g_free(ev);
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}
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reentered = false;
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}
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/*
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* This function runs evconf->rate ns after sending a throttled
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* event.
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* If another event has since been stored, send it.
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*/
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static void monitor_qapi_event_handler(void *opaque)
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{
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MonitorQAPIEventState *evstate = opaque;
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MonitorQAPIEventConf *evconf = &monitor_qapi_event_conf[evstate->event];
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trace_monitor_protocol_event_handler(evstate->event, evstate->qdict);
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qemu_mutex_lock(&monitor_lock);
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if (evstate->qdict) {
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int64_t now = qemu_clock_get_ns(monitor_get_event_clock());
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monitor_qapi_event_emit(evstate->event, evstate->qdict);
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qobject_unref(evstate->qdict);
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evstate->qdict = NULL;
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timer_mod_ns(evstate->timer, now + evconf->rate);
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} else {
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g_hash_table_remove(monitor_qapi_event_state, evstate);
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qobject_unref(evstate->data);
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timer_free(evstate->timer);
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g_free(evstate);
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}
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qemu_mutex_unlock(&monitor_lock);
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}
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static unsigned int qapi_event_throttle_hash(const void *key)
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{
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const MonitorQAPIEventState *evstate = key;
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unsigned int hash = evstate->event * 255;
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if (evstate->event == QAPI_EVENT_VSERPORT_CHANGE) {
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hash += g_str_hash(qdict_get_str(evstate->data, "id"));
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}
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if (evstate->event == QAPI_EVENT_QUORUM_REPORT_BAD) {
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hash += g_str_hash(qdict_get_str(evstate->data, "node-name"));
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}
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return hash;
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}
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static gboolean qapi_event_throttle_equal(const void *a, const void *b)
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{
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const MonitorQAPIEventState *eva = a;
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const MonitorQAPIEventState *evb = b;
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if (eva->event != evb->event) {
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return FALSE;
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}
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if (eva->event == QAPI_EVENT_VSERPORT_CHANGE) {
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return !strcmp(qdict_get_str(eva->data, "id"),
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qdict_get_str(evb->data, "id"));
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}
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if (eva->event == QAPI_EVENT_QUORUM_REPORT_BAD) {
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return !strcmp(qdict_get_str(eva->data, "node-name"),
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qdict_get_str(evb->data, "node-name"));
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}
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return TRUE;
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}
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int monitor_suspend(Monitor *mon)
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{
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if (monitor_is_hmp_non_interactive(mon)) {
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return -ENOTTY;
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}
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qatomic_inc(&mon->suspend_cnt);
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if (mon->use_io_thread) {
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/*
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* Kick I/O thread to make sure this takes effect. It'll be
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* evaluated again in prepare() of the watch object.
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*/
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aio_notify(iothread_get_aio_context(mon_iothread));
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}
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trace_monitor_suspend(mon, 1);
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return 0;
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}
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static void monitor_accept_input(void *opaque)
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{
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Monitor *mon = opaque;
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qemu_chr_fe_accept_input(&mon->chr);
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}
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void monitor_resume(Monitor *mon)
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{
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if (monitor_is_hmp_non_interactive(mon)) {
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return;
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}
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if (qatomic_dec_fetch(&mon->suspend_cnt) == 0) {
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AioContext *ctx;
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if (mon->use_io_thread) {
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ctx = iothread_get_aio_context(mon_iothread);
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} else {
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ctx = qemu_get_aio_context();
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}
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if (!monitor_is_qmp(mon)) {
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MonitorHMP *hmp_mon = container_of(mon, MonitorHMP, common);
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assert(hmp_mon->rs);
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readline_show_prompt(hmp_mon->rs);
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}
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aio_bh_schedule_oneshot(ctx, monitor_accept_input, mon);
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}
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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 = qstring_new();
|
|
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);
|
|
}
|
|
qobject_unref(mon->outbuf);
|
|
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);
|
|
}
|
|
|
|
/* 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);
|
|
|
|
/* QEMUBHs needs to be deleted before destroying the I/O thread */
|
|
qemu_bh_delete(qmp_dispatcher_bh);
|
|
qmp_dispatcher_bh = NULL;
|
|
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);
|
|
|
|
/*
|
|
* 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_bh = aio_bh_new(iohandler_get_aio_context(),
|
|
monitor_qmp_bh_dispatcher,
|
|
NULL);
|
|
}
|
|
|
|
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 */ }
|
|
},
|
|
};
|