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![Daniel P. Berrange](/assets/img/avatar_default.png)
After setting a balloon target value, applications have to continually poll 'query-balloon' to determine whether the guest has reacted to this request. The virtio-balloon backend knows exactly when the guest has reacted though, and thus it is possible to emit a JSON event to tell the mgmt application whenever the guest balloon changes. This introduces a new 'qemu_balloon_changed()' API which is to be called by balloon driver backends, whenever they have a change in balloon value. This takes the 'actual' balloon value, as would be found in the BalloonInfo struct. The qemu_balloon_change API emits a JSON monitor event which looks like: {"timestamp": {"seconds": 1337162462, "microseconds": 814521}, "event": "BALLOON_CHANGE", "data": {"actual": 944766976}} * balloon.c, balloon.h: Introduce qemu_balloon_changed() for emitting balloon change events on the monitor * hw/virtio-balloon.c: Invoke qemu_balloon_changed() whenever the guest changes the balloon actual value * monitor.c, monitor.h: Define QEVENT_BALLOON_CHANGE Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Acked-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
#ifndef MONITOR_H
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#define MONITOR_H
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#include "qemu-common.h"
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#include "qemu-char.h"
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#include "qerror.h"
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#include "qdict.h"
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#include "block.h"
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#include "readline.h"
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extern Monitor *cur_mon;
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extern Monitor *default_mon;
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/* flags for monitor_init */
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#define MONITOR_IS_DEFAULT 0x01
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#define MONITOR_USE_READLINE 0x02
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#define MONITOR_USE_CONTROL 0x04
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#define MONITOR_USE_PRETTY 0x08
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/* flags for monitor commands */
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#define MONITOR_CMD_ASYNC 0x0001
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/* QMP events */
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typedef enum MonitorEvent {
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QEVENT_SHUTDOWN,
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QEVENT_RESET,
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QEVENT_POWERDOWN,
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QEVENT_STOP,
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QEVENT_RESUME,
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QEVENT_VNC_CONNECTED,
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QEVENT_VNC_INITIALIZED,
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QEVENT_VNC_DISCONNECTED,
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QEVENT_BLOCK_IO_ERROR,
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QEVENT_RTC_CHANGE,
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QEVENT_WATCHDOG,
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QEVENT_SPICE_CONNECTED,
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QEVENT_SPICE_INITIALIZED,
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QEVENT_SPICE_DISCONNECTED,
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QEVENT_BLOCK_JOB_COMPLETED,
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QEVENT_BLOCK_JOB_CANCELLED,
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QEVENT_DEVICE_TRAY_MOVED,
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QEVENT_SUSPEND,
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QEVENT_WAKEUP,
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QEVENT_BALLOON_CHANGE,
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/* Add to 'monitor_event_names' array in monitor.c when
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* defining new events here */
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QEVENT_MAX,
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} MonitorEvent;
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int monitor_cur_is_qmp(void);
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void monitor_protocol_event(MonitorEvent event, QObject *data);
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void monitor_init(CharDriverState *chr, int flags);
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int monitor_suspend(Monitor *mon);
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void monitor_resume(Monitor *mon);
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int monitor_read_bdrv_key_start(Monitor *mon, BlockDriverState *bs,
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BlockDriverCompletionFunc *completion_cb,
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void *opaque);
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int monitor_read_block_device_key(Monitor *mon, const char *device,
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BlockDriverCompletionFunc *completion_cb,
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void *opaque);
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int monitor_get_fd(Monitor *mon, const char *fdname);
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void monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
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GCC_FMT_ATTR(2, 0);
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void monitor_printf(Monitor *mon, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
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void monitor_print_filename(Monitor *mon, const char *filename);
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void monitor_flush(Monitor *mon);
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int monitor_set_cpu(int cpu_index);
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int monitor_get_cpu_index(void);
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typedef void (MonitorCompletion)(void *opaque, QObject *ret_data);
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void monitor_set_error(Monitor *mon, QError *qerror);
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void monitor_read_command(Monitor *mon, int show_prompt);
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ReadLineState *monitor_get_rs(Monitor *mon);
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int monitor_read_password(Monitor *mon, ReadLineFunc *readline_func,
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void *opaque);
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int qmp_qom_set(Monitor *mon, const QDict *qdict, QObject **ret);
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int qmp_qom_get(Monitor *mon, const QDict *qdict, QObject **ret);
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#endif /* !MONITOR_H */
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