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/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 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 "sysemu.h"
#include "monitor.h"
#include "qjson.h"
#include "qint.h"
#include "cpu-common.h"
#include "kvm.h"
#include "balloon.h"
#include "trace.h"
static QEMUBalloonEvent *qemu_balloon_event;
void *qemu_balloon_event_opaque;
void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
{
qemu_balloon_event = func;
qemu_balloon_event_opaque = opaque;
}
int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque)
{
if (qemu_balloon_event) {
trace_balloon_event(qemu_balloon_event_opaque, target);
qemu_balloon_event(qemu_balloon_event_opaque, target, cb, opaque);
return 1;
} else {
return 0;
}
}
int qemu_balloon_status(MonitorCompletion cb, void *opaque)
{
if (qemu_balloon_event) {
qemu_balloon_event(qemu_balloon_event_opaque, 0, cb, opaque);
return 1;
} else {
return 0;
}
}
static void print_balloon_stat(const char *key, QObject *obj, void *opaque)
{
Monitor *mon = opaque;
if (strcmp(key, "actual"))
monitor_printf(mon, ",%s=%" PRId64, key,
qint_get_int(qobject_to_qint(obj)));
}
void monitor_print_balloon(Monitor *mon, const QObject *data)
{
QDict *qdict;
qdict = qobject_to_qdict(data);
if (!qdict_haskey(qdict, "actual"))
return;
monitor_printf(mon, "balloon: actual=%" PRId64,
qdict_get_int(qdict, "actual") >> 20);
qdict_iter(qdict, print_balloon_stat, mon);
monitor_printf(mon, "\n");
}
/**
* do_info_balloon(): Balloon information
*
* Make an asynchronous request for balloon info. When the request completes
* a QDict will be returned according to the following specification:
*
* - "actual": current balloon value in bytes
* The following fields may or may not be present:
* - "mem_swapped_in": Amount of memory swapped in (bytes)
* - "mem_swapped_out": Amount of memory swapped out (bytes)
* - "major_page_faults": Number of major faults
* - "minor_page_faults": Number of minor faults
* - "free_mem": Total amount of free and unused memory (bytes)
* - "total_mem": Total amount of available memory (bytes)
*
* Example:
*
* { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0,
* "major_page_faults": 142, "minor_page_faults": 239245,
* "free_mem": 1014185984, "total_mem": 1044668416 }
*/
int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque)
{
int ret;
if (kvm_enabled() && !kvm_has_sync_mmu()) {
qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
return -1;
}
ret = qemu_balloon_status(cb, opaque);
if (!ret) {
qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
return -1;
}
return 0;
}
/**
* do_balloon(): Request VM to change its memory allocation
*/
int do_balloon(Monitor *mon, const QDict *params,
MonitorCompletion cb, void *opaque)
{
int ret;
if (kvm_enabled() && !kvm_has_sync_mmu()) {
qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
return -1;
}
ret = qemu_balloon(qdict_get_int(params, "value"), cb, opaque);
if (ret == 0) {
qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
return -1;
}
cb(opaque, NULL);
return 0;
}
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