4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
28 #include "cpu-common.h"
34 static QEMUBalloonEvent *balloon_event_fn;
35 static void *balloon_opaque;
37 void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
39 balloon_event_fn = func;
40 balloon_opaque = opaque;
43 static int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque)
45 if (!balloon_event_fn) {
48 trace_balloon_event(balloon_opaque, target);
49 balloon_event_fn(balloon_opaque, target, cb, opaque);
53 static int qemu_balloon_status(MonitorCompletion cb, void *opaque)
55 if (!balloon_event_fn) {
58 balloon_event_fn(balloon_opaque, 0, cb, opaque);
62 static void print_balloon_stat(const char *key, QObject *obj, void *opaque)
64 Monitor *mon = opaque;
66 if (strcmp(key, "actual")) {
67 monitor_printf(mon, ",%s=%" PRId64, key,
68 qint_get_int(qobject_to_qint(obj)));
72 void monitor_print_balloon(Monitor *mon, const QObject *data)
76 qdict = qobject_to_qdict(data);
77 if (!qdict_haskey(qdict, "actual")) {
80 monitor_printf(mon, "balloon: actual=%" PRId64,
81 qdict_get_int(qdict, "actual") >> 20);
82 qdict_iter(qdict, print_balloon_stat, mon);
83 monitor_printf(mon, "\n");
87 * do_info_balloon(): Balloon information
89 * Make an asynchronous request for balloon info. When the request completes
90 * a QDict will be returned according to the following specification:
92 * - "actual": current balloon value in bytes
93 * The following fields may or may not be present:
94 * - "mem_swapped_in": Amount of memory swapped in (bytes)
95 * - "mem_swapped_out": Amount of memory swapped out (bytes)
96 * - "major_page_faults": Number of major faults
97 * - "minor_page_faults": Number of minor faults
98 * - "free_mem": Total amount of free and unused memory (bytes)
99 * - "total_mem": Total amount of available memory (bytes)
103 * { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0,
104 * "major_page_faults": 142, "minor_page_faults": 239245,
105 * "free_mem": 1014185984, "total_mem": 1044668416 }
107 int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque)
111 if (kvm_enabled() && !kvm_has_sync_mmu()) {
112 qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
116 ret = qemu_balloon_status(cb, opaque);
118 qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
126 * do_balloon(): Request VM to change its memory allocation
128 int do_balloon(Monitor *mon, const QDict *params,
129 MonitorCompletion cb, void *opaque)
133 if (kvm_enabled() && !kvm_has_sync_mmu()) {
134 qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
138 ret = qemu_balloon(qdict_get_int(params, "value"), cb, opaque);
140 qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");