blob: dea19a470aced08b9f8f64f181960701e4af08ed [file] [log] [blame]
Paolo Bonzini28c28972010-04-01 19:57:12 +02001/*
Amit Shah73428a82011-07-20 13:35:30 +05302 * Generic Balloon handlers and management
Paolo Bonzini28c28972010-04-01 19:57:12 +02003 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
Amit Shah73428a82011-07-20 13:35:30 +05305 * Copyright (C) 2011 Red Hat, Inc.
6 * Copyright (C) 2011 Amit Shah <amit.shah@redhat.com>
Paolo Bonzini28c28972010-04-01 19:57:12 +02007 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
Paolo Bonzini83c90892012-12-17 18:19:49 +010027#include "monitor/monitor.h"
Paolo Bonzini022c62c2012-12-17 18:19:49 +010028#include "exec/cpu-common.h"
Paolo Bonzini9c17d612012-12-17 18:20:04 +010029#include "sysemu/kvm.h"
30#include "sysemu/balloon.h"
Prerna Saxena62dd89d2010-08-11 17:16:03 +053031#include "trace.h"
Luiz Capitulino96637bc2011-10-21 11:41:37 -020032#include "qmp-commands.h"
Paolo Bonzini7b1b5d12012-12-17 18:19:43 +010033#include "qapi/qmp/qjson.h"
Paolo Bonzini28c28972010-04-01 19:57:12 +020034
Amit Shah0a2a30d2011-07-20 13:08:46 +053035static QEMUBalloonEvent *balloon_event_fn;
Amit Shah30fb2ca2011-07-20 13:30:56 +053036static QEMUBalloonStatus *balloon_stat_fn;
Amit Shah0a2a30d2011-07-20 13:08:46 +053037static void *balloon_opaque;
Paolo Bonzini28c28972010-04-01 19:57:12 +020038
Markus Armbruster422e0502015-01-13 17:44:14 +010039static bool have_ballon(Error **errp)
40{
41 if (kvm_enabled() && !kvm_has_sync_mmu()) {
Markus Armbruster2ad28a02015-01-13 17:50:23 +010042 error_set(errp, ERROR_CLASS_KVM_MISSING_CAP,
43 "Using KVM without synchronous MMU, balloon unavailable");
Markus Armbruster422e0502015-01-13 17:44:14 +010044 return false;
45 }
46 if (!balloon_event_fn) {
Markus Armbruster2ad28a02015-01-13 17:50:23 +010047 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
48 "No balloon device has been activated");
Markus Armbruster422e0502015-01-13 17:44:14 +010049 return false;
50 }
51 return true;
52}
53
Amit Shah6c6ec182011-07-27 12:28:19 +053054int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
55 QEMUBalloonStatus *stat_func, void *opaque)
Paolo Bonzini28c28972010-04-01 19:57:12 +020056{
Amit Shah6c6ec182011-07-27 12:28:19 +053057 if (balloon_event_fn || balloon_stat_fn || balloon_opaque) {
58 /* We're already registered one balloon handler. How many can
59 * a guest really have?
60 */
61 error_report("Another balloon device already registered");
62 return -1;
63 }
Amit Shah30fb2ca2011-07-20 13:30:56 +053064 balloon_event_fn = event_func;
65 balloon_stat_fn = stat_func;
Amit Shah0a2a30d2011-07-20 13:08:46 +053066 balloon_opaque = opaque;
Amit Shah6c6ec182011-07-27 12:28:19 +053067 return 0;
Paolo Bonzini28c28972010-04-01 19:57:12 +020068}
69
Amit Shah8a7d5522011-09-09 14:30:39 +053070void qemu_remove_balloon_handler(void *opaque)
71{
72 if (balloon_opaque != opaque) {
73 return;
74 }
75 balloon_event_fn = NULL;
76 balloon_stat_fn = NULL;
77 balloon_opaque = NULL;
78}
79
Luiz Capitulino96637bc2011-10-21 11:41:37 -020080BalloonInfo *qmp_query_balloon(Error **errp)
Paolo Bonzini28c28972010-04-01 19:57:12 +020081{
Luiz Capitulino96637bc2011-10-21 11:41:37 -020082 BalloonInfo *info;
Paolo Bonzini28c28972010-04-01 19:57:12 +020083
Markus Armbruster422e0502015-01-13 17:44:14 +010084 if (!have_ballon(errp)) {
Luiz Capitulino96637bc2011-10-21 11:41:37 -020085 return NULL;
Paolo Bonzini28c28972010-04-01 19:57:12 +020086 }
87
Markus Armbruster6502a142015-01-13 17:43:25 +010088 info = g_malloc0(sizeof(*info));
89 balloon_stat_fn(balloon_opaque, info);
Luiz Capitulino96637bc2011-10-21 11:41:37 -020090 return info;
Paolo Bonzini28c28972010-04-01 19:57:12 +020091}
92
Markus Armbruster6502a142015-01-13 17:43:25 +010093void qmp_balloon(int64_t target, Error **errp)
Paolo Bonzini28c28972010-04-01 19:57:12 +020094{
Markus Armbruster422e0502015-01-13 17:44:14 +010095 if (!have_ballon(errp)) {
Luiz Capitulinod72f3262011-11-25 14:38:09 -020096 return;
Paolo Bonzini28c28972010-04-01 19:57:12 +020097 }
98
Markus Armbruster6502a142015-01-13 17:43:25 +010099 if (target <= 0) {
Luiz Capitulinob3c83a22012-04-26 17:15:02 -0300100 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "target", "a size");
Luiz Capitulinod72f3262011-11-25 14:38:09 -0200101 return;
Amit Shah514e73e2011-07-27 16:50:54 +0530102 }
Markus Armbruster6502a142015-01-13 17:43:25 +0100103
104 trace_balloon_event(balloon_opaque, target);
105 balloon_event_fn(balloon_opaque, target);
Paolo Bonzini28c28972010-04-01 19:57:12 +0200106}