Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 1 | /* |
Amit Shah | 73428a8 | 2011-07-20 13:35:30 +0530 | [diff] [blame] | 2 | * Generic Balloon handlers and management |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
Amit Shah | 73428a8 | 2011-07-20 13:35:30 +0530 | [diff] [blame] | 5 | * Copyright (C) 2011 Red Hat, Inc. |
| 6 | * Copyright (C) 2011 Amit Shah <amit.shah@redhat.com> |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 7 | * |
| 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 Bonzini | 83c9089 | 2012-12-17 18:19:49 +0100 | [diff] [blame] | 27 | #include "monitor/monitor.h" |
Paolo Bonzini | 022c62c | 2012-12-17 18:19:49 +0100 | [diff] [blame] | 28 | #include "exec/cpu-common.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 29 | #include "sysemu/kvm.h" |
| 30 | #include "sysemu/balloon.h" |
Prerna Saxena | 62dd89d | 2010-08-11 17:16:03 +0530 | [diff] [blame] | 31 | #include "trace.h" |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 32 | #include "qmp-commands.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 33 | #include "qapi/qmp/qjson.h" |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 34 | |
Amit Shah | 0a2a30d | 2011-07-20 13:08:46 +0530 | [diff] [blame] | 35 | static QEMUBalloonEvent *balloon_event_fn; |
Amit Shah | 30fb2ca | 2011-07-20 13:30:56 +0530 | [diff] [blame] | 36 | static QEMUBalloonStatus *balloon_stat_fn; |
Amit Shah | 0a2a30d | 2011-07-20 13:08:46 +0530 | [diff] [blame] | 37 | static void *balloon_opaque; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 38 | |
Amit Shah | 6c6ec18 | 2011-07-27 12:28:19 +0530 | [diff] [blame] | 39 | int qemu_add_balloon_handler(QEMUBalloonEvent *event_func, |
| 40 | QEMUBalloonStatus *stat_func, void *opaque) |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 41 | { |
Amit Shah | 6c6ec18 | 2011-07-27 12:28:19 +0530 | [diff] [blame] | 42 | if (balloon_event_fn || balloon_stat_fn || balloon_opaque) { |
| 43 | /* We're already registered one balloon handler. How many can |
| 44 | * a guest really have? |
| 45 | */ |
| 46 | error_report("Another balloon device already registered"); |
| 47 | return -1; |
| 48 | } |
Amit Shah | 30fb2ca | 2011-07-20 13:30:56 +0530 | [diff] [blame] | 49 | balloon_event_fn = event_func; |
| 50 | balloon_stat_fn = stat_func; |
Amit Shah | 0a2a30d | 2011-07-20 13:08:46 +0530 | [diff] [blame] | 51 | balloon_opaque = opaque; |
Amit Shah | 6c6ec18 | 2011-07-27 12:28:19 +0530 | [diff] [blame] | 52 | return 0; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 53 | } |
| 54 | |
Amit Shah | 8a7d552 | 2011-09-09 14:30:39 +0530 | [diff] [blame] | 55 | void qemu_remove_balloon_handler(void *opaque) |
| 56 | { |
| 57 | if (balloon_opaque != opaque) { |
| 58 | return; |
| 59 | } |
| 60 | balloon_event_fn = NULL; |
| 61 | balloon_stat_fn = NULL; |
| 62 | balloon_opaque = NULL; |
| 63 | } |
| 64 | |
Amit Shah | 30fb2ca | 2011-07-20 13:30:56 +0530 | [diff] [blame] | 65 | static int qemu_balloon(ram_addr_t target) |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 66 | { |
Amit Shah | 182b920 | 2011-07-20 13:14:12 +0530 | [diff] [blame] | 67 | if (!balloon_event_fn) { |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 68 | return 0; |
| 69 | } |
Amit Shah | 182b920 | 2011-07-20 13:14:12 +0530 | [diff] [blame] | 70 | trace_balloon_event(balloon_opaque, target); |
Amit Shah | 30fb2ca | 2011-07-20 13:30:56 +0530 | [diff] [blame] | 71 | balloon_event_fn(balloon_opaque, target); |
Amit Shah | 182b920 | 2011-07-20 13:14:12 +0530 | [diff] [blame] | 72 | return 1; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 73 | } |
| 74 | |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 75 | static int qemu_balloon_status(BalloonInfo *info) |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 76 | { |
Amit Shah | 30fb2ca | 2011-07-20 13:30:56 +0530 | [diff] [blame] | 77 | if (!balloon_stat_fn) { |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 78 | return 0; |
| 79 | } |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 80 | balloon_stat_fn(balloon_opaque, info); |
Amit Shah | 182b920 | 2011-07-20 13:14:12 +0530 | [diff] [blame] | 81 | return 1; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 82 | } |
| 83 | |
Daniel P. Berrange | 973603a | 2012-06-14 18:12:56 +0100 | [diff] [blame] | 84 | void qemu_balloon_changed(int64_t actual) |
| 85 | { |
| 86 | QObject *data; |
| 87 | |
| 88 | data = qobject_from_jsonf("{ 'actual': %" PRId64 " }", |
| 89 | actual); |
| 90 | |
| 91 | monitor_protocol_event(QEVENT_BALLOON_CHANGE, data); |
| 92 | |
| 93 | qobject_decref(data); |
| 94 | } |
| 95 | |
| 96 | |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 97 | BalloonInfo *qmp_query_balloon(Error **errp) |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 98 | { |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 99 | BalloonInfo *info; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 100 | |
| 101 | if (kvm_enabled() && !kvm_has_sync_mmu()) { |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 102 | error_set(errp, QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); |
| 103 | return NULL; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 104 | } |
| 105 | |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 106 | info = g_malloc0(sizeof(*info)); |
| 107 | |
| 108 | if (qemu_balloon_status(info) == 0) { |
| 109 | error_set(errp, QERR_DEVICE_NOT_ACTIVE, "balloon"); |
| 110 | qapi_free_BalloonInfo(info); |
| 111 | return NULL; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 112 | } |
| 113 | |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 114 | return info; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 115 | } |
| 116 | |
Luiz Capitulino | d72f326 | 2011-11-25 14:38:09 -0200 | [diff] [blame] | 117 | void qmp_balloon(int64_t value, Error **errp) |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 118 | { |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 119 | if (kvm_enabled() && !kvm_has_sync_mmu()) { |
Luiz Capitulino | d72f326 | 2011-11-25 14:38:09 -0200 | [diff] [blame] | 120 | error_set(errp, QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); |
| 121 | return; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 122 | } |
| 123 | |
Luiz Capitulino | d72f326 | 2011-11-25 14:38:09 -0200 | [diff] [blame] | 124 | if (value <= 0) { |
Luiz Capitulino | b3c83a2 | 2012-04-26 17:15:02 -0300 | [diff] [blame] | 125 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "target", "a size"); |
Luiz Capitulino | d72f326 | 2011-11-25 14:38:09 -0200 | [diff] [blame] | 126 | return; |
Amit Shah | 514e73e | 2011-07-27 16:50:54 +0530 | [diff] [blame] | 127 | } |
Luiz Capitulino | d72f326 | 2011-11-25 14:38:09 -0200 | [diff] [blame] | 128 | |
| 129 | if (qemu_balloon(value) == 0) { |
| 130 | error_set(errp, QERR_DEVICE_NOT_ACTIVE, "balloon"); |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 131 | } |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 132 | } |