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 | |
Peter Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 27 | #include "qemu/osdep.h" |
Markus Armbruster | a0b1a66 | 2015-03-17 18:16:21 +0100 | [diff] [blame] | 28 | #include "qemu-common.h" |
Alex Williamson | 01ccbec | 2018-08-17 09:27:15 -0600 | [diff] [blame] | 29 | #include "qemu/atomic.h" |
Paolo Bonzini | 022c62c | 2012-12-17 18:19:49 +0100 | [diff] [blame] | 30 | #include "exec/cpu-common.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 31 | #include "sysemu/kvm.h" |
| 32 | #include "sysemu/balloon.h" |
Daniel P. Berrange | 0ab8ed1 | 2017-01-25 16:14:15 +0000 | [diff] [blame] | 33 | #include "trace-root.h" |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 34 | #include "qapi/error.h" |
Markus Armbruster | 112ed24 | 2018-02-26 17:13:27 -0600 | [diff] [blame] | 35 | #include "qapi/qapi-commands-misc.h" |
Markus Armbruster | cc7a8ea | 2015-03-17 17:22:46 +0100 | [diff] [blame] | 36 | #include "qapi/qmp/qerror.h" |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 37 | |
Amit Shah | 0a2a30d | 2011-07-20 13:08:46 +0530 | [diff] [blame] | 38 | static QEMUBalloonEvent *balloon_event_fn; |
Amit Shah | 30fb2ca | 2011-07-20 13:30:56 +0530 | [diff] [blame] | 39 | static QEMUBalloonStatus *balloon_stat_fn; |
Amit Shah | 0a2a30d | 2011-07-20 13:08:46 +0530 | [diff] [blame] | 40 | static void *balloon_opaque; |
Alex Williamson | 01ccbec | 2018-08-17 09:27:15 -0600 | [diff] [blame] | 41 | static int balloon_inhibit_count; |
Dr. David Alan Gilbert | 371ff5a | 2015-11-05 18:11:23 +0000 | [diff] [blame] | 42 | |
| 43 | bool qemu_balloon_is_inhibited(void) |
| 44 | { |
Alex Williamson | 01ccbec | 2018-08-17 09:27:15 -0600 | [diff] [blame] | 45 | return atomic_read(&balloon_inhibit_count) > 0; |
Dr. David Alan Gilbert | 371ff5a | 2015-11-05 18:11:23 +0000 | [diff] [blame] | 46 | } |
| 47 | |
| 48 | void qemu_balloon_inhibit(bool state) |
| 49 | { |
Alex Williamson | 01ccbec | 2018-08-17 09:27:15 -0600 | [diff] [blame] | 50 | if (state) { |
| 51 | atomic_inc(&balloon_inhibit_count); |
| 52 | } else { |
| 53 | atomic_dec(&balloon_inhibit_count); |
| 54 | } |
| 55 | |
| 56 | assert(atomic_read(&balloon_inhibit_count) >= 0); |
Dr. David Alan Gilbert | 371ff5a | 2015-11-05 18:11:23 +0000 | [diff] [blame] | 57 | } |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 58 | |
Eric Blake | 438e828 | 2015-02-10 15:40:30 -0700 | [diff] [blame] | 59 | static bool have_balloon(Error **errp) |
Markus Armbruster | 422e050 | 2015-01-13 17:44:14 +0100 | [diff] [blame] | 60 | { |
| 61 | if (kvm_enabled() && !kvm_has_sync_mmu()) { |
Markus Armbruster | 2ad28a0 | 2015-01-13 17:50:23 +0100 | [diff] [blame] | 62 | error_set(errp, ERROR_CLASS_KVM_MISSING_CAP, |
| 63 | "Using KVM without synchronous MMU, balloon unavailable"); |
Markus Armbruster | 422e050 | 2015-01-13 17:44:14 +0100 | [diff] [blame] | 64 | return false; |
| 65 | } |
| 66 | if (!balloon_event_fn) { |
Markus Armbruster | 2ad28a0 | 2015-01-13 17:50:23 +0100 | [diff] [blame] | 67 | error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE, |
| 68 | "No balloon device has been activated"); |
Markus Armbruster | 422e050 | 2015-01-13 17:44:14 +0100 | [diff] [blame] | 69 | return false; |
| 70 | } |
| 71 | return true; |
| 72 | } |
| 73 | |
Amit Shah | 6c6ec18 | 2011-07-27 12:28:19 +0530 | [diff] [blame] | 74 | int qemu_add_balloon_handler(QEMUBalloonEvent *event_func, |
| 75 | QEMUBalloonStatus *stat_func, void *opaque) |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 76 | { |
Amit Shah | 6c6ec18 | 2011-07-27 12:28:19 +0530 | [diff] [blame] | 77 | if (balloon_event_fn || balloon_stat_fn || balloon_opaque) { |
| 78 | /* We're already registered one balloon handler. How many can |
| 79 | * a guest really have? |
| 80 | */ |
Amit Shah | 6c6ec18 | 2011-07-27 12:28:19 +0530 | [diff] [blame] | 81 | return -1; |
| 82 | } |
Amit Shah | 30fb2ca | 2011-07-20 13:30:56 +0530 | [diff] [blame] | 83 | balloon_event_fn = event_func; |
| 84 | balloon_stat_fn = stat_func; |
Amit Shah | 0a2a30d | 2011-07-20 13:08:46 +0530 | [diff] [blame] | 85 | balloon_opaque = opaque; |
Amit Shah | 6c6ec18 | 2011-07-27 12:28:19 +0530 | [diff] [blame] | 86 | return 0; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 87 | } |
| 88 | |
Amit Shah | 8a7d552 | 2011-09-09 14:30:39 +0530 | [diff] [blame] | 89 | void qemu_remove_balloon_handler(void *opaque) |
| 90 | { |
| 91 | if (balloon_opaque != opaque) { |
| 92 | return; |
| 93 | } |
| 94 | balloon_event_fn = NULL; |
| 95 | balloon_stat_fn = NULL; |
| 96 | balloon_opaque = NULL; |
| 97 | } |
| 98 | |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 99 | BalloonInfo *qmp_query_balloon(Error **errp) |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 100 | { |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 101 | BalloonInfo *info; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 102 | |
Eric Blake | 438e828 | 2015-02-10 15:40:30 -0700 | [diff] [blame] | 103 | if (!have_balloon(errp)) { |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 104 | return NULL; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 105 | } |
| 106 | |
Markus Armbruster | 6502a14 | 2015-01-13 17:43:25 +0100 | [diff] [blame] | 107 | info = g_malloc0(sizeof(*info)); |
| 108 | balloon_stat_fn(balloon_opaque, info); |
Luiz Capitulino | 96637bc | 2011-10-21 11:41:37 -0200 | [diff] [blame] | 109 | return info; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 110 | } |
| 111 | |
Markus Armbruster | 6502a14 | 2015-01-13 17:43:25 +0100 | [diff] [blame] | 112 | void qmp_balloon(int64_t target, Error **errp) |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 113 | { |
Eric Blake | 438e828 | 2015-02-10 15:40:30 -0700 | [diff] [blame] | 114 | if (!have_balloon(errp)) { |
Luiz Capitulino | d72f326 | 2011-11-25 14:38:09 -0200 | [diff] [blame] | 115 | return; |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 116 | } |
| 117 | |
Markus Armbruster | 6502a14 | 2015-01-13 17:43:25 +0100 | [diff] [blame] | 118 | if (target <= 0) { |
Markus Armbruster | c6bd8c7 | 2015-03-17 11:54:50 +0100 | [diff] [blame] | 119 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "target", "a size"); |
Luiz Capitulino | d72f326 | 2011-11-25 14:38:09 -0200 | [diff] [blame] | 120 | return; |
Amit Shah | 514e73e | 2011-07-27 16:50:54 +0530 | [diff] [blame] | 121 | } |
Markus Armbruster | 6502a14 | 2015-01-13 17:43:25 +0100 | [diff] [blame] | 122 | |
| 123 | trace_balloon_event(balloon_opaque, target); |
| 124 | balloon_event_fn(balloon_opaque, target); |
Paolo Bonzini | 28c2897 | 2010-04-01 19:57:12 +0200 | [diff] [blame] | 125 | } |