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Commit | Line | Data |
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28c28973 | 1 | /* |
73428a8e | 2 | * Generic Balloon handlers and management |
28c28973 PB |
3 | * |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
73428a8e AS |
5 | * Copyright (C) 2011 Red Hat, Inc. |
6 | * Copyright (C) 2011 Amit Shah <amit.shah@redhat.com> | |
28c28973 PB |
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 | ||
28c28973 PB |
27 | #include "monitor.h" |
28 | #include "qjson.h" | |
29 | #include "qint.h" | |
30 | #include "cpu-common.h" | |
31 | #include "kvm.h" | |
32 | #include "balloon.h" | |
62dd89de | 33 | #include "trace.h" |
28c28973 | 34 | |
0a2a30d5 | 35 | static QEMUBalloonEvent *balloon_event_fn; |
30fb2ca6 | 36 | static QEMUBalloonStatus *balloon_stat_fn; |
0a2a30d5 | 37 | static void *balloon_opaque; |
28c28973 | 38 | |
30fb2ca6 AS |
39 | void qemu_add_balloon_handler(QEMUBalloonEvent *event_func, |
40 | QEMUBalloonStatus *stat_func, void *opaque) | |
28c28973 | 41 | { |
30fb2ca6 AS |
42 | balloon_event_fn = event_func; |
43 | balloon_stat_fn = stat_func; | |
0a2a30d5 | 44 | balloon_opaque = opaque; |
28c28973 PB |
45 | } |
46 | ||
30fb2ca6 | 47 | static int qemu_balloon(ram_addr_t target) |
28c28973 | 48 | { |
182b9203 | 49 | if (!balloon_event_fn) { |
28c28973 PB |
50 | return 0; |
51 | } | |
182b9203 | 52 | trace_balloon_event(balloon_opaque, target); |
30fb2ca6 | 53 | balloon_event_fn(balloon_opaque, target); |
182b9203 | 54 | return 1; |
28c28973 PB |
55 | } |
56 | ||
0a2a30d5 | 57 | static int qemu_balloon_status(MonitorCompletion cb, void *opaque) |
28c28973 | 58 | { |
30fb2ca6 | 59 | if (!balloon_stat_fn) { |
28c28973 PB |
60 | return 0; |
61 | } | |
30fb2ca6 | 62 | balloon_stat_fn(balloon_opaque, cb, opaque); |
182b9203 | 63 | return 1; |
28c28973 PB |
64 | } |
65 | ||
66 | static void print_balloon_stat(const char *key, QObject *obj, void *opaque) | |
67 | { | |
68 | Monitor *mon = opaque; | |
69 | ||
b80bc1dd | 70 | if (strcmp(key, "actual")) { |
28c28973 PB |
71 | monitor_printf(mon, ",%s=%" PRId64, key, |
72 | qint_get_int(qobject_to_qint(obj))); | |
b80bc1dd | 73 | } |
28c28973 PB |
74 | } |
75 | ||
76 | void monitor_print_balloon(Monitor *mon, const QObject *data) | |
77 | { | |
78 | QDict *qdict; | |
79 | ||
80 | qdict = qobject_to_qdict(data); | |
b80bc1dd | 81 | if (!qdict_haskey(qdict, "actual")) { |
28c28973 | 82 | return; |
b80bc1dd | 83 | } |
28c28973 PB |
84 | monitor_printf(mon, "balloon: actual=%" PRId64, |
85 | qdict_get_int(qdict, "actual") >> 20); | |
86 | qdict_iter(qdict, print_balloon_stat, mon); | |
87 | monitor_printf(mon, "\n"); | |
88 | } | |
89 | ||
90 | /** | |
91 | * do_info_balloon(): Balloon information | |
92 | * | |
93 | * Make an asynchronous request for balloon info. When the request completes | |
94 | * a QDict will be returned according to the following specification: | |
95 | * | |
96 | * - "actual": current balloon value in bytes | |
97 | * The following fields may or may not be present: | |
98 | * - "mem_swapped_in": Amount of memory swapped in (bytes) | |
99 | * - "mem_swapped_out": Amount of memory swapped out (bytes) | |
100 | * - "major_page_faults": Number of major faults | |
101 | * - "minor_page_faults": Number of minor faults | |
102 | * - "free_mem": Total amount of free and unused memory (bytes) | |
103 | * - "total_mem": Total amount of available memory (bytes) | |
104 | * | |
105 | * Example: | |
106 | * | |
107 | * { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0, | |
108 | * "major_page_faults": 142, "minor_page_faults": 239245, | |
109 | * "free_mem": 1014185984, "total_mem": 1044668416 } | |
110 | */ | |
111 | int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque) | |
112 | { | |
113 | int ret; | |
114 | ||
115 | if (kvm_enabled() && !kvm_has_sync_mmu()) { | |
116 | qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); | |
117 | return -1; | |
118 | } | |
119 | ||
120 | ret = qemu_balloon_status(cb, opaque); | |
121 | if (!ret) { | |
122 | qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon"); | |
123 | return -1; | |
124 | } | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | /** | |
130 | * do_balloon(): Request VM to change its memory allocation | |
131 | */ | |
132 | int do_balloon(Monitor *mon, const QDict *params, | |
133 | MonitorCompletion cb, void *opaque) | |
134 | { | |
135 | int ret; | |
136 | ||
137 | if (kvm_enabled() && !kvm_has_sync_mmu()) { | |
138 | qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); | |
139 | return -1; | |
140 | } | |
141 | ||
30fb2ca6 | 142 | ret = qemu_balloon(qdict_get_int(params, "value")); |
28c28973 PB |
143 | if (ret == 0) { |
144 | qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon"); | |
145 | return -1; | |
146 | } | |
147 | ||
148 | cb(opaque, NULL); | |
149 | return 0; | |
150 | } |