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28c28973 PB |
1 | /* |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * | |
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: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
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 | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | ||
28c28973 PB |
25 | #include "monitor.h" |
26 | #include "qjson.h" | |
27 | #include "qint.h" | |
28 | #include "cpu-common.h" | |
29 | #include "kvm.h" | |
30 | #include "balloon.h" | |
62dd89de | 31 | #include "trace.h" |
28c28973 PB |
32 | |
33 | ||
0a2a30d5 | 34 | static QEMUBalloonEvent *balloon_event_fn; |
30fb2ca6 | 35 | static QEMUBalloonStatus *balloon_stat_fn; |
0a2a30d5 | 36 | static void *balloon_opaque; |
28c28973 | 37 | |
30fb2ca6 AS |
38 | void qemu_add_balloon_handler(QEMUBalloonEvent *event_func, |
39 | QEMUBalloonStatus *stat_func, void *opaque) | |
28c28973 | 40 | { |
30fb2ca6 AS |
41 | balloon_event_fn = event_func; |
42 | balloon_stat_fn = stat_func; | |
0a2a30d5 | 43 | balloon_opaque = opaque; |
28c28973 PB |
44 | } |
45 | ||
30fb2ca6 | 46 | static int qemu_balloon(ram_addr_t target) |
28c28973 | 47 | { |
182b9203 | 48 | if (!balloon_event_fn) { |
28c28973 PB |
49 | return 0; |
50 | } | |
182b9203 | 51 | trace_balloon_event(balloon_opaque, target); |
30fb2ca6 | 52 | balloon_event_fn(balloon_opaque, target); |
182b9203 | 53 | return 1; |
28c28973 PB |
54 | } |
55 | ||
0a2a30d5 | 56 | static int qemu_balloon_status(MonitorCompletion cb, void *opaque) |
28c28973 | 57 | { |
30fb2ca6 | 58 | if (!balloon_stat_fn) { |
28c28973 PB |
59 | return 0; |
60 | } | |
30fb2ca6 | 61 | balloon_stat_fn(balloon_opaque, cb, opaque); |
182b9203 | 62 | return 1; |
28c28973 PB |
63 | } |
64 | ||
65 | static void print_balloon_stat(const char *key, QObject *obj, void *opaque) | |
66 | { | |
67 | Monitor *mon = opaque; | |
68 | ||
b80bc1dd | 69 | if (strcmp(key, "actual")) { |
28c28973 PB |
70 | monitor_printf(mon, ",%s=%" PRId64, key, |
71 | qint_get_int(qobject_to_qint(obj))); | |
b80bc1dd | 72 | } |
28c28973 PB |
73 | } |
74 | ||
75 | void monitor_print_balloon(Monitor *mon, const QObject *data) | |
76 | { | |
77 | QDict *qdict; | |
78 | ||
79 | qdict = qobject_to_qdict(data); | |
b80bc1dd | 80 | if (!qdict_haskey(qdict, "actual")) { |
28c28973 | 81 | return; |
b80bc1dd | 82 | } |
28c28973 PB |
83 | monitor_printf(mon, "balloon: actual=%" PRId64, |
84 | qdict_get_int(qdict, "actual") >> 20); | |
85 | qdict_iter(qdict, print_balloon_stat, mon); | |
86 | monitor_printf(mon, "\n"); | |
87 | } | |
88 | ||
89 | /** | |
90 | * do_info_balloon(): Balloon information | |
91 | * | |
92 | * Make an asynchronous request for balloon info. When the request completes | |
93 | * a QDict will be returned according to the following specification: | |
94 | * | |
95 | * - "actual": current balloon value in bytes | |
96 | * The following fields may or may not be present: | |
97 | * - "mem_swapped_in": Amount of memory swapped in (bytes) | |
98 | * - "mem_swapped_out": Amount of memory swapped out (bytes) | |
99 | * - "major_page_faults": Number of major faults | |
100 | * - "minor_page_faults": Number of minor faults | |
101 | * - "free_mem": Total amount of free and unused memory (bytes) | |
102 | * - "total_mem": Total amount of available memory (bytes) | |
103 | * | |
104 | * Example: | |
105 | * | |
106 | * { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0, | |
107 | * "major_page_faults": 142, "minor_page_faults": 239245, | |
108 | * "free_mem": 1014185984, "total_mem": 1044668416 } | |
109 | */ | |
110 | int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque) | |
111 | { | |
112 | int ret; | |
113 | ||
114 | if (kvm_enabled() && !kvm_has_sync_mmu()) { | |
115 | qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); | |
116 | return -1; | |
117 | } | |
118 | ||
119 | ret = qemu_balloon_status(cb, opaque); | |
120 | if (!ret) { | |
121 | qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon"); | |
122 | return -1; | |
123 | } | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | /** | |
129 | * do_balloon(): Request VM to change its memory allocation | |
130 | */ | |
131 | int do_balloon(Monitor *mon, const QDict *params, | |
132 | MonitorCompletion cb, void *opaque) | |
133 | { | |
134 | int ret; | |
135 | ||
136 | if (kvm_enabled() && !kvm_has_sync_mmu()) { | |
137 | qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); | |
138 | return -1; | |
139 | } | |
140 | ||
30fb2ca6 | 141 | ret = qemu_balloon(qdict_get_int(params, "value")); |
28c28973 PB |
142 | if (ret == 0) { |
143 | qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon"); | |
144 | return -1; | |
145 | } | |
146 | ||
147 | cb(opaque, NULL); | |
148 | return 0; | |
149 | } |