root / balloon.c @ be637f74
History | View | Annotate | Download (5.1 kB)
1 |
/*
|
---|---|
2 |
* Generic Balloon handlers and management
|
3 |
*
|
4 |
* Copyright (c) 2003-2008 Fabrice Bellard
|
5 |
* Copyright (C) 2011 Red Hat, Inc.
|
6 |
* Copyright (C) 2011 Amit Shah <amit.shah@redhat.com>
|
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 |
|
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" |
33 |
#include "trace.h" |
34 |
|
35 |
static QEMUBalloonEvent *balloon_event_fn;
|
36 |
static QEMUBalloonStatus *balloon_stat_fn;
|
37 |
static void *balloon_opaque; |
38 |
|
39 |
int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
|
40 |
QEMUBalloonStatus *stat_func, void *opaque)
|
41 |
{ |
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 |
} |
49 |
balloon_event_fn = event_func; |
50 |
balloon_stat_fn = stat_func; |
51 |
balloon_opaque = opaque; |
52 |
return 0; |
53 |
} |
54 |
|
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 |
|
65 |
static int qemu_balloon(ram_addr_t target) |
66 |
{ |
67 |
if (!balloon_event_fn) {
|
68 |
return 0; |
69 |
} |
70 |
trace_balloon_event(balloon_opaque, target); |
71 |
balloon_event_fn(balloon_opaque, target); |
72 |
return 1; |
73 |
} |
74 |
|
75 |
static int qemu_balloon_status(MonitorCompletion cb, void *opaque) |
76 |
{ |
77 |
if (!balloon_stat_fn) {
|
78 |
return 0; |
79 |
} |
80 |
balloon_stat_fn(balloon_opaque, cb, opaque); |
81 |
return 1; |
82 |
} |
83 |
|
84 |
static void print_balloon_stat(const char *key, QObject *obj, void *opaque) |
85 |
{ |
86 |
Monitor *mon = opaque; |
87 |
|
88 |
if (strcmp(key, "actual")) { |
89 |
monitor_printf(mon, ",%s=%" PRId64, key,
|
90 |
qint_get_int(qobject_to_qint(obj))); |
91 |
} |
92 |
} |
93 |
|
94 |
void monitor_print_balloon(Monitor *mon, const QObject *data) |
95 |
{ |
96 |
QDict *qdict; |
97 |
|
98 |
qdict = qobject_to_qdict(data); |
99 |
if (!qdict_haskey(qdict, "actual")) { |
100 |
return;
|
101 |
} |
102 |
monitor_printf(mon, "balloon: actual=%" PRId64,
|
103 |
qdict_get_int(qdict, "actual") >> 20); |
104 |
qdict_iter(qdict, print_balloon_stat, mon); |
105 |
monitor_printf(mon, "\n");
|
106 |
} |
107 |
|
108 |
/**
|
109 |
* do_info_balloon(): Balloon information
|
110 |
*
|
111 |
* Make an asynchronous request for balloon info. When the request completes
|
112 |
* a QDict will be returned according to the following specification:
|
113 |
*
|
114 |
* - "actual": current balloon value in bytes
|
115 |
* The following fields may or may not be present:
|
116 |
* - "mem_swapped_in": Amount of memory swapped in (bytes)
|
117 |
* - "mem_swapped_out": Amount of memory swapped out (bytes)
|
118 |
* - "major_page_faults": Number of major faults
|
119 |
* - "minor_page_faults": Number of minor faults
|
120 |
* - "free_mem": Total amount of free and unused memory (bytes)
|
121 |
* - "total_mem": Total amount of available memory (bytes)
|
122 |
*
|
123 |
* Example:
|
124 |
*
|
125 |
* { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0,
|
126 |
* "major_page_faults": 142, "minor_page_faults": 239245,
|
127 |
* "free_mem": 1014185984, "total_mem": 1044668416 }
|
128 |
*/
|
129 |
int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque) |
130 |
{ |
131 |
int ret;
|
132 |
|
133 |
if (kvm_enabled() && !kvm_has_sync_mmu()) {
|
134 |
qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); |
135 |
return -1; |
136 |
} |
137 |
|
138 |
ret = qemu_balloon_status(cb, opaque); |
139 |
if (!ret) {
|
140 |
qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
|
141 |
return -1; |
142 |
} |
143 |
|
144 |
return 0; |
145 |
} |
146 |
|
147 |
/**
|
148 |
* do_balloon(): Request VM to change its memory allocation
|
149 |
*/
|
150 |
int do_balloon(Monitor *mon, const QDict *params, |
151 |
MonitorCompletion cb, void *opaque)
|
152 |
{ |
153 |
int64_t target; |
154 |
int ret;
|
155 |
|
156 |
if (kvm_enabled() && !kvm_has_sync_mmu()) {
|
157 |
qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon"); |
158 |
return -1; |
159 |
} |
160 |
|
161 |
target = qdict_get_int(params, "value");
|
162 |
if (target <= 0) { |
163 |
qerror_report(QERR_INVALID_PARAMETER_VALUE, "target", "a size"); |
164 |
return -1; |
165 |
} |
166 |
ret = qemu_balloon(target); |
167 |
if (ret == 0) { |
168 |
qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
|
169 |
return -1; |
170 |
} |
171 |
|
172 |
cb(opaque, NULL);
|
173 |
return 0; |
174 |
} |