root / migration.c @ ac72472b
History | View | Annotate | Download (8.2 kB)
1 |
/*
|
---|---|
2 |
* QEMU live migration
|
3 |
*
|
4 |
* Copyright IBM, Corp. 2008
|
5 |
*
|
6 |
* Authors:
|
7 |
* Anthony Liguori <aliguori@us.ibm.com>
|
8 |
*
|
9 |
* This work is licensed under the terms of the GNU GPL, version 2. See
|
10 |
* the COPYING file in the top-level directory.
|
11 |
*
|
12 |
*/
|
13 |
|
14 |
#include "qemu-common.h" |
15 |
#include "migration.h" |
16 |
#include "monitor.h" |
17 |
#include "buffered_file.h" |
18 |
#include "sysemu.h" |
19 |
#include "block.h" |
20 |
#include "qemu_socket.h" |
21 |
|
22 |
//#define DEBUG_MIGRATION
|
23 |
|
24 |
#ifdef DEBUG_MIGRATION
|
25 |
#define dprintf(fmt, ...) \
|
26 |
do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) |
27 |
#else
|
28 |
#define dprintf(fmt, ...) \
|
29 |
do { } while (0) |
30 |
#endif
|
31 |
|
32 |
/* Migration speed throttling */
|
33 |
static uint32_t max_throttle = (32 << 20); |
34 |
|
35 |
static MigrationState *current_migration;
|
36 |
|
37 |
void qemu_start_incoming_migration(const char *uri) |
38 |
{ |
39 |
const char *p; |
40 |
|
41 |
if (strstart(uri, "tcp:", &p)) |
42 |
tcp_start_incoming_migration(p); |
43 |
#if !defined(WIN32)
|
44 |
else if (strstart(uri, "exec:", &p)) |
45 |
exec_start_incoming_migration(p); |
46 |
else if (strstart(uri, "unix:", &p)) |
47 |
unix_start_incoming_migration(p); |
48 |
else if (strstart(uri, "fd:", &p)) |
49 |
fd_start_incoming_migration(p); |
50 |
#endif
|
51 |
else
|
52 |
fprintf(stderr, "unknown migration protocol: %s\n", uri);
|
53 |
} |
54 |
|
55 |
void do_migrate(Monitor *mon, int detach, const char *uri) |
56 |
{ |
57 |
MigrationState *s = NULL;
|
58 |
const char *p; |
59 |
|
60 |
if (strstart(uri, "tcp:", &p)) |
61 |
s = tcp_start_outgoing_migration(p, max_throttle, detach); |
62 |
#if !defined(WIN32)
|
63 |
else if (strstart(uri, "exec:", &p)) |
64 |
s = exec_start_outgoing_migration(p, max_throttle, detach); |
65 |
else if (strstart(uri, "unix:", &p)) |
66 |
s = unix_start_outgoing_migration(p, max_throttle, detach); |
67 |
else if (strstart(uri, "fd:", &p)) |
68 |
s = fd_start_outgoing_migration(mon, p, max_throttle, detach); |
69 |
#endif
|
70 |
else
|
71 |
monitor_printf(mon, "unknown migration protocol: %s\n", uri);
|
72 |
|
73 |
if (s == NULL) |
74 |
monitor_printf(mon, "migration failed\n");
|
75 |
else {
|
76 |
if (current_migration)
|
77 |
current_migration->release(current_migration); |
78 |
|
79 |
current_migration = s; |
80 |
} |
81 |
} |
82 |
|
83 |
void do_migrate_cancel(Monitor *mon)
|
84 |
{ |
85 |
MigrationState *s = current_migration; |
86 |
|
87 |
if (s)
|
88 |
s->cancel(s); |
89 |
} |
90 |
|
91 |
void do_migrate_set_speed(Monitor *mon, const char *value) |
92 |
{ |
93 |
double d;
|
94 |
char *ptr;
|
95 |
FdMigrationState *s; |
96 |
|
97 |
d = strtod(value, &ptr); |
98 |
switch (*ptr) {
|
99 |
case 'G': case 'g': |
100 |
d *= 1024;
|
101 |
case 'M': case 'm': |
102 |
d *= 1024;
|
103 |
case 'K': case 'k': |
104 |
d *= 1024;
|
105 |
default:
|
106 |
break;
|
107 |
} |
108 |
|
109 |
max_throttle = (uint32_t)d; |
110 |
s = migrate_to_fms(current_migration); |
111 |
|
112 |
if (s) {
|
113 |
qemu_file_set_rate_limit(s->file, max_throttle); |
114 |
} |
115 |
|
116 |
} |
117 |
|
118 |
/* amount of nanoseconds we are willing to wait for migration to be down.
|
119 |
* the choice of nanoseconds is because it is the maximum resolution that
|
120 |
* get_clock() can achieve. It is an internal measure. All user-visible
|
121 |
* units must be in seconds */
|
122 |
static uint64_t max_downtime = 30000000; |
123 |
|
124 |
uint64_t migrate_max_downtime(void)
|
125 |
{ |
126 |
return max_downtime;
|
127 |
} |
128 |
|
129 |
void do_migrate_set_downtime(Monitor *mon, const char *value) |
130 |
{ |
131 |
char *ptr;
|
132 |
double d;
|
133 |
|
134 |
d = strtod(value, &ptr); |
135 |
if (!strcmp(ptr,"ms")) { |
136 |
d *= 1000000;
|
137 |
} else if (!strcmp(ptr,"us")) { |
138 |
d *= 1000;
|
139 |
} else if (!strcmp(ptr,"ns")) { |
140 |
} else {
|
141 |
/* all else considered to be seconds */
|
142 |
d *= 1000000000;
|
143 |
} |
144 |
|
145 |
max_downtime = (uint64_t)d; |
146 |
} |
147 |
|
148 |
void do_info_migrate(Monitor *mon)
|
149 |
{ |
150 |
MigrationState *s = current_migration; |
151 |
|
152 |
if (s) {
|
153 |
monitor_printf(mon, "Migration status: ");
|
154 |
switch (s->get_status(s)) {
|
155 |
case MIG_STATE_ACTIVE:
|
156 |
monitor_printf(mon, "active\n");
|
157 |
monitor_printf(mon, "transferred ram: %" PRIu64 " kbytes\n", ram_bytes_transferred() >> 10); |
158 |
monitor_printf(mon, "remaining ram: %" PRIu64 " kbytes\n", ram_bytes_remaining() >> 10); |
159 |
monitor_printf(mon, "total ram: %" PRIu64 " kbytes\n", ram_bytes_total() >> 10); |
160 |
break;
|
161 |
case MIG_STATE_COMPLETED:
|
162 |
monitor_printf(mon, "completed\n");
|
163 |
break;
|
164 |
case MIG_STATE_ERROR:
|
165 |
monitor_printf(mon, "failed\n");
|
166 |
break;
|
167 |
case MIG_STATE_CANCELLED:
|
168 |
monitor_printf(mon, "cancelled\n");
|
169 |
break;
|
170 |
} |
171 |
} |
172 |
} |
173 |
|
174 |
/* shared migration helpers */
|
175 |
|
176 |
void migrate_fd_monitor_suspend(FdMigrationState *s)
|
177 |
{ |
178 |
s->mon_resume = cur_mon; |
179 |
if (monitor_suspend(cur_mon) == 0) |
180 |
dprintf("suspending monitor\n");
|
181 |
else
|
182 |
monitor_printf(cur_mon, "terminal does not allow synchronous "
|
183 |
"migration, continuing detached\n");
|
184 |
} |
185 |
|
186 |
void migrate_fd_error(FdMigrationState *s)
|
187 |
{ |
188 |
dprintf("setting error state\n");
|
189 |
s->state = MIG_STATE_ERROR; |
190 |
migrate_fd_cleanup(s); |
191 |
} |
192 |
|
193 |
void migrate_fd_cleanup(FdMigrationState *s)
|
194 |
{ |
195 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
196 |
|
197 |
if (s->file) {
|
198 |
dprintf("closing file\n");
|
199 |
qemu_fclose(s->file); |
200 |
} |
201 |
|
202 |
if (s->fd != -1) |
203 |
close(s->fd); |
204 |
|
205 |
/* Don't resume monitor until we've flushed all of the buffers */
|
206 |
if (s->mon_resume)
|
207 |
monitor_resume(s->mon_resume); |
208 |
|
209 |
s->fd = -1;
|
210 |
} |
211 |
|
212 |
void migrate_fd_put_notify(void *opaque) |
213 |
{ |
214 |
FdMigrationState *s = opaque; |
215 |
|
216 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
217 |
qemu_file_put_notify(s->file); |
218 |
} |
219 |
|
220 |
ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size) |
221 |
{ |
222 |
FdMigrationState *s = opaque; |
223 |
ssize_t ret; |
224 |
|
225 |
do {
|
226 |
ret = s->write(s, data, size); |
227 |
} while (ret == -1 && ((s->get_error(s)) == EINTR)); |
228 |
|
229 |
if (ret == -1) |
230 |
ret = -(s->get_error(s)); |
231 |
|
232 |
if (ret == -EAGAIN)
|
233 |
qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s); |
234 |
|
235 |
return ret;
|
236 |
} |
237 |
|
238 |
void migrate_fd_connect(FdMigrationState *s)
|
239 |
{ |
240 |
int ret;
|
241 |
|
242 |
s->file = qemu_fopen_ops_buffered(s, |
243 |
s->bandwidth_limit, |
244 |
migrate_fd_put_buffer, |
245 |
migrate_fd_put_ready, |
246 |
migrate_fd_wait_for_unfreeze, |
247 |
migrate_fd_close); |
248 |
|
249 |
dprintf("beginning savevm\n");
|
250 |
ret = qemu_savevm_state_begin(s->file); |
251 |
if (ret < 0) { |
252 |
dprintf("failed, %d\n", ret);
|
253 |
migrate_fd_error(s); |
254 |
return;
|
255 |
} |
256 |
|
257 |
migrate_fd_put_ready(s); |
258 |
} |
259 |
|
260 |
void migrate_fd_put_ready(void *opaque) |
261 |
{ |
262 |
FdMigrationState *s = opaque; |
263 |
|
264 |
if (s->state != MIG_STATE_ACTIVE) {
|
265 |
dprintf("put_ready returning because of non-active state\n");
|
266 |
return;
|
267 |
} |
268 |
|
269 |
dprintf("iterate\n");
|
270 |
if (qemu_savevm_state_iterate(s->file) == 1) { |
271 |
int state;
|
272 |
int old_vm_running = vm_running;
|
273 |
|
274 |
dprintf("done iterating\n");
|
275 |
vm_stop(0);
|
276 |
|
277 |
qemu_aio_flush(); |
278 |
bdrv_flush_all(); |
279 |
if ((qemu_savevm_state_complete(s->file)) < 0) { |
280 |
if (old_vm_running) {
|
281 |
vm_start(); |
282 |
} |
283 |
state = MIG_STATE_ERROR; |
284 |
} else {
|
285 |
state = MIG_STATE_COMPLETED; |
286 |
} |
287 |
migrate_fd_cleanup(s); |
288 |
s->state = state; |
289 |
} |
290 |
} |
291 |
|
292 |
int migrate_fd_get_status(MigrationState *mig_state)
|
293 |
{ |
294 |
FdMigrationState *s = migrate_to_fms(mig_state); |
295 |
return s->state;
|
296 |
} |
297 |
|
298 |
void migrate_fd_cancel(MigrationState *mig_state)
|
299 |
{ |
300 |
FdMigrationState *s = migrate_to_fms(mig_state); |
301 |
|
302 |
if (s->state != MIG_STATE_ACTIVE)
|
303 |
return;
|
304 |
|
305 |
dprintf("cancelling migration\n");
|
306 |
|
307 |
s->state = MIG_STATE_CANCELLED; |
308 |
|
309 |
migrate_fd_cleanup(s); |
310 |
} |
311 |
|
312 |
void migrate_fd_release(MigrationState *mig_state)
|
313 |
{ |
314 |
FdMigrationState *s = migrate_to_fms(mig_state); |
315 |
|
316 |
dprintf("releasing state\n");
|
317 |
|
318 |
if (s->state == MIG_STATE_ACTIVE) {
|
319 |
s->state = MIG_STATE_CANCELLED; |
320 |
migrate_fd_cleanup(s); |
321 |
} |
322 |
free(s); |
323 |
} |
324 |
|
325 |
void migrate_fd_wait_for_unfreeze(void *opaque) |
326 |
{ |
327 |
FdMigrationState *s = opaque; |
328 |
int ret;
|
329 |
|
330 |
dprintf("wait for unfreeze\n");
|
331 |
if (s->state != MIG_STATE_ACTIVE)
|
332 |
return;
|
333 |
|
334 |
do {
|
335 |
fd_set wfds; |
336 |
|
337 |
FD_ZERO(&wfds); |
338 |
FD_SET(s->fd, &wfds); |
339 |
|
340 |
ret = select(s->fd + 1, NULL, &wfds, NULL, NULL); |
341 |
} while (ret == -1 && (s->get_error(s)) == EINTR); |
342 |
} |
343 |
|
344 |
int migrate_fd_close(void *opaque) |
345 |
{ |
346 |
FdMigrationState *s = opaque; |
347 |
|
348 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
349 |
return s->close(s);
|
350 |
} |