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1 | 5bb7910a | aliguori | /*
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2 | 5bb7910a | aliguori | * QEMU live migration
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3 | 5bb7910a | aliguori | *
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4 | 5bb7910a | aliguori | * Copyright IBM, Corp. 2008
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5 | 5bb7910a | aliguori | *
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6 | 5bb7910a | aliguori | * Authors:
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7 | 5bb7910a | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 5bb7910a | aliguori | *
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9 | 5bb7910a | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 5bb7910a | aliguori | * the COPYING file in the top-level directory.
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11 | 5bb7910a | aliguori | *
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12 | 5bb7910a | aliguori | */
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13 | 5bb7910a | aliguori | |
14 | 5bb7910a | aliguori | #include "qemu-common.h" |
15 | 5bb7910a | aliguori | #include "migration.h" |
16 | 376253ec | aliguori | #include "monitor.h" |
17 | 065e2813 | aliguori | #include "buffered_file.h" |
18 | 065e2813 | aliguori | #include "sysemu.h" |
19 | 065e2813 | aliguori | #include "block.h" |
20 | 065e2813 | aliguori | #include "qemu_socket.h" |
21 | 065e2813 | aliguori | |
22 | 065e2813 | aliguori | //#define DEBUG_MIGRATION
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23 | 065e2813 | aliguori | |
24 | 065e2813 | aliguori | #ifdef DEBUG_MIGRATION
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25 | 065e2813 | aliguori | #define dprintf(fmt, ...) \
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26 | 065e2813 | aliguori | do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) |
27 | 065e2813 | aliguori | #else
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28 | 065e2813 | aliguori | #define dprintf(fmt, ...) \
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29 | 065e2813 | aliguori | do { } while (0) |
30 | 065e2813 | aliguori | #endif
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31 | 5bb7910a | aliguori | |
32 | 5bb7910a | aliguori | /* Migration speed throttling */
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33 | 5bb7910a | aliguori | static uint32_t max_throttle = (32 << 20); |
34 | 5bb7910a | aliguori | |
35 | 5bb7910a | aliguori | static MigrationState *current_migration;
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36 | 5bb7910a | aliguori | |
37 | 5bb7910a | aliguori | void qemu_start_incoming_migration(const char *uri) |
38 | 5bb7910a | aliguori | { |
39 | 34c9dd8e | aliguori | const char *p; |
40 | 34c9dd8e | aliguori | |
41 | 34c9dd8e | aliguori | if (strstart(uri, "tcp:", &p)) |
42 | 34c9dd8e | aliguori | tcp_start_incoming_migration(p); |
43 | 065e2813 | aliguori | #if !defined(WIN32)
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44 | 065e2813 | aliguori | else if (strstart(uri, "exec:", &p)) |
45 | 065e2813 | aliguori | exec_start_incoming_migration(p); |
46 | 065e2813 | aliguori | #endif
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47 | 34c9dd8e | aliguori | else
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48 | 34c9dd8e | aliguori | fprintf(stderr, "unknown migration protocol: %s\n", uri);
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49 | 5bb7910a | aliguori | } |
50 | 5bb7910a | aliguori | |
51 | 376253ec | aliguori | void do_migrate(Monitor *mon, int detach, const char *uri) |
52 | 5bb7910a | aliguori | { |
53 | 34c9dd8e | aliguori | MigrationState *s = NULL;
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54 | 34c9dd8e | aliguori | const char *p; |
55 | 34c9dd8e | aliguori | |
56 | 34c9dd8e | aliguori | if (strstart(uri, "tcp:", &p)) |
57 | ff8d81d8 | aliguori | s = tcp_start_outgoing_migration(p, max_throttle, detach); |
58 | 065e2813 | aliguori | #if !defined(WIN32)
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59 | 065e2813 | aliguori | else if (strstart(uri, "exec:", &p)) |
60 | 065e2813 | aliguori | s = exec_start_outgoing_migration(p, max_throttle, detach); |
61 | 065e2813 | aliguori | #endif
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62 | 34c9dd8e | aliguori | else
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63 | 376253ec | aliguori | monitor_printf(mon, "unknown migration protocol: %s\n", uri);
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64 | 34c9dd8e | aliguori | |
65 | 34c9dd8e | aliguori | if (s == NULL) |
66 | 376253ec | aliguori | monitor_printf(mon, "migration failed\n");
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67 | 34c9dd8e | aliguori | else {
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68 | ff8d81d8 | aliguori | if (current_migration)
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69 | ff8d81d8 | aliguori | current_migration->release(current_migration); |
70 | 34c9dd8e | aliguori | |
71 | ff8d81d8 | aliguori | current_migration = s; |
72 | 34c9dd8e | aliguori | } |
73 | 5bb7910a | aliguori | } |
74 | 5bb7910a | aliguori | |
75 | 376253ec | aliguori | void do_migrate_cancel(Monitor *mon)
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76 | 5bb7910a | aliguori | { |
77 | 5bb7910a | aliguori | MigrationState *s = current_migration; |
78 | 5bb7910a | aliguori | |
79 | 5bb7910a | aliguori | if (s)
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80 | ff8d81d8 | aliguori | s->cancel(s); |
81 | 5bb7910a | aliguori | } |
82 | 5bb7910a | aliguori | |
83 | 376253ec | aliguori | void do_migrate_set_speed(Monitor *mon, const char *value) |
84 | 5bb7910a | aliguori | { |
85 | 5bb7910a | aliguori | double d;
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86 | 5bb7910a | aliguori | char *ptr;
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87 | 5bb7910a | aliguori | |
88 | 5bb7910a | aliguori | d = strtod(value, &ptr); |
89 | 5bb7910a | aliguori | switch (*ptr) {
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90 | 5bb7910a | aliguori | case 'G': case 'g': |
91 | ff8d81d8 | aliguori | d *= 1024;
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92 | 5bb7910a | aliguori | case 'M': case 'm': |
93 | ff8d81d8 | aliguori | d *= 1024;
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94 | 5bb7910a | aliguori | case 'K': case 'k': |
95 | ff8d81d8 | aliguori | d *= 1024;
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96 | 5bb7910a | aliguori | default:
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97 | ff8d81d8 | aliguori | break;
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98 | 5bb7910a | aliguori | } |
99 | 5bb7910a | aliguori | |
100 | 5bb7910a | aliguori | max_throttle = (uint32_t)d; |
101 | 5bb7910a | aliguori | } |
102 | 5bb7910a | aliguori | |
103 | 376253ec | aliguori | void do_info_migrate(Monitor *mon)
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104 | 5bb7910a | aliguori | { |
105 | 5bb7910a | aliguori | MigrationState *s = current_migration; |
106 | 376253ec | aliguori | |
107 | 5bb7910a | aliguori | if (s) {
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108 | 376253ec | aliguori | monitor_printf(mon, "Migration status: ");
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109 | ff8d81d8 | aliguori | switch (s->get_status(s)) {
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110 | ff8d81d8 | aliguori | case MIG_STATE_ACTIVE:
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111 | 376253ec | aliguori | monitor_printf(mon, "active\n");
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112 | ff8d81d8 | aliguori | break;
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113 | ff8d81d8 | aliguori | case MIG_STATE_COMPLETED:
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114 | 376253ec | aliguori | monitor_printf(mon, "completed\n");
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115 | ff8d81d8 | aliguori | break;
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116 | ff8d81d8 | aliguori | case MIG_STATE_ERROR:
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117 | 376253ec | aliguori | monitor_printf(mon, "failed\n");
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118 | ff8d81d8 | aliguori | break;
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119 | ff8d81d8 | aliguori | case MIG_STATE_CANCELLED:
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120 | 376253ec | aliguori | monitor_printf(mon, "cancelled\n");
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121 | ff8d81d8 | aliguori | break;
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122 | ff8d81d8 | aliguori | } |
123 | 5bb7910a | aliguori | } |
124 | 5bb7910a | aliguori | } |
125 | 5bb7910a | aliguori | |
126 | 065e2813 | aliguori | /* shared migration helpers */
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127 | 065e2813 | aliguori | |
128 | 731b0364 | aliguori | void migrate_fd_monitor_suspend(FdMigrationState *s)
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129 | 731b0364 | aliguori | { |
130 | 731b0364 | aliguori | s->mon_resume = cur_mon; |
131 | cde76ee1 | aliguori | if (monitor_suspend(cur_mon) == 0) |
132 | cde76ee1 | aliguori | dprintf("suspending monitor\n");
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133 | cde76ee1 | aliguori | else
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134 | cde76ee1 | aliguori | monitor_printf(cur_mon, "terminal does not allow synchronous "
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135 | cde76ee1 | aliguori | "migration, continuing detached\n");
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136 | 731b0364 | aliguori | } |
137 | 731b0364 | aliguori | |
138 | 065e2813 | aliguori | void migrate_fd_error(FdMigrationState *s)
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139 | 065e2813 | aliguori | { |
140 | 065e2813 | aliguori | dprintf("setting error state\n");
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141 | 065e2813 | aliguori | s->state = MIG_STATE_ERROR; |
142 | 065e2813 | aliguori | migrate_fd_cleanup(s); |
143 | 065e2813 | aliguori | } |
144 | 065e2813 | aliguori | |
145 | 065e2813 | aliguori | void migrate_fd_cleanup(FdMigrationState *s)
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146 | 065e2813 | aliguori | { |
147 | 065e2813 | aliguori | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
148 | 065e2813 | aliguori | |
149 | 065e2813 | aliguori | if (s->file) {
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150 | 065e2813 | aliguori | dprintf("closing file\n");
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151 | 065e2813 | aliguori | qemu_fclose(s->file); |
152 | 065e2813 | aliguori | } |
153 | 065e2813 | aliguori | |
154 | 065e2813 | aliguori | if (s->fd != -1) |
155 | 065e2813 | aliguori | close(s->fd); |
156 | 065e2813 | aliguori | |
157 | 065e2813 | aliguori | /* Don't resume monitor until we've flushed all of the buffers */
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158 | 731b0364 | aliguori | if (s->mon_resume)
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159 | 731b0364 | aliguori | monitor_resume(s->mon_resume); |
160 | 065e2813 | aliguori | |
161 | 065e2813 | aliguori | s->fd = -1;
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162 | 065e2813 | aliguori | } |
163 | 065e2813 | aliguori | |
164 | 065e2813 | aliguori | void migrate_fd_put_notify(void *opaque) |
165 | 065e2813 | aliguori | { |
166 | 065e2813 | aliguori | FdMigrationState *s = opaque; |
167 | 065e2813 | aliguori | |
168 | 065e2813 | aliguori | qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
169 | 065e2813 | aliguori | qemu_file_put_notify(s->file); |
170 | 065e2813 | aliguori | } |
171 | 065e2813 | aliguori | |
172 | 065e2813 | aliguori | ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size) |
173 | 065e2813 | aliguori | { |
174 | 065e2813 | aliguori | FdMigrationState *s = opaque; |
175 | 065e2813 | aliguori | ssize_t ret; |
176 | 065e2813 | aliguori | |
177 | 065e2813 | aliguori | do {
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178 | 065e2813 | aliguori | ret = s->write(s, data, size); |
179 | 065e2813 | aliguori | } while (ret == -1 && ((s->get_error(s)) == EINTR || (s->get_error(s)) == EWOULDBLOCK)); |
180 | 065e2813 | aliguori | |
181 | 065e2813 | aliguori | if (ret == -1) |
182 | 065e2813 | aliguori | ret = -(s->get_error(s)); |
183 | 065e2813 | aliguori | |
184 | 065e2813 | aliguori | if (ret == -EAGAIN)
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185 | 065e2813 | aliguori | qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s); |
186 | 065e2813 | aliguori | |
187 | 065e2813 | aliguori | return ret;
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188 | 065e2813 | aliguori | } |
189 | 065e2813 | aliguori | |
190 | 065e2813 | aliguori | void migrate_fd_connect(FdMigrationState *s)
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191 | 065e2813 | aliguori | { |
192 | 065e2813 | aliguori | int ret;
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193 | 065e2813 | aliguori | |
194 | 065e2813 | aliguori | s->file = qemu_fopen_ops_buffered(s, |
195 | 065e2813 | aliguori | s->bandwidth_limit, |
196 | 065e2813 | aliguori | migrate_fd_put_buffer, |
197 | 065e2813 | aliguori | migrate_fd_put_ready, |
198 | 065e2813 | aliguori | migrate_fd_wait_for_unfreeze, |
199 | 065e2813 | aliguori | migrate_fd_close); |
200 | 065e2813 | aliguori | |
201 | 065e2813 | aliguori | dprintf("beginning savevm\n");
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202 | 065e2813 | aliguori | ret = qemu_savevm_state_begin(s->file); |
203 | 065e2813 | aliguori | if (ret < 0) { |
204 | 065e2813 | aliguori | dprintf("failed, %d\n", ret);
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205 | 065e2813 | aliguori | migrate_fd_error(s); |
206 | 065e2813 | aliguori | return;
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207 | 065e2813 | aliguori | } |
208 | 065e2813 | aliguori | |
209 | 065e2813 | aliguori | migrate_fd_put_ready(s); |
210 | 065e2813 | aliguori | } |
211 | 065e2813 | aliguori | |
212 | 065e2813 | aliguori | void migrate_fd_put_ready(void *opaque) |
213 | 065e2813 | aliguori | { |
214 | 065e2813 | aliguori | FdMigrationState *s = opaque; |
215 | 065e2813 | aliguori | |
216 | 065e2813 | aliguori | if (s->state != MIG_STATE_ACTIVE) {
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217 | 065e2813 | aliguori | dprintf("put_ready returning because of non-active state\n");
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218 | 065e2813 | aliguori | return;
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219 | 065e2813 | aliguori | } |
220 | 065e2813 | aliguori | |
221 | 065e2813 | aliguori | dprintf("iterate\n");
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222 | 065e2813 | aliguori | if (qemu_savevm_state_iterate(s->file) == 1) { |
223 | b161d123 | aliguori | int state;
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224 | 065e2813 | aliguori | dprintf("done iterating\n");
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225 | 065e2813 | aliguori | vm_stop(0);
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226 | 065e2813 | aliguori | |
227 | 065e2813 | aliguori | bdrv_flush_all(); |
228 | b161d123 | aliguori | if ((qemu_savevm_state_complete(s->file)) < 0) { |
229 | b161d123 | aliguori | vm_start(); |
230 | b161d123 | aliguori | state = MIG_STATE_ERROR; |
231 | b161d123 | aliguori | } else {
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232 | b161d123 | aliguori | state = MIG_STATE_COMPLETED; |
233 | b161d123 | aliguori | } |
234 | 065e2813 | aliguori | migrate_fd_cleanup(s); |
235 | b161d123 | aliguori | s->state = state; |
236 | 065e2813 | aliguori | } |
237 | 065e2813 | aliguori | } |
238 | 065e2813 | aliguori | |
239 | 065e2813 | aliguori | int migrate_fd_get_status(MigrationState *mig_state)
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240 | 065e2813 | aliguori | { |
241 | 065e2813 | aliguori | FdMigrationState *s = migrate_to_fms(mig_state); |
242 | 065e2813 | aliguori | return s->state;
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243 | 065e2813 | aliguori | } |
244 | 065e2813 | aliguori | |
245 | 065e2813 | aliguori | void migrate_fd_cancel(MigrationState *mig_state)
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246 | 065e2813 | aliguori | { |
247 | 065e2813 | aliguori | FdMigrationState *s = migrate_to_fms(mig_state); |
248 | 065e2813 | aliguori | |
249 | 065e2813 | aliguori | if (s->state != MIG_STATE_ACTIVE)
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250 | 065e2813 | aliguori | return;
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251 | 065e2813 | aliguori | |
252 | 065e2813 | aliguori | dprintf("cancelling migration\n");
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253 | 065e2813 | aliguori | |
254 | 065e2813 | aliguori | s->state = MIG_STATE_CANCELLED; |
255 | 065e2813 | aliguori | |
256 | 065e2813 | aliguori | migrate_fd_cleanup(s); |
257 | 065e2813 | aliguori | } |
258 | 065e2813 | aliguori | |
259 | 065e2813 | aliguori | void migrate_fd_release(MigrationState *mig_state)
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260 | 065e2813 | aliguori | { |
261 | 065e2813 | aliguori | FdMigrationState *s = migrate_to_fms(mig_state); |
262 | 065e2813 | aliguori | |
263 | 065e2813 | aliguori | dprintf("releasing state\n");
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264 | 065e2813 | aliguori | |
265 | 065e2813 | aliguori | if (s->state == MIG_STATE_ACTIVE) {
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266 | 065e2813 | aliguori | s->state = MIG_STATE_CANCELLED; |
267 | 065e2813 | aliguori | migrate_fd_cleanup(s); |
268 | 065e2813 | aliguori | } |
269 | 065e2813 | aliguori | free(s); |
270 | 065e2813 | aliguori | } |
271 | 065e2813 | aliguori | |
272 | 065e2813 | aliguori | void migrate_fd_wait_for_unfreeze(void *opaque) |
273 | 065e2813 | aliguori | { |
274 | 065e2813 | aliguori | FdMigrationState *s = opaque; |
275 | 065e2813 | aliguori | int ret;
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276 | 065e2813 | aliguori | |
277 | 065e2813 | aliguori | dprintf("wait for unfreeze\n");
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278 | 065e2813 | aliguori | if (s->state != MIG_STATE_ACTIVE)
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279 | 065e2813 | aliguori | return;
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280 | 065e2813 | aliguori | |
281 | 065e2813 | aliguori | do {
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282 | 065e2813 | aliguori | fd_set wfds; |
283 | 065e2813 | aliguori | |
284 | 065e2813 | aliguori | FD_ZERO(&wfds); |
285 | 065e2813 | aliguori | FD_SET(s->fd, &wfds); |
286 | 065e2813 | aliguori | |
287 | 065e2813 | aliguori | ret = select(s->fd + 1, NULL, &wfds, NULL, NULL); |
288 | 065e2813 | aliguori | } while (ret == -1 && (s->get_error(s)) == EINTR); |
289 | 065e2813 | aliguori | } |
290 | 065e2813 | aliguori | |
291 | 065e2813 | aliguori | int migrate_fd_close(void *opaque) |
292 | 065e2813 | aliguori | { |
293 | 065e2813 | aliguori | FdMigrationState *s = opaque; |
294 | 065e2813 | aliguori | return s->close(s);
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295 | 065e2813 | aliguori | } |