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Commit | Line | Data |
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5bb7910a AL |
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 | #ifndef QEMU_MIGRATION_H | |
15 | #define QEMU_MIGRATION_H | |
16 | ||
376253ec | 17 | #include "qemu-common.h" |
9af23989 | 18 | #include "qapi/qapi-types-migration.h" |
9848a404 | 19 | #include "qemu/thread.h" |
43487c67 | 20 | #include "exec/cpu-common.h" |
25d0c16f | 21 | #include "qemu/coroutine_int.h" |
e5cb7e76 | 22 | #include "hw/qdev.h" |
4f0fae7f | 23 | #include "io/channel.h" |
376253ec | 24 | |
2a4c42f1 AP |
25 | struct PostcopyBlocktimeContext; |
26 | ||
13955b89 PX |
27 | #define MIGRATION_RESUME_ACK_VALUE (1) |
28 | ||
bca7856a DDAG |
29 | /* State for the incoming migration */ |
30 | struct MigrationIncomingState { | |
42e2aa56 | 31 | QEMUFile *from_src_file; |
1a8f46f8 | 32 | |
7b89bf27 DDAG |
33 | /* |
34 | * Free at the start of the main state load, set as the main thread finishes | |
35 | * loading state. | |
36 | */ | |
37 | QemuEvent main_thread_load_event; | |
38 | ||
67f11b5c | 39 | size_t largest_page_size; |
c4faeed2 | 40 | bool have_fault_thread; |
f0a227ad DDAG |
41 | QemuThread fault_thread; |
42 | QemuSemaphore fault_thread_sem; | |
64f615fe PX |
43 | /* Set this when we want the fault thread to quit */ |
44 | bool fault_thread_quit; | |
f0a227ad | 45 | |
c76201ab DDAG |
46 | bool have_listen_thread; |
47 | QemuThread listen_thread; | |
48 | QemuSemaphore listen_thread_sem; | |
49 | ||
1caddf8a DDAG |
50 | /* For the kernel to send us notifications */ |
51 | int userfault_fd; | |
64f615fe PX |
52 | /* To notify the fault_thread to wake, e.g., when need to quit */ |
53 | int userfault_event_fd; | |
2e37701e | 54 | QEMUFile *to_src_file; |
6decec93 | 55 | QemuMutex rp_mutex; /* We send replies from multiple threads */ |
096bf4c8 DDAG |
56 | /* RAMBlock of last request sent to source */ |
57 | RAMBlock *last_rb; | |
696ed9a9 | 58 | void *postcopy_tmp_page; |
41d84210 | 59 | void *postcopy_tmp_zero_page; |
00fa4fc8 DDAG |
60 | /* PostCopyFD's for external userfaultfds & handlers of shared memory */ |
61 | GArray *postcopy_remote_fds; | |
2e37701e | 62 | |
0aa6aefc DL |
63 | QEMUBH *bh; |
64 | ||
93d7af6f | 65 | int state; |
25d0c16f HZ |
66 | |
67 | bool have_colo_incoming_thread; | |
68 | QemuThread colo_incoming_thread; | |
69 | /* The coroutine we should enter (back) after failover */ | |
70 | Coroutine *migration_incoming_co; | |
c937b9a6 | 71 | QemuSemaphore colo_incoming_sem; |
2a4c42f1 AP |
72 | |
73 | /* | |
74 | * PostcopyBlocktimeContext to keep information for postcopy | |
75 | * live migration, to calculate vCPU block time | |
76 | * */ | |
77 | struct PostcopyBlocktimeContext *blocktime_ctx; | |
b411b844 PX |
78 | |
79 | /* notify PAUSED postcopy incoming migrations to try to continue */ | |
80 | QemuSemaphore postcopy_pause_sem_dst; | |
3a7804c3 | 81 | QemuSemaphore postcopy_pause_sem_fault; |
bca7856a DDAG |
82 | }; |
83 | ||
84 | MigrationIncomingState *migration_incoming_get_current(void); | |
bca7856a | 85 | void migration_incoming_state_destroy(void); |
65ace060 AP |
86 | /* |
87 | * Functions to work with blocktime context | |
88 | */ | |
89 | void fill_destination_postcopy_migration_info(MigrationInfo *info); | |
bca7856a | 90 | |
e5cb7e76 PX |
91 | #define TYPE_MIGRATION "migration" |
92 | ||
93 | #define MIGRATION_CLASS(klass) \ | |
94 | OBJECT_CLASS_CHECK(MigrationClass, (klass), TYPE_MIGRATION) | |
95 | #define MIGRATION_OBJ(obj) \ | |
96 | OBJECT_CHECK(MigrationState, (obj), TYPE_MIGRATION) | |
97 | #define MIGRATION_GET_CLASS(obj) \ | |
98 | OBJECT_GET_CLASS(MigrationClass, (obj), TYPE_MIGRATION) | |
99 | ||
100 | typedef struct MigrationClass { | |
101 | /*< private >*/ | |
102 | DeviceClass parent_class; | |
103 | } MigrationClass; | |
104 | ||
22f00a44 | 105 | struct MigrationState |
065e2813 | 106 | { |
e5cb7e76 PX |
107 | /*< private >*/ |
108 | DeviceState parent_obj; | |
109 | ||
110 | /*< public >*/ | |
9848a404 JQ |
111 | size_t bytes_xfer; |
112 | size_t xfer_limit; | |
9848a404 | 113 | QemuThread thread; |
bb1fadc4 | 114 | QEMUBH *cleanup_bh; |
89a02a9f | 115 | QEMUFile *to_dst_file; |
2594f56d | 116 | |
b15df1ae PX |
117 | /* bytes already send at the beggining of current interation */ |
118 | uint64_t iteration_initial_bytes; | |
119 | /* time at the start of current iteration */ | |
120 | int64_t iteration_start_time; | |
121 | /* | |
122 | * The final stage happens when the remaining data is smaller than | |
123 | * this threshold; it's calculated from the requested downtime and | |
124 | * measured bandwidth | |
125 | */ | |
126 | int64_t threshold_size; | |
127 | ||
a0762d9e | 128 | /* params from 'migrate-set-parameters' */ |
2594f56d | 129 | MigrationParameters parameters; |
f8bbc128 | 130 | |
f8bbc128 | 131 | int state; |
70b20477 DDAG |
132 | |
133 | /* State related to return path */ | |
134 | struct { | |
135 | QEMUFile *from_dst_file; | |
136 | QemuThread rp_thread; | |
137 | bool error; | |
138 | } rp_state; | |
139 | ||
7e114f8c | 140 | double mbps; |
4af246a3 PX |
141 | /* Timestamp when recent migration starts (ms) */ |
142 | int64_t start_time; | |
143 | /* Total time used by latest migration (ms) */ | |
d5f8a570 | 144 | int64_t total_time; |
64909f97 PX |
145 | /* Timestamp when VM is down (ms) to migrate the last stuff */ |
146 | int64_t downtime_start; | |
9c5a9fcf | 147 | int64_t downtime; |
2c52ddf1 | 148 | int64_t expected_downtime; |
7fb1cf16 | 149 | bool enabled_capabilities[MIGRATION_CAPABILITY__MAX]; |
ed4fbd10 | 150 | int64_t setup_time; |
7287cbd4 PX |
151 | /* |
152 | * Whether guest was running when we enter the completion stage. | |
153 | * If migration is interrupted by any reason, we need to continue | |
154 | * running the guest on source. | |
155 | */ | |
156 | bool vm_was_running; | |
4886a1bc DDAG |
157 | |
158 | /* Flag set once the migration has been asked to enter postcopy */ | |
159 | bool start_postcopy; | |
b82fc321 DDAG |
160 | /* Flag set after postcopy has sent the device state */ |
161 | bool postcopy_after_devices; | |
1d34e4bf DDAG |
162 | |
163 | /* Flag set once the migration thread is running (and needs joining) */ | |
164 | bool migration_thread_running; | |
6c595cde | 165 | |
1d2acc31 HZ |
166 | /* Flag set once the migration thread called bdrv_inactivate_all */ |
167 | bool block_inactive; | |
168 | ||
e91d8951 DDAG |
169 | /* Migration is paused due to pause-before-switchover */ |
170 | QemuSemaphore pause_sem; | |
171 | ||
c937b9a6 HZ |
172 | /* The semaphore is used to notify COLO thread that failover is finished */ |
173 | QemuSemaphore colo_exit_sem; | |
d59ce6f3 | 174 | |
479125d5 HZ |
175 | /* The semaphore is used to notify COLO thread to do checkpoint */ |
176 | QemuSemaphore colo_checkpoint_sem; | |
177 | int64_t colo_checkpoint_time; | |
178 | QEMUTimer *colo_delay_timer; | |
179 | ||
87db1a7d JQ |
180 | /* The first error that has occurred. |
181 | We used the mutex to be able to return the 1st error message */ | |
d59ce6f3 | 182 | Error *error; |
87db1a7d JQ |
183 | /* mutex to protect errp */ |
184 | QemuMutex error_mutex; | |
185 | ||
2833c59b JQ |
186 | /* Do we have to clean up -b/-i from old migrate parameters */ |
187 | /* This feature is deprecated and will be removed */ | |
188 | bool must_remove_block_options; | |
5272298c PX |
189 | |
190 | /* | |
191 | * Global switch on whether we need to store the global state | |
192 | * during migration. | |
193 | */ | |
194 | bool store_global_state; | |
3df663e5 PX |
195 | |
196 | /* Whether the VM is only allowing for migratable devices */ | |
197 | bool only_migratable; | |
71dd4c1a PX |
198 | |
199 | /* Whether we send QEMU_VM_CONFIGURATION during migration */ | |
200 | bool send_configuration; | |
15c38503 PX |
201 | /* Whether we send section footer during migration */ |
202 | bool send_section_footer; | |
b23c2ade PX |
203 | |
204 | /* Needed by postcopy-pause state */ | |
205 | QemuSemaphore postcopy_pause_sem; | |
14b1742e | 206 | QemuSemaphore postcopy_pause_rp_sem; |
065e2813 AL |
207 | }; |
208 | ||
48781e5b HZ |
209 | void migrate_set_state(int *state, int old_state, int new_state); |
210 | ||
22724f49 | 211 | void migration_fd_process_incoming(QEMUFile *f); |
4f0fae7f | 212 | void migration_ioc_process_incoming(QIOChannel *ioc); |
36c2f8be | 213 | void migration_incoming_process(void); |
511c0231 | 214 | |
428d8908 JQ |
215 | bool migration_has_all_channels(void); |
216 | ||
a0a3fd60 GC |
217 | uint64_t migrate_max_downtime(void); |
218 | ||
87db1a7d | 219 | void migrate_set_error(MigrationState *s, const Error *error); |
d59ce6f3 | 220 | void migrate_fd_error(MigrationState *s, const Error *error); |
065e2813 | 221 | |
cce8040b | 222 | void migrate_fd_connect(MigrationState *s, Error *error_in); |
065e2813 | 223 | |
3e0c8050 | 224 | void migrate_init(MigrationState *s); |
24f3902b | 225 | bool migration_is_blocked(Error **errp); |
9ec055ae | 226 | /* True if outgoing migration has entered postcopy phase */ |
5727309d | 227 | bool migration_in_postcopy(void); |
859bc756 | 228 | MigrationState *migrate_get_current(void); |
99a0db9b | 229 | |
58110f0a VSO |
230 | bool migrate_postcopy(void); |
231 | ||
53f09a10 | 232 | bool migrate_release_ram(void); |
53dd370c | 233 | bool migrate_postcopy_ram(void); |
323004a3 | 234 | bool migrate_zero_blocks(void); |
55efc8c2 | 235 | bool migrate_dirty_bitmaps(void); |
60d9222c | 236 | |
bde1e2ec | 237 | bool migrate_auto_converge(void); |
30126bbf | 238 | bool migrate_use_multifd(void); |
93fbd031 | 239 | bool migrate_pause_before_switchover(void); |
4075fb1c | 240 | int migrate_multifd_channels(void); |
0fb86605 | 241 | int migrate_multifd_page_count(void); |
bde1e2ec | 242 | |
17ad9b35 OW |
243 | int migrate_use_xbzrle(void); |
244 | int64_t migrate_xbzrle_cache_size(void); | |
35a6ed4f | 245 | bool migrate_colo_enabled(void); |
17ad9b35 | 246 | |
2833c59b JQ |
247 | bool migrate_use_block(void); |
248 | bool migrate_use_block_incremental(void); | |
c788ada8 | 249 | bool migrate_use_return_path(void); |
2833c59b | 250 | |
8706d2d5 LL |
251 | bool migrate_use_compression(void); |
252 | int migrate_compress_level(void); | |
253 | int migrate_compress_threads(void); | |
3fcb38c2 | 254 | int migrate_decompress_threads(void); |
b05dc723 | 255 | bool migrate_use_events(void); |
f22f928e | 256 | bool migrate_postcopy_blocktime(void); |
8706d2d5 | 257 | |
6decec93 | 258 | /* Sending on the return path - generic and then for each message type */ |
6decec93 DDAG |
259 | void migrate_send_rp_shut(MigrationIncomingState *mis, |
260 | uint32_t value); | |
261 | void migrate_send_rp_pong(MigrationIncomingState *mis, | |
262 | uint32_t value); | |
d6208e35 | 263 | int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname, |
1e2d90eb | 264 | ram_addr_t start, size_t len); |
a335debb PX |
265 | void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis, |
266 | char *block_name); | |
13955b89 | 267 | void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value); |
6decec93 | 268 | |
b35ebdf0 VSO |
269 | void dirty_bitmap_mig_before_vm_start(void); |
270 | void init_dirty_bitmap_incoming_migration(void); | |
271 | ||
5bb7910a | 272 | #endif |