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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
17 #include "qemu-common.h"
18 #include "qapi/qapi-types-migration.h"
19 #include "qemu/thread.h"
20 #include "exec/cpu-common.h"
21 #include "qemu/coroutine_int.h"
22 #include "hw/qdev.h"
23 #include "io/channel.h"
24 #include "net/announce.h"
25
26 struct PostcopyBlocktimeContext;
27
28 #define MIGRATION_RESUME_ACK_VALUE (1)
29
30 /* State for the incoming migration */
31 struct MigrationIncomingState {
32 QEMUFile *from_src_file;
33
34 /*
35 * Free at the start of the main state load, set as the main thread finishes
36 * loading state.
37 */
38 QemuEvent main_thread_load_event;
39
40 /* For network announces */
41 AnnounceTimer announce_timer;
42
43 size_t largest_page_size;
44 bool have_fault_thread;
45 QemuThread fault_thread;
46 QemuSemaphore fault_thread_sem;
47 /* Set this when we want the fault thread to quit */
48 bool fault_thread_quit;
49
50 bool have_listen_thread;
51 QemuThread listen_thread;
52 QemuSemaphore listen_thread_sem;
53
54 /* For the kernel to send us notifications */
55 int userfault_fd;
56 /* To notify the fault_thread to wake, e.g., when need to quit */
57 int userfault_event_fd;
58 QEMUFile *to_src_file;
59 QemuMutex rp_mutex; /* We send replies from multiple threads */
60 /* RAMBlock of last request sent to source */
61 RAMBlock *last_rb;
62 void *postcopy_tmp_page;
63 void *postcopy_tmp_zero_page;
64 /* PostCopyFD's for external userfaultfds & handlers of shared memory */
65 GArray *postcopy_remote_fds;
66
67 QEMUBH *bh;
68
69 int state;
70
71 bool have_colo_incoming_thread;
72 QemuThread colo_incoming_thread;
73 /* The coroutine we should enter (back) after failover */
74 Coroutine *migration_incoming_co;
75 QemuSemaphore colo_incoming_sem;
76
77 /*
78 * PostcopyBlocktimeContext to keep information for postcopy
79 * live migration, to calculate vCPU block time
80 * */
81 struct PostcopyBlocktimeContext *blocktime_ctx;
82
83 /* notify PAUSED postcopy incoming migrations to try to continue */
84 bool postcopy_recover_triggered;
85 QemuSemaphore postcopy_pause_sem_dst;
86 QemuSemaphore postcopy_pause_sem_fault;
87 };
88
89 MigrationIncomingState *migration_incoming_get_current(void);
90 void migration_incoming_state_destroy(void);
91 /*
92 * Functions to work with blocktime context
93 */
94 void fill_destination_postcopy_migration_info(MigrationInfo *info);
95
96 #define TYPE_MIGRATION "migration"
97
98 #define MIGRATION_CLASS(klass) \
99 OBJECT_CLASS_CHECK(MigrationClass, (klass), TYPE_MIGRATION)
100 #define MIGRATION_OBJ(obj) \
101 OBJECT_CHECK(MigrationState, (obj), TYPE_MIGRATION)
102 #define MIGRATION_GET_CLASS(obj) \
103 OBJECT_GET_CLASS(MigrationClass, (obj), TYPE_MIGRATION)
104
105 typedef struct MigrationClass {
106 /*< private >*/
107 DeviceClass parent_class;
108 } MigrationClass;
109
110 struct MigrationState
111 {
112 /*< private >*/
113 DeviceState parent_obj;
114
115 /*< public >*/
116 size_t bytes_xfer;
117 size_t xfer_limit;
118 QemuThread thread;
119 QEMUBH *cleanup_bh;
120 QEMUFile *to_dst_file;
121 /*
122 * Protects to_dst_file pointer. We need to make sure we won't
123 * yield or hang during the critical section, since this lock will
124 * be used in OOB command handler.
125 */
126 QemuMutex qemu_file_lock;
127
128 /*
129 * Used to allow urgent requests to override rate limiting.
130 */
131 QemuSemaphore rate_limit_sem;
132
133 /* pages already send at the beginning of current iteration */
134 uint64_t iteration_initial_pages;
135
136 /* pages transferred per second */
137 double pages_per_second;
138
139 /* bytes already send at the beginning of current iteration */
140 uint64_t iteration_initial_bytes;
141 /* time at the start of current iteration */
142 int64_t iteration_start_time;
143 /*
144 * The final stage happens when the remaining data is smaller than
145 * this threshold; it's calculated from the requested downtime and
146 * measured bandwidth
147 */
148 int64_t threshold_size;
149
150 /* params from 'migrate-set-parameters' */
151 MigrationParameters parameters;
152
153 int state;
154
155 /* State related to return path */
156 struct {
157 QEMUFile *from_dst_file;
158 QemuThread rp_thread;
159 bool error;
160 QemuSemaphore rp_sem;
161 } rp_state;
162
163 double mbps;
164 /* Timestamp when recent migration starts (ms) */
165 int64_t start_time;
166 /* Total time used by latest migration (ms) */
167 int64_t total_time;
168 /* Timestamp when VM is down (ms) to migrate the last stuff */
169 int64_t downtime_start;
170 int64_t downtime;
171 int64_t expected_downtime;
172 bool enabled_capabilities[MIGRATION_CAPABILITY__MAX];
173 int64_t setup_time;
174 /*
175 * Whether guest was running when we enter the completion stage.
176 * If migration is interrupted by any reason, we need to continue
177 * running the guest on source.
178 */
179 bool vm_was_running;
180
181 /* Flag set once the migration has been asked to enter postcopy */
182 bool start_postcopy;
183 /* Flag set after postcopy has sent the device state */
184 bool postcopy_after_devices;
185
186 /* Flag set once the migration thread is running (and needs joining) */
187 bool migration_thread_running;
188
189 /* Flag set once the migration thread called bdrv_inactivate_all */
190 bool block_inactive;
191
192 /* Migration is paused due to pause-before-switchover */
193 QemuSemaphore pause_sem;
194
195 /* The semaphore is used to notify COLO thread that failover is finished */
196 QemuSemaphore colo_exit_sem;
197
198 /* The semaphore is used to notify COLO thread to do checkpoint */
199 QemuSemaphore colo_checkpoint_sem;
200 int64_t colo_checkpoint_time;
201 QEMUTimer *colo_delay_timer;
202
203 /* The first error that has occurred.
204 We used the mutex to be able to return the 1st error message */
205 Error *error;
206 /* mutex to protect errp */
207 QemuMutex error_mutex;
208
209 /* Do we have to clean up -b/-i from old migrate parameters */
210 /* This feature is deprecated and will be removed */
211 bool must_remove_block_options;
212
213 /*
214 * Global switch on whether we need to store the global state
215 * during migration.
216 */
217 bool store_global_state;
218
219 /* Whether the VM is only allowing for migratable devices */
220 bool only_migratable;
221
222 /* Whether we send QEMU_VM_CONFIGURATION during migration */
223 bool send_configuration;
224 /* Whether we send section footer during migration */
225 bool send_section_footer;
226
227 /* Needed by postcopy-pause state */
228 QemuSemaphore postcopy_pause_sem;
229 QemuSemaphore postcopy_pause_rp_sem;
230 /*
231 * Whether we abort the migration if decompression errors are
232 * detected at the destination. It is left at false for qemu
233 * older than 3.0, since only newer qemu sends streams that
234 * do not trigger spurious decompression errors.
235 */
236 bool decompress_error_check;
237 };
238
239 void migrate_set_state(int *state, int old_state, int new_state);
240
241 void migration_fd_process_incoming(QEMUFile *f);
242 void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp);
243 void migration_incoming_process(void);
244
245 bool migration_has_all_channels(void);
246
247 uint64_t migrate_max_downtime(void);
248
249 void migrate_set_error(MigrationState *s, const Error *error);
250 void migrate_fd_error(MigrationState *s, const Error *error);
251
252 void migrate_fd_connect(MigrationState *s, Error *error_in);
253
254 bool migration_is_setup_or_active(int state);
255
256 void migrate_init(MigrationState *s);
257 bool migration_is_blocked(Error **errp);
258 /* True if outgoing migration has entered postcopy phase */
259 bool migration_in_postcopy(void);
260 MigrationState *migrate_get_current(void);
261
262 bool migrate_postcopy(void);
263
264 bool migrate_release_ram(void);
265 bool migrate_postcopy_ram(void);
266 bool migrate_zero_blocks(void);
267 bool migrate_dirty_bitmaps(void);
268 bool migrate_ignore_shared(void);
269
270 bool migrate_auto_converge(void);
271 bool migrate_use_multifd(void);
272 bool migrate_pause_before_switchover(void);
273 int migrate_multifd_channels(void);
274 int migrate_multifd_page_count(void);
275
276 int migrate_use_xbzrle(void);
277 int64_t migrate_xbzrle_cache_size(void);
278 bool migrate_colo_enabled(void);
279
280 bool migrate_use_block(void);
281 bool migrate_use_block_incremental(void);
282 int migrate_max_cpu_throttle(void);
283 bool migrate_use_return_path(void);
284
285 uint64_t ram_get_total_transferred_pages(void);
286
287 bool migrate_use_compression(void);
288 int migrate_compress_level(void);
289 int migrate_compress_threads(void);
290 int migrate_compress_wait_thread(void);
291 int migrate_decompress_threads(void);
292 bool migrate_use_events(void);
293 bool migrate_postcopy_blocktime(void);
294
295 /* Sending on the return path - generic and then for each message type */
296 void migrate_send_rp_shut(MigrationIncomingState *mis,
297 uint32_t value);
298 void migrate_send_rp_pong(MigrationIncomingState *mis,
299 uint32_t value);
300 int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname,
301 ram_addr_t start, size_t len);
302 void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis,
303 char *block_name);
304 void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value);
305
306 void dirty_bitmap_mig_before_vm_start(void);
307 void init_dirty_bitmap_incoming_migration(void);
308
309 #define qemu_ram_foreach_block \
310 #warning "Use qemu_ram_foreach_block_migratable in migration code"
311
312 void migration_make_urgent_request(void);
313 void migration_consume_urgent_request(void);
314
315 #endif