4 * Copyright IBM, Corp. 2008
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #ifndef QEMU_MIGRATION_H
15 #define QEMU_MIGRATION_H
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"
23 #include "io/channel.h"
25 struct PostcopyBlocktimeContext;
27 /* State for the incoming migration */
28 struct MigrationIncomingState {
29 QEMUFile *from_src_file;
32 * Free at the start of the main state load, set as the main thread finishes
35 QemuEvent main_thread_load_event;
37 size_t largest_page_size;
38 bool have_fault_thread;
39 QemuThread fault_thread;
40 QemuSemaphore fault_thread_sem;
41 /* Set this when we want the fault thread to quit */
42 bool fault_thread_quit;
44 bool have_listen_thread;
45 QemuThread listen_thread;
46 QemuSemaphore listen_thread_sem;
48 /* For the kernel to send us notifications */
50 /* To notify the fault_thread to wake, e.g., when need to quit */
51 int userfault_event_fd;
52 QEMUFile *to_src_file;
53 QemuMutex rp_mutex; /* We send replies from multiple threads */
54 /* RAMBlock of last request sent to source */
56 void *postcopy_tmp_page;
57 void *postcopy_tmp_zero_page;
58 /* PostCopyFD's for external userfaultfds & handlers of shared memory */
59 GArray *postcopy_remote_fds;
65 bool have_colo_incoming_thread;
66 QemuThread colo_incoming_thread;
67 /* The coroutine we should enter (back) after failover */
68 Coroutine *migration_incoming_co;
69 QemuSemaphore colo_incoming_sem;
72 * PostcopyBlocktimeContext to keep information for postcopy
73 * live migration, to calculate vCPU block time
75 struct PostcopyBlocktimeContext *blocktime_ctx;
77 /* notify PAUSED postcopy incoming migrations to try to continue */
78 QemuSemaphore postcopy_pause_sem_dst;
79 QemuSemaphore postcopy_pause_sem_fault;
82 MigrationIncomingState *migration_incoming_get_current(void);
83 void migration_incoming_state_destroy(void);
85 * Functions to work with blocktime context
87 void fill_destination_postcopy_migration_info(MigrationInfo *info);
89 #define TYPE_MIGRATION "migration"
91 #define MIGRATION_CLASS(klass) \
92 OBJECT_CLASS_CHECK(MigrationClass, (klass), TYPE_MIGRATION)
93 #define MIGRATION_OBJ(obj) \
94 OBJECT_CHECK(MigrationState, (obj), TYPE_MIGRATION)
95 #define MIGRATION_GET_CLASS(obj) \
96 OBJECT_GET_CLASS(MigrationClass, (obj), TYPE_MIGRATION)
98 typedef struct MigrationClass {
100 DeviceClass parent_class;
103 struct MigrationState
106 DeviceState parent_obj;
113 QEMUFile *to_dst_file;
115 /* bytes already send at the beggining of current interation */
116 uint64_t iteration_initial_bytes;
117 /* time at the start of current iteration */
118 int64_t iteration_start_time;
120 * The final stage happens when the remaining data is smaller than
121 * this threshold; it's calculated from the requested downtime and
124 int64_t threshold_size;
126 /* params from 'migrate-set-parameters' */
127 MigrationParameters parameters;
131 /* State related to return path */
133 QEMUFile *from_dst_file;
134 QemuThread rp_thread;
139 /* Timestamp when recent migration starts (ms) */
141 /* Total time used by latest migration (ms) */
143 /* Timestamp when VM is down (ms) to migrate the last stuff */
144 int64_t downtime_start;
146 int64_t expected_downtime;
147 bool enabled_capabilities[MIGRATION_CAPABILITY__MAX];
150 * Whether guest was running when we enter the completion stage.
151 * If migration is interrupted by any reason, we need to continue
152 * running the guest on source.
156 /* Flag set once the migration has been asked to enter postcopy */
158 /* Flag set after postcopy has sent the device state */
159 bool postcopy_after_devices;
161 /* Flag set once the migration thread is running (and needs joining) */
162 bool migration_thread_running;
164 /* Flag set once the migration thread called bdrv_inactivate_all */
167 /* Migration is paused due to pause-before-switchover */
168 QemuSemaphore pause_sem;
170 /* The semaphore is used to notify COLO thread that failover is finished */
171 QemuSemaphore colo_exit_sem;
173 /* The semaphore is used to notify COLO thread to do checkpoint */
174 QemuSemaphore colo_checkpoint_sem;
175 int64_t colo_checkpoint_time;
176 QEMUTimer *colo_delay_timer;
178 /* The first error that has occurred.
179 We used the mutex to be able to return the 1st error message */
181 /* mutex to protect errp */
182 QemuMutex error_mutex;
184 /* Do we have to clean up -b/-i from old migrate parameters */
185 /* This feature is deprecated and will be removed */
186 bool must_remove_block_options;
189 * Global switch on whether we need to store the global state
192 bool store_global_state;
194 /* Whether the VM is only allowing for migratable devices */
195 bool only_migratable;
197 /* Whether we send QEMU_VM_CONFIGURATION during migration */
198 bool send_configuration;
199 /* Whether we send section footer during migration */
200 bool send_section_footer;
202 /* Needed by postcopy-pause state */
203 QemuSemaphore postcopy_pause_sem;
204 QemuSemaphore postcopy_pause_rp_sem;
207 void migrate_set_state(int *state, int old_state, int new_state);
209 void migration_fd_process_incoming(QEMUFile *f);
210 void migration_ioc_process_incoming(QIOChannel *ioc);
211 void migration_incoming_process(void);
213 bool migration_has_all_channels(void);
215 uint64_t migrate_max_downtime(void);
217 void migrate_set_error(MigrationState *s, const Error *error);
218 void migrate_fd_error(MigrationState *s, const Error *error);
220 void migrate_fd_connect(MigrationState *s, Error *error_in);
222 void migrate_init(MigrationState *s);
223 bool migration_is_blocked(Error **errp);
224 /* True if outgoing migration has entered postcopy phase */
225 bool migration_in_postcopy(void);
226 MigrationState *migrate_get_current(void);
228 bool migrate_postcopy(void);
230 bool migrate_release_ram(void);
231 bool migrate_postcopy_ram(void);
232 bool migrate_zero_blocks(void);
233 bool migrate_dirty_bitmaps(void);
235 bool migrate_auto_converge(void);
236 bool migrate_use_multifd(void);
237 bool migrate_pause_before_switchover(void);
238 int migrate_multifd_channels(void);
239 int migrate_multifd_page_count(void);
241 int migrate_use_xbzrle(void);
242 int64_t migrate_xbzrle_cache_size(void);
243 bool migrate_colo_enabled(void);
245 bool migrate_use_block(void);
246 bool migrate_use_block_incremental(void);
247 bool migrate_use_return_path(void);
249 bool migrate_use_compression(void);
250 int migrate_compress_level(void);
251 int migrate_compress_threads(void);
252 int migrate_decompress_threads(void);
253 bool migrate_use_events(void);
254 bool migrate_postcopy_blocktime(void);
256 /* Sending on the return path - generic and then for each message type */
257 void migrate_send_rp_shut(MigrationIncomingState *mis,
259 void migrate_send_rp_pong(MigrationIncomingState *mis,
261 int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname,
262 ram_addr_t start, size_t len);
264 void dirty_bitmap_mig_before_vm_start(void);
265 void init_dirty_bitmap_incoming_migration(void);