migration/migration.h

   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
 269 bool migrate_auto_converge(void);
 270 bool migrate_use_multifd(void);
 271 bool migrate_pause_before_switchover(void);
 272 int migrate_multifd_channels(void);
 273 int migrate_multifd_page_count(void);
 274
 275 int migrate_use_xbzrle(void);
 276 int64_t migrate_xbzrle_cache_size(void);
 277 bool migrate_colo_enabled(void);
 278
 279 bool migrate_use_block(void);
 280 bool migrate_use_block_incremental(void);
 281 int migrate_max_cpu_throttle(void);
 282 bool migrate_use_return_path(void);
 283
 284 uint64_t ram_get_total_transferred_pages(void);
 285
 286 bool migrate_use_compression(void);
 287 int migrate_compress_level(void);
 288 int migrate_compress_threads(void);
 289 int migrate_compress_wait_thread(void);
 290 int migrate_decompress_threads(void);
 291 bool migrate_use_events(void);
 292 bool migrate_postcopy_blocktime(void);
 293
 294 /* Sending on the return path - generic and then for each message type */
 295 void migrate_send_rp_shut(MigrationIncomingState *mis,
 296                           uint32_t value);
 297 void migrate_send_rp_pong(MigrationIncomingState *mis,
 298                           uint32_t value);
 299 int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname,
 300                               ram_addr_t start, size_t len);
 301 void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis,
 302                                  char *block_name);
 303 void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value);
 304
 305 void dirty_bitmap_mig_before_vm_start(void);
 306 void init_dirty_bitmap_incoming_migration(void);
 307
 308 #define qemu_ram_foreach_block \
 309   #warning "Use qemu_ram_foreach_block_migratable in migration code"
 310
 311 void migration_make_urgent_request(void);
 312 void migration_consume_urgent_request(void);
 313
 314 #endif