migration/options.c

   1 /*
   2  * QEMU migration capabilities
   3  *
   4  * Copyright (c) 2012-2023 Red Hat Inc
   5  *
   6  * Authors:
   7  *   Orit Wasserman <owasserm@redhat.com>
   8  *   Juan Quintela <quintela@redhat.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  */
  13
  14 #include "qemu/osdep.h"
  15 #include "exec/target_page.h"
  16 #include "qapi/clone-visitor.h"
  17 #include "qapi/error.h"
  18 #include "qapi/qapi-commands-migration.h"
  19 #include "qapi/qapi-visit-migration.h"
  20 #include "qapi/qmp/qerror.h"
  21 #include "qapi/qmp/qnull.h"
  22 #include "sysemu/runstate.h"
  23 #include "migration/colo.h"
  24 #include "migration/misc.h"
  25 #include "migration.h"
  26 #include "qemu-file.h"
  27 #include "ram.h"
  28 #include "options.h"
  29
  30 /* Maximum migrate downtime set to 2000 seconds */
  31 #define MAX_MIGRATE_DOWNTIME_SECONDS 2000
  32 #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
  33
  34 #define MAX_THROTTLE  (128 << 20)      /* Migration transfer speed throttling */
  35
  36 /* Time in milliseconds we are allowed to stop the source,
  37  * for sending the last part */
  38 #define DEFAULT_MIGRATE_SET_DOWNTIME 300
  39
  40 /* Default compression thread count */
  41 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
  42 /* Default decompression thread count, usually decompression is at
  43  * least 4 times as fast as compression.*/
  44 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
  45 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */
  46 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
  47 /* Define default autoconverge cpu throttle migration parameters */
  48 #define DEFAULT_MIGRATE_THROTTLE_TRIGGER_THRESHOLD 50
  49 #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
  50 #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
  51 #define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99
  52
  53 /* Migration XBZRLE default cache size */
  54 #define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
  55
  56 /* The delay time (in ms) between two COLO checkpoints */
  57 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100)
  58 #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
  59 #define DEFAULT_MIGRATE_MULTIFD_COMPRESSION MULTIFD_COMPRESSION_NONE
  60 /* 0: means nocompress, 1: best speed, ... 9: best compress ratio */
  61 #define DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL 1
  62 /* 0: means nocompress, 1: best speed, ... 20: best compress ratio */
  63 #define DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL 1
  64
  65 /* Background transfer rate for postcopy, 0 means unlimited, note
  66  * that page requests can still exceed this limit.
  67  */
  68 #define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0
  69
  70 /*
  71  * Parameters for self_announce_delay giving a stream of RARP/ARP
  72  * packets after migration.
  73  */
  74 #define DEFAULT_MIGRATE_ANNOUNCE_INITIAL  50
  75 #define DEFAULT_MIGRATE_ANNOUNCE_MAX     550
  76 #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS    5
  77 #define DEFAULT_MIGRATE_ANNOUNCE_STEP    100
  78
  79 #define DEFINE_PROP_MIG_CAP(name, x)             \
  80     DEFINE_PROP_BOOL(name, MigrationState, capabilities[x], false)
  81
  82 Property migration_properties[] = {
  83     DEFINE_PROP_BOOL("store-global-state", MigrationState,
  84                      store_global_state, true),
  85     DEFINE_PROP_BOOL("send-configuration", MigrationState,
  86                      send_configuration, true),
  87     DEFINE_PROP_BOOL("send-section-footer", MigrationState,
  88                      send_section_footer, true),
  89     DEFINE_PROP_BOOL("decompress-error-check", MigrationState,
  90                       decompress_error_check, true),
  91     DEFINE_PROP_BOOL("multifd-flush-after-each-section", MigrationState,
  92                       multifd_flush_after_each_section, true),
  93     DEFINE_PROP_UINT8("x-clear-bitmap-shift", MigrationState,
  94                       clear_bitmap_shift, CLEAR_BITMAP_SHIFT_DEFAULT),
  95     DEFINE_PROP_BOOL("x-preempt-pre-7-2", MigrationState,
  96                      preempt_pre_7_2, false),
  97
  98     /* Migration parameters */
  99     DEFINE_PROP_UINT8("x-compress-level", MigrationState,
 100                       parameters.compress_level,
 101                       DEFAULT_MIGRATE_COMPRESS_LEVEL),
 102     DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
 103                       parameters.compress_threads,
 104                       DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
 105     DEFINE_PROP_BOOL("x-compress-wait-thread", MigrationState,
 106                       parameters.compress_wait_thread, true),
 107     DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
 108                       parameters.decompress_threads,
 109                       DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
 110     DEFINE_PROP_UINT8("x-throttle-trigger-threshold", MigrationState,
 111                       parameters.throttle_trigger_threshold,
 112                       DEFAULT_MIGRATE_THROTTLE_TRIGGER_THRESHOLD),
 113     DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
 114                       parameters.cpu_throttle_initial,
 115                       DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
 116     DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
 117                       parameters.cpu_throttle_increment,
 118                       DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
 119     DEFINE_PROP_BOOL("x-cpu-throttle-tailslow", MigrationState,
 120                       parameters.cpu_throttle_tailslow, false),
 121     DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
 122                       parameters.max_bandwidth, MAX_THROTTLE),
 123     DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
 124                       parameters.downtime_limit,
 125                       DEFAULT_MIGRATE_SET_DOWNTIME),
 126     DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
 127                       parameters.x_checkpoint_delay,
 128                       DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
 129     DEFINE_PROP_UINT8("multifd-channels", MigrationState,
 130                       parameters.multifd_channels,
 131                       DEFAULT_MIGRATE_MULTIFD_CHANNELS),
 132     DEFINE_PROP_MULTIFD_COMPRESSION("multifd-compression", MigrationState,
 133                       parameters.multifd_compression,
 134                       DEFAULT_MIGRATE_MULTIFD_COMPRESSION),
 135     DEFINE_PROP_UINT8("multifd-zlib-level", MigrationState,
 136                       parameters.multifd_zlib_level,
 137                       DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL),
 138     DEFINE_PROP_UINT8("multifd-zstd-level", MigrationState,
 139                       parameters.multifd_zstd_level,
 140                       DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL),
 141     DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
 142                       parameters.xbzrle_cache_size,
 143                       DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
 144     DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState,
 145                       parameters.max_postcopy_bandwidth,
 146                       DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH),
 147     DEFINE_PROP_UINT8("max-cpu-throttle", MigrationState,
 148                       parameters.max_cpu_throttle,
 149                       DEFAULT_MIGRATE_MAX_CPU_THROTTLE),
 150     DEFINE_PROP_SIZE("announce-initial", MigrationState,
 151                       parameters.announce_initial,
 152                       DEFAULT_MIGRATE_ANNOUNCE_INITIAL),
 153     DEFINE_PROP_SIZE("announce-max", MigrationState,
 154                       parameters.announce_max,
 155                       DEFAULT_MIGRATE_ANNOUNCE_MAX),
 156     DEFINE_PROP_SIZE("announce-rounds", MigrationState,
 157                       parameters.announce_rounds,
 158                       DEFAULT_MIGRATE_ANNOUNCE_ROUNDS),
 159     DEFINE_PROP_SIZE("announce-step", MigrationState,
 160                       parameters.announce_step,
 161                       DEFAULT_MIGRATE_ANNOUNCE_STEP),
 162     DEFINE_PROP_STRING("tls-creds", MigrationState, parameters.tls_creds),
 163     DEFINE_PROP_STRING("tls-hostname", MigrationState, parameters.tls_hostname),
 164     DEFINE_PROP_STRING("tls-authz", MigrationState, parameters.tls_authz),
 165
 166     /* Migration capabilities */
 167     DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
 168     DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
 169     DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
 170     DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
 171     DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
 172     DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
 173     DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
 174     DEFINE_PROP_MIG_CAP("x-postcopy-preempt",
 175                         MIGRATION_CAPABILITY_POSTCOPY_PREEMPT),
 176     DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
 177     DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
 178     DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
 179     DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
 180     DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD),
 181     DEFINE_PROP_MIG_CAP("x-background-snapshot",
 182             MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT),
 183 #ifdef CONFIG_LINUX
 184     DEFINE_PROP_MIG_CAP("x-zero-copy-send",
 185             MIGRATION_CAPABILITY_ZERO_COPY_SEND),
 186 #endif
 187
 188     DEFINE_PROP_END_OF_LIST(),
 189 };
 190
 191 bool migrate_auto_converge(void)
 192 {
 193     MigrationState *s = migrate_get_current();
 194
 195     return s->capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
 196 }
 197
 198 bool migrate_background_snapshot(void)
 199 {
 200     MigrationState *s = migrate_get_current();
 201
 202     return s->capabilities[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT];
 203 }
 204
 205 bool migrate_block(void)
 206 {
 207     MigrationState *s = migrate_get_current();
 208
 209     return s->capabilities[MIGRATION_CAPABILITY_BLOCK];
 210 }
 211
 212 bool migrate_colo(void)
 213 {
 214     MigrationState *s = migrate_get_current();
 215
 216     return s->capabilities[MIGRATION_CAPABILITY_X_COLO];
 217 }
 218
 219 bool migrate_compress(void)
 220 {
 221     MigrationState *s = migrate_get_current();
 222
 223     return s->capabilities[MIGRATION_CAPABILITY_COMPRESS];
 224 }
 225
 226 bool migrate_dirty_bitmaps(void)
 227 {
 228     MigrationState *s = migrate_get_current();
 229
 230     return s->capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
 231 }
 232
 233 bool migrate_events(void)
 234 {
 235     MigrationState *s = migrate_get_current();
 236
 237     return s->capabilities[MIGRATION_CAPABILITY_EVENTS];
 238 }
 239
 240 bool migrate_ignore_shared(void)
 241 {
 242     MigrationState *s = migrate_get_current();
 243
 244     return s->capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED];
 245 }
 246
 247 bool migrate_late_block_activate(void)
 248 {
 249     MigrationState *s = migrate_get_current();
 250
 251     return s->capabilities[MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE];
 252 }
 253
 254 bool migrate_multifd(void)
 255 {
 256     MigrationState *s = migrate_get_current();
 257
 258     return s->capabilities[MIGRATION_CAPABILITY_MULTIFD];
 259 }
 260
 261 bool migrate_pause_before_switchover(void)
 262 {
 263     MigrationState *s = migrate_get_current();
 264
 265     return s->capabilities[MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
 266 }
 267
 268 bool migrate_postcopy_blocktime(void)
 269 {
 270     MigrationState *s = migrate_get_current();
 271
 272     return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME];
 273 }
 274
 275 bool migrate_postcopy_preempt(void)
 276 {
 277     MigrationState *s = migrate_get_current();
 278
 279     return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT];
 280 }
 281
 282 bool migrate_postcopy_ram(void)
 283 {
 284     MigrationState *s = migrate_get_current();
 285
 286     return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
 287 }
 288
 289 bool migrate_rdma_pin_all(void)
 290 {
 291     MigrationState *s = migrate_get_current();
 292
 293     return s->capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL];
 294 }
 295
 296 bool migrate_release_ram(void)
 297 {
 298     MigrationState *s = migrate_get_current();
 299
 300     return s->capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
 301 }
 302
 303 bool migrate_return_path(void)
 304 {
 305     MigrationState *s = migrate_get_current();
 306
 307     return s->capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
 308 }
 309
 310 bool migrate_validate_uuid(void)
 311 {
 312     MigrationState *s = migrate_get_current();
 313
 314     return s->capabilities[MIGRATION_CAPABILITY_VALIDATE_UUID];
 315 }
 316
 317 bool migrate_xbzrle(void)
 318 {
 319     MigrationState *s = migrate_get_current();
 320
 321     return s->capabilities[MIGRATION_CAPABILITY_XBZRLE];
 322 }
 323
 324 bool migrate_zero_blocks(void)
 325 {
 326     MigrationState *s = migrate_get_current();
 327
 328     return s->capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
 329 }
 330
 331 bool migrate_zero_copy_send(void)
 332 {
 333     MigrationState *s = migrate_get_current();
 334
 335     return s->capabilities[MIGRATION_CAPABILITY_ZERO_COPY_SEND];
 336 }
 337
 338 /* pseudo capabilities */
 339
 340 bool migrate_multifd_flush_after_each_section(void)
 341 {
 342     MigrationState *s = migrate_get_current();
 343
 344     /*
 345      * Until the patch that remove this comment, we always return that
 346      * the property is enabled.
 347      */
 348     return true || s->multifd_flush_after_each_section;
 349 }
 350
 351 bool migrate_postcopy(void)
 352 {
 353     return migrate_postcopy_ram() || migrate_dirty_bitmaps();
 354 }
 355
 356 bool migrate_tls(void)
 357 {
 358     MigrationState *s = migrate_get_current();
 359
 360     return s->parameters.tls_creds && *s->parameters.tls_creds;
 361 }
 362
 363 typedef enum WriteTrackingSupport {
 364     WT_SUPPORT_UNKNOWN = 0,
 365     WT_SUPPORT_ABSENT,
 366     WT_SUPPORT_AVAILABLE,
 367     WT_SUPPORT_COMPATIBLE
 368 } WriteTrackingSupport;
 369
 370 static
 371 WriteTrackingSupport migrate_query_write_tracking(void)
 372 {
 373     /* Check if kernel supports required UFFD features */
 374     if (!ram_write_tracking_available()) {
 375         return WT_SUPPORT_ABSENT;
 376     }
 377     /*
 378      * Check if current memory configuration is
 379      * compatible with required UFFD features.
 380      */
 381     if (!ram_write_tracking_compatible()) {
 382         return WT_SUPPORT_AVAILABLE;
 383     }
 384
 385     return WT_SUPPORT_COMPATIBLE;
 386 }
 387
 388 /* Migration capabilities set */
 389 struct MigrateCapsSet {
 390     int size;                       /* Capability set size */
 391     MigrationCapability caps[];     /* Variadic array of capabilities */
 392 };
 393 typedef struct MigrateCapsSet MigrateCapsSet;
 394
 395 /* Define and initialize MigrateCapsSet */
 396 #define INITIALIZE_MIGRATE_CAPS_SET(_name, ...)   \
 397     MigrateCapsSet _name = {    \
 398         .size = sizeof((int []) { __VA_ARGS__ }) / sizeof(int), \
 399         .caps = { __VA_ARGS__ } \
 400     }
 401
 402 /* Background-snapshot compatibility check list */
 403 static const
 404 INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snapshot,
 405     MIGRATION_CAPABILITY_POSTCOPY_RAM,
 406     MIGRATION_CAPABILITY_DIRTY_BITMAPS,
 407     MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME,
 408     MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE,
 409     MIGRATION_CAPABILITY_RETURN_PATH,
 410     MIGRATION_CAPABILITY_MULTIFD,
 411     MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER,
 412     MIGRATION_CAPABILITY_AUTO_CONVERGE,
 413     MIGRATION_CAPABILITY_RELEASE_RAM,
 414     MIGRATION_CAPABILITY_RDMA_PIN_ALL,
 415     MIGRATION_CAPABILITY_COMPRESS,
 416     MIGRATION_CAPABILITY_XBZRLE,
 417     MIGRATION_CAPABILITY_X_COLO,
 418     MIGRATION_CAPABILITY_VALIDATE_UUID,
 419     MIGRATION_CAPABILITY_ZERO_COPY_SEND);
 420
 421 /**
 422  * @migration_caps_check - check capability compatibility
 423  *
 424  * @old_caps: old capability list
 425  * @new_caps: new capability list
 426  * @errp: set *errp if the check failed, with reason
 427  *
 428  * Returns true if check passed, otherwise false.
 429  */
 430 bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
 431 {
 432     MigrationIncomingState *mis = migration_incoming_get_current();
 433
 434     ERRP_GUARD();
 435 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
 436     if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
 437         error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
 438                    "block migration");
 439         error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
 440         return false;
 441     }
 442 #endif
 443
 444 #ifndef CONFIG_REPLICATION
 445     if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
 446         error_setg(errp, "QEMU compiled without replication module"
 447                    " can't enable COLO");
 448         error_append_hint(errp, "Please enable replication before COLO.\n");
 449         return false;
 450     }
 451 #endif
 452
 453     if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
 454         /* This check is reasonably expensive, so only when it's being
 455          * set the first time, also it's only the destination that needs
 456          * special support.
 457          */
 458         if (!old_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM] &&
 459             runstate_check(RUN_STATE_INMIGRATE) &&
 460             !postcopy_ram_supported_by_host(mis, errp)) {
 461             error_prepend(errp, "Postcopy is not supported: ");
 462             return false;
 463         }
 464
 465         if (new_caps[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
 466             error_setg(errp, "Postcopy is not compatible with ignore-shared");
 467             return false;
 468         }
 469
 470         if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
 471             error_setg(errp, "Postcopy is not yet compatible with multifd");
 472             return false;
 473         }
 474     }
 475
 476     if (new_caps[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) {
 477         WriteTrackingSupport wt_support;
 478         int idx;
 479         /*
 480          * Check if 'background-snapshot' capability is supported by
 481          * host kernel and compatible with guest memory configuration.
 482          */
 483         wt_support = migrate_query_write_tracking();
 484         if (wt_support < WT_SUPPORT_AVAILABLE) {
 485             error_setg(errp, "Background-snapshot is not supported by host kernel");
 486             return false;
 487         }
 488         if (wt_support < WT_SUPPORT_COMPATIBLE) {
 489             error_setg(errp, "Background-snapshot is not compatible "
 490                     "with guest memory configuration");
 491             return false;
 492         }
 493
 494         /*
 495          * Check if there are any migration capabilities
 496          * incompatible with 'background-snapshot'.
 497          */
 498         for (idx = 0; idx < check_caps_background_snapshot.size; idx++) {
 499             int incomp_cap = check_caps_background_snapshot.caps[idx];
 500             if (new_caps[incomp_cap]) {
 501                 error_setg(errp,
 502                         "Background-snapshot is not compatible with %s",
 503                         MigrationCapability_str(incomp_cap));
 504                 return false;
 505             }
 506         }
 507     }
 508
 509 #ifdef CONFIG_LINUX
 510     if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND] &&
 511         (!new_caps[MIGRATION_CAPABILITY_MULTIFD] ||
 512          new_caps[MIGRATION_CAPABILITY_COMPRESS] ||
 513          new_caps[MIGRATION_CAPABILITY_XBZRLE] ||
 514          migrate_multifd_compression() ||
 515          migrate_tls())) {
 516         error_setg(errp,
 517                    "Zero copy only available for non-compressed non-TLS multifd migration");
 518         return false;
 519     }
 520 #else
 521     if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND]) {
 522         error_setg(errp,
 523                    "Zero copy currently only available on Linux");
 524         return false;
 525     }
 526 #endif
 527
 528     if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]) {
 529         if (!new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
 530             error_setg(errp, "Postcopy preempt requires postcopy-ram");
 531             return false;
 532         }
 533
 534         /*
 535          * Preempt mode requires urgent pages to be sent in separate
 536          * channel, OTOH compression logic will disorder all pages into
 537          * different compression channels, which is not compatible with the
 538          * preempt assumptions on channel assignments.
 539          */
 540         if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
 541             error_setg(errp, "Postcopy preempt not compatible with compress");
 542             return false;
 543         }
 544     }
 545
 546     if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
 547         if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
 548             error_setg(errp, "Multifd is not compatible with compress");
 549             return false;
 550         }
 551     }
 552
 553     return true;
 554 }
 555
 556 bool migrate_cap_set(int cap, bool value, Error **errp)
 557 {
 558     MigrationState *s = migrate_get_current();
 559     bool new_caps[MIGRATION_CAPABILITY__MAX];
 560
 561     if (migration_is_running(s->state)) {
 562         error_setg(errp, QERR_MIGRATION_ACTIVE);
 563         return false;
 564     }
 565
 566     memcpy(new_caps, s->capabilities, sizeof(new_caps));
 567     new_caps[cap] = value;
 568
 569     if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
 570         return false;
 571     }
 572     s->capabilities[cap] = value;
 573     return true;
 574 }
 575
 576 MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
 577 {
 578     MigrationCapabilityStatusList *head = NULL, **tail = &head;
 579     MigrationCapabilityStatus *caps;
 580     MigrationState *s = migrate_get_current();
 581     int i;
 582
 583     for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
 584 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
 585         if (i == MIGRATION_CAPABILITY_BLOCK) {
 586             continue;
 587         }
 588 #endif
 589         caps = g_malloc0(sizeof(*caps));
 590         caps->capability = i;
 591         caps->state = s->capabilities[i];
 592         QAPI_LIST_APPEND(tail, caps);
 593     }
 594
 595     return head;
 596 }
 597
 598 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
 599                                   Error **errp)
 600 {
 601     MigrationState *s = migrate_get_current();
 602     MigrationCapabilityStatusList *cap;
 603     bool new_caps[MIGRATION_CAPABILITY__MAX];
 604
 605     if (migration_is_running(s->state)) {
 606         error_setg(errp, QERR_MIGRATION_ACTIVE);
 607         return;
 608     }
 609
 610     memcpy(new_caps, s->capabilities, sizeof(new_caps));
 611     for (cap = params; cap; cap = cap->next) {
 612         new_caps[cap->value->capability] = cap->value->state;
 613     }
 614
 615     if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
 616         return;
 617     }
 618
 619     for (cap = params; cap; cap = cap->next) {
 620         s->capabilities[cap->value->capability] = cap->value->state;
 621     }
 622 }
 623
 624 /* parameters */
 625
 626 const BitmapMigrationNodeAliasList *migrate_block_bitmap_mapping(void)
 627 {
 628     MigrationState *s = migrate_get_current();
 629
 630     return s->parameters.block_bitmap_mapping;
 631 }
 632
 633 bool migrate_block_incremental(void)
 634 {
 635     MigrationState *s = migrate_get_current();
 636
 637     return s->parameters.block_incremental;
 638 }
 639
 640 uint32_t migrate_checkpoint_delay(void)
 641 {
 642     MigrationState *s = migrate_get_current();
 643
 644     return s->parameters.x_checkpoint_delay;
 645 }
 646
 647 int migrate_compress_level(void)
 648 {
 649     MigrationState *s = migrate_get_current();
 650
 651     return s->parameters.compress_level;
 652 }
 653
 654 int migrate_compress_threads(void)
 655 {
 656     MigrationState *s = migrate_get_current();
 657
 658     return s->parameters.compress_threads;
 659 }
 660
 661 int migrate_compress_wait_thread(void)
 662 {
 663     MigrationState *s = migrate_get_current();
 664
 665     return s->parameters.compress_wait_thread;
 666 }
 667
 668 uint8_t migrate_cpu_throttle_increment(void)
 669 {
 670     MigrationState *s = migrate_get_current();
 671
 672     return s->parameters.cpu_throttle_increment;
 673 }
 674
 675 uint8_t migrate_cpu_throttle_initial(void)
 676 {
 677     MigrationState *s = migrate_get_current();
 678
 679     return s->parameters.cpu_throttle_initial;
 680 }
 681
 682 bool migrate_cpu_throttle_tailslow(void)
 683 {
 684     MigrationState *s = migrate_get_current();
 685
 686     return s->parameters.cpu_throttle_tailslow;
 687 }
 688
 689 int migrate_decompress_threads(void)
 690 {
 691     MigrationState *s = migrate_get_current();
 692
 693     return s->parameters.decompress_threads;
 694 }
 695
 696 uint64_t migrate_downtime_limit(void)
 697 {
 698     MigrationState *s = migrate_get_current();
 699
 700     return s->parameters.downtime_limit;
 701 }
 702
 703 uint8_t migrate_max_cpu_throttle(void)
 704 {
 705     MigrationState *s = migrate_get_current();
 706
 707     return s->parameters.max_cpu_throttle;
 708 }
 709
 710 uint64_t migrate_max_bandwidth(void)
 711 {
 712     MigrationState *s = migrate_get_current();
 713
 714     return s->parameters.max_bandwidth;
 715 }
 716
 717 int64_t migrate_max_postcopy_bandwidth(void)
 718 {
 719     MigrationState *s = migrate_get_current();
 720
 721     return s->parameters.max_postcopy_bandwidth;
 722 }
 723
 724 int migrate_multifd_channels(void)
 725 {
 726     MigrationState *s = migrate_get_current();
 727
 728     return s->parameters.multifd_channels;
 729 }
 730
 731 MultiFDCompression migrate_multifd_compression(void)
 732 {
 733     MigrationState *s = migrate_get_current();
 734
 735     assert(s->parameters.multifd_compression < MULTIFD_COMPRESSION__MAX);
 736     return s->parameters.multifd_compression;
 737 }
 738
 739 int migrate_multifd_zlib_level(void)
 740 {
 741     MigrationState *s = migrate_get_current();
 742
 743     return s->parameters.multifd_zlib_level;
 744 }
 745
 746 int migrate_multifd_zstd_level(void)
 747 {
 748     MigrationState *s = migrate_get_current();
 749
 750     return s->parameters.multifd_zstd_level;
 751 }
 752
 753 uint8_t migrate_throttle_trigger_threshold(void)
 754 {
 755     MigrationState *s = migrate_get_current();
 756
 757     return s->parameters.throttle_trigger_threshold;
 758 }
 759
 760 const char *migrate_tls_authz(void)
 761 {
 762     MigrationState *s = migrate_get_current();
 763
 764     return s->parameters.tls_authz;
 765 }
 766
 767 const char *migrate_tls_creds(void)
 768 {
 769     MigrationState *s = migrate_get_current();
 770
 771     return s->parameters.tls_creds;
 772 }
 773
 774 const char *migrate_tls_hostname(void)
 775 {
 776     MigrationState *s = migrate_get_current();
 777
 778     return s->parameters.tls_hostname;
 779 }
 780
 781 uint64_t migrate_xbzrle_cache_size(void)
 782 {
 783     MigrationState *s = migrate_get_current();
 784
 785     return s->parameters.xbzrle_cache_size;
 786 }
 787
 788 /* parameter setters */
 789
 790 void migrate_set_block_incremental(bool value)
 791 {
 792     MigrationState *s = migrate_get_current();
 793
 794     s->parameters.block_incremental = value;
 795 }
 796
 797 /* parameters helpers */
 798
 799 void block_cleanup_parameters(void)
 800 {
 801     MigrationState *s = migrate_get_current();
 802
 803     if (s->must_remove_block_options) {
 804         /* setting to false can never fail */
 805         migrate_cap_set(MIGRATION_CAPABILITY_BLOCK, false, &error_abort);
 806         migrate_set_block_incremental(false);
 807         s->must_remove_block_options = false;
 808     }
 809 }
 810
 811 AnnounceParameters *migrate_announce_params(void)
 812 {
 813     static AnnounceParameters ap;
 814
 815     MigrationState *s = migrate_get_current();
 816
 817     ap.initial = s->parameters.announce_initial;
 818     ap.max = s->parameters.announce_max;
 819     ap.rounds = s->parameters.announce_rounds;
 820     ap.step = s->parameters.announce_step;
 821
 822     return &ap;
 823 }
 824
 825 MigrationParameters *qmp_query_migrate_parameters(Error **errp)
 826 {
 827     MigrationParameters *params;
 828     MigrationState *s = migrate_get_current();
 829
 830     /* TODO use QAPI_CLONE() instead of duplicating it inline */
 831     params = g_malloc0(sizeof(*params));
 832     params->has_compress_level = true;
 833     params->compress_level = s->parameters.compress_level;
 834     params->has_compress_threads = true;
 835     params->compress_threads = s->parameters.compress_threads;
 836     params->has_compress_wait_thread = true;
 837     params->compress_wait_thread = s->parameters.compress_wait_thread;
 838     params->has_decompress_threads = true;
 839     params->decompress_threads = s->parameters.decompress_threads;
 840     params->has_throttle_trigger_threshold = true;
 841     params->throttle_trigger_threshold = s->parameters.throttle_trigger_threshold;
 842     params->has_cpu_throttle_initial = true;
 843     params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
 844     params->has_cpu_throttle_increment = true;
 845     params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
 846     params->has_cpu_throttle_tailslow = true;
 847     params->cpu_throttle_tailslow = s->parameters.cpu_throttle_tailslow;
 848     params->tls_creds = g_strdup(s->parameters.tls_creds);
 849     params->tls_hostname = g_strdup(s->parameters.tls_hostname);
 850     params->tls_authz = g_strdup(s->parameters.tls_authz ?
 851                                  s->parameters.tls_authz : "");
 852     params->has_max_bandwidth = true;
 853     params->max_bandwidth = s->parameters.max_bandwidth;
 854     params->has_downtime_limit = true;
 855     params->downtime_limit = s->parameters.downtime_limit;
 856     params->has_x_checkpoint_delay = true;
 857     params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
 858     params->has_block_incremental = true;
 859     params->block_incremental = s->parameters.block_incremental;
 860     params->has_multifd_channels = true;
 861     params->multifd_channels = s->parameters.multifd_channels;
 862     params->has_multifd_compression = true;
 863     params->multifd_compression = s->parameters.multifd_compression;
 864     params->has_multifd_zlib_level = true;
 865     params->multifd_zlib_level = s->parameters.multifd_zlib_level;
 866     params->has_multifd_zstd_level = true;
 867     params->multifd_zstd_level = s->parameters.multifd_zstd_level;
 868     params->has_xbzrle_cache_size = true;
 869     params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
 870     params->has_max_postcopy_bandwidth = true;
 871     params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth;
 872     params->has_max_cpu_throttle = true;
 873     params->max_cpu_throttle = s->parameters.max_cpu_throttle;
 874     params->has_announce_initial = true;
 875     params->announce_initial = s->parameters.announce_initial;
 876     params->has_announce_max = true;
 877     params->announce_max = s->parameters.announce_max;
 878     params->has_announce_rounds = true;
 879     params->announce_rounds = s->parameters.announce_rounds;
 880     params->has_announce_step = true;
 881     params->announce_step = s->parameters.announce_step;
 882
 883     if (s->parameters.has_block_bitmap_mapping) {
 884         params->has_block_bitmap_mapping = true;
 885         params->block_bitmap_mapping =
 886             QAPI_CLONE(BitmapMigrationNodeAliasList,
 887                        s->parameters.block_bitmap_mapping);
 888     }
 889
 890     return params;
 891 }
 892
 893 void migrate_params_init(MigrationParameters *params)
 894 {
 895     params->tls_hostname = g_strdup("");
 896     params->tls_creds = g_strdup("");
 897
 898     /* Set has_* up only for parameter checks */
 899     params->has_compress_level = true;
 900     params->has_compress_threads = true;
 901     params->has_compress_wait_thread = true;
 902     params->has_decompress_threads = true;
 903     params->has_throttle_trigger_threshold = true;
 904     params->has_cpu_throttle_initial = true;
 905     params->has_cpu_throttle_increment = true;
 906     params->has_cpu_throttle_tailslow = true;
 907     params->has_max_bandwidth = true;
 908     params->has_downtime_limit = true;
 909     params->has_x_checkpoint_delay = true;
 910     params->has_block_incremental = true;
 911     params->has_multifd_channels = true;
 912     params->has_multifd_compression = true;
 913     params->has_multifd_zlib_level = true;
 914     params->has_multifd_zstd_level = true;
 915     params->has_xbzrle_cache_size = true;
 916     params->has_max_postcopy_bandwidth = true;
 917     params->has_max_cpu_throttle = true;
 918     params->has_announce_initial = true;
 919     params->has_announce_max = true;
 920     params->has_announce_rounds = true;
 921     params->has_announce_step = true;
 922 }
 923
 924 /*
 925  * Check whether the parameters are valid. Error will be put into errp
 926  * (if provided). Return true if valid, otherwise false.
 927  */
 928 bool migrate_params_check(MigrationParameters *params, Error **errp)
 929 {
 930     if (params->has_compress_level &&
 931         (params->compress_level > 9)) {
 932         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
 933                    "a value between 0 and 9");
 934         return false;
 935     }
 936
 937     if (params->has_compress_threads && (params->compress_threads < 1)) {
 938         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 939                    "compress_threads",
 940                    "a value between 1 and 255");
 941         return false;
 942     }
 943
 944     if (params->has_decompress_threads && (params->decompress_threads < 1)) {
 945         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 946                    "decompress_threads",
 947                    "a value between 1 and 255");
 948         return false;
 949     }
 950
 951     if (params->has_throttle_trigger_threshold &&
 952         (params->throttle_trigger_threshold < 1 ||
 953          params->throttle_trigger_threshold > 100)) {
 954         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 955                    "throttle_trigger_threshold",
 956                    "an integer in the range of 1 to 100");
 957         return false;
 958     }
 959
 960     if (params->has_cpu_throttle_initial &&
 961         (params->cpu_throttle_initial < 1 ||
 962          params->cpu_throttle_initial > 99)) {
 963         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 964                    "cpu_throttle_initial",
 965                    "an integer in the range of 1 to 99");
 966         return false;
 967     }
 968
 969     if (params->has_cpu_throttle_increment &&
 970         (params->cpu_throttle_increment < 1 ||
 971          params->cpu_throttle_increment > 99)) {
 972         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 973                    "cpu_throttle_increment",
 974                    "an integer in the range of 1 to 99");
 975         return false;
 976     }
 977
 978     if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
 979         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 980                    "max_bandwidth",
 981                    "an integer in the range of 0 to "stringify(SIZE_MAX)
 982                    " bytes/second");
 983         return false;
 984     }
 985
 986     if (params->has_downtime_limit &&
 987         (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
 988         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 989                    "downtime_limit",
 990                    "an integer in the range of 0 to "
 991                     stringify(MAX_MIGRATE_DOWNTIME)" ms");
 992         return false;
 993     }
 994
 995     /* x_checkpoint_delay is now always positive */
 996
 997     if (params->has_multifd_channels && (params->multifd_channels < 1)) {
 998         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 999                    "multifd_channels",
1000                    "a value between 1 and 255");
1001         return false;
1002     }
1003
1004     if (params->has_multifd_zlib_level &&
1005         (params->multifd_zlib_level > 9)) {
1006         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zlib_level",
1007                    "a value between 0 and 9");
1008         return false;
1009     }
1010
1011     if (params->has_multifd_zstd_level &&
1012         (params->multifd_zstd_level > 20)) {
1013         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zstd_level",
1014                    "a value between 0 and 20");
1015         return false;
1016     }
1017
1018     if (params->has_xbzrle_cache_size &&
1019         (params->xbzrle_cache_size < qemu_target_page_size() ||
1020          !is_power_of_2(params->xbzrle_cache_size))) {
1021         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1022                    "xbzrle_cache_size",
1023                    "a power of two no less than the target page size");
1024         return false;
1025     }
1026
1027     if (params->has_max_cpu_throttle &&
1028         (params->max_cpu_throttle < params->cpu_throttle_initial ||
1029          params->max_cpu_throttle > 99)) {
1030         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1031                    "max_cpu_throttle",
1032                    "an integer in the range of cpu_throttle_initial to 99");
1033         return false;
1034     }
1035
1036     if (params->has_announce_initial &&
1037         params->announce_initial > 100000) {
1038         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1039                    "announce_initial",
1040                    "a value between 0 and 100000");
1041         return false;
1042     }
1043     if (params->has_announce_max &&
1044         params->announce_max > 100000) {
1045         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1046                    "announce_max",
1047                    "a value between 0 and 100000");
1048        return false;
1049     }
1050     if (params->has_announce_rounds &&
1051         params->announce_rounds > 1000) {
1052         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1053                    "announce_rounds",
1054                    "a value between 0 and 1000");
1055        return false;
1056     }
1057     if (params->has_announce_step &&
1058         (params->announce_step < 1 ||
1059         params->announce_step > 10000)) {
1060         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1061                    "announce_step",
1062                    "a value between 0 and 10000");
1063        return false;
1064     }
1065
1066     if (params->has_block_bitmap_mapping &&
1067         !check_dirty_bitmap_mig_alias_map(params->block_bitmap_mapping, errp)) {
1068         error_prepend(errp, "Invalid mapping given for block-bitmap-mapping: ");
1069         return false;
1070     }
1071
1072 #ifdef CONFIG_LINUX
1073     if (migrate_zero_copy_send() &&
1074         ((params->has_multifd_compression && params->multifd_compression) ||
1075          (params->tls_creds && *params->tls_creds))) {
1076         error_setg(errp,
1077                    "Zero copy only available for non-compressed non-TLS multifd migration");
1078         return false;
1079     }
1080 #endif
1081
1082     return true;
1083 }
1084
1085 static void migrate_params_test_apply(MigrateSetParameters *params,
1086                                       MigrationParameters *dest)
1087 {
1088     *dest = migrate_get_current()->parameters;
1089
1090     /* TODO use QAPI_CLONE() instead of duplicating it inline */
1091
1092     if (params->has_compress_level) {
1093         dest->compress_level = params->compress_level;
1094     }
1095
1096     if (params->has_compress_threads) {
1097         dest->compress_threads = params->compress_threads;
1098     }
1099
1100     if (params->has_compress_wait_thread) {
1101         dest->compress_wait_thread = params->compress_wait_thread;
1102     }
1103
1104     if (params->has_decompress_threads) {
1105         dest->decompress_threads = params->decompress_threads;
1106     }
1107
1108     if (params->has_throttle_trigger_threshold) {
1109         dest->throttle_trigger_threshold = params->throttle_trigger_threshold;
1110     }
1111
1112     if (params->has_cpu_throttle_initial) {
1113         dest->cpu_throttle_initial = params->cpu_throttle_initial;
1114     }
1115
1116     if (params->has_cpu_throttle_increment) {
1117         dest->cpu_throttle_increment = params->cpu_throttle_increment;
1118     }
1119
1120     if (params->has_cpu_throttle_tailslow) {
1121         dest->cpu_throttle_tailslow = params->cpu_throttle_tailslow;
1122     }
1123
1124     if (params->tls_creds) {
1125         assert(params->tls_creds->type == QTYPE_QSTRING);
1126         dest->tls_creds = params->tls_creds->u.s;
1127     }
1128
1129     if (params->tls_hostname) {
1130         assert(params->tls_hostname->type == QTYPE_QSTRING);
1131         dest->tls_hostname = params->tls_hostname->u.s;
1132     }
1133
1134     if (params->has_max_bandwidth) {
1135         dest->max_bandwidth = params->max_bandwidth;
1136     }
1137
1138     if (params->has_downtime_limit) {
1139         dest->downtime_limit = params->downtime_limit;
1140     }
1141
1142     if (params->has_x_checkpoint_delay) {
1143         dest->x_checkpoint_delay = params->x_checkpoint_delay;
1144     }
1145
1146     if (params->has_block_incremental) {
1147         dest->block_incremental = params->block_incremental;
1148     }
1149     if (params->has_multifd_channels) {
1150         dest->multifd_channels = params->multifd_channels;
1151     }
1152     if (params->has_multifd_compression) {
1153         dest->multifd_compression = params->multifd_compression;
1154     }
1155     if (params->has_xbzrle_cache_size) {
1156         dest->xbzrle_cache_size = params->xbzrle_cache_size;
1157     }
1158     if (params->has_max_postcopy_bandwidth) {
1159         dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth;
1160     }
1161     if (params->has_max_cpu_throttle) {
1162         dest->max_cpu_throttle = params->max_cpu_throttle;
1163     }
1164     if (params->has_announce_initial) {
1165         dest->announce_initial = params->announce_initial;
1166     }
1167     if (params->has_announce_max) {
1168         dest->announce_max = params->announce_max;
1169     }
1170     if (params->has_announce_rounds) {
1171         dest->announce_rounds = params->announce_rounds;
1172     }
1173     if (params->has_announce_step) {
1174         dest->announce_step = params->announce_step;
1175     }
1176
1177     if (params->has_block_bitmap_mapping) {
1178         dest->has_block_bitmap_mapping = true;
1179         dest->block_bitmap_mapping = params->block_bitmap_mapping;
1180     }
1181 }
1182
1183 static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
1184 {
1185     MigrationState *s = migrate_get_current();
1186
1187     /* TODO use QAPI_CLONE() instead of duplicating it inline */
1188
1189     if (params->has_compress_level) {
1190         s->parameters.compress_level = params->compress_level;
1191     }
1192
1193     if (params->has_compress_threads) {
1194         s->parameters.compress_threads = params->compress_threads;
1195     }
1196
1197     if (params->has_compress_wait_thread) {
1198         s->parameters.compress_wait_thread = params->compress_wait_thread;
1199     }
1200
1201     if (params->has_decompress_threads) {
1202         s->parameters.decompress_threads = params->decompress_threads;
1203     }
1204
1205     if (params->has_throttle_trigger_threshold) {
1206         s->parameters.throttle_trigger_threshold = params->throttle_trigger_threshold;
1207     }
1208
1209     if (params->has_cpu_throttle_initial) {
1210         s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
1211     }
1212
1213     if (params->has_cpu_throttle_increment) {
1214         s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
1215     }
1216
1217     if (params->has_cpu_throttle_tailslow) {
1218         s->parameters.cpu_throttle_tailslow = params->cpu_throttle_tailslow;
1219     }
1220
1221     if (params->tls_creds) {
1222         g_free(s->parameters.tls_creds);
1223         assert(params->tls_creds->type == QTYPE_QSTRING);
1224         s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
1225     }
1226
1227     if (params->tls_hostname) {
1228         g_free(s->parameters.tls_hostname);
1229         assert(params->tls_hostname->type == QTYPE_QSTRING);
1230         s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
1231     }
1232
1233     if (params->tls_authz) {
1234         g_free(s->parameters.tls_authz);
1235         assert(params->tls_authz->type == QTYPE_QSTRING);
1236         s->parameters.tls_authz = g_strdup(params->tls_authz->u.s);
1237     }
1238
1239     if (params->has_max_bandwidth) {
1240         s->parameters.max_bandwidth = params->max_bandwidth;
1241         if (s->to_dst_file && !migration_in_postcopy()) {
1242             qemu_file_set_rate_limit(s->to_dst_file,
1243                                 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
1244         }
1245     }
1246
1247     if (params->has_downtime_limit) {
1248         s->parameters.downtime_limit = params->downtime_limit;
1249     }
1250
1251     if (params->has_x_checkpoint_delay) {
1252         s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
1253         if (migration_in_colo_state()) {
1254             colo_checkpoint_notify(s);
1255         }
1256     }
1257
1258     if (params->has_block_incremental) {
1259         s->parameters.block_incremental = params->block_incremental;
1260     }
1261     if (params->has_multifd_channels) {
1262         s->parameters.multifd_channels = params->multifd_channels;
1263     }
1264     if (params->has_multifd_compression) {
1265         s->parameters.multifd_compression = params->multifd_compression;
1266     }
1267     if (params->has_xbzrle_cache_size) {
1268         s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
1269         xbzrle_cache_resize(params->xbzrle_cache_size, errp);
1270     }
1271     if (params->has_max_postcopy_bandwidth) {
1272         s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth;
1273         if (s->to_dst_file && migration_in_postcopy()) {
1274             qemu_file_set_rate_limit(s->to_dst_file,
1275                     s->parameters.max_postcopy_bandwidth / XFER_LIMIT_RATIO);
1276         }
1277     }
1278     if (params->has_max_cpu_throttle) {
1279         s->parameters.max_cpu_throttle = params->max_cpu_throttle;
1280     }
1281     if (params->has_announce_initial) {
1282         s->parameters.announce_initial = params->announce_initial;
1283     }
1284     if (params->has_announce_max) {
1285         s->parameters.announce_max = params->announce_max;
1286     }
1287     if (params->has_announce_rounds) {
1288         s->parameters.announce_rounds = params->announce_rounds;
1289     }
1290     if (params->has_announce_step) {
1291         s->parameters.announce_step = params->announce_step;
1292     }
1293
1294     if (params->has_block_bitmap_mapping) {
1295         qapi_free_BitmapMigrationNodeAliasList(
1296             s->parameters.block_bitmap_mapping);
1297
1298         s->parameters.has_block_bitmap_mapping = true;
1299         s->parameters.block_bitmap_mapping =
1300             QAPI_CLONE(BitmapMigrationNodeAliasList,
1301                        params->block_bitmap_mapping);
1302     }
1303 }
1304
1305 void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
1306 {
1307     MigrationParameters tmp;
1308
1309     /* TODO Rewrite "" to null instead */
1310     if (params->tls_creds
1311         && params->tls_creds->type == QTYPE_QNULL) {
1312         qobject_unref(params->tls_creds->u.n);
1313         params->tls_creds->type = QTYPE_QSTRING;
1314         params->tls_creds->u.s = strdup("");
1315     }
1316     /* TODO Rewrite "" to null instead */
1317     if (params->tls_hostname
1318         && params->tls_hostname->type == QTYPE_QNULL) {
1319         qobject_unref(params->tls_hostname->u.n);
1320         params->tls_hostname->type = QTYPE_QSTRING;
1321         params->tls_hostname->u.s = strdup("");
1322     }
1323
1324     migrate_params_test_apply(params, &tmp);
1325
1326     if (!migrate_params_check(&tmp, errp)) {
1327         /* Invalid parameter */
1328         return;
1329     }
1330
1331     migrate_params_apply(params, errp);
1332 }