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 "migration-stats.h"
  27 #include "qemu-file.h"
  28 #include "ram.h"
  29 #include "options.h"
  30 #include "sysemu/kvm.h"
  31
  32 /* Maximum migrate downtime set to 2000 seconds */
  33 #define MAX_MIGRATE_DOWNTIME_SECONDS 2000
  34 #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
  35
  36 #define MAX_THROTTLE  (128 << 20)      /* Migration transfer speed throttling */
  37
  38 /* Time in milliseconds we are allowed to stop the source,
  39  * for sending the last part */
  40 #define DEFAULT_MIGRATE_SET_DOWNTIME 300
  41
  42 /* Default compression thread count */
  43 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
  44 /* Default decompression thread count, usually decompression is at
  45  * least 4 times as fast as compression.*/
  46 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
  47 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */
  48 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
  49 /* Define default autoconverge cpu throttle migration parameters */
  50 #define DEFAULT_MIGRATE_THROTTLE_TRIGGER_THRESHOLD 50
  51 #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
  52 #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
  53 #define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99
  54
  55 /* Migration XBZRLE default cache size */
  56 #define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
  57
  58 /* The delay time (in ms) between two COLO checkpoints */
  59 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100)
  60 #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
  61 #define DEFAULT_MIGRATE_MULTIFD_COMPRESSION MULTIFD_COMPRESSION_NONE
  62 /* 0: means nocompress, 1: best speed, ... 9: best compress ratio */
  63 #define DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL 1
  64 /* 0: means nocompress, 1: best speed, ... 20: best compress ratio */
  65 #define DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL 1
  66
  67 /* Background transfer rate for postcopy, 0 means unlimited, note
  68  * that page requests can still exceed this limit.
  69  */
  70 #define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0
  71
  72 /*
  73  * Parameters for self_announce_delay giving a stream of RARP/ARP
  74  * packets after migration.
  75  */
  76 #define DEFAULT_MIGRATE_ANNOUNCE_INITIAL  50
  77 #define DEFAULT_MIGRATE_ANNOUNCE_MAX     550
  78 #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS    5
  79 #define DEFAULT_MIGRATE_ANNOUNCE_STEP    100
  80
  81 #define DEFINE_PROP_MIG_CAP(name, x)             \
  82     DEFINE_PROP_BOOL(name, MigrationState, capabilities[x], false)
  83
  84 #define DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT_PERIOD     1000    /* milliseconds */
  85 #define DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT            1       /* MB/s */
  86
  87 Property migration_properties[] = {
  88     DEFINE_PROP_BOOL("store-global-state", MigrationState,
  89                      store_global_state, true),
  90     DEFINE_PROP_BOOL("send-configuration", MigrationState,
  91                      send_configuration, true),
  92     DEFINE_PROP_BOOL("send-section-footer", MigrationState,
  93                      send_section_footer, true),
  94     DEFINE_PROP_BOOL("decompress-error-check", MigrationState,
  95                       decompress_error_check, true),
  96     DEFINE_PROP_BOOL("multifd-flush-after-each-section", MigrationState,
  97                       multifd_flush_after_each_section, false),
  98     DEFINE_PROP_UINT8("x-clear-bitmap-shift", MigrationState,
  99                       clear_bitmap_shift, CLEAR_BITMAP_SHIFT_DEFAULT),
 100     DEFINE_PROP_BOOL("x-preempt-pre-7-2", MigrationState,
 101                      preempt_pre_7_2, false),
 102
 103     /* Migration parameters */
 104     DEFINE_PROP_UINT8("x-compress-level", MigrationState,
 105                       parameters.compress_level,
 106                       DEFAULT_MIGRATE_COMPRESS_LEVEL),
 107     DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
 108                       parameters.compress_threads,
 109                       DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
 110     DEFINE_PROP_BOOL("x-compress-wait-thread", MigrationState,
 111                       parameters.compress_wait_thread, true),
 112     DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
 113                       parameters.decompress_threads,
 114                       DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
 115     DEFINE_PROP_UINT8("x-throttle-trigger-threshold", MigrationState,
 116                       parameters.throttle_trigger_threshold,
 117                       DEFAULT_MIGRATE_THROTTLE_TRIGGER_THRESHOLD),
 118     DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
 119                       parameters.cpu_throttle_initial,
 120                       DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
 121     DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
 122                       parameters.cpu_throttle_increment,
 123                       DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
 124     DEFINE_PROP_BOOL("x-cpu-throttle-tailslow", MigrationState,
 125                       parameters.cpu_throttle_tailslow, false),
 126     DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
 127                       parameters.max_bandwidth, MAX_THROTTLE),
 128     DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
 129                       parameters.downtime_limit,
 130                       DEFAULT_MIGRATE_SET_DOWNTIME),
 131     DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
 132                       parameters.x_checkpoint_delay,
 133                       DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
 134     DEFINE_PROP_UINT8("multifd-channels", MigrationState,
 135                       parameters.multifd_channels,
 136                       DEFAULT_MIGRATE_MULTIFD_CHANNELS),
 137     DEFINE_PROP_MULTIFD_COMPRESSION("multifd-compression", MigrationState,
 138                       parameters.multifd_compression,
 139                       DEFAULT_MIGRATE_MULTIFD_COMPRESSION),
 140     DEFINE_PROP_UINT8("multifd-zlib-level", MigrationState,
 141                       parameters.multifd_zlib_level,
 142                       DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL),
 143     DEFINE_PROP_UINT8("multifd-zstd-level", MigrationState,
 144                       parameters.multifd_zstd_level,
 145                       DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL),
 146     DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
 147                       parameters.xbzrle_cache_size,
 148                       DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
 149     DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState,
 150                       parameters.max_postcopy_bandwidth,
 151                       DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH),
 152     DEFINE_PROP_UINT8("max-cpu-throttle", MigrationState,
 153                       parameters.max_cpu_throttle,
 154                       DEFAULT_MIGRATE_MAX_CPU_THROTTLE),
 155     DEFINE_PROP_SIZE("announce-initial", MigrationState,
 156                       parameters.announce_initial,
 157                       DEFAULT_MIGRATE_ANNOUNCE_INITIAL),
 158     DEFINE_PROP_SIZE("announce-max", MigrationState,
 159                       parameters.announce_max,
 160                       DEFAULT_MIGRATE_ANNOUNCE_MAX),
 161     DEFINE_PROP_SIZE("announce-rounds", MigrationState,
 162                       parameters.announce_rounds,
 163                       DEFAULT_MIGRATE_ANNOUNCE_ROUNDS),
 164     DEFINE_PROP_SIZE("announce-step", MigrationState,
 165                       parameters.announce_step,
 166                       DEFAULT_MIGRATE_ANNOUNCE_STEP),
 167     DEFINE_PROP_STRING("tls-creds", MigrationState, parameters.tls_creds),
 168     DEFINE_PROP_STRING("tls-hostname", MigrationState, parameters.tls_hostname),
 169     DEFINE_PROP_STRING("tls-authz", MigrationState, parameters.tls_authz),
 170     DEFINE_PROP_UINT64("x-vcpu-dirty-limit-period", MigrationState,
 171                        parameters.x_vcpu_dirty_limit_period,
 172                        DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT_PERIOD),
 173     DEFINE_PROP_UINT64("vcpu-dirty-limit", MigrationState,
 174                        parameters.vcpu_dirty_limit,
 175                        DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT),
 176
 177     /* Migration capabilities */
 178     DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
 179     DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
 180     DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
 181     DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
 182     DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
 183     DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
 184     DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
 185     DEFINE_PROP_MIG_CAP("x-postcopy-preempt",
 186                         MIGRATION_CAPABILITY_POSTCOPY_PREEMPT),
 187     DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
 188     DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
 189     DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
 190     DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
 191     DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD),
 192     DEFINE_PROP_MIG_CAP("x-background-snapshot",
 193             MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT),
 194 #ifdef CONFIG_LINUX
 195     DEFINE_PROP_MIG_CAP("x-zero-copy-send",
 196             MIGRATION_CAPABILITY_ZERO_COPY_SEND),
 197 #endif
 198     DEFINE_PROP_MIG_CAP("x-switchover-ack",
 199                         MIGRATION_CAPABILITY_SWITCHOVER_ACK),
 200     DEFINE_PROP_MIG_CAP("x-dirty-limit", MIGRATION_CAPABILITY_DIRTY_LIMIT),
 201     DEFINE_PROP_END_OF_LIST(),
 202 };
 203
 204 bool migrate_auto_converge(void)
 205 {
 206     MigrationState *s = migrate_get_current();
 207
 208     return s->capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
 209 }
 210
 211 bool migrate_background_snapshot(void)
 212 {
 213     MigrationState *s = migrate_get_current();
 214
 215     return s->capabilities[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT];
 216 }
 217
 218 bool migrate_block(void)
 219 {
 220     MigrationState *s = migrate_get_current();
 221
 222     return s->capabilities[MIGRATION_CAPABILITY_BLOCK];
 223 }
 224
 225 bool migrate_colo(void)
 226 {
 227     MigrationState *s = migrate_get_current();
 228
 229     return s->capabilities[MIGRATION_CAPABILITY_X_COLO];
 230 }
 231
 232 bool migrate_compress(void)
 233 {
 234     MigrationState *s = migrate_get_current();
 235
 236     return s->capabilities[MIGRATION_CAPABILITY_COMPRESS];
 237 }
 238
 239 bool migrate_dirty_bitmaps(void)
 240 {
 241     MigrationState *s = migrate_get_current();
 242
 243     return s->capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
 244 }
 245
 246 bool migrate_dirty_limit(void)
 247 {
 248     MigrationState *s = migrate_get_current();
 249
 250     return s->capabilities[MIGRATION_CAPABILITY_DIRTY_LIMIT];
 251 }
 252
 253 bool migrate_events(void)
 254 {
 255     MigrationState *s = migrate_get_current();
 256
 257     return s->capabilities[MIGRATION_CAPABILITY_EVENTS];
 258 }
 259
 260 bool migrate_ignore_shared(void)
 261 {
 262     MigrationState *s = migrate_get_current();
 263
 264     return s->capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED];
 265 }
 266
 267 bool migrate_late_block_activate(void)
 268 {
 269     MigrationState *s = migrate_get_current();
 270
 271     return s->capabilities[MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE];
 272 }
 273
 274 bool migrate_multifd(void)
 275 {
 276     MigrationState *s = migrate_get_current();
 277
 278     return s->capabilities[MIGRATION_CAPABILITY_MULTIFD];
 279 }
 280
 281 bool migrate_pause_before_switchover(void)
 282 {
 283     MigrationState *s = migrate_get_current();
 284
 285     return s->capabilities[MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
 286 }
 287
 288 bool migrate_postcopy_blocktime(void)
 289 {
 290     MigrationState *s = migrate_get_current();
 291
 292     return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME];
 293 }
 294
 295 bool migrate_postcopy_preempt(void)
 296 {
 297     MigrationState *s = migrate_get_current();
 298
 299     return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT];
 300 }
 301
 302 bool migrate_postcopy_ram(void)
 303 {
 304     MigrationState *s = migrate_get_current();
 305
 306     return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
 307 }
 308
 309 bool migrate_rdma_pin_all(void)
 310 {
 311     MigrationState *s = migrate_get_current();
 312
 313     return s->capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL];
 314 }
 315
 316 bool migrate_release_ram(void)
 317 {
 318     MigrationState *s = migrate_get_current();
 319
 320     return s->capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
 321 }
 322
 323 bool migrate_return_path(void)
 324 {
 325     MigrationState *s = migrate_get_current();
 326
 327     return s->capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
 328 }
 329
 330 bool migrate_switchover_ack(void)
 331 {
 332     MigrationState *s = migrate_get_current();
 333
 334     return s->capabilities[MIGRATION_CAPABILITY_SWITCHOVER_ACK];
 335 }
 336
 337 bool migrate_validate_uuid(void)
 338 {
 339     MigrationState *s = migrate_get_current();
 340
 341     return s->capabilities[MIGRATION_CAPABILITY_VALIDATE_UUID];
 342 }
 343
 344 bool migrate_xbzrle(void)
 345 {
 346     MigrationState *s = migrate_get_current();
 347
 348     return s->capabilities[MIGRATION_CAPABILITY_XBZRLE];
 349 }
 350
 351 bool migrate_zero_blocks(void)
 352 {
 353     MigrationState *s = migrate_get_current();
 354
 355     return s->capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
 356 }
 357
 358 bool migrate_zero_copy_send(void)
 359 {
 360     MigrationState *s = migrate_get_current();
 361
 362     return s->capabilities[MIGRATION_CAPABILITY_ZERO_COPY_SEND];
 363 }
 364
 365 /* pseudo capabilities */
 366
 367 bool migrate_multifd_flush_after_each_section(void)
 368 {
 369     MigrationState *s = migrate_get_current();
 370
 371     return s->multifd_flush_after_each_section;
 372 }
 373
 374 bool migrate_postcopy(void)
 375 {
 376     return migrate_postcopy_ram() || migrate_dirty_bitmaps();
 377 }
 378
 379 bool migrate_tls(void)
 380 {
 381     MigrationState *s = migrate_get_current();
 382
 383     return s->parameters.tls_creds && *s->parameters.tls_creds;
 384 }
 385
 386 typedef enum WriteTrackingSupport {
 387     WT_SUPPORT_UNKNOWN = 0,
 388     WT_SUPPORT_ABSENT,
 389     WT_SUPPORT_AVAILABLE,
 390     WT_SUPPORT_COMPATIBLE
 391 } WriteTrackingSupport;
 392
 393 static
 394 WriteTrackingSupport migrate_query_write_tracking(void)
 395 {
 396     /* Check if kernel supports required UFFD features */
 397     if (!ram_write_tracking_available()) {
 398         return WT_SUPPORT_ABSENT;
 399     }
 400     /*
 401      * Check if current memory configuration is
 402      * compatible with required UFFD features.
 403      */
 404     if (!ram_write_tracking_compatible()) {
 405         return WT_SUPPORT_AVAILABLE;
 406     }
 407
 408     return WT_SUPPORT_COMPATIBLE;
 409 }
 410
 411 /* Migration capabilities set */
 412 struct MigrateCapsSet {
 413     int size;                       /* Capability set size */
 414     MigrationCapability caps[];     /* Variadic array of capabilities */
 415 };
 416 typedef struct MigrateCapsSet MigrateCapsSet;
 417
 418 /* Define and initialize MigrateCapsSet */
 419 #define INITIALIZE_MIGRATE_CAPS_SET(_name, ...)   \
 420     MigrateCapsSet _name = {    \
 421         .size = sizeof((int []) { __VA_ARGS__ }) / sizeof(int), \
 422         .caps = { __VA_ARGS__ } \
 423     }
 424
 425 /* Background-snapshot compatibility check list */
 426 static const
 427 INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snapshot,
 428     MIGRATION_CAPABILITY_POSTCOPY_RAM,
 429     MIGRATION_CAPABILITY_DIRTY_BITMAPS,
 430     MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME,
 431     MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE,
 432     MIGRATION_CAPABILITY_RETURN_PATH,
 433     MIGRATION_CAPABILITY_MULTIFD,
 434     MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER,
 435     MIGRATION_CAPABILITY_AUTO_CONVERGE,
 436     MIGRATION_CAPABILITY_RELEASE_RAM,
 437     MIGRATION_CAPABILITY_RDMA_PIN_ALL,
 438     MIGRATION_CAPABILITY_COMPRESS,
 439     MIGRATION_CAPABILITY_XBZRLE,
 440     MIGRATION_CAPABILITY_X_COLO,
 441     MIGRATION_CAPABILITY_VALIDATE_UUID,
 442     MIGRATION_CAPABILITY_ZERO_COPY_SEND);
 443
 444 /**
 445  * @migration_caps_check - check capability compatibility
 446  *
 447  * @old_caps: old capability list
 448  * @new_caps: new capability list
 449  * @errp: set *errp if the check failed, with reason
 450  *
 451  * Returns true if check passed, otherwise false.
 452  */
 453 bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
 454 {
 455     MigrationIncomingState *mis = migration_incoming_get_current();
 456
 457     ERRP_GUARD();
 458 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
 459     if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
 460         error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
 461                    "block migration");
 462         error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
 463         return false;
 464     }
 465 #endif
 466
 467 #ifndef CONFIG_REPLICATION
 468     if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
 469         error_setg(errp, "QEMU compiled without replication module"
 470                    " can't enable COLO");
 471         error_append_hint(errp, "Please enable replication before COLO.\n");
 472         return false;
 473     }
 474 #endif
 475
 476     if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
 477         /* This check is reasonably expensive, so only when it's being
 478          * set the first time, also it's only the destination that needs
 479          * special support.
 480          */
 481         if (!old_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM] &&
 482             runstate_check(RUN_STATE_INMIGRATE) &&
 483             !postcopy_ram_supported_by_host(mis, errp)) {
 484             error_prepend(errp, "Postcopy is not supported: ");
 485             return false;
 486         }
 487
 488         if (new_caps[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
 489             error_setg(errp, "Postcopy is not compatible with ignore-shared");
 490             return false;
 491         }
 492
 493         if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
 494             error_setg(errp, "Postcopy is not yet compatible with multifd");
 495             return false;
 496         }
 497     }
 498
 499     if (new_caps[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) {
 500         WriteTrackingSupport wt_support;
 501         int idx;
 502         /*
 503          * Check if 'background-snapshot' capability is supported by
 504          * host kernel and compatible with guest memory configuration.
 505          */
 506         wt_support = migrate_query_write_tracking();
 507         if (wt_support < WT_SUPPORT_AVAILABLE) {
 508             error_setg(errp, "Background-snapshot is not supported by host kernel");
 509             return false;
 510         }
 511         if (wt_support < WT_SUPPORT_COMPATIBLE) {
 512             error_setg(errp, "Background-snapshot is not compatible "
 513                     "with guest memory configuration");
 514             return false;
 515         }
 516
 517         /*
 518          * Check if there are any migration capabilities
 519          * incompatible with 'background-snapshot'.
 520          */
 521         for (idx = 0; idx < check_caps_background_snapshot.size; idx++) {
 522             int incomp_cap = check_caps_background_snapshot.caps[idx];
 523             if (new_caps[incomp_cap]) {
 524                 error_setg(errp,
 525                         "Background-snapshot is not compatible with %s",
 526                         MigrationCapability_str(incomp_cap));
 527                 return false;
 528             }
 529         }
 530     }
 531
 532 #ifdef CONFIG_LINUX
 533     if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND] &&
 534         (!new_caps[MIGRATION_CAPABILITY_MULTIFD] ||
 535          new_caps[MIGRATION_CAPABILITY_COMPRESS] ||
 536          new_caps[MIGRATION_CAPABILITY_XBZRLE] ||
 537          migrate_multifd_compression() ||
 538          migrate_tls())) {
 539         error_setg(errp,
 540                    "Zero copy only available for non-compressed non-TLS multifd migration");
 541         return false;
 542     }
 543 #else
 544     if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND]) {
 545         error_setg(errp,
 546                    "Zero copy currently only available on Linux");
 547         return false;
 548     }
 549 #endif
 550
 551     if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]) {
 552         if (!new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
 553             error_setg(errp, "Postcopy preempt requires postcopy-ram");
 554             return false;
 555         }
 556
 557         /*
 558          * Preempt mode requires urgent pages to be sent in separate
 559          * channel, OTOH compression logic will disorder all pages into
 560          * different compression channels, which is not compatible with the
 561          * preempt assumptions on channel assignments.
 562          */
 563         if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
 564             error_setg(errp, "Postcopy preempt not compatible with compress");
 565             return false;
 566         }
 567     }
 568
 569     if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
 570         if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
 571             error_setg(errp, "Multifd is not compatible with compress");
 572             return false;
 573         }
 574     }
 575
 576     if (new_caps[MIGRATION_CAPABILITY_SWITCHOVER_ACK]) {
 577         if (!new_caps[MIGRATION_CAPABILITY_RETURN_PATH]) {
 578             error_setg(errp, "Capability 'switchover-ack' requires capability "
 579                              "'return-path'");
 580             return false;
 581         }
 582     }
 583     if (new_caps[MIGRATION_CAPABILITY_DIRTY_LIMIT]) {
 584         if (new_caps[MIGRATION_CAPABILITY_AUTO_CONVERGE]) {
 585             error_setg(errp, "dirty-limit conflicts with auto-converge"
 586                        " either of then available currently");
 587             return false;
 588         }
 589
 590         if (!kvm_enabled() || !kvm_dirty_ring_enabled()) {
 591             error_setg(errp, "dirty-limit requires KVM with accelerator"
 592                    " property 'dirty-ring-size' set");
 593             return false;
 594         }
 595     }
 596
 597     return true;
 598 }
 599
 600 bool migrate_cap_set(int cap, bool value, Error **errp)
 601 {
 602     MigrationState *s = migrate_get_current();
 603     bool new_caps[MIGRATION_CAPABILITY__MAX];
 604
 605     if (migration_is_running(s->state)) {
 606         error_setg(errp, QERR_MIGRATION_ACTIVE);
 607         return false;
 608     }
 609
 610     memcpy(new_caps, s->capabilities, sizeof(new_caps));
 611     new_caps[cap] = value;
 612
 613     if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
 614         return false;
 615     }
 616     s->capabilities[cap] = value;
 617     return true;
 618 }
 619
 620 MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
 621 {
 622     MigrationCapabilityStatusList *head = NULL, **tail = &head;
 623     MigrationCapabilityStatus *caps;
 624     MigrationState *s = migrate_get_current();
 625     int i;
 626
 627     for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
 628 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
 629         if (i == MIGRATION_CAPABILITY_BLOCK) {
 630             continue;
 631         }
 632 #endif
 633         caps = g_malloc0(sizeof(*caps));
 634         caps->capability = i;
 635         caps->state = s->capabilities[i];
 636         QAPI_LIST_APPEND(tail, caps);
 637     }
 638
 639     return head;
 640 }
 641
 642 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
 643                                   Error **errp)
 644 {
 645     MigrationState *s = migrate_get_current();
 646     MigrationCapabilityStatusList *cap;
 647     bool new_caps[MIGRATION_CAPABILITY__MAX];
 648
 649     if (migration_is_running(s->state) || migration_in_colo_state()) {
 650         error_setg(errp, QERR_MIGRATION_ACTIVE);
 651         return;
 652     }
 653
 654     memcpy(new_caps, s->capabilities, sizeof(new_caps));
 655     for (cap = params; cap; cap = cap->next) {
 656         new_caps[cap->value->capability] = cap->value->state;
 657     }
 658
 659     if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
 660         return;
 661     }
 662
 663     for (cap = params; cap; cap = cap->next) {
 664         s->capabilities[cap->value->capability] = cap->value->state;
 665     }
 666 }
 667
 668 /* parameters */
 669
 670 const BitmapMigrationNodeAliasList *migrate_block_bitmap_mapping(void)
 671 {
 672     MigrationState *s = migrate_get_current();
 673
 674     return s->parameters.block_bitmap_mapping;
 675 }
 676
 677 bool migrate_has_block_bitmap_mapping(void)
 678 {
 679     MigrationState *s = migrate_get_current();
 680
 681     return s->parameters.has_block_bitmap_mapping;
 682 }
 683
 684 bool migrate_block_incremental(void)
 685 {
 686     MigrationState *s = migrate_get_current();
 687
 688     return s->parameters.block_incremental;
 689 }
 690
 691 uint32_t migrate_checkpoint_delay(void)
 692 {
 693     MigrationState *s = migrate_get_current();
 694
 695     return s->parameters.x_checkpoint_delay;
 696 }
 697
 698 int migrate_compress_level(void)
 699 {
 700     MigrationState *s = migrate_get_current();
 701
 702     return s->parameters.compress_level;
 703 }
 704
 705 int migrate_compress_threads(void)
 706 {
 707     MigrationState *s = migrate_get_current();
 708
 709     return s->parameters.compress_threads;
 710 }
 711
 712 int migrate_compress_wait_thread(void)
 713 {
 714     MigrationState *s = migrate_get_current();
 715
 716     return s->parameters.compress_wait_thread;
 717 }
 718
 719 uint8_t migrate_cpu_throttle_increment(void)
 720 {
 721     MigrationState *s = migrate_get_current();
 722
 723     return s->parameters.cpu_throttle_increment;
 724 }
 725
 726 uint8_t migrate_cpu_throttle_initial(void)
 727 {
 728     MigrationState *s = migrate_get_current();
 729
 730     return s->parameters.cpu_throttle_initial;
 731 }
 732
 733 bool migrate_cpu_throttle_tailslow(void)
 734 {
 735     MigrationState *s = migrate_get_current();
 736
 737     return s->parameters.cpu_throttle_tailslow;
 738 }
 739
 740 int migrate_decompress_threads(void)
 741 {
 742     MigrationState *s = migrate_get_current();
 743
 744     return s->parameters.decompress_threads;
 745 }
 746
 747 uint64_t migrate_downtime_limit(void)
 748 {
 749     MigrationState *s = migrate_get_current();
 750
 751     return s->parameters.downtime_limit;
 752 }
 753
 754 uint8_t migrate_max_cpu_throttle(void)
 755 {
 756     MigrationState *s = migrate_get_current();
 757
 758     return s->parameters.max_cpu_throttle;
 759 }
 760
 761 uint64_t migrate_max_bandwidth(void)
 762 {
 763     MigrationState *s = migrate_get_current();
 764
 765     return s->parameters.max_bandwidth;
 766 }
 767
 768 uint64_t migrate_max_postcopy_bandwidth(void)
 769 {
 770     MigrationState *s = migrate_get_current();
 771
 772     return s->parameters.max_postcopy_bandwidth;
 773 }
 774
 775 int migrate_multifd_channels(void)
 776 {
 777     MigrationState *s = migrate_get_current();
 778
 779     return s->parameters.multifd_channels;
 780 }
 781
 782 MultiFDCompression migrate_multifd_compression(void)
 783 {
 784     MigrationState *s = migrate_get_current();
 785
 786     assert(s->parameters.multifd_compression < MULTIFD_COMPRESSION__MAX);
 787     return s->parameters.multifd_compression;
 788 }
 789
 790 int migrate_multifd_zlib_level(void)
 791 {
 792     MigrationState *s = migrate_get_current();
 793
 794     return s->parameters.multifd_zlib_level;
 795 }
 796
 797 int migrate_multifd_zstd_level(void)
 798 {
 799     MigrationState *s = migrate_get_current();
 800
 801     return s->parameters.multifd_zstd_level;
 802 }
 803
 804 uint8_t migrate_throttle_trigger_threshold(void)
 805 {
 806     MigrationState *s = migrate_get_current();
 807
 808     return s->parameters.throttle_trigger_threshold;
 809 }
 810
 811 const char *migrate_tls_authz(void)
 812 {
 813     MigrationState *s = migrate_get_current();
 814
 815     return s->parameters.tls_authz;
 816 }
 817
 818 const char *migrate_tls_creds(void)
 819 {
 820     MigrationState *s = migrate_get_current();
 821
 822     return s->parameters.tls_creds;
 823 }
 824
 825 const char *migrate_tls_hostname(void)
 826 {
 827     MigrationState *s = migrate_get_current();
 828
 829     return s->parameters.tls_hostname;
 830 }
 831
 832 uint64_t migrate_xbzrle_cache_size(void)
 833 {
 834     MigrationState *s = migrate_get_current();
 835
 836     return s->parameters.xbzrle_cache_size;
 837 }
 838
 839 /* parameter setters */
 840
 841 void migrate_set_block_incremental(bool value)
 842 {
 843     MigrationState *s = migrate_get_current();
 844
 845     s->parameters.block_incremental = value;
 846 }
 847
 848 /* parameters helpers */
 849
 850 void block_cleanup_parameters(void)
 851 {
 852     MigrationState *s = migrate_get_current();
 853
 854     if (s->must_remove_block_options) {
 855         /* setting to false can never fail */
 856         migrate_cap_set(MIGRATION_CAPABILITY_BLOCK, false, &error_abort);
 857         migrate_set_block_incremental(false);
 858         s->must_remove_block_options = false;
 859     }
 860 }
 861
 862 AnnounceParameters *migrate_announce_params(void)
 863 {
 864     static AnnounceParameters ap;
 865
 866     MigrationState *s = migrate_get_current();
 867
 868     ap.initial = s->parameters.announce_initial;
 869     ap.max = s->parameters.announce_max;
 870     ap.rounds = s->parameters.announce_rounds;
 871     ap.step = s->parameters.announce_step;
 872
 873     return &ap;
 874 }
 875
 876 MigrationParameters *qmp_query_migrate_parameters(Error **errp)
 877 {
 878     MigrationParameters *params;
 879     MigrationState *s = migrate_get_current();
 880
 881     /* TODO use QAPI_CLONE() instead of duplicating it inline */
 882     params = g_malloc0(sizeof(*params));
 883     params->has_compress_level = true;
 884     params->compress_level = s->parameters.compress_level;
 885     params->has_compress_threads = true;
 886     params->compress_threads = s->parameters.compress_threads;
 887     params->has_compress_wait_thread = true;
 888     params->compress_wait_thread = s->parameters.compress_wait_thread;
 889     params->has_decompress_threads = true;
 890     params->decompress_threads = s->parameters.decompress_threads;
 891     params->has_throttle_trigger_threshold = true;
 892     params->throttle_trigger_threshold = s->parameters.throttle_trigger_threshold;
 893     params->has_cpu_throttle_initial = true;
 894     params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
 895     params->has_cpu_throttle_increment = true;
 896     params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
 897     params->has_cpu_throttle_tailslow = true;
 898     params->cpu_throttle_tailslow = s->parameters.cpu_throttle_tailslow;
 899     params->tls_creds = g_strdup(s->parameters.tls_creds);
 900     params->tls_hostname = g_strdup(s->parameters.tls_hostname);
 901     params->tls_authz = g_strdup(s->parameters.tls_authz ?
 902                                  s->parameters.tls_authz : "");
 903     params->has_max_bandwidth = true;
 904     params->max_bandwidth = s->parameters.max_bandwidth;
 905     params->has_downtime_limit = true;
 906     params->downtime_limit = s->parameters.downtime_limit;
 907     params->has_x_checkpoint_delay = true;
 908     params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
 909     params->has_block_incremental = true;
 910     params->block_incremental = s->parameters.block_incremental;
 911     params->has_multifd_channels = true;
 912     params->multifd_channels = s->parameters.multifd_channels;
 913     params->has_multifd_compression = true;
 914     params->multifd_compression = s->parameters.multifd_compression;
 915     params->has_multifd_zlib_level = true;
 916     params->multifd_zlib_level = s->parameters.multifd_zlib_level;
 917     params->has_multifd_zstd_level = true;
 918     params->multifd_zstd_level = s->parameters.multifd_zstd_level;
 919     params->has_xbzrle_cache_size = true;
 920     params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
 921     params->has_max_postcopy_bandwidth = true;
 922     params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth;
 923     params->has_max_cpu_throttle = true;
 924     params->max_cpu_throttle = s->parameters.max_cpu_throttle;
 925     params->has_announce_initial = true;
 926     params->announce_initial = s->parameters.announce_initial;
 927     params->has_announce_max = true;
 928     params->announce_max = s->parameters.announce_max;
 929     params->has_announce_rounds = true;
 930     params->announce_rounds = s->parameters.announce_rounds;
 931     params->has_announce_step = true;
 932     params->announce_step = s->parameters.announce_step;
 933
 934     if (s->parameters.has_block_bitmap_mapping) {
 935         params->has_block_bitmap_mapping = true;
 936         params->block_bitmap_mapping =
 937             QAPI_CLONE(BitmapMigrationNodeAliasList,
 938                        s->parameters.block_bitmap_mapping);
 939     }
 940
 941     params->has_x_vcpu_dirty_limit_period = true;
 942     params->x_vcpu_dirty_limit_period = s->parameters.x_vcpu_dirty_limit_period;
 943     params->has_vcpu_dirty_limit = true;
 944     params->vcpu_dirty_limit = s->parameters.vcpu_dirty_limit;
 945
 946     return params;
 947 }
 948
 949 void migrate_params_init(MigrationParameters *params)
 950 {
 951     params->tls_hostname = g_strdup("");
 952     params->tls_creds = g_strdup("");
 953
 954     /* Set has_* up only for parameter checks */
 955     params->has_compress_level = true;
 956     params->has_compress_threads = true;
 957     params->has_compress_wait_thread = true;
 958     params->has_decompress_threads = true;
 959     params->has_throttle_trigger_threshold = true;
 960     params->has_cpu_throttle_initial = true;
 961     params->has_cpu_throttle_increment = true;
 962     params->has_cpu_throttle_tailslow = true;
 963     params->has_max_bandwidth = true;
 964     params->has_downtime_limit = true;
 965     params->has_x_checkpoint_delay = true;
 966     params->has_block_incremental = true;
 967     params->has_multifd_channels = true;
 968     params->has_multifd_compression = true;
 969     params->has_multifd_zlib_level = true;
 970     params->has_multifd_zstd_level = true;
 971     params->has_xbzrle_cache_size = true;
 972     params->has_max_postcopy_bandwidth = true;
 973     params->has_max_cpu_throttle = true;
 974     params->has_announce_initial = true;
 975     params->has_announce_max = true;
 976     params->has_announce_rounds = true;
 977     params->has_announce_step = true;
 978     params->has_x_vcpu_dirty_limit_period = true;
 979     params->has_vcpu_dirty_limit = true;
 980 }
 981
 982 /*
 983  * Check whether the parameters are valid. Error will be put into errp
 984  * (if provided). Return true if valid, otherwise false.
 985  */
 986 bool migrate_params_check(MigrationParameters *params, Error **errp)
 987 {
 988     if (params->has_compress_level &&
 989         (params->compress_level > 9)) {
 990         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
 991                    "a value between 0 and 9");
 992         return false;
 993     }
 994
 995     if (params->has_compress_threads && (params->compress_threads < 1)) {
 996         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 997                    "compress_threads",
 998                    "a value between 1 and 255");
 999         return false;
1000     }
1001
1002     if (params->has_decompress_threads && (params->decompress_threads < 1)) {
1003         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1004                    "decompress_threads",
1005                    "a value between 1 and 255");
1006         return false;
1007     }
1008
1009     if (params->has_throttle_trigger_threshold &&
1010         (params->throttle_trigger_threshold < 1 ||
1011          params->throttle_trigger_threshold > 100)) {
1012         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1013                    "throttle_trigger_threshold",
1014                    "an integer in the range of 1 to 100");
1015         return false;
1016     }
1017
1018     if (params->has_cpu_throttle_initial &&
1019         (params->cpu_throttle_initial < 1 ||
1020          params->cpu_throttle_initial > 99)) {
1021         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1022                    "cpu_throttle_initial",
1023                    "an integer in the range of 1 to 99");
1024         return false;
1025     }
1026
1027     if (params->has_cpu_throttle_increment &&
1028         (params->cpu_throttle_increment < 1 ||
1029          params->cpu_throttle_increment > 99)) {
1030         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1031                    "cpu_throttle_increment",
1032                    "an integer in the range of 1 to 99");
1033         return false;
1034     }
1035
1036     if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
1037         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1038                    "max_bandwidth",
1039                    "an integer in the range of 0 to "stringify(SIZE_MAX)
1040                    " bytes/second");
1041         return false;
1042     }
1043
1044     if (params->has_downtime_limit &&
1045         (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
1046         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1047                    "downtime_limit",
1048                    "an integer in the range of 0 to "
1049                     stringify(MAX_MIGRATE_DOWNTIME)" ms");
1050         return false;
1051     }
1052
1053     /* x_checkpoint_delay is now always positive */
1054
1055     if (params->has_multifd_channels && (params->multifd_channels < 1)) {
1056         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1057                    "multifd_channels",
1058                    "a value between 1 and 255");
1059         return false;
1060     }
1061
1062     if (params->has_multifd_zlib_level &&
1063         (params->multifd_zlib_level > 9)) {
1064         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zlib_level",
1065                    "a value between 0 and 9");
1066         return false;
1067     }
1068
1069     if (params->has_multifd_zstd_level &&
1070         (params->multifd_zstd_level > 20)) {
1071         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zstd_level",
1072                    "a value between 0 and 20");
1073         return false;
1074     }
1075
1076     if (params->has_xbzrle_cache_size &&
1077         (params->xbzrle_cache_size < qemu_target_page_size() ||
1078          !is_power_of_2(params->xbzrle_cache_size))) {
1079         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1080                    "xbzrle_cache_size",
1081                    "a power of two no less than the target page size");
1082         return false;
1083     }
1084
1085     if (params->has_max_cpu_throttle &&
1086         (params->max_cpu_throttle < params->cpu_throttle_initial ||
1087          params->max_cpu_throttle > 99)) {
1088         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1089                    "max_cpu_throttle",
1090                    "an integer in the range of cpu_throttle_initial to 99");
1091         return false;
1092     }
1093
1094     if (params->has_announce_initial &&
1095         params->announce_initial > 100000) {
1096         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1097                    "announce_initial",
1098                    "a value between 0 and 100000");
1099         return false;
1100     }
1101     if (params->has_announce_max &&
1102         params->announce_max > 100000) {
1103         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1104                    "announce_max",
1105                    "a value between 0 and 100000");
1106        return false;
1107     }
1108     if (params->has_announce_rounds &&
1109         params->announce_rounds > 1000) {
1110         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1111                    "announce_rounds",
1112                    "a value between 0 and 1000");
1113        return false;
1114     }
1115     if (params->has_announce_step &&
1116         (params->announce_step < 1 ||
1117         params->announce_step > 10000)) {
1118         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1119                    "announce_step",
1120                    "a value between 0 and 10000");
1121        return false;
1122     }
1123
1124     if (params->has_block_bitmap_mapping &&
1125         !check_dirty_bitmap_mig_alias_map(params->block_bitmap_mapping, errp)) {
1126         error_prepend(errp, "Invalid mapping given for block-bitmap-mapping: ");
1127         return false;
1128     }
1129
1130 #ifdef CONFIG_LINUX
1131     if (migrate_zero_copy_send() &&
1132         ((params->has_multifd_compression && params->multifd_compression) ||
1133          (params->tls_creds && *params->tls_creds))) {
1134         error_setg(errp,
1135                    "Zero copy only available for non-compressed non-TLS multifd migration");
1136         return false;
1137     }
1138 #endif
1139
1140     if (params->has_x_vcpu_dirty_limit_period &&
1141         (params->x_vcpu_dirty_limit_period < 1 ||
1142          params->x_vcpu_dirty_limit_period > 1000)) {
1143         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1144                    "x-vcpu-dirty-limit-period",
1145                    "a value between 1 and 1000");
1146         return false;
1147     }
1148
1149     if (params->has_vcpu_dirty_limit &&
1150         (params->vcpu_dirty_limit < 1)) {
1151         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1152                    "vcpu_dirty_limit",
1153                    "is invalid, it must greater then 1 MB/s");
1154         return false;
1155     }
1156
1157     return true;
1158 }
1159
1160 static void migrate_params_test_apply(MigrateSetParameters *params,
1161                                       MigrationParameters *dest)
1162 {
1163     *dest = migrate_get_current()->parameters;
1164
1165     /* TODO use QAPI_CLONE() instead of duplicating it inline */
1166
1167     if (params->has_compress_level) {
1168         dest->compress_level = params->compress_level;
1169     }
1170
1171     if (params->has_compress_threads) {
1172         dest->compress_threads = params->compress_threads;
1173     }
1174
1175     if (params->has_compress_wait_thread) {
1176         dest->compress_wait_thread = params->compress_wait_thread;
1177     }
1178
1179     if (params->has_decompress_threads) {
1180         dest->decompress_threads = params->decompress_threads;
1181     }
1182
1183     if (params->has_throttle_trigger_threshold) {
1184         dest->throttle_trigger_threshold = params->throttle_trigger_threshold;
1185     }
1186
1187     if (params->has_cpu_throttle_initial) {
1188         dest->cpu_throttle_initial = params->cpu_throttle_initial;
1189     }
1190
1191     if (params->has_cpu_throttle_increment) {
1192         dest->cpu_throttle_increment = params->cpu_throttle_increment;
1193     }
1194
1195     if (params->has_cpu_throttle_tailslow) {
1196         dest->cpu_throttle_tailslow = params->cpu_throttle_tailslow;
1197     }
1198
1199     if (params->tls_creds) {
1200         assert(params->tls_creds->type == QTYPE_QSTRING);
1201         dest->tls_creds = params->tls_creds->u.s;
1202     }
1203
1204     if (params->tls_hostname) {
1205         assert(params->tls_hostname->type == QTYPE_QSTRING);
1206         dest->tls_hostname = params->tls_hostname->u.s;
1207     }
1208
1209     if (params->has_max_bandwidth) {
1210         dest->max_bandwidth = params->max_bandwidth;
1211     }
1212
1213     if (params->has_downtime_limit) {
1214         dest->downtime_limit = params->downtime_limit;
1215     }
1216
1217     if (params->has_x_checkpoint_delay) {
1218         dest->x_checkpoint_delay = params->x_checkpoint_delay;
1219     }
1220
1221     if (params->has_block_incremental) {
1222         dest->block_incremental = params->block_incremental;
1223     }
1224     if (params->has_multifd_channels) {
1225         dest->multifd_channels = params->multifd_channels;
1226     }
1227     if (params->has_multifd_compression) {
1228         dest->multifd_compression = params->multifd_compression;
1229     }
1230     if (params->has_xbzrle_cache_size) {
1231         dest->xbzrle_cache_size = params->xbzrle_cache_size;
1232     }
1233     if (params->has_max_postcopy_bandwidth) {
1234         dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth;
1235     }
1236     if (params->has_max_cpu_throttle) {
1237         dest->max_cpu_throttle = params->max_cpu_throttle;
1238     }
1239     if (params->has_announce_initial) {
1240         dest->announce_initial = params->announce_initial;
1241     }
1242     if (params->has_announce_max) {
1243         dest->announce_max = params->announce_max;
1244     }
1245     if (params->has_announce_rounds) {
1246         dest->announce_rounds = params->announce_rounds;
1247     }
1248     if (params->has_announce_step) {
1249         dest->announce_step = params->announce_step;
1250     }
1251
1252     if (params->has_block_bitmap_mapping) {
1253         dest->has_block_bitmap_mapping = true;
1254         dest->block_bitmap_mapping = params->block_bitmap_mapping;
1255     }
1256
1257     if (params->has_x_vcpu_dirty_limit_period) {
1258         dest->x_vcpu_dirty_limit_period =
1259             params->x_vcpu_dirty_limit_period;
1260     }
1261     if (params->has_vcpu_dirty_limit) {
1262         dest->vcpu_dirty_limit = params->vcpu_dirty_limit;
1263     }
1264 }
1265
1266 static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
1267 {
1268     MigrationState *s = migrate_get_current();
1269
1270     /* TODO use QAPI_CLONE() instead of duplicating it inline */
1271
1272     if (params->has_compress_level) {
1273         s->parameters.compress_level = params->compress_level;
1274     }
1275
1276     if (params->has_compress_threads) {
1277         s->parameters.compress_threads = params->compress_threads;
1278     }
1279
1280     if (params->has_compress_wait_thread) {
1281         s->parameters.compress_wait_thread = params->compress_wait_thread;
1282     }
1283
1284     if (params->has_decompress_threads) {
1285         s->parameters.decompress_threads = params->decompress_threads;
1286     }
1287
1288     if (params->has_throttle_trigger_threshold) {
1289         s->parameters.throttle_trigger_threshold = params->throttle_trigger_threshold;
1290     }
1291
1292     if (params->has_cpu_throttle_initial) {
1293         s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
1294     }
1295
1296     if (params->has_cpu_throttle_increment) {
1297         s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
1298     }
1299
1300     if (params->has_cpu_throttle_tailslow) {
1301         s->parameters.cpu_throttle_tailslow = params->cpu_throttle_tailslow;
1302     }
1303
1304     if (params->tls_creds) {
1305         g_free(s->parameters.tls_creds);
1306         assert(params->tls_creds->type == QTYPE_QSTRING);
1307         s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
1308     }
1309
1310     if (params->tls_hostname) {
1311         g_free(s->parameters.tls_hostname);
1312         assert(params->tls_hostname->type == QTYPE_QSTRING);
1313         s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
1314     }
1315
1316     if (params->tls_authz) {
1317         g_free(s->parameters.tls_authz);
1318         assert(params->tls_authz->type == QTYPE_QSTRING);
1319         s->parameters.tls_authz = g_strdup(params->tls_authz->u.s);
1320     }
1321
1322     if (params->has_max_bandwidth) {
1323         s->parameters.max_bandwidth = params->max_bandwidth;
1324         if (s->to_dst_file && !migration_in_postcopy()) {
1325             migration_rate_set(s->parameters.max_bandwidth);
1326         }
1327     }
1328
1329     if (params->has_downtime_limit) {
1330         s->parameters.downtime_limit = params->downtime_limit;
1331     }
1332
1333     if (params->has_x_checkpoint_delay) {
1334         s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
1335         colo_checkpoint_delay_set();
1336     }
1337
1338     if (params->has_block_incremental) {
1339         s->parameters.block_incremental = params->block_incremental;
1340     }
1341     if (params->has_multifd_channels) {
1342         s->parameters.multifd_channels = params->multifd_channels;
1343     }
1344     if (params->has_multifd_compression) {
1345         s->parameters.multifd_compression = params->multifd_compression;
1346     }
1347     if (params->has_xbzrle_cache_size) {
1348         s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
1349         xbzrle_cache_resize(params->xbzrle_cache_size, errp);
1350     }
1351     if (params->has_max_postcopy_bandwidth) {
1352         s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth;
1353         if (s->to_dst_file && migration_in_postcopy()) {
1354             migration_rate_set(s->parameters.max_postcopy_bandwidth);
1355         }
1356     }
1357     if (params->has_max_cpu_throttle) {
1358         s->parameters.max_cpu_throttle = params->max_cpu_throttle;
1359     }
1360     if (params->has_announce_initial) {
1361         s->parameters.announce_initial = params->announce_initial;
1362     }
1363     if (params->has_announce_max) {
1364         s->parameters.announce_max = params->announce_max;
1365     }
1366     if (params->has_announce_rounds) {
1367         s->parameters.announce_rounds = params->announce_rounds;
1368     }
1369     if (params->has_announce_step) {
1370         s->parameters.announce_step = params->announce_step;
1371     }
1372
1373     if (params->has_block_bitmap_mapping) {
1374         qapi_free_BitmapMigrationNodeAliasList(
1375             s->parameters.block_bitmap_mapping);
1376
1377         s->parameters.has_block_bitmap_mapping = true;
1378         s->parameters.block_bitmap_mapping =
1379             QAPI_CLONE(BitmapMigrationNodeAliasList,
1380                        params->block_bitmap_mapping);
1381     }
1382
1383     if (params->has_x_vcpu_dirty_limit_period) {
1384         s->parameters.x_vcpu_dirty_limit_period =
1385             params->x_vcpu_dirty_limit_period;
1386     }
1387     if (params->has_vcpu_dirty_limit) {
1388         s->parameters.vcpu_dirty_limit = params->vcpu_dirty_limit;
1389     }
1390 }
1391
1392 void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
1393 {
1394     MigrationParameters tmp;
1395
1396     /* TODO Rewrite "" to null instead */
1397     if (params->tls_creds
1398         && params->tls_creds->type == QTYPE_QNULL) {
1399         qobject_unref(params->tls_creds->u.n);
1400         params->tls_creds->type = QTYPE_QSTRING;
1401         params->tls_creds->u.s = strdup("");
1402     }
1403     /* TODO Rewrite "" to null instead */
1404     if (params->tls_hostname
1405         && params->tls_hostname->type == QTYPE_QNULL) {
1406         qobject_unref(params->tls_hostname->u.n);
1407         params->tls_hostname->type = QTYPE_QSTRING;
1408         params->tls_hostname->u.s = strdup("");
1409     }
1410
1411     migrate_params_test_apply(params, &tmp);
1412
1413     if (!migrate_params_check(&tmp, errp)) {
1414         /* Invalid parameter */
1415         return;
1416     }
1417
1418     migrate_params_apply(params, errp);
1419 }