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