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_SIZE("avail-switchover-bandwidth", MigrationState,
 129                       parameters.avail_switchover_bandwidth, 0),
 130     DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
 131                       parameters.downtime_limit,
 132                       DEFAULT_MIGRATE_SET_DOWNTIME),
 133     DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
 134                       parameters.x_checkpoint_delay,
 135                       DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
 136     DEFINE_PROP_UINT8("multifd-channels", MigrationState,
 137                       parameters.multifd_channels,
 138                       DEFAULT_MIGRATE_MULTIFD_CHANNELS),
 139     DEFINE_PROP_MULTIFD_COMPRESSION("multifd-compression", MigrationState,
 140                       parameters.multifd_compression,
 141                       DEFAULT_MIGRATE_MULTIFD_COMPRESSION),
 142     DEFINE_PROP_UINT8("multifd-zlib-level", MigrationState,
 143                       parameters.multifd_zlib_level,
 144                       DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL),
 145     DEFINE_PROP_UINT8("multifd-zstd-level", MigrationState,
 146                       parameters.multifd_zstd_level,
 147                       DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL),
 148     DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
 149                       parameters.xbzrle_cache_size,
 150                       DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
 151     DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState,
 152                       parameters.max_postcopy_bandwidth,
 153                       DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH),
 154     DEFINE_PROP_UINT8("max-cpu-throttle", MigrationState,
 155                       parameters.max_cpu_throttle,
 156                       DEFAULT_MIGRATE_MAX_CPU_THROTTLE),
 157     DEFINE_PROP_SIZE("announce-initial", MigrationState,
 158                       parameters.announce_initial,
 159                       DEFAULT_MIGRATE_ANNOUNCE_INITIAL),
 160     DEFINE_PROP_SIZE("announce-max", MigrationState,
 161                       parameters.announce_max,
 162                       DEFAULT_MIGRATE_ANNOUNCE_MAX),
 163     DEFINE_PROP_SIZE("announce-rounds", MigrationState,
 164                       parameters.announce_rounds,
 165                       DEFAULT_MIGRATE_ANNOUNCE_ROUNDS),
 166     DEFINE_PROP_SIZE("announce-step", MigrationState,
 167                       parameters.announce_step,
 168                       DEFAULT_MIGRATE_ANNOUNCE_STEP),
 169     DEFINE_PROP_STRING("tls-creds", MigrationState, parameters.tls_creds),
 170     DEFINE_PROP_STRING("tls-hostname", MigrationState, parameters.tls_hostname),
 171     DEFINE_PROP_STRING("tls-authz", MigrationState, parameters.tls_authz),
 172     DEFINE_PROP_UINT64("x-vcpu-dirty-limit-period", MigrationState,
 173                        parameters.x_vcpu_dirty_limit_period,
 174                        DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT_PERIOD),
 175     DEFINE_PROP_UINT64("vcpu-dirty-limit", MigrationState,
 176                        parameters.vcpu_dirty_limit,
 177                        DEFAULT_MIGRATE_VCPU_DIRTY_LIMIT),
 178
 179     /* Migration capabilities */
 180     DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
 181     DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
 182     DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
 183     DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
 184     DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
 185     DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
 186     DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
 187     DEFINE_PROP_MIG_CAP("x-postcopy-preempt",
 188                         MIGRATION_CAPABILITY_POSTCOPY_PREEMPT),
 189     DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
 190     DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
 191     DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
 192     DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
 193     DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD),
 194     DEFINE_PROP_MIG_CAP("x-background-snapshot",
 195             MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT),
 196 #ifdef CONFIG_LINUX
 197     DEFINE_PROP_MIG_CAP("x-zero-copy-send",
 198             MIGRATION_CAPABILITY_ZERO_COPY_SEND),
 199 #endif
 200     DEFINE_PROP_MIG_CAP("x-switchover-ack",
 201                         MIGRATION_CAPABILITY_SWITCHOVER_ACK),
 202     DEFINE_PROP_MIG_CAP("x-dirty-limit", MIGRATION_CAPABILITY_DIRTY_LIMIT),
 203     DEFINE_PROP_END_OF_LIST(),
 204 };
 205
 206 bool migrate_auto_converge(void)
 207 {
 208     MigrationState *s = migrate_get_current();
 209
 210     return s->capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
 211 }
 212
 213 bool migrate_background_snapshot(void)
 214 {
 215     MigrationState *s = migrate_get_current();
 216
 217     return s->capabilities[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT];
 218 }
 219
 220 bool migrate_block(void)
 221 {
 222     MigrationState *s = migrate_get_current();
 223
 224     return s->capabilities[MIGRATION_CAPABILITY_BLOCK];
 225 }
 226
 227 bool migrate_colo(void)
 228 {
 229     MigrationState *s = migrate_get_current();
 230
 231     return s->capabilities[MIGRATION_CAPABILITY_X_COLO];
 232 }
 233
 234 bool migrate_compress(void)
 235 {
 236     MigrationState *s = migrate_get_current();
 237
 238     return s->capabilities[MIGRATION_CAPABILITY_COMPRESS];
 239 }
 240
 241 bool migrate_dirty_bitmaps(void)
 242 {
 243     MigrationState *s = migrate_get_current();
 244
 245     return s->capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS];
 246 }
 247
 248 bool migrate_dirty_limit(void)
 249 {
 250     MigrationState *s = migrate_get_current();
 251
 252     return s->capabilities[MIGRATION_CAPABILITY_DIRTY_LIMIT];
 253 }
 254
 255 bool migrate_events(void)
 256 {
 257     MigrationState *s = migrate_get_current();
 258
 259     return s->capabilities[MIGRATION_CAPABILITY_EVENTS];
 260 }
 261
 262 bool migrate_ignore_shared(void)
 263 {
 264     MigrationState *s = migrate_get_current();
 265
 266     return s->capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED];
 267 }
 268
 269 bool migrate_late_block_activate(void)
 270 {
 271     MigrationState *s = migrate_get_current();
 272
 273     return s->capabilities[MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE];
 274 }
 275
 276 bool migrate_multifd(void)
 277 {
 278     MigrationState *s = migrate_get_current();
 279
 280     return s->capabilities[MIGRATION_CAPABILITY_MULTIFD];
 281 }
 282
 283 bool migrate_pause_before_switchover(void)
 284 {
 285     MigrationState *s = migrate_get_current();
 286
 287     return s->capabilities[MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
 288 }
 289
 290 bool migrate_postcopy_blocktime(void)
 291 {
 292     MigrationState *s = migrate_get_current();
 293
 294     return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME];
 295 }
 296
 297 bool migrate_postcopy_preempt(void)
 298 {
 299     MigrationState *s = migrate_get_current();
 300
 301     return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT];
 302 }
 303
 304 bool migrate_postcopy_ram(void)
 305 {
 306     MigrationState *s = migrate_get_current();
 307
 308     return s->capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
 309 }
 310
 311 bool migrate_rdma_pin_all(void)
 312 {
 313     MigrationState *s = migrate_get_current();
 314
 315     return s->capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL];
 316 }
 317
 318 bool migrate_release_ram(void)
 319 {
 320     MigrationState *s = migrate_get_current();
 321
 322     return s->capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
 323 }
 324
 325 bool migrate_return_path(void)
 326 {
 327     MigrationState *s = migrate_get_current();
 328
 329     return s->capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
 330 }
 331
 332 bool migrate_switchover_ack(void)
 333 {
 334     MigrationState *s = migrate_get_current();
 335
 336     return s->capabilities[MIGRATION_CAPABILITY_SWITCHOVER_ACK];
 337 }
 338
 339 bool migrate_validate_uuid(void)
 340 {
 341     MigrationState *s = migrate_get_current();
 342
 343     return s->capabilities[MIGRATION_CAPABILITY_VALIDATE_UUID];
 344 }
 345
 346 bool migrate_xbzrle(void)
 347 {
 348     MigrationState *s = migrate_get_current();
 349
 350     return s->capabilities[MIGRATION_CAPABILITY_XBZRLE];
 351 }
 352
 353 bool migrate_zero_blocks(void)
 354 {
 355     MigrationState *s = migrate_get_current();
 356
 357     return s->capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
 358 }
 359
 360 bool migrate_zero_copy_send(void)
 361 {
 362     MigrationState *s = migrate_get_current();
 363
 364     return s->capabilities[MIGRATION_CAPABILITY_ZERO_COPY_SEND];
 365 }
 366
 367 /* pseudo capabilities */
 368
 369 bool migrate_multifd_flush_after_each_section(void)
 370 {
 371     MigrationState *s = migrate_get_current();
 372
 373     return s->multifd_flush_after_each_section;
 374 }
 375
 376 bool migrate_postcopy(void)
 377 {
 378     return migrate_postcopy_ram() || migrate_dirty_bitmaps();
 379 }
 380
 381 bool migrate_rdma(void)
 382 {
 383     MigrationState *s = migrate_get_current();
 384
 385     return s->rdma_migration;
 386 }
 387
 388 bool migrate_tls(void)
 389 {
 390     MigrationState *s = migrate_get_current();
 391
 392     return s->parameters.tls_creds && *s->parameters.tls_creds;
 393 }
 394
 395 typedef enum WriteTrackingSupport {
 396     WT_SUPPORT_UNKNOWN = 0,
 397     WT_SUPPORT_ABSENT,
 398     WT_SUPPORT_AVAILABLE,
 399     WT_SUPPORT_COMPATIBLE
 400 } WriteTrackingSupport;
 401
 402 static
 403 WriteTrackingSupport migrate_query_write_tracking(void)
 404 {
 405     /* Check if kernel supports required UFFD features */
 406     if (!ram_write_tracking_available()) {
 407         return WT_SUPPORT_ABSENT;
 408     }
 409     /*
 410      * Check if current memory configuration is
 411      * compatible with required UFFD features.
 412      */
 413     if (!ram_write_tracking_compatible()) {
 414         return WT_SUPPORT_AVAILABLE;
 415     }
 416
 417     return WT_SUPPORT_COMPATIBLE;
 418 }
 419
 420 /* Migration capabilities set */
 421 struct MigrateCapsSet {
 422     int size;                       /* Capability set size */
 423     MigrationCapability caps[];     /* Variadic array of capabilities */
 424 };
 425 typedef struct MigrateCapsSet MigrateCapsSet;
 426
 427 /* Define and initialize MigrateCapsSet */
 428 #define INITIALIZE_MIGRATE_CAPS_SET(_name, ...)   \
 429     MigrateCapsSet _name = {    \
 430         .size = sizeof((int []) { __VA_ARGS__ }) / sizeof(int), \
 431         .caps = { __VA_ARGS__ } \
 432     }
 433
 434 /* Background-snapshot compatibility check list */
 435 static const
 436 INITIALIZE_MIGRATE_CAPS_SET(check_caps_background_snapshot,
 437     MIGRATION_CAPABILITY_POSTCOPY_RAM,
 438     MIGRATION_CAPABILITY_DIRTY_BITMAPS,
 439     MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME,
 440     MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE,
 441     MIGRATION_CAPABILITY_RETURN_PATH,
 442     MIGRATION_CAPABILITY_MULTIFD,
 443     MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER,
 444     MIGRATION_CAPABILITY_AUTO_CONVERGE,
 445     MIGRATION_CAPABILITY_RELEASE_RAM,
 446     MIGRATION_CAPABILITY_RDMA_PIN_ALL,
 447     MIGRATION_CAPABILITY_COMPRESS,
 448     MIGRATION_CAPABILITY_XBZRLE,
 449     MIGRATION_CAPABILITY_X_COLO,
 450     MIGRATION_CAPABILITY_VALIDATE_UUID,
 451     MIGRATION_CAPABILITY_ZERO_COPY_SEND);
 452
 453 static bool migrate_incoming_started(void)
 454 {
 455     return !!migration_incoming_get_current()->transport_data;
 456 }
 457
 458 /**
 459  * @migration_caps_check - check capability compatibility
 460  *
 461  * @old_caps: old capability list
 462  * @new_caps: new capability list
 463  * @errp: set *errp if the check failed, with reason
 464  *
 465  * Returns true if check passed, otherwise false.
 466  */
 467 bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
 468 {
 469     MigrationIncomingState *mis = migration_incoming_get_current();
 470
 471     ERRP_GUARD();
 472 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
 473     if (new_caps[MIGRATION_CAPABILITY_BLOCK]) {
 474         error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
 475                    "block migration");
 476         error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
 477         return false;
 478     }
 479 #endif
 480
 481 #ifndef CONFIG_REPLICATION
 482     if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
 483         error_setg(errp, "QEMU compiled without replication module"
 484                    " can't enable COLO");
 485         error_append_hint(errp, "Please enable replication before COLO.\n");
 486         return false;
 487     }
 488 #endif
 489
 490     if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
 491         /* This check is reasonably expensive, so only when it's being
 492          * set the first time, also it's only the destination that needs
 493          * special support.
 494          */
 495         if (!old_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM] &&
 496             runstate_check(RUN_STATE_INMIGRATE) &&
 497             !postcopy_ram_supported_by_host(mis, errp)) {
 498             error_prepend(errp, "Postcopy is not supported: ");
 499             return false;
 500         }
 501
 502         if (new_caps[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) {
 503             error_setg(errp, "Postcopy is not compatible with ignore-shared");
 504             return false;
 505         }
 506
 507         if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
 508             error_setg(errp, "Postcopy is not yet compatible with multifd");
 509             return false;
 510         }
 511     }
 512
 513     if (new_caps[MIGRATION_CAPABILITY_BACKGROUND_SNAPSHOT]) {
 514         WriteTrackingSupport wt_support;
 515         int idx;
 516         /*
 517          * Check if 'background-snapshot' capability is supported by
 518          * host kernel and compatible with guest memory configuration.
 519          */
 520         wt_support = migrate_query_write_tracking();
 521         if (wt_support < WT_SUPPORT_AVAILABLE) {
 522             error_setg(errp, "Background-snapshot is not supported by host kernel");
 523             return false;
 524         }
 525         if (wt_support < WT_SUPPORT_COMPATIBLE) {
 526             error_setg(errp, "Background-snapshot is not compatible "
 527                     "with guest memory configuration");
 528             return false;
 529         }
 530
 531         /*
 532          * Check if there are any migration capabilities
 533          * incompatible with 'background-snapshot'.
 534          */
 535         for (idx = 0; idx < check_caps_background_snapshot.size; idx++) {
 536             int incomp_cap = check_caps_background_snapshot.caps[idx];
 537             if (new_caps[incomp_cap]) {
 538                 error_setg(errp,
 539                         "Background-snapshot is not compatible with %s",
 540                         MigrationCapability_str(incomp_cap));
 541                 return false;
 542             }
 543         }
 544     }
 545
 546 #ifdef CONFIG_LINUX
 547     if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND] &&
 548         (!new_caps[MIGRATION_CAPABILITY_MULTIFD] ||
 549          new_caps[MIGRATION_CAPABILITY_COMPRESS] ||
 550          new_caps[MIGRATION_CAPABILITY_XBZRLE] ||
 551          migrate_multifd_compression() ||
 552          migrate_tls())) {
 553         error_setg(errp,
 554                    "Zero copy only available for non-compressed non-TLS multifd migration");
 555         return false;
 556     }
 557 #else
 558     if (new_caps[MIGRATION_CAPABILITY_ZERO_COPY_SEND]) {
 559         error_setg(errp,
 560                    "Zero copy currently only available on Linux");
 561         return false;
 562     }
 563 #endif
 564
 565     if (new_caps[MIGRATION_CAPABILITY_POSTCOPY_PREEMPT]) {
 566         if (!new_caps[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
 567             error_setg(errp, "Postcopy preempt requires postcopy-ram");
 568             return false;
 569         }
 570
 571         /*
 572          * Preempt mode requires urgent pages to be sent in separate
 573          * channel, OTOH compression logic will disorder all pages into
 574          * different compression channels, which is not compatible with the
 575          * preempt assumptions on channel assignments.
 576          */
 577         if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
 578             error_setg(errp, "Postcopy preempt not compatible with compress");
 579             return false;
 580         }
 581
 582         if (migrate_incoming_started()) {
 583             error_setg(errp,
 584                        "Postcopy preempt must be set before incoming starts");
 585             return false;
 586         }
 587     }
 588
 589     if (new_caps[MIGRATION_CAPABILITY_MULTIFD]) {
 590         if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
 591             error_setg(errp, "Multifd is not compatible with compress");
 592             return false;
 593         }
 594         if (migrate_incoming_started()) {
 595             error_setg(errp, "Multifd must be set before incoming starts");
 596             return false;
 597         }
 598     }
 599
 600     if (new_caps[MIGRATION_CAPABILITY_SWITCHOVER_ACK]) {
 601         if (!new_caps[MIGRATION_CAPABILITY_RETURN_PATH]) {
 602             error_setg(errp, "Capability 'switchover-ack' requires capability "
 603                              "'return-path'");
 604             return false;
 605         }
 606     }
 607     if (new_caps[MIGRATION_CAPABILITY_DIRTY_LIMIT]) {
 608         if (new_caps[MIGRATION_CAPABILITY_AUTO_CONVERGE]) {
 609             error_setg(errp, "dirty-limit conflicts with auto-converge"
 610                        " either of then available currently");
 611             return false;
 612         }
 613
 614         if (!kvm_enabled() || !kvm_dirty_ring_enabled()) {
 615             error_setg(errp, "dirty-limit requires KVM with accelerator"
 616                    " property 'dirty-ring-size' set");
 617             return false;
 618         }
 619     }
 620
 621     return true;
 622 }
 623
 624 bool migrate_cap_set(int cap, bool value, Error **errp)
 625 {
 626     MigrationState *s = migrate_get_current();
 627     bool new_caps[MIGRATION_CAPABILITY__MAX];
 628
 629     if (migration_is_running(s->state)) {
 630         error_setg(errp, QERR_MIGRATION_ACTIVE);
 631         return false;
 632     }
 633
 634     memcpy(new_caps, s->capabilities, sizeof(new_caps));
 635     new_caps[cap] = value;
 636
 637     if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
 638         return false;
 639     }
 640     s->capabilities[cap] = value;
 641     return true;
 642 }
 643
 644 MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
 645 {
 646     MigrationCapabilityStatusList *head = NULL, **tail = &head;
 647     MigrationCapabilityStatus *caps;
 648     MigrationState *s = migrate_get_current();
 649     int i;
 650
 651     for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
 652 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
 653         if (i == MIGRATION_CAPABILITY_BLOCK) {
 654             continue;
 655         }
 656 #endif
 657         caps = g_malloc0(sizeof(*caps));
 658         caps->capability = i;
 659         caps->state = s->capabilities[i];
 660         QAPI_LIST_APPEND(tail, caps);
 661     }
 662
 663     return head;
 664 }
 665
 666 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
 667                                   Error **errp)
 668 {
 669     MigrationState *s = migrate_get_current();
 670     MigrationCapabilityStatusList *cap;
 671     bool new_caps[MIGRATION_CAPABILITY__MAX];
 672
 673     if (migration_is_running(s->state) || migration_in_colo_state()) {
 674         error_setg(errp, QERR_MIGRATION_ACTIVE);
 675         return;
 676     }
 677
 678     memcpy(new_caps, s->capabilities, sizeof(new_caps));
 679     for (cap = params; cap; cap = cap->next) {
 680         new_caps[cap->value->capability] = cap->value->state;
 681     }
 682
 683     if (!migrate_caps_check(s->capabilities, new_caps, errp)) {
 684         return;
 685     }
 686
 687     for (cap = params; cap; cap = cap->next) {
 688         s->capabilities[cap->value->capability] = cap->value->state;
 689     }
 690 }
 691
 692 /* parameters */
 693
 694 const BitmapMigrationNodeAliasList *migrate_block_bitmap_mapping(void)
 695 {
 696     MigrationState *s = migrate_get_current();
 697
 698     return s->parameters.block_bitmap_mapping;
 699 }
 700
 701 bool migrate_has_block_bitmap_mapping(void)
 702 {
 703     MigrationState *s = migrate_get_current();
 704
 705     return s->parameters.has_block_bitmap_mapping;
 706 }
 707
 708 bool migrate_block_incremental(void)
 709 {
 710     MigrationState *s = migrate_get_current();
 711
 712     return s->parameters.block_incremental;
 713 }
 714
 715 uint32_t migrate_checkpoint_delay(void)
 716 {
 717     MigrationState *s = migrate_get_current();
 718
 719     return s->parameters.x_checkpoint_delay;
 720 }
 721
 722 int migrate_compress_level(void)
 723 {
 724     MigrationState *s = migrate_get_current();
 725
 726     return s->parameters.compress_level;
 727 }
 728
 729 int migrate_compress_threads(void)
 730 {
 731     MigrationState *s = migrate_get_current();
 732
 733     return s->parameters.compress_threads;
 734 }
 735
 736 int migrate_compress_wait_thread(void)
 737 {
 738     MigrationState *s = migrate_get_current();
 739
 740     return s->parameters.compress_wait_thread;
 741 }
 742
 743 uint8_t migrate_cpu_throttle_increment(void)
 744 {
 745     MigrationState *s = migrate_get_current();
 746
 747     return s->parameters.cpu_throttle_increment;
 748 }
 749
 750 uint8_t migrate_cpu_throttle_initial(void)
 751 {
 752     MigrationState *s = migrate_get_current();
 753
 754     return s->parameters.cpu_throttle_initial;
 755 }
 756
 757 bool migrate_cpu_throttle_tailslow(void)
 758 {
 759     MigrationState *s = migrate_get_current();
 760
 761     return s->parameters.cpu_throttle_tailslow;
 762 }
 763
 764 int migrate_decompress_threads(void)
 765 {
 766     MigrationState *s = migrate_get_current();
 767
 768     return s->parameters.decompress_threads;
 769 }
 770
 771 uint64_t migrate_downtime_limit(void)
 772 {
 773     MigrationState *s = migrate_get_current();
 774
 775     return s->parameters.downtime_limit;
 776 }
 777
 778 uint8_t migrate_max_cpu_throttle(void)
 779 {
 780     MigrationState *s = migrate_get_current();
 781
 782     return s->parameters.max_cpu_throttle;
 783 }
 784
 785 uint64_t migrate_max_bandwidth(void)
 786 {
 787     MigrationState *s = migrate_get_current();
 788
 789     return s->parameters.max_bandwidth;
 790 }
 791
 792 uint64_t migrate_avail_switchover_bandwidth(void)
 793 {
 794     MigrationState *s = migrate_get_current();
 795
 796     return s->parameters.avail_switchover_bandwidth;
 797 }
 798
 799 uint64_t migrate_max_postcopy_bandwidth(void)
 800 {
 801     MigrationState *s = migrate_get_current();
 802
 803     return s->parameters.max_postcopy_bandwidth;
 804 }
 805
 806 int migrate_multifd_channels(void)
 807 {
 808     MigrationState *s = migrate_get_current();
 809
 810     return s->parameters.multifd_channels;
 811 }
 812
 813 MultiFDCompression migrate_multifd_compression(void)
 814 {
 815     MigrationState *s = migrate_get_current();
 816
 817     assert(s->parameters.multifd_compression < MULTIFD_COMPRESSION__MAX);
 818     return s->parameters.multifd_compression;
 819 }
 820
 821 int migrate_multifd_zlib_level(void)
 822 {
 823     MigrationState *s = migrate_get_current();
 824
 825     return s->parameters.multifd_zlib_level;
 826 }
 827
 828 int migrate_multifd_zstd_level(void)
 829 {
 830     MigrationState *s = migrate_get_current();
 831
 832     return s->parameters.multifd_zstd_level;
 833 }
 834
 835 uint8_t migrate_throttle_trigger_threshold(void)
 836 {
 837     MigrationState *s = migrate_get_current();
 838
 839     return s->parameters.throttle_trigger_threshold;
 840 }
 841
 842 const char *migrate_tls_authz(void)
 843 {
 844     MigrationState *s = migrate_get_current();
 845
 846     return s->parameters.tls_authz;
 847 }
 848
 849 const char *migrate_tls_creds(void)
 850 {
 851     MigrationState *s = migrate_get_current();
 852
 853     return s->parameters.tls_creds;
 854 }
 855
 856 const char *migrate_tls_hostname(void)
 857 {
 858     MigrationState *s = migrate_get_current();
 859
 860     return s->parameters.tls_hostname;
 861 }
 862
 863 uint64_t migrate_xbzrle_cache_size(void)
 864 {
 865     MigrationState *s = migrate_get_current();
 866
 867     return s->parameters.xbzrle_cache_size;
 868 }
 869
 870 /* parameter setters */
 871
 872 void migrate_set_block_incremental(bool value)
 873 {
 874     MigrationState *s = migrate_get_current();
 875
 876     s->parameters.block_incremental = value;
 877 }
 878
 879 /* parameters helpers */
 880
 881 void block_cleanup_parameters(void)
 882 {
 883     MigrationState *s = migrate_get_current();
 884
 885     if (s->must_remove_block_options) {
 886         /* setting to false can never fail */
 887         migrate_cap_set(MIGRATION_CAPABILITY_BLOCK, false, &error_abort);
 888         migrate_set_block_incremental(false);
 889         s->must_remove_block_options = false;
 890     }
 891 }
 892
 893 AnnounceParameters *migrate_announce_params(void)
 894 {
 895     static AnnounceParameters ap;
 896
 897     MigrationState *s = migrate_get_current();
 898
 899     ap.initial = s->parameters.announce_initial;
 900     ap.max = s->parameters.announce_max;
 901     ap.rounds = s->parameters.announce_rounds;
 902     ap.step = s->parameters.announce_step;
 903
 904     return &ap;
 905 }
 906
 907 MigrationParameters *qmp_query_migrate_parameters(Error **errp)
 908 {
 909     MigrationParameters *params;
 910     MigrationState *s = migrate_get_current();
 911
 912     /* TODO use QAPI_CLONE() instead of duplicating it inline */
 913     params = g_malloc0(sizeof(*params));
 914     params->has_compress_level = true;
 915     params->compress_level = s->parameters.compress_level;
 916     params->has_compress_threads = true;
 917     params->compress_threads = s->parameters.compress_threads;
 918     params->has_compress_wait_thread = true;
 919     params->compress_wait_thread = s->parameters.compress_wait_thread;
 920     params->has_decompress_threads = true;
 921     params->decompress_threads = s->parameters.decompress_threads;
 922     params->has_throttle_trigger_threshold = true;
 923     params->throttle_trigger_threshold = s->parameters.throttle_trigger_threshold;
 924     params->has_cpu_throttle_initial = true;
 925     params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
 926     params->has_cpu_throttle_increment = true;
 927     params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
 928     params->has_cpu_throttle_tailslow = true;
 929     params->cpu_throttle_tailslow = s->parameters.cpu_throttle_tailslow;
 930     params->tls_creds = g_strdup(s->parameters.tls_creds);
 931     params->tls_hostname = g_strdup(s->parameters.tls_hostname);
 932     params->tls_authz = g_strdup(s->parameters.tls_authz ?
 933                                  s->parameters.tls_authz : "");
 934     params->has_max_bandwidth = true;
 935     params->max_bandwidth = s->parameters.max_bandwidth;
 936     params->has_avail_switchover_bandwidth = true;
 937     params->avail_switchover_bandwidth = s->parameters.avail_switchover_bandwidth;
 938     params->has_downtime_limit = true;
 939     params->downtime_limit = s->parameters.downtime_limit;
 940     params->has_x_checkpoint_delay = true;
 941     params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
 942     params->has_block_incremental = true;
 943     params->block_incremental = s->parameters.block_incremental;
 944     params->has_multifd_channels = true;
 945     params->multifd_channels = s->parameters.multifd_channels;
 946     params->has_multifd_compression = true;
 947     params->multifd_compression = s->parameters.multifd_compression;
 948     params->has_multifd_zlib_level = true;
 949     params->multifd_zlib_level = s->parameters.multifd_zlib_level;
 950     params->has_multifd_zstd_level = true;
 951     params->multifd_zstd_level = s->parameters.multifd_zstd_level;
 952     params->has_xbzrle_cache_size = true;
 953     params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
 954     params->has_max_postcopy_bandwidth = true;
 955     params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth;
 956     params->has_max_cpu_throttle = true;
 957     params->max_cpu_throttle = s->parameters.max_cpu_throttle;
 958     params->has_announce_initial = true;
 959     params->announce_initial = s->parameters.announce_initial;
 960     params->has_announce_max = true;
 961     params->announce_max = s->parameters.announce_max;
 962     params->has_announce_rounds = true;
 963     params->announce_rounds = s->parameters.announce_rounds;
 964     params->has_announce_step = true;
 965     params->announce_step = s->parameters.announce_step;
 966
 967     if (s->parameters.has_block_bitmap_mapping) {
 968         params->has_block_bitmap_mapping = true;
 969         params->block_bitmap_mapping =
 970             QAPI_CLONE(BitmapMigrationNodeAliasList,
 971                        s->parameters.block_bitmap_mapping);
 972     }
 973
 974     params->has_x_vcpu_dirty_limit_period = true;
 975     params->x_vcpu_dirty_limit_period = s->parameters.x_vcpu_dirty_limit_period;
 976     params->has_vcpu_dirty_limit = true;
 977     params->vcpu_dirty_limit = s->parameters.vcpu_dirty_limit;
 978
 979     return params;
 980 }
 981
 982 void migrate_params_init(MigrationParameters *params)
 983 {
 984     params->tls_hostname = g_strdup("");
 985     params->tls_creds = g_strdup("");
 986
 987     /* Set has_* up only for parameter checks */
 988     params->has_compress_level = true;
 989     params->has_compress_threads = true;
 990     params->has_compress_wait_thread = true;
 991     params->has_decompress_threads = true;
 992     params->has_throttle_trigger_threshold = true;
 993     params->has_cpu_throttle_initial = true;
 994     params->has_cpu_throttle_increment = true;
 995     params->has_cpu_throttle_tailslow = true;
 996     params->has_max_bandwidth = true;
 997     params->has_downtime_limit = true;
 998     params->has_x_checkpoint_delay = true;
 999     params->has_block_incremental = true;
1000     params->has_multifd_channels = true;
1001     params->has_multifd_compression = true;
1002     params->has_multifd_zlib_level = true;
1003     params->has_multifd_zstd_level = true;
1004     params->has_xbzrle_cache_size = true;
1005     params->has_max_postcopy_bandwidth = true;
1006     params->has_max_cpu_throttle = true;
1007     params->has_announce_initial = true;
1008     params->has_announce_max = true;
1009     params->has_announce_rounds = true;
1010     params->has_announce_step = true;
1011     params->has_x_vcpu_dirty_limit_period = true;
1012     params->has_vcpu_dirty_limit = true;
1013 }
1014
1015 /*
1016  * Check whether the parameters are valid. Error will be put into errp
1017  * (if provided). Return true if valid, otherwise false.
1018  */
1019 bool migrate_params_check(MigrationParameters *params, Error **errp)
1020 {
1021     if (params->has_compress_level &&
1022         (params->compress_level > 9)) {
1023         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
1024                    "a value between 0 and 9");
1025         return false;
1026     }
1027
1028     if (params->has_compress_threads && (params->compress_threads < 1)) {
1029         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1030                    "compress_threads",
1031                    "a value between 1 and 255");
1032         return false;
1033     }
1034
1035     if (params->has_decompress_threads && (params->decompress_threads < 1)) {
1036         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1037                    "decompress_threads",
1038                    "a value between 1 and 255");
1039         return false;
1040     }
1041
1042     if (params->has_throttle_trigger_threshold &&
1043         (params->throttle_trigger_threshold < 1 ||
1044          params->throttle_trigger_threshold > 100)) {
1045         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1046                    "throttle_trigger_threshold",
1047                    "an integer in the range of 1 to 100");
1048         return false;
1049     }
1050
1051     if (params->has_cpu_throttle_initial &&
1052         (params->cpu_throttle_initial < 1 ||
1053          params->cpu_throttle_initial > 99)) {
1054         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1055                    "cpu_throttle_initial",
1056                    "an integer in the range of 1 to 99");
1057         return false;
1058     }
1059
1060     if (params->has_cpu_throttle_increment &&
1061         (params->cpu_throttle_increment < 1 ||
1062          params->cpu_throttle_increment > 99)) {
1063         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1064                    "cpu_throttle_increment",
1065                    "an integer in the range of 1 to 99");
1066         return false;
1067     }
1068
1069     if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
1070         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1071                    "max_bandwidth",
1072                    "an integer in the range of 0 to "stringify(SIZE_MAX)
1073                    " bytes/second");
1074         return false;
1075     }
1076
1077     if (params->has_avail_switchover_bandwidth &&
1078         (params->avail_switchover_bandwidth > SIZE_MAX)) {
1079         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1080                    "avail_switchover_bandwidth",
1081                    "an integer in the range of 0 to "stringify(SIZE_MAX)
1082                    " bytes/second");
1083         return false;
1084     }
1085
1086     if (params->has_downtime_limit &&
1087         (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
1088         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1089                    "downtime_limit",
1090                    "an integer in the range of 0 to "
1091                     stringify(MAX_MIGRATE_DOWNTIME)" ms");
1092         return false;
1093     }
1094
1095     /* x_checkpoint_delay is now always positive */
1096
1097     if (params->has_multifd_channels && (params->multifd_channels < 1)) {
1098         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1099                    "multifd_channels",
1100                    "a value between 1 and 255");
1101         return false;
1102     }
1103
1104     if (params->has_multifd_zlib_level &&
1105         (params->multifd_zlib_level > 9)) {
1106         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zlib_level",
1107                    "a value between 0 and 9");
1108         return false;
1109     }
1110
1111     if (params->has_multifd_zstd_level &&
1112         (params->multifd_zstd_level > 20)) {
1113         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "multifd_zstd_level",
1114                    "a value between 0 and 20");
1115         return false;
1116     }
1117
1118     if (params->has_xbzrle_cache_size &&
1119         (params->xbzrle_cache_size < qemu_target_page_size() ||
1120          !is_power_of_2(params->xbzrle_cache_size))) {
1121         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1122                    "xbzrle_cache_size",
1123                    "a power of two no less than the target page size");
1124         return false;
1125     }
1126
1127     if (params->has_max_cpu_throttle &&
1128         (params->max_cpu_throttle < params->cpu_throttle_initial ||
1129          params->max_cpu_throttle > 99)) {
1130         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1131                    "max_cpu_throttle",
1132                    "an integer in the range of cpu_throttle_initial to 99");
1133         return false;
1134     }
1135
1136     if (params->has_announce_initial &&
1137         params->announce_initial > 100000) {
1138         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1139                    "announce_initial",
1140                    "a value between 0 and 100000");
1141         return false;
1142     }
1143     if (params->has_announce_max &&
1144         params->announce_max > 100000) {
1145         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1146                    "announce_max",
1147                    "a value between 0 and 100000");
1148        return false;
1149     }
1150     if (params->has_announce_rounds &&
1151         params->announce_rounds > 1000) {
1152         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1153                    "announce_rounds",
1154                    "a value between 0 and 1000");
1155        return false;
1156     }
1157     if (params->has_announce_step &&
1158         (params->announce_step < 1 ||
1159         params->announce_step > 10000)) {
1160         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1161                    "announce_step",
1162                    "a value between 0 and 10000");
1163        return false;
1164     }
1165
1166     if (params->has_block_bitmap_mapping &&
1167         !check_dirty_bitmap_mig_alias_map(params->block_bitmap_mapping, errp)) {
1168         error_prepend(errp, "Invalid mapping given for block-bitmap-mapping: ");
1169         return false;
1170     }
1171
1172 #ifdef CONFIG_LINUX
1173     if (migrate_zero_copy_send() &&
1174         ((params->has_multifd_compression && params->multifd_compression) ||
1175          (params->tls_creds && *params->tls_creds))) {
1176         error_setg(errp,
1177                    "Zero copy only available for non-compressed non-TLS multifd migration");
1178         return false;
1179     }
1180 #endif
1181
1182     if (params->has_x_vcpu_dirty_limit_period &&
1183         (params->x_vcpu_dirty_limit_period < 1 ||
1184          params->x_vcpu_dirty_limit_period > 1000)) {
1185         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1186                    "x-vcpu-dirty-limit-period",
1187                    "a value between 1 and 1000");
1188         return false;
1189     }
1190
1191     if (params->has_vcpu_dirty_limit &&
1192         (params->vcpu_dirty_limit < 1)) {
1193         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1194                    "vcpu_dirty_limit",
1195                    "is invalid, it must greater then 1 MB/s");
1196         return false;
1197     }
1198
1199     return true;
1200 }
1201
1202 static void migrate_params_test_apply(MigrateSetParameters *params,
1203                                       MigrationParameters *dest)
1204 {
1205     *dest = migrate_get_current()->parameters;
1206
1207     /* TODO use QAPI_CLONE() instead of duplicating it inline */
1208
1209     if (params->has_compress_level) {
1210         dest->compress_level = params->compress_level;
1211     }
1212
1213     if (params->has_compress_threads) {
1214         dest->compress_threads = params->compress_threads;
1215     }
1216
1217     if (params->has_compress_wait_thread) {
1218         dest->compress_wait_thread = params->compress_wait_thread;
1219     }
1220
1221     if (params->has_decompress_threads) {
1222         dest->decompress_threads = params->decompress_threads;
1223     }
1224
1225     if (params->has_throttle_trigger_threshold) {
1226         dest->throttle_trigger_threshold = params->throttle_trigger_threshold;
1227     }
1228
1229     if (params->has_cpu_throttle_initial) {
1230         dest->cpu_throttle_initial = params->cpu_throttle_initial;
1231     }
1232
1233     if (params->has_cpu_throttle_increment) {
1234         dest->cpu_throttle_increment = params->cpu_throttle_increment;
1235     }
1236
1237     if (params->has_cpu_throttle_tailslow) {
1238         dest->cpu_throttle_tailslow = params->cpu_throttle_tailslow;
1239     }
1240
1241     if (params->tls_creds) {
1242         assert(params->tls_creds->type == QTYPE_QSTRING);
1243         dest->tls_creds = params->tls_creds->u.s;
1244     }
1245
1246     if (params->tls_hostname) {
1247         assert(params->tls_hostname->type == QTYPE_QSTRING);
1248         dest->tls_hostname = params->tls_hostname->u.s;
1249     }
1250
1251     if (params->has_max_bandwidth) {
1252         dest->max_bandwidth = params->max_bandwidth;
1253     }
1254
1255     if (params->has_avail_switchover_bandwidth) {
1256         dest->avail_switchover_bandwidth = params->avail_switchover_bandwidth;
1257     }
1258
1259     if (params->has_downtime_limit) {
1260         dest->downtime_limit = params->downtime_limit;
1261     }
1262
1263     if (params->has_x_checkpoint_delay) {
1264         dest->x_checkpoint_delay = params->x_checkpoint_delay;
1265     }
1266
1267     if (params->has_block_incremental) {
1268         dest->block_incremental = params->block_incremental;
1269     }
1270     if (params->has_multifd_channels) {
1271         dest->multifd_channels = params->multifd_channels;
1272     }
1273     if (params->has_multifd_compression) {
1274         dest->multifd_compression = params->multifd_compression;
1275     }
1276     if (params->has_xbzrle_cache_size) {
1277         dest->xbzrle_cache_size = params->xbzrle_cache_size;
1278     }
1279     if (params->has_max_postcopy_bandwidth) {
1280         dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth;
1281     }
1282     if (params->has_max_cpu_throttle) {
1283         dest->max_cpu_throttle = params->max_cpu_throttle;
1284     }
1285     if (params->has_announce_initial) {
1286         dest->announce_initial = params->announce_initial;
1287     }
1288     if (params->has_announce_max) {
1289         dest->announce_max = params->announce_max;
1290     }
1291     if (params->has_announce_rounds) {
1292         dest->announce_rounds = params->announce_rounds;
1293     }
1294     if (params->has_announce_step) {
1295         dest->announce_step = params->announce_step;
1296     }
1297
1298     if (params->has_block_bitmap_mapping) {
1299         dest->has_block_bitmap_mapping = true;
1300         dest->block_bitmap_mapping = params->block_bitmap_mapping;
1301     }
1302
1303     if (params->has_x_vcpu_dirty_limit_period) {
1304         dest->x_vcpu_dirty_limit_period =
1305             params->x_vcpu_dirty_limit_period;
1306     }
1307     if (params->has_vcpu_dirty_limit) {
1308         dest->vcpu_dirty_limit = params->vcpu_dirty_limit;
1309     }
1310 }
1311
1312 static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
1313 {
1314     MigrationState *s = migrate_get_current();
1315
1316     /* TODO use QAPI_CLONE() instead of duplicating it inline */
1317
1318     if (params->has_compress_level) {
1319         s->parameters.compress_level = params->compress_level;
1320     }
1321
1322     if (params->has_compress_threads) {
1323         s->parameters.compress_threads = params->compress_threads;
1324     }
1325
1326     if (params->has_compress_wait_thread) {
1327         s->parameters.compress_wait_thread = params->compress_wait_thread;
1328     }
1329
1330     if (params->has_decompress_threads) {
1331         s->parameters.decompress_threads = params->decompress_threads;
1332     }
1333
1334     if (params->has_throttle_trigger_threshold) {
1335         s->parameters.throttle_trigger_threshold = params->throttle_trigger_threshold;
1336     }
1337
1338     if (params->has_cpu_throttle_initial) {
1339         s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
1340     }
1341
1342     if (params->has_cpu_throttle_increment) {
1343         s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
1344     }
1345
1346     if (params->has_cpu_throttle_tailslow) {
1347         s->parameters.cpu_throttle_tailslow = params->cpu_throttle_tailslow;
1348     }
1349
1350     if (params->tls_creds) {
1351         g_free(s->parameters.tls_creds);
1352         assert(params->tls_creds->type == QTYPE_QSTRING);
1353         s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
1354     }
1355
1356     if (params->tls_hostname) {
1357         g_free(s->parameters.tls_hostname);
1358         assert(params->tls_hostname->type == QTYPE_QSTRING);
1359         s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
1360     }
1361
1362     if (params->tls_authz) {
1363         g_free(s->parameters.tls_authz);
1364         assert(params->tls_authz->type == QTYPE_QSTRING);
1365         s->parameters.tls_authz = g_strdup(params->tls_authz->u.s);
1366     }
1367
1368     if (params->has_max_bandwidth) {
1369         s->parameters.max_bandwidth = params->max_bandwidth;
1370         if (s->to_dst_file && !migration_in_postcopy()) {
1371             migration_rate_set(s->parameters.max_bandwidth);
1372         }
1373     }
1374
1375     if (params->has_avail_switchover_bandwidth) {
1376         s->parameters.avail_switchover_bandwidth = params->avail_switchover_bandwidth;
1377     }
1378
1379     if (params->has_downtime_limit) {
1380         s->parameters.downtime_limit = params->downtime_limit;
1381     }
1382
1383     if (params->has_x_checkpoint_delay) {
1384         s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
1385         colo_checkpoint_delay_set();
1386     }
1387
1388     if (params->has_block_incremental) {
1389         s->parameters.block_incremental = params->block_incremental;
1390     }
1391     if (params->has_multifd_channels) {
1392         s->parameters.multifd_channels = params->multifd_channels;
1393     }
1394     if (params->has_multifd_compression) {
1395         s->parameters.multifd_compression = params->multifd_compression;
1396     }
1397     if (params->has_xbzrle_cache_size) {
1398         s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
1399         xbzrle_cache_resize(params->xbzrle_cache_size, errp);
1400     }
1401     if (params->has_max_postcopy_bandwidth) {
1402         s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth;
1403         if (s->to_dst_file && migration_in_postcopy()) {
1404             migration_rate_set(s->parameters.max_postcopy_bandwidth);
1405         }
1406     }
1407     if (params->has_max_cpu_throttle) {
1408         s->parameters.max_cpu_throttle = params->max_cpu_throttle;
1409     }
1410     if (params->has_announce_initial) {
1411         s->parameters.announce_initial = params->announce_initial;
1412     }
1413     if (params->has_announce_max) {
1414         s->parameters.announce_max = params->announce_max;
1415     }
1416     if (params->has_announce_rounds) {
1417         s->parameters.announce_rounds = params->announce_rounds;
1418     }
1419     if (params->has_announce_step) {
1420         s->parameters.announce_step = params->announce_step;
1421     }
1422
1423     if (params->has_block_bitmap_mapping) {
1424         qapi_free_BitmapMigrationNodeAliasList(
1425             s->parameters.block_bitmap_mapping);
1426
1427         s->parameters.has_block_bitmap_mapping = true;
1428         s->parameters.block_bitmap_mapping =
1429             QAPI_CLONE(BitmapMigrationNodeAliasList,
1430                        params->block_bitmap_mapping);
1431     }
1432
1433     if (params->has_x_vcpu_dirty_limit_period) {
1434         s->parameters.x_vcpu_dirty_limit_period =
1435             params->x_vcpu_dirty_limit_period;
1436     }
1437     if (params->has_vcpu_dirty_limit) {
1438         s->parameters.vcpu_dirty_limit = params->vcpu_dirty_limit;
1439     }
1440 }
1441
1442 void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
1443 {
1444     MigrationParameters tmp;
1445
1446     /* TODO Rewrite "" to null instead for all three tls_* parameters */
1447     if (params->tls_creds
1448         && params->tls_creds->type == QTYPE_QNULL) {
1449         qobject_unref(params->tls_creds->u.n);
1450         params->tls_creds->type = QTYPE_QSTRING;
1451         params->tls_creds->u.s = strdup("");
1452     }
1453     if (params->tls_hostname
1454         && params->tls_hostname->type == QTYPE_QNULL) {
1455         qobject_unref(params->tls_hostname->u.n);
1456         params->tls_hostname->type = QTYPE_QSTRING;
1457         params->tls_hostname->u.s = strdup("");
1458     }
1459     if (params->tls_authz
1460         && params->tls_authz->type == QTYPE_QNULL) {
1461         qobject_unref(params->tls_authz->u.n);
1462         params->tls_authz->type = QTYPE_QSTRING;
1463         params->tls_authz->u.s = strdup("");
1464     }
1465
1466     migrate_params_test_apply(params, &tmp);
1467
1468     if (!migrate_params_check(&tmp, errp)) {
1469         /* Invalid parameter */
1470         return;
1471     }
1472
1473     migrate_params_apply(params, errp);
1474 }