tests/migration-test.c

   1 /*
   2  * QTest testcase for migration
   3  *
   4  * Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
   5  *   based on the vhost-user-test.c that is:
   6  *      Copyright (c) 2014 Virtual Open Systems Sarl.
   7  *
   8  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   9  * See the COPYING file in the top-level directory.
  10  *
  11  */
  12
  13 #include "qemu/osdep.h"
  14
  15 #include "libqtest.h"
  16 #include "qapi/qmp/qdict.h"
  17 #include "qapi/qmp/qjson.h"
  18 #include "qemu/option.h"
  19 #include "qemu/range.h"
  20 #include "qemu/sockets.h"
  21 #include "chardev/char.h"
  22 #include "sysemu/sysemu.h"
  23
  24 /* TODO actually test the results and get rid of this */
  25 #define qtest_qmp_discard_response(...) qobject_unref(qtest_qmp(__VA_ARGS__))
  26
  27 const unsigned start_address = 1024 * 1024;
  28 const unsigned end_address = 100 * 1024 * 1024;
  29 bool got_stop;
  30 static bool uffd_feature_thread_id;
  31
  32 #if defined(__linux__)
  33 #include <sys/syscall.h>
  34 #include <sys/vfs.h>
  35 #endif
  36
  37 #if defined(__linux__) && defined(__NR_userfaultfd) && defined(CONFIG_EVENTFD)
  38 #include <sys/eventfd.h>
  39 #include <sys/ioctl.h>
  40 #include <linux/userfaultfd.h>
  41
  42 static bool ufd_version_check(void)
  43 {
  44     struct uffdio_api api_struct;
  45     uint64_t ioctl_mask;
  46
  47     int ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
  48
  49     if (ufd == -1) {
  50         g_test_message("Skipping test: userfaultfd not available");
  51         return false;
  52     }
  53
  54     api_struct.api = UFFD_API;
  55     api_struct.features = 0;
  56     if (ioctl(ufd, UFFDIO_API, &api_struct)) {
  57         g_test_message("Skipping test: UFFDIO_API failed");
  58         return false;
  59     }
  60     uffd_feature_thread_id = api_struct.features & UFFD_FEATURE_THREAD_ID;
  61
  62     ioctl_mask = (__u64)1 << _UFFDIO_REGISTER |
  63                  (__u64)1 << _UFFDIO_UNREGISTER;
  64     if ((api_struct.ioctls & ioctl_mask) != ioctl_mask) {
  65         g_test_message("Skipping test: Missing userfault feature");
  66         return false;
  67     }
  68
  69     return true;
  70 }
  71
  72 #else
  73 static bool ufd_version_check(void)
  74 {
  75     g_test_message("Skipping test: Userfault not available (builtdtime)");
  76     return false;
  77 }
  78
  79 #endif
  80
  81 static const char *tmpfs;
  82
  83 /* A simple PC boot sector that modifies memory (1-100MB) quickly
  84  * outputting a 'B' every so often if it's still running.
  85  */
  86 #include "tests/migration/x86-a-b-bootblock.h"
  87
  88 static void init_bootfile_x86(const char *bootpath)
  89 {
  90     FILE *bootfile = fopen(bootpath, "wb");
  91
  92     g_assert_cmpint(fwrite(x86_bootsect, 512, 1, bootfile), ==, 1);
  93     fclose(bootfile);
  94 }
  95
  96 /*
  97  * Wait for some output in the serial output file,
  98  * we get an 'A' followed by an endless string of 'B's
  99  * but on the destination we won't have the A.
 100  */
 101 static void wait_for_serial(const char *side)
 102 {
 103     char *serialpath = g_strdup_printf("%s/%s", tmpfs, side);
 104     FILE *serialfile = fopen(serialpath, "r");
 105     const char *arch = qtest_get_arch();
 106     int started = (strcmp(side, "src_serial") == 0 &&
 107                    strcmp(arch, "ppc64") == 0) ? 0 : 1;
 108
 109     g_free(serialpath);
 110     do {
 111         int readvalue = fgetc(serialfile);
 112
 113         if (!started) {
 114             /* SLOF prints its banner before starting test,
 115              * to ignore it, mark the start of the test with '_',
 116              * ignore all characters until this marker
 117              */
 118             switch (readvalue) {
 119             case '_':
 120                 started = 1;
 121                 break;
 122             case EOF:
 123                 fseek(serialfile, 0, SEEK_SET);
 124                 usleep(1000);
 125                 break;
 126             }
 127             continue;
 128         }
 129         switch (readvalue) {
 130         case 'A':
 131             /* Fine */
 132             break;
 133
 134         case 'B':
 135             /* It's alive! */
 136             fclose(serialfile);
 137             return;
 138
 139         case EOF:
 140             started = (strcmp(side, "src_serial") == 0 &&
 141                        strcmp(arch, "ppc64") == 0) ? 0 : 1;
 142             fseek(serialfile, 0, SEEK_SET);
 143             usleep(1000);
 144             break;
 145
 146         default:
 147             fprintf(stderr, "Unexpected %d on %s serial\n", readvalue, side);
 148             g_assert_not_reached();
 149         }
 150     } while (true);
 151 }
 152
 153 static void stop_cb(void *opaque, const char *name, QDict *data)
 154 {
 155     if (!strcmp(name, "STOP")) {
 156         got_stop = true;
 157     }
 158 }
 159
 160 /*
 161  * Events can get in the way of responses we are actually waiting for.
 162  */
 163 GCC_FMT_ATTR(2, 3)
 164 static QDict *wait_command(QTestState *who, const char *command, ...)
 165 {
 166     va_list ap;
 167
 168     va_start(ap, command);
 169     qtest_qmp_vsend(who, command, ap);
 170     va_end(ap);
 171
 172     return qtest_qmp_receive_success(who, stop_cb, NULL);
 173 }
 174
 175 /*
 176  * Note: caller is responsible to free the returned object via
 177  * qobject_unref() after use
 178  */
 179 static QDict *migrate_query(QTestState *who)
 180 {
 181     return wait_command(who, "{ 'execute': 'query-migrate' }");
 182 }
 183
 184 /*
 185  * Note: caller is responsible to free the returned object via
 186  * g_free() after use
 187  */
 188 static gchar *migrate_query_status(QTestState *who)
 189 {
 190     QDict *rsp_return = migrate_query(who);
 191     gchar *status = g_strdup(qdict_get_str(rsp_return, "status"));
 192
 193     g_assert(status);
 194     qobject_unref(rsp_return);
 195
 196     return status;
 197 }
 198
 199 /*
 200  * It's tricky to use qemu's migration event capability with qtest,
 201  * events suddenly appearing confuse the qmp()/hmp() responses.
 202  */
 203
 204 static uint64_t get_migration_pass(QTestState *who)
 205 {
 206     QDict *rsp_return, *rsp_ram;
 207     uint64_t result;
 208
 209     rsp_return = migrate_query(who);
 210     if (!qdict_haskey(rsp_return, "ram")) {
 211         /* Still in setup */
 212         result = 0;
 213     } else {
 214         rsp_ram = qdict_get_qdict(rsp_return, "ram");
 215         result = qdict_get_try_int(rsp_ram, "dirty-sync-count", 0);
 216     }
 217     qobject_unref(rsp_return);
 218     return result;
 219 }
 220
 221 static void read_blocktime(QTestState *who)
 222 {
 223     QDict *rsp_return;
 224
 225     rsp_return = migrate_query(who);
 226     g_assert(qdict_haskey(rsp_return, "postcopy-blocktime"));
 227     qobject_unref(rsp_return);
 228 }
 229
 230 static void wait_for_migration_status(QTestState *who,
 231                                       const char *goal)
 232 {
 233     while (true) {
 234         bool completed;
 235         char *status;
 236
 237         status = migrate_query_status(who);
 238         completed = strcmp(status, goal) == 0;
 239         g_assert_cmpstr(status, !=,  "failed");
 240         g_free(status);
 241         if (completed) {
 242             return;
 243         }
 244         usleep(1000);
 245     }
 246 }
 247
 248 static void wait_for_migration_complete(QTestState *who)
 249 {
 250     wait_for_migration_status(who, "completed");
 251 }
 252
 253 static void wait_for_migration_pass(QTestState *who)
 254 {
 255     uint64_t initial_pass = get_migration_pass(who);
 256     uint64_t pass;
 257
 258     /* Wait for the 1st sync */
 259     while (!got_stop && !initial_pass) {
 260         usleep(1000);
 261         initial_pass = get_migration_pass(who);
 262     }
 263
 264     do {
 265         usleep(1000);
 266         pass = get_migration_pass(who);
 267     } while (pass == initial_pass && !got_stop);
 268 }
 269
 270 static void check_guests_ram(QTestState *who)
 271 {
 272     /* Our ASM test will have been incrementing one byte from each page from
 273      * 1MB to <100MB in order.
 274      * This gives us a constraint that any page's byte should be equal or less
 275      * than the previous pages byte (mod 256); and they should all be equal
 276      * except for one transition at the point where we meet the incrementer.
 277      * (We're running this with the guest stopped).
 278      */
 279     unsigned address;
 280     uint8_t first_byte;
 281     uint8_t last_byte;
 282     bool hit_edge = false;
 283     bool bad = false;
 284
 285     qtest_memread(who, start_address, &first_byte, 1);
 286     last_byte = first_byte;
 287
 288     for (address = start_address + 4096; address < end_address; address += 4096)
 289     {
 290         uint8_t b;
 291         qtest_memread(who, address, &b, 1);
 292         if (b != last_byte) {
 293             if (((b + 1) % 256) == last_byte && !hit_edge) {
 294                 /* This is OK, the guest stopped at the point of
 295                  * incrementing the previous page but didn't get
 296                  * to us yet.
 297                  */
 298                 hit_edge = true;
 299                 last_byte = b;
 300             } else {
 301                 fprintf(stderr, "Memory content inconsistency at %x"
 302                                 " first_byte = %x last_byte = %x current = %x"
 303                                 " hit_edge = %x\n",
 304                                 address, first_byte, last_byte, b, hit_edge);
 305                 bad = true;
 306             }
 307         }
 308     }
 309     g_assert_false(bad);
 310 }
 311
 312 static void cleanup(const char *filename)
 313 {
 314     char *path = g_strdup_printf("%s/%s", tmpfs, filename);
 315
 316     unlink(path);
 317     g_free(path);
 318 }
 319
 320 static void migrate_check_parameter(QTestState *who, const char *parameter,
 321                                     const char *value)
 322 {
 323     QDict *rsp_return;
 324     char *result;
 325
 326     rsp_return = wait_command(who,
 327                               "{ 'execute': 'query-migrate-parameters' }");
 328     result = g_strdup_printf("%" PRId64,
 329                              qdict_get_try_int(rsp_return,  parameter, -1));
 330     g_assert_cmpstr(result, ==, value);
 331     g_free(result);
 332     qobject_unref(rsp_return);
 333 }
 334
 335 static void migrate_set_parameter(QTestState *who, const char *parameter,
 336                                   const char *value)
 337 {
 338     QDict *rsp;
 339     gchar *cmd;
 340
 341     cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
 342                           "'arguments': { '%s': %s } }",
 343                           parameter, value);
 344     rsp = qtest_qmp(who, cmd);
 345     g_free(cmd);
 346     g_assert(qdict_haskey(rsp, "return"));
 347     qobject_unref(rsp);
 348     migrate_check_parameter(who, parameter, value);
 349 }
 350
 351 static void migrate_pause(QTestState *who)
 352 {
 353     QDict *rsp;
 354
 355     rsp = wait_command(who, "{ 'execute': 'migrate-pause' }");
 356     qobject_unref(rsp);
 357 }
 358
 359 static void migrate_recover(QTestState *who, const char *uri)
 360 {
 361     QDict *rsp;
 362
 363     rsp = wait_command(who,
 364                        "{ 'execute': 'migrate-recover', "
 365                        "  'id': 'recover-cmd', "
 366                        "  'arguments': { 'uri': %s } }",
 367                        uri);
 368     qobject_unref(rsp);
 369 }
 370
 371 static void migrate_set_capability(QTestState *who, const char *capability,
 372                                    const char *value)
 373 {
 374     QDict *rsp;
 375     gchar *cmd;
 376
 377     cmd = g_strdup_printf("{ 'execute': 'migrate-set-capabilities',"
 378                           "'arguments': { "
 379                           "'capabilities': [ { "
 380                           "'capability': '%s', 'state': %s } ] } }",
 381                           capability, value);
 382     rsp = qtest_qmp(who, cmd);
 383     g_free(cmd);
 384     g_assert(qdict_haskey(rsp, "return"));
 385     qobject_unref(rsp);
 386 }
 387
 388 /*
 389  * Send QMP command "migrate".
 390  * Arguments are built from @fmt... (formatted like
 391  * qobject_from_jsonf_nofail()) with "uri": @uri spliced in.
 392  */
 393 GCC_FMT_ATTR(3, 4)
 394 static void migrate(QTestState *who, const char *uri, const char *fmt, ...)
 395 {
 396     va_list ap;
 397     QDict *args, *rsp;
 398
 399     va_start(ap, fmt);
 400     args = qdict_from_vjsonf_nofail(fmt, ap);
 401     va_end(ap);
 402
 403     g_assert(!qdict_haskey(args, "uri"));
 404     qdict_put_str(args, "uri", uri);
 405
 406     rsp = qmp("{ 'execute': 'migrate', 'arguments': %p}", args);
 407     g_assert(qdict_haskey(rsp, "return"));
 408     qobject_unref(rsp);
 409 }
 410
 411 static void migrate_postcopy_start(QTestState *from, QTestState *to)
 412 {
 413     QDict *rsp;
 414
 415     rsp = wait_command(from, "{ 'execute': 'migrate-start-postcopy' }");
 416     qobject_unref(rsp);
 417
 418     if (!got_stop) {
 419         qtest_qmp_eventwait(from, "STOP");
 420     }
 421
 422     qtest_qmp_eventwait(to, "RESUME");
 423 }
 424
 425 static int test_migrate_start(QTestState **from, QTestState **to,
 426                                const char *uri, bool hide_stderr)
 427 {
 428     gchar *cmd_src, *cmd_dst;
 429     char *bootpath = g_strdup_printf("%s/bootsect", tmpfs);
 430     const char *arch = qtest_get_arch();
 431     const char *accel = "kvm:tcg";
 432
 433     got_stop = false;
 434
 435     if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
 436         init_bootfile_x86(bootpath);
 437         cmd_src = g_strdup_printf("-machine accel=%s -m 150M"
 438                                   " -name source,debug-threads=on"
 439                                   " -serial file:%s/src_serial"
 440                                   " -drive file=%s,format=raw",
 441                                   accel, tmpfs, bootpath);
 442         cmd_dst = g_strdup_printf("-machine accel=%s -m 150M"
 443                                   " -name target,debug-threads=on"
 444                                   " -serial file:%s/dest_serial"
 445                                   " -drive file=%s,format=raw"
 446                                   " -incoming %s",
 447                                   accel, tmpfs, bootpath, uri);
 448     } else if (strcmp(arch, "ppc64") == 0) {
 449
 450         /* On ppc64, the test only works with kvm-hv, but not with kvm-pr
 451          * and TCG is touchy due to race conditions on dirty bits
 452          * (especially on PPC for some reason)
 453          */
 454         if (access("/sys/module/kvm_hv", F_OK)) {
 455             g_print("Skipping test: kvm_hv not available ");
 456             return -1;
 457         }
 458         cmd_src = g_strdup_printf("-machine accel=%s -m 256M"
 459                                   " -name source,debug-threads=on"
 460                                   " -serial file:%s/src_serial"
 461                                   " -prom-env '"
 462                                   "boot-command=hex .\" _\" begin %x %x "
 463                                   "do i c@ 1 + i c! 1000 +loop .\" B\" 0 "
 464                                   "until'",  accel, tmpfs, end_address,
 465                                   start_address);
 466         cmd_dst = g_strdup_printf("-machine accel=%s -m 256M"
 467                                   " -name target,debug-threads=on"
 468                                   " -serial file:%s/dest_serial"
 469                                   " -incoming %s",
 470                                   accel, tmpfs, uri);
 471     } else {
 472         g_assert_not_reached();
 473     }
 474
 475     g_free(bootpath);
 476
 477     if (hide_stderr) {
 478         gchar *tmp;
 479         tmp = g_strdup_printf("%s 2>/dev/null", cmd_src);
 480         g_free(cmd_src);
 481         cmd_src = tmp;
 482
 483         tmp = g_strdup_printf("%s 2>/dev/null", cmd_dst);
 484         g_free(cmd_dst);
 485         cmd_dst = tmp;
 486     }
 487
 488     *from = qtest_start(cmd_src);
 489     g_free(cmd_src);
 490
 491     *to = qtest_init(cmd_dst);
 492     g_free(cmd_dst);
 493     return 0;
 494 }
 495
 496 static void test_migrate_end(QTestState *from, QTestState *to, bool test_dest)
 497 {
 498     unsigned char dest_byte_a, dest_byte_b, dest_byte_c, dest_byte_d;
 499
 500     qtest_quit(from);
 501
 502     if (test_dest) {
 503         qtest_memread(to, start_address, &dest_byte_a, 1);
 504
 505         /* Destination still running, wait for a byte to change */
 506         do {
 507             qtest_memread(to, start_address, &dest_byte_b, 1);
 508             usleep(1000 * 10);
 509         } while (dest_byte_a == dest_byte_b);
 510
 511         qtest_qmp_discard_response(to, "{ 'execute' : 'stop'}");
 512
 513         /* With it stopped, check nothing changes */
 514         qtest_memread(to, start_address, &dest_byte_c, 1);
 515         usleep(1000 * 200);
 516         qtest_memread(to, start_address, &dest_byte_d, 1);
 517         g_assert_cmpint(dest_byte_c, ==, dest_byte_d);
 518
 519         check_guests_ram(to);
 520     }
 521
 522     qtest_quit(to);
 523
 524     cleanup("bootsect");
 525     cleanup("migsocket");
 526     cleanup("src_serial");
 527     cleanup("dest_serial");
 528 }
 529
 530 static void deprecated_set_downtime(QTestState *who, const double value)
 531 {
 532     QDict *rsp;
 533     char *expected;
 534     int64_t result_int;
 535
 536     rsp = qtest_qmp(who,
 537                     "{ 'execute': 'migrate_set_downtime',"
 538                     " 'arguments': { 'value': %f } }", value);
 539     g_assert(qdict_haskey(rsp, "return"));
 540     qobject_unref(rsp);
 541     result_int = value * 1000L;
 542     expected = g_strdup_printf("%" PRId64, result_int);
 543     migrate_check_parameter(who, "downtime-limit", expected);
 544     g_free(expected);
 545 }
 546
 547 static void deprecated_set_speed(QTestState *who, const char *value)
 548 {
 549     QDict *rsp;
 550     gchar *cmd;
 551
 552     cmd = g_strdup_printf("{ 'execute': 'migrate_set_speed',"
 553                           "'arguments': { 'value': %s } }", value);
 554     rsp = qtest_qmp(who, cmd);
 555     g_free(cmd);
 556     g_assert(qdict_haskey(rsp, "return"));
 557     qobject_unref(rsp);
 558     migrate_check_parameter(who, "max-bandwidth", value);
 559 }
 560
 561 static void test_deprecated(void)
 562 {
 563     QTestState *from;
 564
 565     from = qtest_start("");
 566
 567     deprecated_set_downtime(from, 0.12345);
 568     deprecated_set_speed(from, "12345");
 569
 570     qtest_quit(from);
 571 }
 572
 573 static int migrate_postcopy_prepare(QTestState **from_ptr,
 574                                      QTestState **to_ptr,
 575                                      bool hide_error)
 576 {
 577     char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
 578     QTestState *from, *to;
 579
 580     if (test_migrate_start(&from, &to, uri, hide_error)) {
 581         return -1;
 582     }
 583
 584     migrate_set_capability(from, "postcopy-ram", "true");
 585     migrate_set_capability(to, "postcopy-ram", "true");
 586     migrate_set_capability(to, "postcopy-blocktime", "true");
 587
 588     /* We want to pick a speed slow enough that the test completes
 589      * quickly, but that it doesn't complete precopy even on a slow
 590      * machine, so also set the downtime.
 591      */
 592     migrate_set_parameter(from, "max-bandwidth", "100000000");
 593     migrate_set_parameter(from, "downtime-limit", "1");
 594
 595     /* Wait for the first serial output from the source */
 596     wait_for_serial("src_serial");
 597
 598     migrate(from, uri, "{}");
 599     g_free(uri);
 600
 601     wait_for_migration_pass(from);
 602
 603     *from_ptr = from;
 604     *to_ptr = to;
 605
 606     return 0;
 607 }
 608
 609 static void migrate_postcopy_complete(QTestState *from, QTestState *to)
 610 {
 611     wait_for_migration_complete(from);
 612
 613     /* Make sure we get at least one "B" on destination */
 614     wait_for_serial("dest_serial");
 615
 616     if (uffd_feature_thread_id) {
 617         read_blocktime(to);
 618     }
 619
 620     test_migrate_end(from, to, true);
 621 }
 622
 623 static void test_postcopy(void)
 624 {
 625     QTestState *from, *to;
 626
 627     if (migrate_postcopy_prepare(&from, &to, false)) {
 628         return;
 629     }
 630     migrate_postcopy_start(from, to);
 631     migrate_postcopy_complete(from, to);
 632 }
 633
 634 static void test_postcopy_recovery(void)
 635 {
 636     QTestState *from, *to;
 637     char *uri;
 638
 639     if (migrate_postcopy_prepare(&from, &to, true)) {
 640         return;
 641     }
 642
 643     /* Turn postcopy speed down, 4K/s is slow enough on any machines */
 644     migrate_set_parameter(from, "max-postcopy-bandwidth", "4096");
 645
 646     /* Now we start the postcopy */
 647     migrate_postcopy_start(from, to);
 648
 649     /*
 650      * Wait until postcopy is really started; we can only run the
 651      * migrate-pause command during a postcopy
 652      */
 653     wait_for_migration_status(from, "postcopy-active");
 654
 655     /*
 656      * Manually stop the postcopy migration. This emulates a network
 657      * failure with the migration socket
 658      */
 659     migrate_pause(from);
 660
 661     /*
 662      * Wait for destination side to reach postcopy-paused state.  The
 663      * migrate-recover command can only succeed if destination machine
 664      * is in the paused state
 665      */
 666     wait_for_migration_status(to, "postcopy-paused");
 667
 668     /*
 669      * Create a new socket to emulate a new channel that is different
 670      * from the broken migration channel; tell the destination to
 671      * listen to the new port
 672      */
 673     uri = g_strdup_printf("unix:%s/migsocket-recover", tmpfs);
 674     migrate_recover(to, uri);
 675
 676     /*
 677      * Try to rebuild the migration channel using the resume flag and
 678      * the newly created channel
 679      */
 680     wait_for_migration_status(from, "postcopy-paused");
 681     migrate(from, uri, "{'resume': true}");
 682     g_free(uri);
 683
 684     /* Restore the postcopy bandwidth to unlimited */
 685     migrate_set_parameter(from, "max-postcopy-bandwidth", "0");
 686
 687     migrate_postcopy_complete(from, to);
 688 }
 689
 690 static void test_baddest(void)
 691 {
 692     QTestState *from, *to;
 693     QDict *rsp_return;
 694     char *status;
 695     bool failed;
 696
 697     if (test_migrate_start(&from, &to, "tcp:0:0", true)) {
 698         return;
 699     }
 700     migrate(from, "tcp:0:0", "{}");
 701     do {
 702         status = migrate_query_status(from);
 703         g_assert(!strcmp(status, "setup") || !(strcmp(status, "failed")));
 704         failed = !strcmp(status, "failed");
 705         g_free(status);
 706     } while (!failed);
 707
 708     /* Is the machine currently running? */
 709     rsp_return = wait_command(from, "{ 'execute': 'query-status' }");
 710     g_assert(qdict_haskey(rsp_return, "running"));
 711     g_assert(qdict_get_bool(rsp_return, "running"));
 712     qobject_unref(rsp_return);
 713
 714     test_migrate_end(from, to, false);
 715 }
 716
 717 static void test_precopy_unix(void)
 718 {
 719     char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
 720     QTestState *from, *to;
 721
 722     if (test_migrate_start(&from, &to, uri, false)) {
 723         return;
 724     }
 725
 726     /* We want to pick a speed slow enough that the test completes
 727      * quickly, but that it doesn't complete precopy even on a slow
 728      * machine, so also set the downtime.
 729      */
 730     /* 1 ms should make it not converge*/
 731     migrate_set_parameter(from, "downtime-limit", "1");
 732     /* 1GB/s */
 733     migrate_set_parameter(from, "max-bandwidth", "1000000000");
 734
 735     /* Wait for the first serial output from the source */
 736     wait_for_serial("src_serial");
 737
 738     migrate(from, uri, "{}");
 739
 740     wait_for_migration_pass(from);
 741
 742     /* 300 ms should converge */
 743     migrate_set_parameter(from, "downtime-limit", "300");
 744
 745     if (!got_stop) {
 746         qtest_qmp_eventwait(from, "STOP");
 747     }
 748
 749     qtest_qmp_eventwait(to, "RESUME");
 750
 751     wait_for_serial("dest_serial");
 752     wait_for_migration_complete(from);
 753
 754     test_migrate_end(from, to, true);
 755     g_free(uri);
 756 }
 757
 758 int main(int argc, char **argv)
 759 {
 760     char template[] = "/tmp/migration-test-XXXXXX";
 761     int ret;
 762
 763     g_test_init(&argc, &argv, NULL);
 764
 765     if (!ufd_version_check()) {
 766         return 0;
 767     }
 768
 769     tmpfs = mkdtemp(template);
 770     if (!tmpfs) {
 771         g_test_message("mkdtemp on path (%s): %s\n", template, strerror(errno));
 772     }
 773     g_assert(tmpfs);
 774
 775     module_call_init(MODULE_INIT_QOM);
 776
 777     qtest_add_func("/migration/postcopy/unix", test_postcopy);
 778     qtest_add_func("/migration/postcopy/recovery", test_postcopy_recovery);
 779     qtest_add_func("/migration/deprecated", test_deprecated);
 780     qtest_add_func("/migration/bad_dest", test_baddest);
 781     qtest_add_func("/migration/precopy/unix", test_precopy_unix);
 782
 783     ret = g_test_run();
 784
 785     g_assert_cmpint(ret, ==, 0);
 786
 787     ret = rmdir(tmpfs);
 788     if (ret != 0) {
 789         g_test_message("unable to rmdir: path (%s): %s\n",
 790                        tmpfs, strerror(errno));
 791     }
 792
 793     return ret;
 794 }