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 "qemu/option.h"
  18 #include "qemu/range.h"
  19 #include "qemu/sockets.h"
  20 #include "chardev/char.h"
  21 #include "sysemu/sysemu.h"
  22
  23 /* TODO actually test the results and get rid of this */
  24 #define qtest_qmp_discard_response(...) qobject_unref(qtest_qmp(__VA_ARGS__))
  25
  26 const unsigned start_address = 1024 * 1024;
  27 const unsigned end_address = 100 * 1024 * 1024;
  28 bool got_stop;
  29 static bool uffd_feature_thread_id;
  30
  31 #if defined(__linux__)
  32 #include <sys/syscall.h>
  33 #include <sys/vfs.h>
  34 #endif
  35
  36 #if defined(__linux__) && defined(__NR_userfaultfd) && defined(CONFIG_EVENTFD)
  37 #include <sys/eventfd.h>
  38 #include <sys/ioctl.h>
  39 #include <linux/userfaultfd.h>
  40
  41 static bool ufd_version_check(void)
  42 {
  43     struct uffdio_api api_struct;
  44     uint64_t ioctl_mask;
  45
  46     int ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
  47
  48     if (ufd == -1) {
  49         g_test_message("Skipping test: userfaultfd not available");
  50         return false;
  51     }
  52
  53     api_struct.api = UFFD_API;
  54     api_struct.features = 0;
  55     if (ioctl(ufd, UFFDIO_API, &api_struct)) {
  56         g_test_message("Skipping test: UFFDIO_API failed");
  57         return false;
  58     }
  59     uffd_feature_thread_id = api_struct.features & UFFD_FEATURE_THREAD_ID;
  60
  61     ioctl_mask = (__u64)1 << _UFFDIO_REGISTER |
  62                  (__u64)1 << _UFFDIO_UNREGISTER;
  63     if ((api_struct.ioctls & ioctl_mask) != ioctl_mask) {
  64         g_test_message("Skipping test: Missing userfault feature");
  65         return false;
  66     }
  67
  68     return true;
  69 }
  70
  71 #else
  72 static bool ufd_version_check(void)
  73 {
  74     g_test_message("Skipping test: Userfault not available (builtdtime)");
  75     return false;
  76 }
  77
  78 #endif
  79
  80 static const char *tmpfs;
  81
  82 /* A simple PC boot sector that modifies memory (1-100MB) quickly
  83  * outputting a 'B' every so often if it's still running.
  84  */
  85 #include "tests/migration/x86-a-b-bootblock.h"
  86
  87 static void init_bootfile_x86(const char *bootpath)
  88 {
  89     FILE *bootfile = fopen(bootpath, "wb");
  90
  91     g_assert_cmpint(fwrite(x86_bootsect, 512, 1, bootfile), ==, 1);
  92     fclose(bootfile);
  93 }
  94
  95 /*
  96  * Wait for some output in the serial output file,
  97  * we get an 'A' followed by an endless string of 'B's
  98  * but on the destination we won't have the A.
  99  */
 100 static void wait_for_serial(const char *side)
 101 {
 102     char *serialpath = g_strdup_printf("%s/%s", tmpfs, side);
 103     FILE *serialfile = fopen(serialpath, "r");
 104     const char *arch = qtest_get_arch();
 105     int started = (strcmp(side, "src_serial") == 0 &&
 106                    strcmp(arch, "ppc64") == 0) ? 0 : 1;
 107
 108     g_free(serialpath);
 109     do {
 110         int readvalue = fgetc(serialfile);
 111
 112         if (!started) {
 113             /* SLOF prints its banner before starting test,
 114              * to ignore it, mark the start of the test with '_',
 115              * ignore all characters until this marker
 116              */
 117             switch (readvalue) {
 118             case '_':
 119                 started = 1;
 120                 break;
 121             case EOF:
 122                 fseek(serialfile, 0, SEEK_SET);
 123                 usleep(1000);
 124                 break;
 125             }
 126             continue;
 127         }
 128         switch (readvalue) {
 129         case 'A':
 130             /* Fine */
 131             break;
 132
 133         case 'B':
 134             /* It's alive! */
 135             fclose(serialfile);
 136             return;
 137
 138         case EOF:
 139             started = (strcmp(side, "src_serial") == 0 &&
 140                        strcmp(arch, "ppc64") == 0) ? 0 : 1;
 141             fseek(serialfile, 0, SEEK_SET);
 142             usleep(1000);
 143             break;
 144
 145         default:
 146             fprintf(stderr, "Unexpected %d on %s serial\n", readvalue, side);
 147             g_assert_not_reached();
 148         }
 149     } while (true);
 150 }
 151
 152 /*
 153  * Events can get in the way of responses we are actually waiting for.
 154  */
 155 static QDict *wait_command(QTestState *who, const char *command)
 156 {
 157     const char *event_string;
 158     QDict *response;
 159
 160     response = qtest_qmp(who, command);
 161
 162     while (qdict_haskey(response, "event")) {
 163         /* OK, it was an event */
 164         event_string = qdict_get_str(response, "event");
 165         if (!strcmp(event_string, "STOP")) {
 166             got_stop = true;
 167         }
 168         qobject_unref(response);
 169         response = qtest_qmp_receive(who);
 170     }
 171     return response;
 172 }
 173
 174 /*
 175  * Note: caller is responsible to free the returned object via
 176  * qobject_unref() after use
 177  */
 178 static QDict *migrate_query(QTestState *who)
 179 {
 180     QDict *rsp, *rsp_return;
 181
 182     rsp = wait_command(who, "{ 'execute': 'query-migrate' }");
 183     rsp_return = qdict_get_qdict(rsp, "return");
 184     g_assert(rsp_return);
 185     qobject_ref(rsp_return);
 186     qobject_unref(rsp);
 187
 188     return rsp_return;
 189 }
 190
 191 /*
 192  * Note: caller is responsible to free the returned object via
 193  * g_free() after use
 194  */
 195 static gchar *migrate_query_status(QTestState *who)
 196 {
 197     QDict *rsp_return = migrate_query(who);
 198     gchar *status = g_strdup(qdict_get_str(rsp_return, "status"));
 199
 200     g_assert(status);
 201     qobject_unref(rsp_return);
 202
 203     return status;
 204 }
 205
 206 /*
 207  * It's tricky to use qemu's migration event capability with qtest,
 208  * events suddenly appearing confuse the qmp()/hmp() responses.
 209  */
 210
 211 static uint64_t get_migration_pass(QTestState *who)
 212 {
 213     QDict *rsp_return, *rsp_ram;
 214     uint64_t result;
 215
 216     rsp_return = migrate_query(who);
 217     if (!qdict_haskey(rsp_return, "ram")) {
 218         /* Still in setup */
 219         result = 0;
 220     } else {
 221         rsp_ram = qdict_get_qdict(rsp_return, "ram");
 222         result = qdict_get_try_int(rsp_ram, "dirty-sync-count", 0);
 223     }
 224     qobject_unref(rsp_return);
 225     return result;
 226 }
 227
 228 static void read_blocktime(QTestState *who)
 229 {
 230     QDict *rsp_return;
 231
 232     rsp_return = migrate_query(who);
 233     g_assert(qdict_haskey(rsp_return, "postcopy-blocktime"));
 234     qobject_unref(rsp_return);
 235 }
 236
 237 static void wait_for_migration_status(QTestState *who,
 238                                       const char *goal)
 239 {
 240     while (true) {
 241         bool completed;
 242         char *status;
 243
 244         status = migrate_query_status(who);
 245         completed = strcmp(status, goal) == 0;
 246         g_assert_cmpstr(status, !=,  "failed");
 247         g_free(status);
 248         if (completed) {
 249             return;
 250         }
 251         usleep(1000);
 252     }
 253 }
 254
 255 static void wait_for_migration_complete(QTestState *who)
 256 {
 257     wait_for_migration_status(who, "completed");
 258 }
 259
 260 static void wait_for_migration_pass(QTestState *who)
 261 {
 262     uint64_t initial_pass = get_migration_pass(who);
 263     uint64_t pass;
 264
 265     /* Wait for the 1st sync */
 266     while (!got_stop && !initial_pass) {
 267         usleep(1000);
 268         initial_pass = get_migration_pass(who);
 269     }
 270
 271     do {
 272         usleep(1000);
 273         pass = get_migration_pass(who);
 274     } while (pass == initial_pass && !got_stop);
 275 }
 276
 277 static void check_guests_ram(QTestState *who)
 278 {
 279     /* Our ASM test will have been incrementing one byte from each page from
 280      * 1MB to <100MB in order.
 281      * This gives us a constraint that any page's byte should be equal or less
 282      * than the previous pages byte (mod 256); and they should all be equal
 283      * except for one transition at the point where we meet the incrementer.
 284      * (We're running this with the guest stopped).
 285      */
 286     unsigned address;
 287     uint8_t first_byte;
 288     uint8_t last_byte;
 289     bool hit_edge = false;
 290     bool bad = false;
 291
 292     qtest_memread(who, start_address, &first_byte, 1);
 293     last_byte = first_byte;
 294
 295     for (address = start_address + 4096; address < end_address; address += 4096)
 296     {
 297         uint8_t b;
 298         qtest_memread(who, address, &b, 1);
 299         if (b != last_byte) {
 300             if (((b + 1) % 256) == last_byte && !hit_edge) {
 301                 /* This is OK, the guest stopped at the point of
 302                  * incrementing the previous page but didn't get
 303                  * to us yet.
 304                  */
 305                 hit_edge = true;
 306                 last_byte = b;
 307             } else {
 308                 fprintf(stderr, "Memory content inconsistency at %x"
 309                                 " first_byte = %x last_byte = %x current = %x"
 310                                 " hit_edge = %x\n",
 311                                 address, first_byte, last_byte, b, hit_edge);
 312                 bad = true;
 313             }
 314         }
 315     }
 316     g_assert_false(bad);
 317 }
 318
 319 static void cleanup(const char *filename)
 320 {
 321     char *path = g_strdup_printf("%s/%s", tmpfs, filename);
 322
 323     unlink(path);
 324     g_free(path);
 325 }
 326
 327 static void migrate_check_parameter(QTestState *who, const char *parameter,
 328                                     const char *value)
 329 {
 330     QDict *rsp, *rsp_return;
 331     char *result;
 332
 333     rsp = wait_command(who, "{ 'execute': 'query-migrate-parameters' }");
 334     rsp_return = qdict_get_qdict(rsp, "return");
 335     result = g_strdup_printf("%" PRId64,
 336                              qdict_get_try_int(rsp_return,  parameter, -1));
 337     g_assert_cmpstr(result, ==, value);
 338     g_free(result);
 339     qobject_unref(rsp);
 340 }
 341
 342 static void migrate_set_parameter(QTestState *who, const char *parameter,
 343                                   const char *value)
 344 {
 345     QDict *rsp;
 346     gchar *cmd;
 347
 348     cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
 349                           "'arguments': { '%s': %s } }",
 350                           parameter, value);
 351     rsp = qtest_qmp(who, cmd);
 352     g_free(cmd);
 353     g_assert(qdict_haskey(rsp, "return"));
 354     qobject_unref(rsp);
 355     migrate_check_parameter(who, parameter, value);
 356 }
 357
 358 static void migrate_pause(QTestState *who)
 359 {
 360     QDict *rsp;
 361
 362     rsp = wait_command(who, "{ 'execute': 'migrate-pause' }");
 363     g_assert(qdict_haskey(rsp, "return"));
 364     qobject_unref(rsp);
 365 }
 366
 367 static void migrate_recover(QTestState *who, const char *uri)
 368 {
 369     QDict *rsp;
 370     gchar *cmd = g_strdup_printf(
 371         "{ 'execute': 'migrate-recover', "
 372         "  'id': 'recover-cmd', "
 373         "  'arguments': { 'uri': '%s' } }", uri);
 374
 375     rsp = wait_command(who, cmd);
 376     g_assert(qdict_haskey(rsp, "return"));
 377     g_free(cmd);
 378     qobject_unref(rsp);
 379 }
 380
 381 static void migrate_set_capability(QTestState *who, const char *capability,
 382                                    const char *value)
 383 {
 384     QDict *rsp;
 385     gchar *cmd;
 386
 387     cmd = g_strdup_printf("{ 'execute': 'migrate-set-capabilities',"
 388                           "'arguments': { "
 389                           "'capabilities': [ { "
 390                           "'capability': '%s', 'state': %s } ] } }",
 391                           capability, value);
 392     rsp = qtest_qmp(who, cmd);
 393     g_free(cmd);
 394     g_assert(qdict_haskey(rsp, "return"));
 395     qobject_unref(rsp);
 396 }
 397
 398 static void migrate(QTestState *who, const char *uri, const char *extra)
 399 {
 400     QDict *rsp;
 401     gchar *cmd;
 402
 403     cmd = g_strdup_printf("{ 'execute': 'migrate',"
 404                           "  'arguments': { 'uri': '%s' %s } }",
 405                           uri, extra ? extra : "");
 406     rsp = qtest_qmp(who, cmd);
 407     g_free(cmd);
 408     g_assert(qdict_haskey(rsp, "return"));
 409     qobject_unref(rsp);
 410 }
 411
 412 static void migrate_postcopy_start(QTestState *from, QTestState *to)
 413 {
 414     QDict *rsp;
 415
 416     rsp = wait_command(from, "{ 'execute': 'migrate-start-postcopy' }");
 417     g_assert(qdict_haskey(rsp, "return"));
 418     qobject_unref(rsp);
 419
 420     if (!got_stop) {
 421         qtest_qmp_eventwait(from, "STOP");
 422     }
 423
 424     qtest_qmp_eventwait(to, "RESUME");
 425 }
 426
 427 static int test_migrate_start(QTestState **from, QTestState **to,
 428                                const char *uri, bool hide_stderr)
 429 {
 430     gchar *cmd_src, *cmd_dst;
 431     char *bootpath = g_strdup_printf("%s/bootsect", tmpfs);
 432     const char *arch = qtest_get_arch();
 433     const char *accel = "kvm:tcg";
 434
 435     got_stop = false;
 436
 437     if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
 438         init_bootfile_x86(bootpath);
 439         cmd_src = g_strdup_printf("-machine accel=%s -m 150M"
 440                                   " -name source,debug-threads=on"
 441                                   " -serial file:%s/src_serial"
 442                                   " -drive file=%s,format=raw",
 443                                   accel, tmpfs, bootpath);
 444         cmd_dst = g_strdup_printf("-machine accel=%s -m 150M"
 445                                   " -name target,debug-threads=on"
 446                                   " -serial file:%s/dest_serial"
 447                                   " -drive file=%s,format=raw"
 448                                   " -incoming %s",
 449                                   accel, tmpfs, bootpath, uri);
 450     } else if (strcmp(arch, "ppc64") == 0) {
 451
 452         /* On ppc64, the test only works with kvm-hv, but not with kvm-pr
 453          * and TCG is touchy due to race conditions on dirty bits
 454          * (especially on PPC for some reason)
 455          */
 456         if (access("/sys/module/kvm_hv", F_OK)) {
 457             g_print("Skipping test: kvm_hv not available ");
 458             return -1;
 459         }
 460         cmd_src = g_strdup_printf("-machine accel=%s -m 256M"
 461                                   " -name source,debug-threads=on"
 462                                   " -serial file:%s/src_serial"
 463                                   " -prom-env '"
 464                                   "boot-command=hex .\" _\" begin %x %x "
 465                                   "do i c@ 1 + i c! 1000 +loop .\" B\" 0 "
 466                                   "until'",  accel, tmpfs, end_address,
 467                                   start_address);
 468         cmd_dst = g_strdup_printf("-machine accel=%s -m 256M"
 469                                   " -name target,debug-threads=on"
 470                                   " -serial file:%s/dest_serial"
 471                                   " -incoming %s",
 472                                   accel, tmpfs, uri);
 473     } else {
 474         g_assert_not_reached();
 475     }
 476
 477     g_free(bootpath);
 478
 479     if (hide_stderr) {
 480         gchar *tmp;
 481         tmp = g_strdup_printf("%s 2>/dev/null", cmd_src);
 482         g_free(cmd_src);
 483         cmd_src = tmp;
 484
 485         tmp = g_strdup_printf("%s 2>/dev/null", cmd_dst);
 486         g_free(cmd_dst);
 487         cmd_dst = tmp;
 488     }
 489
 490     *from = qtest_start(cmd_src);
 491     g_free(cmd_src);
 492
 493     *to = qtest_init(cmd_dst);
 494     g_free(cmd_dst);
 495     return 0;
 496 }
 497
 498 static void test_migrate_end(QTestState *from, QTestState *to, bool test_dest)
 499 {
 500     unsigned char dest_byte_a, dest_byte_b, dest_byte_c, dest_byte_d;
 501
 502     qtest_quit(from);
 503
 504     if (test_dest) {
 505         qtest_memread(to, start_address, &dest_byte_a, 1);
 506
 507         /* Destination still running, wait for a byte to change */
 508         do {
 509             qtest_memread(to, start_address, &dest_byte_b, 1);
 510             usleep(1000 * 10);
 511         } while (dest_byte_a == dest_byte_b);
 512
 513         qtest_qmp_discard_response(to, "{ 'execute' : 'stop'}");
 514
 515         /* With it stopped, check nothing changes */
 516         qtest_memread(to, start_address, &dest_byte_c, 1);
 517         usleep(1000 * 200);
 518         qtest_memread(to, start_address, &dest_byte_d, 1);
 519         g_assert_cmpint(dest_byte_c, ==, dest_byte_d);
 520
 521         check_guests_ram(to);
 522     }
 523
 524     qtest_quit(to);
 525
 526     cleanup("bootsect");
 527     cleanup("migsocket");
 528     cleanup("src_serial");
 529     cleanup("dest_serial");
 530 }
 531
 532 static void deprecated_set_downtime(QTestState *who, const double value)
 533 {
 534     QDict *rsp;
 535     char *expected;
 536     int64_t result_int;
 537
 538     rsp = qtest_qmp(who,
 539                     "{ 'execute': 'migrate_set_downtime',"
 540                     " 'arguments': { 'value': %f } }", value);
 541     g_assert(qdict_haskey(rsp, "return"));
 542     qobject_unref(rsp);
 543     result_int = value * 1000L;
 544     expected = g_strdup_printf("%" PRId64, result_int);
 545     migrate_check_parameter(who, "downtime-limit", expected);
 546     g_free(expected);
 547 }
 548
 549 static void deprecated_set_speed(QTestState *who, const char *value)
 550 {
 551     QDict *rsp;
 552     gchar *cmd;
 553
 554     cmd = g_strdup_printf("{ 'execute': 'migrate_set_speed',"
 555                           "'arguments': { 'value': %s } }", value);
 556     rsp = qtest_qmp(who, cmd);
 557     g_free(cmd);
 558     g_assert(qdict_haskey(rsp, "return"));
 559     qobject_unref(rsp);
 560     migrate_check_parameter(who, "max-bandwidth", value);
 561 }
 562
 563 static void test_deprecated(void)
 564 {
 565     QTestState *from;
 566
 567     from = qtest_start("");
 568
 569     deprecated_set_downtime(from, 0.12345);
 570     deprecated_set_speed(from, "12345");
 571
 572     qtest_quit(from);
 573 }
 574
 575 static int migrate_postcopy_prepare(QTestState **from_ptr,
 576                                      QTestState **to_ptr,
 577                                      bool hide_error)
 578 {
 579     char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
 580     QTestState *from, *to;
 581
 582     if (test_migrate_start(&from, &to, uri, hide_error)) {
 583         return -1;
 584     }
 585
 586     migrate_set_capability(from, "postcopy-ram", "true");
 587     migrate_set_capability(to, "postcopy-ram", "true");
 588     migrate_set_capability(to, "postcopy-blocktime", "true");
 589
 590     /* We want to pick a speed slow enough that the test completes
 591      * quickly, but that it doesn't complete precopy even on a slow
 592      * machine, so also set the downtime.
 593      */
 594     migrate_set_parameter(from, "max-bandwidth", "100000000");
 595     migrate_set_parameter(from, "downtime-limit", "1");
 596
 597     /* Wait for the first serial output from the source */
 598     wait_for_serial("src_serial");
 599
 600     migrate(from, uri, NULL);
 601     g_free(uri);
 602
 603     wait_for_migration_pass(from);
 604
 605     *from_ptr = from;
 606     *to_ptr = to;
 607
 608     return 0;
 609 }
 610
 611 static void migrate_postcopy_complete(QTestState *from, QTestState *to)
 612 {
 613     wait_for_migration_complete(from);
 614
 615     /* Make sure we get at least one "B" on destination */
 616     wait_for_serial("dest_serial");
 617
 618     if (uffd_feature_thread_id) {
 619         read_blocktime(to);
 620     }
 621
 622     test_migrate_end(from, to, true);
 623 }
 624
 625 static void test_postcopy(void)
 626 {
 627     QTestState *from, *to;
 628
 629     if (migrate_postcopy_prepare(&from, &to, false)) {
 630         return;
 631     }
 632     migrate_postcopy_start(from, to);
 633     migrate_postcopy_complete(from, to);
 634 }
 635
 636 static void test_postcopy_recovery(void)
 637 {
 638     QTestState *from, *to;
 639     char *uri;
 640
 641     if (migrate_postcopy_prepare(&from, &to, true)) {
 642         return;
 643     }
 644
 645     /* Turn postcopy speed down, 4K/s is slow enough on any machines */
 646     migrate_set_parameter(from, "max-postcopy-bandwidth", "4096");
 647
 648     /* Now we start the postcopy */
 649     migrate_postcopy_start(from, to);
 650
 651     /*
 652      * Wait until postcopy is really started; we can only run the
 653      * migrate-pause command during a postcopy
 654      */
 655     wait_for_migration_status(from, "postcopy-active");
 656
 657     /*
 658      * Manually stop the postcopy migration. This emulates a network
 659      * failure with the migration socket
 660      */
 661     migrate_pause(from);
 662
 663     /*
 664      * Wait for destination side to reach postcopy-paused state.  The
 665      * migrate-recover command can only succeed if destination machine
 666      * is in the paused state
 667      */
 668     wait_for_migration_status(to, "postcopy-paused");
 669
 670     /*
 671      * Create a new socket to emulate a new channel that is different
 672      * from the broken migration channel; tell the destination to
 673      * listen to the new port
 674      */
 675     uri = g_strdup_printf("unix:%s/migsocket-recover", tmpfs);
 676     migrate_recover(to, uri);
 677
 678     /*
 679      * Try to rebuild the migration channel using the resume flag and
 680      * the newly created channel
 681      */
 682     wait_for_migration_status(from, "postcopy-paused");
 683     migrate(from, uri, ", 'resume': true");
 684     g_free(uri);
 685
 686     /* Restore the postcopy bandwidth to unlimited */
 687     migrate_set_parameter(from, "max-postcopy-bandwidth", "0");
 688
 689     migrate_postcopy_complete(from, to);
 690 }
 691
 692 static void test_baddest(void)
 693 {
 694     QTestState *from, *to;
 695     QDict *rsp, *rsp_return;
 696     char *status;
 697     bool failed;
 698
 699     if (test_migrate_start(&from, &to, "tcp:0:0", true)) {
 700         return;
 701     }
 702     migrate(from, "tcp:0:0", NULL);
 703     do {
 704         status = migrate_query_status(from);
 705         g_assert(!strcmp(status, "setup") || !(strcmp(status, "failed")));
 706         failed = !strcmp(status, "failed");
 707         g_free(status);
 708     } while (!failed);
 709
 710     /* Is the machine currently running? */
 711     rsp = wait_command(from, "{ 'execute': 'query-status' }");
 712     g_assert(qdict_haskey(rsp, "return"));
 713     rsp_return = qdict_get_qdict(rsp, "return");
 714     g_assert(qdict_haskey(rsp_return, "running"));
 715     g_assert(qdict_get_bool(rsp_return, "running"));
 716     qobject_unref(rsp);
 717
 718     test_migrate_end(from, to, false);
 719 }
 720
 721 static void test_precopy_unix(void)
 722 {
 723     char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
 724     QTestState *from, *to;
 725
 726     if (test_migrate_start(&from, &to, uri, false)) {
 727         return;
 728     }
 729
 730     /* We want to pick a speed slow enough that the test completes
 731      * quickly, but that it doesn't complete precopy even on a slow
 732      * machine, so also set the downtime.
 733      */
 734     /* 1 ms should make it not converge*/
 735     migrate_set_parameter(from, "downtime-limit", "1");
 736     /* 1GB/s */
 737     migrate_set_parameter(from, "max-bandwidth", "1000000000");
 738
 739     /* Wait for the first serial output from the source */
 740     wait_for_serial("src_serial");
 741
 742     migrate(from, uri, NULL);
 743
 744     wait_for_migration_pass(from);
 745
 746     /* 300 ms should converge */
 747     migrate_set_parameter(from, "downtime-limit", "300");
 748
 749     if (!got_stop) {
 750         qtest_qmp_eventwait(from, "STOP");
 751     }
 752
 753     qtest_qmp_eventwait(to, "RESUME");
 754
 755     wait_for_serial("dest_serial");
 756     wait_for_migration_complete(from);
 757
 758     test_migrate_end(from, to, true);
 759     g_free(uri);
 760 }
 761
 762 int main(int argc, char **argv)
 763 {
 764     char template[] = "/tmp/migration-test-XXXXXX";
 765     int ret;
 766
 767     g_test_init(&argc, &argv, NULL);
 768
 769     if (!ufd_version_check()) {
 770         return 0;
 771     }
 772
 773     tmpfs = mkdtemp(template);
 774     if (!tmpfs) {
 775         g_test_message("mkdtemp on path (%s): %s\n", template, strerror(errno));
 776     }
 777     g_assert(tmpfs);
 778
 779     module_call_init(MODULE_INIT_QOM);
 780
 781     qtest_add_func("/migration/postcopy/unix", test_postcopy);
 782     qtest_add_func("/migration/postcopy/recovery", test_postcopy_recovery);
 783     qtest_add_func("/migration/deprecated", test_deprecated);
 784     qtest_add_func("/migration/bad_dest", test_baddest);
 785     qtest_add_func("/migration/precopy/unix", test_precopy_unix);
 786
 787     ret = g_test_run();
 788
 789     g_assert_cmpint(ret, ==, 0);
 790
 791     ret = rmdir(tmpfs);
 792     if (ret != 0) {
 793         g_test_message("unable to rmdir: path (%s): %s\n",
 794                        tmpfs, strerror(errno));
 795     }
 796
 797     return ret;
 798 }