tests/migration-test.c

   1 /*
   2  * QTest testcase for migration
   3  *
   4  * Copyright (c) 2016 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 "qemu/option.h"
  17 #include "qemu/range.h"
  18 #include "qemu/sockets.h"
  19 #include "chardev/char.h"
  20 #include "sysemu/sysemu.h"
  21 #include "hw/nvram/chrp_nvram.h"
  22
  23 #define MIN_NVRAM_SIZE 8192 /* from spapr_nvram.c */
  24
  25 const unsigned start_address = 1024 * 1024;
  26 const unsigned end_address = 100 * 1024 * 1024;
  27 bool got_stop;
  28
  29 #if defined(__linux__)
  30 #include <sys/syscall.h>
  31 #include <sys/vfs.h>
  32 #endif
  33
  34 #if defined(__linux__) && defined(__NR_userfaultfd) && defined(CONFIG_EVENTFD)
  35 #include <sys/eventfd.h>
  36 #include <sys/ioctl.h>
  37 #include <linux/userfaultfd.h>
  38
  39 static bool ufd_version_check(void)
  40 {
  41     struct uffdio_api api_struct;
  42     uint64_t ioctl_mask;
  43
  44     int ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
  45
  46     if (ufd == -1) {
  47         g_test_message("Skipping test: userfaultfd not available");
  48         return false;
  49     }
  50
  51     api_struct.api = UFFD_API;
  52     api_struct.features = 0;
  53     if (ioctl(ufd, UFFDIO_API, &api_struct)) {
  54         g_test_message("Skipping test: UFFDIO_API failed");
  55         return false;
  56     }
  57
  58     ioctl_mask = (__u64)1 << _UFFDIO_REGISTER |
  59                  (__u64)1 << _UFFDIO_UNREGISTER;
  60     if ((api_struct.ioctls & ioctl_mask) != ioctl_mask) {
  61         g_test_message("Skipping test: Missing userfault feature");
  62         return false;
  63     }
  64
  65     return true;
  66 }
  67
  68 #else
  69 static bool ufd_version_check(void)
  70 {
  71     g_test_message("Skipping test: Userfault not available (builtdtime)");
  72     return false;
  73 }
  74
  75 #endif
  76
  77 static const char *tmpfs;
  78
  79 /* A simple PC boot sector that modifies memory (1-100MB) quickly
  80  * outputing a 'B' every so often if it's still running.
  81  */
  82 unsigned char bootsect[] = {
  83   0xfa, 0x0f, 0x01, 0x16, 0x74, 0x7c, 0x66, 0xb8, 0x01, 0x00, 0x00, 0x00,
  84   0x0f, 0x22, 0xc0, 0x66, 0xea, 0x20, 0x7c, 0x00, 0x00, 0x08, 0x00, 0x00,
  85   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe4, 0x92, 0x0c, 0x02,
  86   0xe6, 0x92, 0xb8, 0x10, 0x00, 0x00, 0x00, 0x8e, 0xd8, 0x66, 0xb8, 0x41,
  87   0x00, 0x66, 0xba, 0xf8, 0x03, 0xee, 0xb3, 0x00, 0xb8, 0x00, 0x00, 0x10,
  88   0x00, 0xfe, 0x00, 0x05, 0x00, 0x10, 0x00, 0x00, 0x3d, 0x00, 0x00, 0x40,
  89   0x06, 0x7c, 0xf2, 0xfe, 0xc3, 0x75, 0xe9, 0x66, 0xb8, 0x42, 0x00, 0x66,
  90   0xba, 0xf8, 0x03, 0xee, 0xeb, 0xde, 0x66, 0x90, 0x00, 0x00, 0x00, 0x00,
  91   0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00,
  92   0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00, 0x27, 0x00, 0x5c, 0x7c,
  93   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  94   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  95   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  96   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  97   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  98   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  99   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 100   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 101   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 102   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 103   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 104   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 105   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 106   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 107   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 108   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 109   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 110   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 111   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 112   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 113   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 114   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 115   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 116   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 117   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 118   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 119   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 120   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 121   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 122   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 123   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 124   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 125   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xaa
 126 };
 127
 128 static void init_bootfile_x86(const char *bootpath)
 129 {
 130     FILE *bootfile = fopen(bootpath, "wb");
 131
 132     g_assert_cmpint(fwrite(bootsect, 512, 1, bootfile), ==, 1);
 133     fclose(bootfile);
 134 }
 135
 136 static void init_bootfile_ppc(const char *bootpath)
 137 {
 138     FILE *bootfile;
 139     char buf[MIN_NVRAM_SIZE];
 140     ChrpNvramPartHdr *header = (ChrpNvramPartHdr *)buf;
 141
 142     memset(buf, 0, MIN_NVRAM_SIZE);
 143
 144     /* Create a "common" partition in nvram to store boot-command property */
 145
 146     header->signature = CHRP_NVPART_SYSTEM;
 147     memcpy(header->name, "common", 6);
 148     chrp_nvram_finish_partition(header, MIN_NVRAM_SIZE);
 149
 150     /* FW_MAX_SIZE is 4MB, but slof.bin is only 900KB,
 151      * so let's modify memory between 1MB and 100MB
 152      * to do like PC bootsector
 153      */
 154
 155     sprintf(buf + 16,
 156             "boot-command=hex .\" _\" begin %x %x do i c@ 1 + i c! 1000 +loop "
 157             ".\" B\" 0 until", end_address, start_address);
 158
 159     /* Write partition to the NVRAM file */
 160
 161     bootfile = fopen(bootpath, "wb");
 162     g_assert_cmpint(fwrite(buf, MIN_NVRAM_SIZE, 1, bootfile), ==, 1);
 163     fclose(bootfile);
 164 }
 165
 166 /*
 167  * Wait for some output in the serial output file,
 168  * we get an 'A' followed by an endless string of 'B's
 169  * but on the destination we won't have the A.
 170  */
 171 static void wait_for_serial(const char *side)
 172 {
 173     char *serialpath = g_strdup_printf("%s/%s", tmpfs, side);
 174     FILE *serialfile = fopen(serialpath, "r");
 175     const char *arch = qtest_get_arch();
 176     int started = (strcmp(side, "src_serial") == 0 &&
 177                    strcmp(arch, "ppc64") == 0) ? 0 : 1;
 178
 179     g_free(serialpath);
 180     do {
 181         int readvalue = fgetc(serialfile);
 182
 183         if (!started) {
 184             /* SLOF prints its banner before starting test,
 185              * to ignore it, mark the start of the test with '_',
 186              * ignore all characters until this marker
 187              */
 188             switch (readvalue) {
 189             case '_':
 190                 started = 1;
 191                 break;
 192             case EOF:
 193                 fseek(serialfile, 0, SEEK_SET);
 194                 usleep(1000);
 195                 break;
 196             }
 197             continue;
 198         }
 199         switch (readvalue) {
 200         case 'A':
 201             /* Fine */
 202             break;
 203
 204         case 'B':
 205             /* It's alive! */
 206             fclose(serialfile);
 207             return;
 208
 209         case EOF:
 210             started = (strcmp(side, "src_serial") == 0 &&
 211                        strcmp(arch, "ppc64") == 0) ? 0 : 1;
 212             fseek(serialfile, 0, SEEK_SET);
 213             usleep(1000);
 214             break;
 215
 216         default:
 217             fprintf(stderr, "Unexpected %d on %s serial\n", readvalue, side);
 218             g_assert_not_reached();
 219         }
 220     } while (true);
 221 }
 222
 223 /*
 224  * Events can get in the way of responses we are actually waiting for.
 225  */
 226 static QDict *wait_command(QTestState *who, const char *command)
 227 {
 228     const char *event_string;
 229     QDict *response;
 230
 231     response = qtest_qmp(who, command);
 232
 233     while (qdict_haskey(response, "event")) {
 234         /* OK, it was an event */
 235         event_string = qdict_get_str(response, "event");
 236         if (!strcmp(event_string, "STOP")) {
 237             got_stop = true;
 238         }
 239         QDECREF(response);
 240         response = qtest_qmp_receive(who);
 241     }
 242     return response;
 243 }
 244
 245
 246 /*
 247  * It's tricky to use qemu's migration event capability with qtest,
 248  * events suddenly appearing confuse the qmp()/hmp() responses.
 249  */
 250
 251 static uint64_t get_migration_pass(QTestState *who)
 252 {
 253     QDict *rsp, *rsp_return, *rsp_ram;
 254     uint64_t result;
 255
 256     rsp = wait_command(who, "{ 'execute': 'query-migrate' }");
 257     rsp_return = qdict_get_qdict(rsp, "return");
 258     if (!qdict_haskey(rsp_return, "ram")) {
 259         /* Still in setup */
 260         result = 0;
 261     } else {
 262         rsp_ram = qdict_get_qdict(rsp_return, "ram");
 263         result = qdict_get_try_int(rsp_ram, "dirty-sync-count", 0);
 264     }
 265     QDECREF(rsp);
 266     return result;
 267 }
 268
 269 static void wait_for_migration_complete(QTestState *who)
 270 {
 271     QDict *rsp, *rsp_return;
 272     bool completed;
 273
 274     do {
 275         const char *status;
 276
 277         rsp = wait_command(who, "{ 'execute': 'query-migrate' }");
 278         rsp_return = qdict_get_qdict(rsp, "return");
 279         status = qdict_get_str(rsp_return, "status");
 280         completed = strcmp(status, "completed") == 0;
 281         g_assert_cmpstr(status, !=,  "failed");
 282         QDECREF(rsp);
 283         usleep(1000 * 100);
 284     } while (!completed);
 285 }
 286
 287 static void wait_for_migration_pass(QTestState *who)
 288 {
 289     uint64_t initial_pass = get_migration_pass(who);
 290     uint64_t pass;
 291
 292     /* Wait for the 1st sync */
 293     do {
 294         initial_pass = get_migration_pass(who);
 295         if (got_stop || initial_pass) {
 296             break;
 297         }
 298         usleep(1000 * 100);
 299     } while (true);
 300
 301     do {
 302         usleep(1000 * 100);
 303         pass = get_migration_pass(who);
 304     } while (pass == initial_pass && !got_stop);
 305 }
 306
 307 static void check_guests_ram(QTestState *who)
 308 {
 309     /* Our ASM test will have been incrementing one byte from each page from
 310      * 1MB to <100MB in order.
 311      * This gives us a constraint that any page's byte should be equal or less
 312      * than the previous pages byte (mod 256); and they should all be equal
 313      * except for one transition at the point where we meet the incrementer.
 314      * (We're running this with the guest stopped).
 315      */
 316     unsigned address;
 317     uint8_t first_byte;
 318     uint8_t last_byte;
 319     bool hit_edge = false;
 320     bool bad = false;
 321
 322     qtest_memread(who, start_address, &first_byte, 1);
 323     last_byte = first_byte;
 324
 325     for (address = start_address + 4096; address < end_address; address += 4096)
 326     {
 327         uint8_t b;
 328         qtest_memread(who, address, &b, 1);
 329         if (b != last_byte) {
 330             if (((b + 1) % 256) == last_byte && !hit_edge) {
 331                 /* This is OK, the guest stopped at the point of
 332                  * incrementing the previous page but didn't get
 333                  * to us yet.
 334                  */
 335                 hit_edge = true;
 336             } else {
 337                 fprintf(stderr, "Memory content inconsistency at %x"
 338                                 " first_byte = %x last_byte = %x current = %x"
 339                                 " hit_edge = %x\n",
 340                                 address, first_byte, last_byte, b, hit_edge);
 341                 bad = true;
 342             }
 343         }
 344         last_byte = b;
 345     }
 346     g_assert_false(bad);
 347 }
 348
 349 static void cleanup(const char *filename)
 350 {
 351     char *path = g_strdup_printf("%s/%s", tmpfs, filename);
 352
 353     unlink(path);
 354     g_free(path);
 355 }
 356
 357 static void migrate_check_parameter(QTestState *who, const char *parameter,
 358                                     const char *value)
 359 {
 360     QDict *rsp, *rsp_return;
 361     char *result;
 362
 363     rsp = wait_command(who, "{ 'execute': 'query-migrate-parameters' }");
 364     rsp_return = qdict_get_qdict(rsp, "return");
 365     result = g_strdup_printf("%" PRId64,
 366                              qdict_get_try_int(rsp_return,  parameter, -1));
 367     g_assert_cmpstr(result, ==, value);
 368     g_free(result);
 369     QDECREF(rsp);
 370 }
 371
 372 static void migrate_set_parameter(QTestState *who, const char *parameter,
 373                                   const char *value)
 374 {
 375     QDict *rsp;
 376     gchar *cmd;
 377
 378     cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
 379                           "'arguments': { '%s': %s } }",
 380                           parameter, value);
 381     rsp = qtest_qmp(who, cmd);
 382     g_free(cmd);
 383     g_assert(qdict_haskey(rsp, "return"));
 384     QDECREF(rsp);
 385     migrate_check_parameter(who, parameter, value);
 386 }
 387
 388 static void migrate_set_capability(QTestState *who, const char *capability,
 389                                    const char *value)
 390 {
 391     QDict *rsp;
 392     gchar *cmd;
 393
 394     cmd = g_strdup_printf("{ 'execute': 'migrate-set-capabilities',"
 395                           "'arguments': { "
 396                           "'capabilities': [ { "
 397                           "'capability': '%s', 'state': %s } ] } }",
 398                           capability, value);
 399     rsp = qtest_qmp(who, cmd);
 400     g_free(cmd);
 401     g_assert(qdict_haskey(rsp, "return"));
 402     QDECREF(rsp);
 403 }
 404
 405 static void migrate(QTestState *who, const char *uri)
 406 {
 407     QDict *rsp;
 408     gchar *cmd;
 409
 410     cmd = g_strdup_printf("{ 'execute': 'migrate',"
 411                           "'arguments': { 'uri': '%s' } }",
 412                           uri);
 413     rsp = qtest_qmp(who, cmd);
 414     g_free(cmd);
 415     g_assert(qdict_haskey(rsp, "return"));
 416     QDECREF(rsp);
 417 }
 418
 419 static void test_migrate_start(QTestState **from, QTestState **to,
 420                                const char *uri)
 421 {
 422     gchar *cmd_src, *cmd_dst;
 423     char *bootpath = g_strdup_printf("%s/bootsect", tmpfs);
 424     const char *arch = qtest_get_arch();
 425
 426     got_stop = false;
 427
 428     if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
 429         init_bootfile_x86(bootpath);
 430         cmd_src = g_strdup_printf("-machine accel=kvm:tcg -m 150M"
 431                                   " -name pcsource,debug-threads=on"
 432                                   " -serial file:%s/src_serial"
 433                                   " -drive file=%s,format=raw",
 434                                   tmpfs, bootpath);
 435         cmd_dst = g_strdup_printf("-machine accel=kvm:tcg -m 150M"
 436                                   " -name pcdest,debug-threads=on"
 437                                   " -serial file:%s/dest_serial"
 438                                   " -drive file=%s,format=raw"
 439                                   " -incoming %s",
 440                                   tmpfs, bootpath, uri);
 441     } else if (strcmp(arch, "ppc64") == 0) {
 442         const char *accel;
 443
 444         /* On ppc64, the test only works with kvm-hv, but not with kvm-pr */
 445         accel = access("/sys/module/kvm_hv", F_OK) ? "tcg" : "kvm:tcg";
 446         init_bootfile_ppc(bootpath);
 447         cmd_src = g_strdup_printf("-machine accel=%s -m 256M"
 448                                   " -name pcsource,debug-threads=on"
 449                                   " -serial file:%s/src_serial"
 450                                   " -drive file=%s,if=pflash,format=raw",
 451                                   accel, tmpfs, bootpath);
 452         cmd_dst = g_strdup_printf("-machine accel=%s -m 256M"
 453                                   " -name pcdest,debug-threads=on"
 454                                   " -serial file:%s/dest_serial"
 455                                   " -incoming %s",
 456                                   accel, tmpfs, uri);
 457     } else {
 458         g_assert_not_reached();
 459     }
 460
 461     g_free(bootpath);
 462
 463     *from = qtest_start(cmd_src);
 464     g_free(cmd_src);
 465
 466     *to = qtest_init(cmd_dst);
 467     g_free(cmd_dst);
 468 }
 469
 470 static void test_migrate_end(QTestState *from, QTestState *to)
 471 {
 472     unsigned char dest_byte_a, dest_byte_b, dest_byte_c, dest_byte_d;
 473
 474     qtest_quit(from);
 475
 476     qtest_memread(to, start_address, &dest_byte_a, 1);
 477
 478     /* Destination still running, wait for a byte to change */
 479     do {
 480         qtest_memread(to, start_address, &dest_byte_b, 1);
 481         usleep(10 * 1000);
 482     } while (dest_byte_a == dest_byte_b);
 483
 484     qtest_qmp_discard_response(to, "{ 'execute' : 'stop'}");
 485     /* With it stopped, check nothing changes */
 486     qtest_memread(to, start_address, &dest_byte_c, 1);
 487     sleep(1);
 488     qtest_memread(to, start_address, &dest_byte_d, 1);
 489     g_assert_cmpint(dest_byte_c, ==, dest_byte_d);
 490
 491     check_guests_ram(to);
 492
 493     qtest_quit(to);
 494
 495     cleanup("bootsect");
 496     cleanup("migsocket");
 497     cleanup("src_serial");
 498     cleanup("dest_serial");
 499 }
 500
 501 static void test_migrate(void)
 502 {
 503     char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
 504     QTestState *from, *to;
 505     QDict *rsp;
 506
 507     test_migrate_start(&from, &to, uri);
 508
 509     migrate_set_capability(from, "postcopy-ram", "true");
 510     migrate_set_capability(to, "postcopy-ram", "true");
 511
 512     /* We want to pick a speed slow enough that the test completes
 513      * quickly, but that it doesn't complete precopy even on a slow
 514      * machine, so also set the downtime.
 515      */
 516     migrate_set_parameter(from, "max-bandwidth", "100000000");
 517     migrate_set_parameter(from, "downtime-limit", "1");
 518
 519     /* Wait for the first serial output from the source */
 520     wait_for_serial("src_serial");
 521
 522     migrate(from, uri);
 523
 524     wait_for_migration_pass(from);
 525
 526     rsp = wait_command(from, "{ 'execute': 'migrate-start-postcopy' }");
 527     g_assert(qdict_haskey(rsp, "return"));
 528     QDECREF(rsp);
 529
 530     if (!got_stop) {
 531         qtest_qmp_eventwait(from, "STOP");
 532     }
 533
 534     qtest_qmp_eventwait(to, "RESUME");
 535
 536     wait_for_serial("dest_serial");
 537     wait_for_migration_complete(from);
 538
 539     g_free(uri);
 540
 541     test_migrate_end(from, to);
 542 }
 543
 544 int main(int argc, char **argv)
 545 {
 546     char template[] = "/tmp/migration-test-XXXXXX";
 547     int ret;
 548
 549     g_test_init(&argc, &argv, NULL);
 550
 551     if (!ufd_version_check()) {
 552         return 0;
 553     }
 554
 555     tmpfs = mkdtemp(template);
 556     if (!tmpfs) {
 557         g_test_message("mkdtemp on path (%s): %s\n", template, strerror(errno));
 558     }
 559     g_assert(tmpfs);
 560
 561     module_call_init(MODULE_INIT_QOM);
 562
 563     qtest_add_func("/migration/postcopy/unix", test_migrate);
 564
 565     ret = g_test_run();
 566
 567     g_assert_cmpint(ret, ==, 0);
 568
 569     ret = rmdir(tmpfs);
 570     if (ret != 0) {
 571         g_test_message("unable to rmdir: path (%s): %s\n",
 572                        tmpfs, strerror(errno));
 573     }
 574
 575     return ret;
 576 }