tests/vhost-user-test.c

   1 /*
   2  * QTest testcase for the vhost-user
   3  *
   4  * Copyright (c) 2014 Virtual Open Systems Sarl.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  *
   9  */
  10
  11 #include "qemu/osdep.h"
  12
  13 #include "libqtest.h"
  14 #include "qemu/option.h"
  15 #include "qemu/range.h"
  16 #include "sysemu/char.h"
  17 #include "sysemu/sysemu.h"
  18
  19 #include <linux/vhost.h>
  20 #include <sys/mman.h>
  21 #include <sys/vfs.h>
  22 #include <qemu/sockets.h>
  23
  24 /* GLIB version compatibility flags */
  25 #if !GLIB_CHECK_VERSION(2, 26, 0)
  26 #define G_TIME_SPAN_SECOND              (G_GINT64_CONSTANT(1000000))
  27 #endif
  28
  29 #if GLIB_CHECK_VERSION(2, 28, 0)
  30 #define HAVE_MONOTONIC_TIME
  31 #endif
  32
  33 #define QEMU_CMD_ACCEL  " -machine accel=tcg"
  34 #define QEMU_CMD_MEM    " -m %d -object memory-backend-file,id=mem,size=%dM,"\
  35                         "mem-path=%s,share=on -numa node,memdev=mem"
  36 #define QEMU_CMD_CHR    " -chardev socket,id=%s,path=%s"
  37 #define QEMU_CMD_NETDEV " -netdev vhost-user,id=net0,chardev=%s,vhostforce"
  38 #define QEMU_CMD_NET    " -device virtio-net-pci,netdev=net0,romfile=./pc-bios/pxe-virtio.rom"
  39
  40 #define QEMU_CMD        QEMU_CMD_ACCEL QEMU_CMD_MEM QEMU_CMD_CHR \
  41                         QEMU_CMD_NETDEV QEMU_CMD_NET
  42
  43 #define HUGETLBFS_MAGIC       0x958458f6
  44
  45 /*********** FROM hw/virtio/vhost-user.c *************************************/
  46
  47 #define VHOST_MEMORY_MAX_NREGIONS    8
  48
  49 #define VHOST_USER_F_PROTOCOL_FEATURES 30
  50 #define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1
  51
  52 #define VHOST_LOG_PAGE 0x1000
  53
  54 typedef enum VhostUserRequest {
  55     VHOST_USER_NONE = 0,
  56     VHOST_USER_GET_FEATURES = 1,
  57     VHOST_USER_SET_FEATURES = 2,
  58     VHOST_USER_SET_OWNER = 3,
  59     VHOST_USER_RESET_OWNER = 4,
  60     VHOST_USER_SET_MEM_TABLE = 5,
  61     VHOST_USER_SET_LOG_BASE = 6,
  62     VHOST_USER_SET_LOG_FD = 7,
  63     VHOST_USER_SET_VRING_NUM = 8,
  64     VHOST_USER_SET_VRING_ADDR = 9,
  65     VHOST_USER_SET_VRING_BASE = 10,
  66     VHOST_USER_GET_VRING_BASE = 11,
  67     VHOST_USER_SET_VRING_KICK = 12,
  68     VHOST_USER_SET_VRING_CALL = 13,
  69     VHOST_USER_SET_VRING_ERR = 14,
  70     VHOST_USER_GET_PROTOCOL_FEATURES = 15,
  71     VHOST_USER_SET_PROTOCOL_FEATURES = 16,
  72     VHOST_USER_SET_VRING_ENABLE = 18,
  73     VHOST_USER_MAX
  74 } VhostUserRequest;
  75
  76 typedef struct VhostUserMemoryRegion {
  77     uint64_t guest_phys_addr;
  78     uint64_t memory_size;
  79     uint64_t userspace_addr;
  80     uint64_t mmap_offset;
  81 } VhostUserMemoryRegion;
  82
  83 typedef struct VhostUserMemory {
  84     uint32_t nregions;
  85     uint32_t padding;
  86     VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
  87 } VhostUserMemory;
  88
  89 typedef struct VhostUserLog {
  90     uint64_t mmap_size;
  91     uint64_t mmap_offset;
  92 } VhostUserLog;
  93
  94 typedef struct VhostUserMsg {
  95     VhostUserRequest request;
  96
  97 #define VHOST_USER_VERSION_MASK     (0x3)
  98 #define VHOST_USER_REPLY_MASK       (0x1<<2)
  99     uint32_t flags;
 100     uint32_t size; /* the following payload size */
 101     union {
 102 #define VHOST_USER_VRING_IDX_MASK   (0xff)
 103 #define VHOST_USER_VRING_NOFD_MASK  (0x1<<8)
 104         uint64_t u64;
 105         struct vhost_vring_state state;
 106         struct vhost_vring_addr addr;
 107         VhostUserMemory memory;
 108         VhostUserLog log;
 109     } payload;
 110 } QEMU_PACKED VhostUserMsg;
 111
 112 static VhostUserMsg m __attribute__ ((unused));
 113 #define VHOST_USER_HDR_SIZE (sizeof(m.request) \
 114                             + sizeof(m.flags) \
 115                             + sizeof(m.size))
 116
 117 #define VHOST_USER_PAYLOAD_SIZE (sizeof(m) - VHOST_USER_HDR_SIZE)
 118
 119 /* The version of the protocol we support */
 120 #define VHOST_USER_VERSION    (0x1)
 121 /*****************************************************************************/
 122
 123 typedef struct TestServer {
 124     gchar *socket_path;
 125     gchar *mig_path;
 126     gchar *chr_name;
 127     CharDriverState *chr;
 128     int fds_num;
 129     int fds[VHOST_MEMORY_MAX_NREGIONS];
 130     VhostUserMemory memory;
 131     GMutex data_mutex;
 132     GCond data_cond;
 133     int log_fd;
 134     uint64_t rings;
 135 } TestServer;
 136
 137 #if !GLIB_CHECK_VERSION(2, 32, 0)
 138 static gboolean g_cond_wait_until(CompatGCond cond, CompatGMutex mutex,
 139                                   gint64 end_time)
 140 {
 141     gboolean ret = FALSE;
 142     end_time -= g_get_monotonic_time();
 143     GTimeVal time = { end_time / G_TIME_SPAN_SECOND,
 144                       end_time % G_TIME_SPAN_SECOND };
 145     ret = g_cond_timed_wait(cond, mutex, &time);
 146     return ret;
 147 }
 148 #endif
 149
 150 static const char *tmpfs;
 151 static const char *root;
 152
 153 static void wait_for_fds(TestServer *s)
 154 {
 155     gint64 end_time;
 156
 157     g_mutex_lock(&s->data_mutex);
 158
 159     end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
 160     while (!s->fds_num) {
 161         if (!g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
 162             /* timeout has passed */
 163             g_assert(s->fds_num);
 164             break;
 165         }
 166     }
 167
 168     /* check for sanity */
 169     g_assert_cmpint(s->fds_num, >, 0);
 170     g_assert_cmpint(s->fds_num, ==, s->memory.nregions);
 171
 172     g_mutex_unlock(&s->data_mutex);
 173 }
 174
 175 static void read_guest_mem(const void *data)
 176 {
 177     TestServer *s = (void *)data;
 178     uint32_t *guest_mem;
 179     int i, j;
 180     size_t size;
 181
 182     wait_for_fds(s);
 183
 184     g_mutex_lock(&s->data_mutex);
 185
 186     /* iterate all regions */
 187     for (i = 0; i < s->fds_num; i++) {
 188
 189         /* We'll check only the region statring at 0x0*/
 190         if (s->memory.regions[i].guest_phys_addr != 0x0) {
 191             continue;
 192         }
 193
 194         g_assert_cmpint(s->memory.regions[i].memory_size, >, 1024);
 195
 196         size = s->memory.regions[i].memory_size +
 197             s->memory.regions[i].mmap_offset;
 198
 199         guest_mem = mmap(0, size, PROT_READ | PROT_WRITE,
 200                          MAP_SHARED, s->fds[i], 0);
 201
 202         g_assert(guest_mem != MAP_FAILED);
 203         guest_mem += (s->memory.regions[i].mmap_offset / sizeof(*guest_mem));
 204
 205         for (j = 0; j < 256; j++) {
 206             uint32_t a = readl(s->memory.regions[i].guest_phys_addr + j*4);
 207             uint32_t b = guest_mem[j];
 208
 209             g_assert_cmpint(a, ==, b);
 210         }
 211
 212         munmap(guest_mem, s->memory.regions[i].memory_size);
 213     }
 214
 215     g_mutex_unlock(&s->data_mutex);
 216 }
 217
 218 static void *thread_function(void *data)
 219 {
 220     GMainLoop *loop = data;
 221     g_main_loop_run(loop);
 222     return NULL;
 223 }
 224
 225 static int chr_can_read(void *opaque)
 226 {
 227     return VHOST_USER_HDR_SIZE;
 228 }
 229
 230 static void chr_read(void *opaque, const uint8_t *buf, int size)
 231 {
 232     TestServer *s = opaque;
 233     CharDriverState *chr = s->chr;
 234     VhostUserMsg msg;
 235     uint8_t *p = (uint8_t *) &msg;
 236     int fd;
 237
 238     if (size != VHOST_USER_HDR_SIZE) {
 239         g_test_message("Wrong message size received %d\n", size);
 240         return;
 241     }
 242
 243     g_mutex_lock(&s->data_mutex);
 244     memcpy(p, buf, VHOST_USER_HDR_SIZE);
 245
 246     if (msg.size) {
 247         p += VHOST_USER_HDR_SIZE;
 248         g_assert_cmpint(qemu_chr_fe_read_all(chr, p, msg.size), ==, msg.size);
 249     }
 250
 251     switch (msg.request) {
 252     case VHOST_USER_GET_FEATURES:
 253         /* send back features to qemu */
 254         msg.flags |= VHOST_USER_REPLY_MASK;
 255         msg.size = sizeof(m.payload.u64);
 256         msg.payload.u64 = 0x1ULL << VHOST_F_LOG_ALL |
 257             0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES;
 258         p = (uint8_t *) &msg;
 259         qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
 260         break;
 261
 262     case VHOST_USER_SET_FEATURES:
 263         g_assert_cmpint(msg.payload.u64 & (0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES),
 264                         !=, 0ULL);
 265         break;
 266
 267     case VHOST_USER_GET_PROTOCOL_FEATURES:
 268         /* send back features to qemu */
 269         msg.flags |= VHOST_USER_REPLY_MASK;
 270         msg.size = sizeof(m.payload.u64);
 271         msg.payload.u64 = 1 << VHOST_USER_PROTOCOL_F_LOG_SHMFD;
 272         p = (uint8_t *) &msg;
 273         qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
 274         break;
 275
 276     case VHOST_USER_GET_VRING_BASE:
 277         /* send back vring base to qemu */
 278         msg.flags |= VHOST_USER_REPLY_MASK;
 279         msg.size = sizeof(m.payload.state);
 280         msg.payload.state.num = 0;
 281         p = (uint8_t *) &msg;
 282         qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
 283
 284         assert(msg.payload.state.index < 2);
 285         s->rings &= ~(0x1ULL << msg.payload.state.index);
 286         break;
 287
 288     case VHOST_USER_SET_MEM_TABLE:
 289         /* received the mem table */
 290         memcpy(&s->memory, &msg.payload.memory, sizeof(msg.payload.memory));
 291         s->fds_num = qemu_chr_fe_get_msgfds(chr, s->fds, G_N_ELEMENTS(s->fds));
 292
 293         /* signal the test that it can continue */
 294         g_cond_signal(&s->data_cond);
 295         break;
 296
 297     case VHOST_USER_SET_VRING_KICK:
 298     case VHOST_USER_SET_VRING_CALL:
 299         /* consume the fd */
 300         qemu_chr_fe_get_msgfds(chr, &fd, 1);
 301         /*
 302          * This is a non-blocking eventfd.
 303          * The receive function forces it to be blocking,
 304          * so revert it back to non-blocking.
 305          */
 306         qemu_set_nonblock(fd);
 307         break;
 308
 309     case VHOST_USER_SET_LOG_BASE:
 310         if (s->log_fd != -1) {
 311             close(s->log_fd);
 312             s->log_fd = -1;
 313         }
 314         qemu_chr_fe_get_msgfds(chr, &s->log_fd, 1);
 315         msg.flags |= VHOST_USER_REPLY_MASK;
 316         msg.size = 0;
 317         p = (uint8_t *) &msg;
 318         qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE);
 319
 320         g_cond_signal(&s->data_cond);
 321         break;
 322
 323     case VHOST_USER_SET_VRING_BASE:
 324         assert(msg.payload.state.index < 2);
 325         s->rings |= 0x1ULL << msg.payload.state.index;
 326         break;
 327
 328     default:
 329         break;
 330     }
 331
 332     g_mutex_unlock(&s->data_mutex);
 333 }
 334
 335 static const char *init_hugepagefs(const char *path)
 336 {
 337     struct statfs fs;
 338     int ret;
 339
 340     if (access(path, R_OK | W_OK | X_OK)) {
 341         g_test_message("access on path (%s): %s\n", path, strerror(errno));
 342         return NULL;
 343     }
 344
 345     do {
 346         ret = statfs(path, &fs);
 347     } while (ret != 0 && errno == EINTR);
 348
 349     if (ret != 0) {
 350         g_test_message("statfs on path (%s): %s\n", path, strerror(errno));
 351         return NULL;
 352     }
 353
 354     if (fs.f_type != HUGETLBFS_MAGIC) {
 355         g_test_message("Warning: path not on HugeTLBFS: %s\n", path);
 356         return NULL;
 357     }
 358
 359     return path;
 360 }
 361
 362 static TestServer *test_server_new(const gchar *name)
 363 {
 364     TestServer *server = g_new0(TestServer, 1);
 365     gchar *chr_path;
 366
 367     server->socket_path = g_strdup_printf("%s/%s.sock", tmpfs, name);
 368     server->mig_path = g_strdup_printf("%s/%s.mig", tmpfs, name);
 369
 370     chr_path = g_strdup_printf("unix:%s,server,nowait", server->socket_path);
 371     server->chr_name = g_strdup_printf("chr-%s", name);
 372     server->chr = qemu_chr_new(server->chr_name, chr_path, NULL);
 373     g_free(chr_path);
 374
 375     qemu_chr_add_handlers(server->chr, chr_can_read, chr_read, NULL, server);
 376
 377     g_mutex_init(&server->data_mutex);
 378     g_cond_init(&server->data_cond);
 379
 380     server->log_fd = -1;
 381
 382     return server;
 383 }
 384
 385 #define GET_QEMU_CMD(s)                                                        \
 386     g_strdup_printf(QEMU_CMD, 512, 512, (root), (s)->chr_name,                 \
 387                     (s)->socket_path, (s)->chr_name)
 388
 389 #define GET_QEMU_CMDE(s, mem, extra, ...)                                      \
 390     g_strdup_printf(QEMU_CMD extra, (mem), (mem), (root), (s)->chr_name,       \
 391                     (s)->socket_path, (s)->chr_name, ##__VA_ARGS__)
 392
 393 static gboolean _test_server_free(TestServer *server)
 394 {
 395     int i;
 396
 397     qemu_chr_delete(server->chr);
 398
 399     for (i = 0; i < server->fds_num; i++) {
 400         close(server->fds[i]);
 401     }
 402
 403     if (server->log_fd != -1) {
 404         close(server->log_fd);
 405     }
 406
 407     unlink(server->socket_path);
 408     g_free(server->socket_path);
 409
 410     unlink(server->mig_path);
 411     g_free(server->mig_path);
 412
 413     g_free(server->chr_name);
 414     g_free(server);
 415
 416     return FALSE;
 417 }
 418
 419 static void test_server_free(TestServer *server)
 420 {
 421     g_idle_add((GSourceFunc)_test_server_free, server);
 422 }
 423
 424 static void wait_for_log_fd(TestServer *s)
 425 {
 426     gint64 end_time;
 427
 428     g_mutex_lock(&s->data_mutex);
 429     end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
 430     while (s->log_fd == -1) {
 431         if (!g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
 432             /* timeout has passed */
 433             g_assert(s->log_fd != -1);
 434             break;
 435         }
 436     }
 437
 438     g_mutex_unlock(&s->data_mutex);
 439 }
 440
 441 static void write_guest_mem(TestServer *s, uint32_t seed)
 442 {
 443     uint32_t *guest_mem;
 444     int i, j;
 445     size_t size;
 446
 447     wait_for_fds(s);
 448
 449     /* iterate all regions */
 450     for (i = 0; i < s->fds_num; i++) {
 451
 452         /* We'll write only the region statring at 0x0 */
 453         if (s->memory.regions[i].guest_phys_addr != 0x0) {
 454             continue;
 455         }
 456
 457         g_assert_cmpint(s->memory.regions[i].memory_size, >, 1024);
 458
 459         size = s->memory.regions[i].memory_size +
 460             s->memory.regions[i].mmap_offset;
 461
 462         guest_mem = mmap(0, size, PROT_READ | PROT_WRITE,
 463                          MAP_SHARED, s->fds[i], 0);
 464
 465         g_assert(guest_mem != MAP_FAILED);
 466         guest_mem += (s->memory.regions[i].mmap_offset / sizeof(*guest_mem));
 467
 468         for (j = 0; j < 256; j++) {
 469             guest_mem[j] = seed + j;
 470         }
 471
 472         munmap(guest_mem, s->memory.regions[i].memory_size);
 473         break;
 474     }
 475 }
 476
 477 static guint64 get_log_size(TestServer *s)
 478 {
 479     guint64 log_size = 0;
 480     int i;
 481
 482     for (i = 0; i < s->memory.nregions; ++i) {
 483         VhostUserMemoryRegion *reg = &s->memory.regions[i];
 484         guint64 last = range_get_last(reg->guest_phys_addr,
 485                                        reg->memory_size);
 486         log_size = MAX(log_size, last / (8 * VHOST_LOG_PAGE) + 1);
 487     }
 488
 489     return log_size;
 490 }
 491
 492 typedef struct TestMigrateSource {
 493     GSource source;
 494     TestServer *src;
 495     TestServer *dest;
 496 } TestMigrateSource;
 497
 498 static gboolean
 499 test_migrate_source_check(GSource *source)
 500 {
 501     TestMigrateSource *t = (TestMigrateSource *)source;
 502     gboolean overlap = t->src->rings && t->dest->rings;
 503
 504     g_assert(!overlap);
 505
 506     return FALSE;
 507 }
 508
 509 #if !GLIB_CHECK_VERSION(2,36,0)
 510 /* this callback is unnecessary with glib >2.36, the default
 511  * prepare for the source does the same */
 512 static gboolean
 513 test_migrate_source_prepare(GSource *source, gint *timeout)
 514 {
 515     *timeout = -1;
 516     return FALSE;
 517 }
 518 #endif
 519
 520 GSourceFuncs test_migrate_source_funcs = {
 521 #if !GLIB_CHECK_VERSION(2,36,0)
 522     .prepare = test_migrate_source_prepare,
 523 #endif
 524     .check = test_migrate_source_check,
 525 };
 526
 527 static void test_migrate(void)
 528 {
 529     TestServer *s = test_server_new("src");
 530     TestServer *dest = test_server_new("dest");
 531     char *uri = g_strdup_printf("%s%s", "unix:", dest->mig_path);
 532     QTestState *global = global_qtest, *from, *to;
 533     GSource *source;
 534     gchar *cmd;
 535     QDict *rsp;
 536     guint8 *log;
 537     guint64 size;
 538
 539     cmd = GET_QEMU_CMDE(s, 2, "");
 540     from = qtest_start(cmd);
 541     g_free(cmd);
 542
 543     wait_for_fds(s);
 544     size = get_log_size(s);
 545     g_assert_cmpint(size, ==, (2 * 1024 * 1024) / (VHOST_LOG_PAGE * 8));
 546
 547     cmd = GET_QEMU_CMDE(dest, 2, " -incoming %s", uri);
 548     to = qtest_init(cmd);
 549     g_free(cmd);
 550
 551     source = g_source_new(&test_migrate_source_funcs,
 552                           sizeof(TestMigrateSource));
 553     ((TestMigrateSource *)source)->src = s;
 554     ((TestMigrateSource *)source)->dest = dest;
 555     g_source_attach(source, NULL);
 556
 557     /* slow down migration to have time to fiddle with log */
 558     /* TODO: qtest could learn to break on some places */
 559     rsp = qmp("{ 'execute': 'migrate_set_speed',"
 560               "'arguments': { 'value': 10 } }");
 561     g_assert(qdict_haskey(rsp, "return"));
 562     QDECREF(rsp);
 563
 564     cmd = g_strdup_printf("{ 'execute': 'migrate',"
 565                           "'arguments': { 'uri': '%s' } }",
 566                           uri);
 567     rsp = qmp(cmd);
 568     g_free(cmd);
 569     g_assert(qdict_haskey(rsp, "return"));
 570     QDECREF(rsp);
 571
 572     wait_for_log_fd(s);
 573
 574     log = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, s->log_fd, 0);
 575     g_assert(log != MAP_FAILED);
 576
 577     /* modify first page */
 578     write_guest_mem(s, 0x42);
 579     log[0] = 1;
 580     munmap(log, size);
 581
 582     /* speed things up */
 583     rsp = qmp("{ 'execute': 'migrate_set_speed',"
 584               "'arguments': { 'value': 0 } }");
 585     g_assert(qdict_haskey(rsp, "return"));
 586     QDECREF(rsp);
 587
 588     qmp_eventwait("STOP");
 589
 590     global_qtest = to;
 591     qmp_eventwait("RESUME");
 592
 593     read_guest_mem(dest);
 594
 595     g_source_destroy(source);
 596     g_source_unref(source);
 597
 598     qtest_quit(to);
 599     test_server_free(dest);
 600     qtest_quit(from);
 601     test_server_free(s);
 602     g_free(uri);
 603
 604     global_qtest = global;
 605 }
 606
 607 int main(int argc, char **argv)
 608 {
 609     QTestState *s = NULL;
 610     TestServer *server = NULL;
 611     const char *hugefs;
 612     char *qemu_cmd = NULL;
 613     int ret;
 614     char template[] = "/tmp/vhost-test-XXXXXX";
 615     GMainLoop *loop;
 616     GThread *thread;
 617
 618     g_test_init(&argc, &argv, NULL);
 619
 620     module_call_init(MODULE_INIT_QOM);
 621     qemu_add_opts(&qemu_chardev_opts);
 622
 623     tmpfs = mkdtemp(template);
 624     if (!tmpfs) {
 625         g_test_message("mkdtemp on path (%s): %s\n", template, strerror(errno));
 626     }
 627     g_assert(tmpfs);
 628
 629     hugefs = getenv("QTEST_HUGETLBFS_PATH");
 630     if (hugefs) {
 631         root = init_hugepagefs(hugefs);
 632         g_assert(root);
 633     } else {
 634         root = tmpfs;
 635     }
 636
 637     server = test_server_new("test");
 638
 639     loop = g_main_loop_new(NULL, FALSE);
 640     /* run the main loop thread so the chardev may operate */
 641     thread = g_thread_new(NULL, thread_function, loop);
 642
 643     qemu_cmd = GET_QEMU_CMD(server);
 644
 645     s = qtest_start(qemu_cmd);
 646     g_free(qemu_cmd);
 647
 648     qtest_add_data_func("/vhost-user/read-guest-mem", server, read_guest_mem);
 649     qtest_add_func("/vhost-user/migrate", test_migrate);
 650
 651     ret = g_test_run();
 652
 653     if (s) {
 654         qtest_quit(s);
 655     }
 656
 657     /* cleanup */
 658     test_server_free(server);
 659
 660     /* finish the helper thread and dispatch pending sources */
 661     g_main_loop_quit(loop);
 662     g_thread_join(thread);
 663     while (g_main_context_pending(NULL)) {
 664         g_main_context_iteration (NULL, TRUE);
 665     }
 666     g_main_loop_unref(loop);
 667
 668     ret = rmdir(tmpfs);
 669     if (ret != 0) {
 670         g_test_message("unable to rmdir: path (%s): %s\n",
 671                        tmpfs, strerror(errno));
 672     }
 673     g_assert_cmpint(ret, ==, 0);
 674
 675     return ret;
 676 }