aboutsummaryrefslogtreecommitdiff
path: root/tests/vhost-user-test.c
blob: bbc80912865a44b30fab34bdf2c4626c38462f38 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
/*
 * QTest testcase for the vhost-user
 *
 * Copyright (c) 2014 Virtual Open Systems Sarl.
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */

#include "qemu/osdep.h"

#include "libqtest.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "qemu/config-file.h"
#include "qemu/option.h"
#include "qemu/range.h"
#include "qemu/sockets.h"
#include "chardev/char-fe.h"
#include "qemu/memfd.h"
#include "sysemu/sysemu.h"
#include "libqos/libqos.h"
#include "libqos/pci-pc.h"
#include "libqos/virtio-pci.h"

#include "libqos/malloc-pc.h"
#include "hw/virtio/virtio-net.h"

#include <linux/vhost.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_net.h>
#include <sys/vfs.h>

/* GLIB version compatibility flags */
#if !GLIB_CHECK_VERSION(2, 26, 0)
#define G_TIME_SPAN_SECOND              (G_GINT64_CONSTANT(1000000))
#endif

#if GLIB_CHECK_VERSION(2, 28, 0)
#define HAVE_MONOTONIC_TIME
#endif

#define QEMU_CMD_MEM    " -m %d -object memory-backend-file,id=mem,size=%dM," \
                        "mem-path=%s,share=on -numa node,memdev=mem"
#define QEMU_CMD_MEMFD  " -m %d -object memory-backend-memfd,id=mem,size=%dM," \
                        " -numa node,memdev=mem"
#define QEMU_CMD_CHR    " -chardev socket,id=%s,path=%s%s"
#define QEMU_CMD_NETDEV " -netdev vhost-user,id=net0,chardev=%s,vhostforce"
#define QEMU_CMD_NET    " -device virtio-net-pci,netdev=net0"

#define HUGETLBFS_MAGIC       0x958458f6

/*********** FROM hw/virtio/vhost-user.c *************************************/

#define VHOST_MEMORY_MAX_NREGIONS    8
#define VHOST_MAX_VIRTQUEUES    0x100

#define VHOST_USER_F_PROTOCOL_FEATURES 30
#define VHOST_USER_PROTOCOL_F_MQ 0
#define VHOST_USER_PROTOCOL_F_LOG_SHMFD 1

#define VHOST_LOG_PAGE 0x1000

typedef enum VhostUserRequest {
    VHOST_USER_NONE = 0,
    VHOST_USER_GET_FEATURES = 1,
    VHOST_USER_SET_FEATURES = 2,
    VHOST_USER_SET_OWNER = 3,
    VHOST_USER_RESET_OWNER = 4,
    VHOST_USER_SET_MEM_TABLE = 5,
    VHOST_USER_SET_LOG_BASE = 6,
    VHOST_USER_SET_LOG_FD = 7,
    VHOST_USER_SET_VRING_NUM = 8,
    VHOST_USER_SET_VRING_ADDR = 9,
    VHOST_USER_SET_VRING_BASE = 10,
    VHOST_USER_GET_VRING_BASE = 11,
    VHOST_USER_SET_VRING_KICK = 12,
    VHOST_USER_SET_VRING_CALL = 13,
    VHOST_USER_SET_VRING_ERR = 14,
    VHOST_USER_GET_PROTOCOL_FEATURES = 15,
    VHOST_USER_SET_PROTOCOL_FEATURES = 16,
    VHOST_USER_GET_QUEUE_NUM = 17,
    VHOST_USER_SET_VRING_ENABLE = 18,
    VHOST_USER_MAX
} VhostUserRequest;

typedef struct VhostUserMemoryRegion {
    uint64_t guest_phys_addr;
    uint64_t memory_size;
    uint64_t userspace_addr;
    uint64_t mmap_offset;
} VhostUserMemoryRegion;

typedef struct VhostUserMemory {
    uint32_t nregions;
    uint32_t padding;
    VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
} VhostUserMemory;

typedef struct VhostUserLog {
    uint64_t mmap_size;
    uint64_t mmap_offset;
} VhostUserLog;

typedef struct VhostUserMsg {
    VhostUserRequest request;

#define VHOST_USER_VERSION_MASK     (0x3)
#define VHOST_USER_REPLY_MASK       (0x1<<2)
    uint32_t flags;
    uint32_t size; /* the following payload size */
    union {
#define VHOST_USER_VRING_IDX_MASK   (0xff)
#define VHOST_USER_VRING_NOFD_MASK  (0x1<<8)
        uint64_t u64;
        struct vhost_vring_state state;
        struct vhost_vring_addr addr;
        VhostUserMemory memory;
        VhostUserLog log;
    } payload;
} QEMU_PACKED VhostUserMsg;

static VhostUserMsg m __attribute__ ((unused));
#define VHOST_USER_HDR_SIZE (sizeof(m.request) \
                            + sizeof(m.flags) \
                            + sizeof(m.size))

#define VHOST_USER_PAYLOAD_SIZE (sizeof(m) - VHOST_USER_HDR_SIZE)

/* The version of the protocol we support */
#define VHOST_USER_VERSION    (0x1)
/*****************************************************************************/

enum {
    TEST_FLAGS_OK,
    TEST_FLAGS_DISCONNECT,
    TEST_FLAGS_BAD,
    TEST_FLAGS_END,
};

typedef struct TestServer {
    QPCIBus *bus;
    QVirtioPCIDevice *dev;
    QVirtQueue *vq[VHOST_MAX_VIRTQUEUES];
    gchar *socket_path;
    gchar *mig_path;
    gchar *chr_name;
    CharBackend chr;
    int fds_num;
    int fds[VHOST_MEMORY_MAX_NREGIONS];
    VhostUserMemory memory;
    CompatGMutex data_mutex;
    CompatGCond data_cond;
    int log_fd;
    uint64_t rings;
    bool test_fail;
    int test_flags;
    int queues;
    QGuestAllocator *alloc;
} TestServer;

static TestServer *test_server_new(const gchar *name);
static void test_server_free(TestServer *server);
static void test_server_listen(TestServer *server);

static const char *tmpfs;
static const char *root;

enum test_memfd {
    TEST_MEMFD_AUTO,
    TEST_MEMFD_YES,
    TEST_MEMFD_NO,
};

static char *get_qemu_cmd(TestServer *s,
                          int mem, enum test_memfd memfd, const char *mem_path,
                          const char *chr_opts, const char *extra)
{
    if (memfd == TEST_MEMFD_AUTO && qemu_memfd_check()) {
        memfd = TEST_MEMFD_YES;
    }

    if (memfd == TEST_MEMFD_YES) {
        return g_strdup_printf(QEMU_CMD_MEMFD QEMU_CMD_CHR
                               QEMU_CMD_NETDEV QEMU_CMD_NET "%s", mem, mem,
                               s->chr_name, s->socket_path,
                               chr_opts, s->chr_name, extra);
    } else {
        return g_strdup_printf(QEMU_CMD_MEM QEMU_CMD_CHR
                               QEMU_CMD_NETDEV QEMU_CMD_NET "%s", mem, mem,
                               mem_path, s->chr_name, s->socket_path,
                               chr_opts, s->chr_name, extra);
    }
}

static void init_virtio_dev(TestServer *s, uint32_t features_mask)
{
    uint32_t features;
    int i;

    s->bus = qpci_init_pc(global_qtest, NULL);
    g_assert_nonnull(s->bus);

    s->dev = qvirtio_pci_device_find(s->bus, VIRTIO_ID_NET);
    g_assert_nonnull(s->dev);

    qvirtio_pci_device_enable(s->dev);
    qvirtio_reset(&s->dev->vdev);
    qvirtio_set_acknowledge(&s->dev->vdev);
    qvirtio_set_driver(&s->dev->vdev);

    s->alloc = pc_alloc_init(global_qtest);

    for (i = 0; i < s->queues * 2; i++) {
        s->vq[i] = qvirtqueue_setup(&s->dev->vdev, s->alloc, i);
    }

    features = qvirtio_get_features(&s->dev->vdev);
    features = features & features_mask;
    qvirtio_set_features(&s->dev->vdev, features);

    qvirtio_set_driver_ok(&s->dev->vdev);
}

static void uninit_virtio_dev(TestServer *s)
{
    int i;

    for (i = 0; i < s->queues * 2; i++) {
        qvirtqueue_cleanup(s->dev->vdev.bus, s->vq[i], s->alloc);
    }
    pc_alloc_uninit(s->alloc);

    qvirtio_pci_device_free(s->dev);
}

static void wait_for_fds(TestServer *s)
{
    gint64 end_time;

    g_mutex_lock(&s->data_mutex);

    end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
    while (!s->fds_num) {
        if (!g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
            /* timeout has passed */
            g_assert(s->fds_num);
            break;
        }
    }

    /* check for sanity */
    g_assert_cmpint(s->fds_num, >, 0);
    g_assert_cmpint(s->fds_num, ==, s->memory.nregions);

    g_mutex_unlock(&s->data_mutex);
}

static void read_guest_mem_server(TestServer *s)
{
    uint32_t *guest_mem;
    int i, j;
    size_t size;

    wait_for_fds(s);

    g_mutex_lock(&s->data_mutex);

    /* iterate all regions */
    for (i = 0; i < s->fds_num; i++) {

        /* We'll check only the region statring at 0x0*/
        if (s->memory.regions[i].guest_phys_addr != 0x0) {
            continue;
        }

        g_assert_cmpint(s->memory.regions[i].memory_size, >, 1024);

        size = s->memory.regions[i].memory_size +
            s->memory.regions[i].mmap_offset;

        guest_mem = mmap(0, size, PROT_READ | PROT_WRITE,
                         MAP_SHARED, s->fds[i], 0);

        g_assert(guest_mem != MAP_FAILED);
        guest_mem += (s->memory.regions[i].mmap_offset / sizeof(*guest_mem));

        for (j = 0; j < 256; j++) {
            uint32_t a = readl(s->memory.regions[i].guest_phys_addr + j*4);
            uint32_t b = guest_mem[j];

            g_assert_cmpint(a, ==, b);
        }

        munmap(guest_mem, s->memory.regions[i].memory_size);
    }

    g_mutex_unlock(&s->data_mutex);
}

static void *thread_function(void *data)
{
    GMainLoop *loop = data;
    g_main_loop_run(loop);
    return NULL;
}

static int chr_can_read(void *opaque)
{
    return VHOST_USER_HDR_SIZE;
}

static void chr_read(void *opaque, const uint8_t *buf, int size)
{
    TestServer *s = opaque;
    CharBackend *chr = &s->chr;
    VhostUserMsg msg;
    uint8_t *p = (uint8_t *) &msg;
    int fd;

    if (s->test_fail) {
        qemu_chr_fe_disconnect(chr);
        /* now switch to non-failure */
        s->test_fail = false;
    }

    if (size != VHOST_USER_HDR_SIZE) {
        g_test_message("Wrong message size received %d\n", size);
        return;
    }

    g_mutex_lock(&s->data_mutex);
    memcpy(p, buf, VHOST_USER_HDR_SIZE);

    if (msg.size) {
        p += VHOST_USER_HDR_SIZE;
        size = qemu_chr_fe_read_all(chr, p, msg.size);
        if (size != msg.size) {
            g_test_message("Wrong message size received %d != %d\n",
                           size, msg.size);
            return;
        }
    }

    switch (msg.request) {
    case VHOST_USER_GET_FEATURES:
        /* send back features to qemu */
        msg.flags |= VHOST_USER_REPLY_MASK;
        msg.size = sizeof(m.payload.u64);
        msg.payload.u64 = 0x1ULL << VHOST_F_LOG_ALL |
            0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES;
        if (s->queues > 1) {
            msg.payload.u64 |= 0x1ULL << VIRTIO_NET_F_MQ;
        }
        if (s->test_flags >= TEST_FLAGS_BAD) {
            msg.payload.u64 = 0;
            s->test_flags = TEST_FLAGS_END;
        }
        p = (uint8_t *) &msg;
        qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
        break;

    case VHOST_USER_SET_FEATURES:
	g_assert_cmpint(msg.payload.u64 & (0x1ULL << VHOST_USER_F_PROTOCOL_FEATURES),
			!=, 0ULL);
        if (s->test_flags == TEST_FLAGS_DISCONNECT) {
            qemu_chr_fe_disconnect(chr);
            s->test_flags = TEST_FLAGS_BAD;
        }
        break;

    case VHOST_USER_GET_PROTOCOL_FEATURES:
        /* send back features to qemu */
        msg.flags |= VHOST_USER_REPLY_MASK;
        msg.size = sizeof(m.payload.u64);
        msg.payload.u64 = 1 << VHOST_USER_PROTOCOL_F_LOG_SHMFD;
        if (s->queues > 1) {
            msg.payload.u64 |= 1 << VHOST_USER_PROTOCOL_F_MQ;
        }
        p = (uint8_t *) &msg;
        qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
        break;

    case VHOST_USER_GET_VRING_BASE:
        /* send back vring base to qemu */
        msg.flags |= VHOST_USER_REPLY_MASK;
        msg.size = sizeof(m.payload.state);
        msg.payload.state.num = 0;
        p = (uint8_t *) &msg;
        qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);

        assert(msg.payload.state.index < s->queues * 2);
        s->rings &= ~(0x1ULL << msg.payload.state.index);
        break;

    case VHOST_USER_SET_MEM_TABLE:
        /* received the mem table */
        memcpy(&s->memory, &msg.payload.memory, sizeof(msg.payload.memory));
        s->fds_num = qemu_chr_fe_get_msgfds(chr, s->fds,
                                            G_N_ELEMENTS(s->fds));

        /* signal the test that it can continue */
        g_cond_signal(&s->data_cond);
        break;

    case VHOST_USER_SET_VRING_KICK:
    case VHOST_USER_SET_VRING_CALL:
        /* consume the fd */
        qemu_chr_fe_get_msgfds(chr, &fd, 1);
        /*
         * This is a non-blocking eventfd.
         * The receive function forces it to be blocking,
         * so revert it back to non-blocking.
         */
        qemu_set_nonblock(fd);
        break;

    case VHOST_USER_SET_LOG_BASE:
        if (s->log_fd != -1) {
            close(s->log_fd);
            s->log_fd = -1;
        }
        qemu_chr_fe_get_msgfds(chr, &s->log_fd, 1);
        msg.flags |= VHOST_USER_REPLY_MASK;
        msg.size = 0;
        p = (uint8_t *) &msg;
        qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE);

        g_cond_signal(&s->data_cond);
        break;

    case VHOST_USER_SET_VRING_BASE:
        assert(msg.payload.state.index < s->queues * 2);
        s->rings |= 0x1ULL << msg.payload.state.index;
        break;

    case VHOST_USER_GET_QUEUE_NUM:
        msg.flags |= VHOST_USER_REPLY_MASK;
        msg.size = sizeof(m.payload.u64);
        msg.payload.u64 = s->queues;
        p = (uint8_t *) &msg;
        qemu_chr_fe_write_all(chr, p, VHOST_USER_HDR_SIZE + msg.size);
        break;

    default:
        break;
    }

    g_mutex_unlock(&s->data_mutex);
}

static const char *init_hugepagefs(const char *path)
{
    struct statfs fs;
    int ret;

    if (access(path, R_OK | W_OK | X_OK)) {
        g_test_message("access on path (%s): %s\n", path, strerror(errno));
        return NULL;
    }

    do {
        ret = statfs(path, &fs);
    } while (ret != 0 && errno == EINTR);

    if (ret != 0) {
        g_test_message("statfs on path (%s): %s\n", path, strerror(errno));
        return NULL;
    }

    if (fs.f_type != HUGETLBFS_MAGIC) {
        g_test_message("Warning: path not on HugeTLBFS: %s\n", path);
        return NULL;
    }

    return path;
}

static TestServer *test_server_new(const gchar *name)
{
    TestServer *server = g_new0(TestServer, 1);

    server->socket_path = g_strdup_printf("%s/%s.sock", tmpfs, name);
    server->mig_path = g_strdup_printf("%s/%s.mig", tmpfs, name);
    server->chr_name = g_strdup_printf("chr-%s", name);

    g_mutex_init(&server->data_mutex);
    g_cond_init(&server->data_cond);

    server->log_fd = -1;
    server->queues = 1;

    return server;
}

static void chr_event(void *opaque, int event)
{
    TestServer *s = opaque;

    if (s->test_flags == TEST_FLAGS_END &&
        event == CHR_EVENT_CLOSED) {
        s->test_flags = TEST_FLAGS_OK;
    }
}

static void test_server_create_chr(TestServer *server, const gchar *opt)
{
    gchar *chr_path;
    Chardev *chr;

    chr_path = g_strdup_printf("unix:%s%s", server->socket_path, opt);
    chr = qemu_chr_new(server->chr_name, chr_path);
    g_free(chr_path);

    g_assert_nonnull(chr);
    qemu_chr_fe_init(&server->chr, chr, &error_abort);
    qemu_chr_fe_set_handlers(&server->chr, chr_can_read, chr_read,
                             chr_event, NULL, server, NULL, true);
}

static void test_server_listen(TestServer *server)
{
    test_server_create_chr(server, ",server,nowait");
}

static gboolean _test_server_free(TestServer *server)
{
    int i;

    qemu_chr_fe_deinit(&server->chr, true);

    for (i = 0; i < server->fds_num; i++) {
        close(server->fds[i]);
    }

    if (server->log_fd != -1) {
        close(server->log_fd);
    }

    unlink(server->socket_path);
    g_free(server->socket_path);

    unlink(server->mig_path);
    g_free(server->mig_path);

    g_free(server->chr_name);
    qpci_free_pc(server->bus);

    g_free(server);

    return FALSE;
}

static void test_server_free(TestServer *server)
{
    g_idle_add((GSourceFunc)_test_server_free, server);
}

static void wait_for_log_fd(TestServer *s)
{
    gint64 end_time;

    g_mutex_lock(&s->data_mutex);
    end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
    while (s->log_fd == -1) {
        if (!g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
            /* timeout has passed */
            g_assert(s->log_fd != -1);
            break;
        }
    }

    g_mutex_unlock(&s->data_mutex);
}

static void write_guest_mem(TestServer *s, uint32_t seed)
{
    uint32_t *guest_mem;
    int i, j;
    size_t size;

    wait_for_fds(s);

    /* iterate all regions */
    for (i = 0; i < s->fds_num; i++) {

        /* We'll write only the region statring at 0x0 */
        if (s->memory.regions[i].guest_phys_addr != 0x0) {
            continue;
        }

        g_assert_cmpint(s->memory.regions[i].memory_size, >, 1024);

        size = s->memory.regions[i].memory_size +
            s->memory.regions[i].mmap_offset;

        guest_mem = mmap(0, size, PROT_READ | PROT_WRITE,
                         MAP_SHARED, s->fds[i], 0);

        g_assert(guest_mem != MAP_FAILED);
        guest_mem += (s->memory.regions[i].mmap_offset / sizeof(*guest_mem));

        for (j = 0; j < 256; j++) {
            guest_mem[j] = seed + j;
        }

        munmap(guest_mem, s->memory.regions[i].memory_size);
        break;
    }
}

static guint64 get_log_size(TestServer *s)
{
    guint64 log_size = 0;
    int i;

    for (i = 0; i < s->memory.nregions; ++i) {
        VhostUserMemoryRegion *reg = &s->memory.regions[i];
        guint64 last = range_get_last(reg->guest_phys_addr,
                                       reg->memory_size);
        log_size = MAX(log_size, last / (8 * VHOST_LOG_PAGE) + 1);
    }

    return log_size;
}

typedef struct TestMigrateSource {
    GSource source;
    TestServer *src;
    TestServer *dest;
} TestMigrateSource;

static gboolean
test_migrate_source_check(GSource *source)
{
    TestMigrateSource *t = (TestMigrateSource *)source;
    gboolean overlap = t->src->rings && t->dest->rings;

    g_assert(!overlap);

    return FALSE;
}

#if !GLIB_CHECK_VERSION(2,36,0)
/* this callback is unnecessary with glib >2.36, the default
 * prepare for the source does the same */
static gboolean
test_migrate_source_prepare(GSource *source, gint *timeout)
{
    *timeout = -1;
    return FALSE;
}
#endif

GSourceFuncs test_migrate_source_funcs = {
#if !GLIB_CHECK_VERSION(2,36,0)
    .prepare = test_migrate_source_prepare,
#endif
    .check = test_migrate_source_check,
};

static void test_read_guest_mem(const void *arg)
{
    enum test_memfd memfd = GPOINTER_TO_INT(arg);
    TestServer *server = NULL;
    char *qemu_cmd = NULL;
    QTestState *s = NULL;

    server = test_server_new(memfd == TEST_MEMFD_YES ?
                             "read-guest-memfd" : "read-guest-mem");
    test_server_listen(server);

    qemu_cmd = get_qemu_cmd(server, 512, memfd, root, "", "");

    s = qtest_start(qemu_cmd);
    g_free(qemu_cmd);

    init_virtio_dev(server, 1u << VIRTIO_NET_F_MAC);

    read_guest_mem_server(server);

    uninit_virtio_dev(server);

    qtest_quit(s);
    test_server_free(server);
}

static void test_migrate(void)
{
    TestServer *s = test_server_new("src");
    TestServer *dest = test_server_new("dest");
    char *uri = g_strdup_printf("%s%s", "unix:", dest->mig_path);
    QTestState *global = global_qtest, *from, *to;
    GSource *source;
    gchar *cmd, *tmp;
    QDict *rsp;
    guint8 *log;
    guint64 size;

    test_server_listen(s);
    test_server_listen(dest);

    cmd = get_qemu_cmd(s, 2, TEST_MEMFD_AUTO, root, "", "");
    from = qtest_start(cmd);
    g_free(cmd);

    init_virtio_dev(s, 1u << VIRTIO_NET_F_MAC);
    wait_for_fds(s);
    size = get_log_size(s);
    g_assert_cmpint(size, ==, (2 * 1024 * 1024) / (VHOST_LOG_PAGE * 8));

    tmp = g_strdup_printf(" -incoming %s", uri);
    cmd = get_qemu_cmd(dest, 2, TEST_MEMFD_AUTO, root, "", tmp);
    g_free(tmp);
    to = qtest_init(cmd);
    g_free(cmd);

    source = g_source_new(&test_migrate_source_funcs,
                          sizeof(TestMigrateSource));
    ((TestMigrateSource *)source)->src = s;
    ((TestMigrateSource *)source)->dest = dest;
    g_source_attach(source, NULL);

    /* slow down migration to have time to fiddle with log */
    /* TODO: qtest could learn to break on some places */
    rsp = qmp("{ 'execute': 'migrate_set_speed',"
              "'arguments': { 'value': 10 } }");
    g_assert(qdict_haskey(rsp, "return"));
    qobject_unref(rsp);

    cmd = g_strdup_printf("{ 'execute': 'migrate',"
                          "'arguments': { 'uri': '%s' } }",
                          uri);
    rsp = qmp(cmd);
    g_free(cmd);
    g_assert(qdict_haskey(rsp, "return"));
    qobject_unref(rsp);

    wait_for_log_fd(s);

    log = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, s->log_fd, 0);
    g_assert(log != MAP_FAILED);

    /* modify first page */
    write_guest_mem(s, 0x42);
    log[0] = 1;
    munmap(log, size);

    /* speed things up */
    rsp = qmp("{ 'execute': 'migrate_set_speed',"
              "'arguments': { 'value': 0 } }");
    g_assert(qdict_haskey(rsp, "return"));
    qobject_unref(rsp);

    qmp_eventwait("STOP");

    global_qtest = to;
    qmp_eventwait("RESUME");

    read_guest_mem_server(dest);

    uninit_virtio_dev(s);

    g_source_destroy(source);
    g_source_unref(source);

    qtest_quit(to);
    test_server_free(dest);
    qtest_quit(from);
    test_server_free(s);
    g_free(uri);

    global_qtest = global;
}

static void wait_for_rings_started(TestServer *s, size_t count)
{
    gint64 end_time;

    g_mutex_lock(&s->data_mutex);
    end_time = g_get_monotonic_time() + 5 * G_TIME_SPAN_SECOND;
    while (ctpop64(s->rings) != count) {
        if (!g_cond_wait_until(&s->data_cond, &s->data_mutex, end_time)) {
            /* timeout has passed */
            g_assert_cmpint(ctpop64(s->rings), ==, count);
            break;
        }
    }

    g_mutex_unlock(&s->data_mutex);
}

#if defined(CONFIG_HAS_GLIB_SUBPROCESS_TESTS)
static inline void test_server_connect(TestServer *server)
{
    test_server_create_chr(server, ",reconnect=1");
}

static gboolean
reconnect_cb(gpointer user_data)
{
    TestServer *s = user_data;

    qemu_chr_fe_disconnect(&s->chr);

    return FALSE;
}

static gpointer
connect_thread(gpointer data)
{
    TestServer *s = data;

    /* wait for qemu to start before first try, to avoid extra warnings */
    g_usleep(G_USEC_PER_SEC);
    test_server_connect(s);

    return NULL;
}

static void test_reconnect_subprocess(void)
{
    TestServer *s = test_server_new("reconnect");
    char *cmd;

    g_thread_new("connect", connect_thread, s);
    cmd = get_qemu_cmd(s, 2, TEST_MEMFD_AUTO, root, ",server", "");
    qtest_start(cmd);
    g_free(cmd);

    init_virtio_dev(s, 1u << VIRTIO_NET_F_MAC);
    wait_for_fds(s);
    wait_for_rings_started(s, 2);

    /* reconnect */
    s->fds_num = 0;
    s->rings = 0;
    g_idle_add(reconnect_cb, s);
    wait_for_fds(s);
    wait_for_rings_started(s, 2);

    uninit_virtio_dev(s);

    qtest_end();
    test_server_free(s);
    return;
}

static void test_reconnect(void)
{
    gchar *path = g_strdup_printf("/%s/vhost-user/reconnect/subprocess",
                                  qtest_get_arch());
    g_test_trap_subprocess(path, 0, 0);
    g_test_trap_assert_passed();
    g_free(path);
}

static void test_connect_fail_subprocess(void)
{
    TestServer *s = test_server_new("connect-fail");
    char *cmd;

    s->test_fail = true;
    g_thread_new("connect", connect_thread, s);
    cmd = get_qemu_cmd(s, 2, TEST_MEMFD_AUTO, root, ",server", "");
    qtest_start(cmd);
    g_free(cmd);

    init_virtio_dev(s, 1u << VIRTIO_NET_F_MAC);
    wait_for_fds(s);
    wait_for_rings_started(s, 2);

    uninit_virtio_dev(s);

    qtest_end();
    test_server_free(s);
}

static void test_connect_fail(void)
{
    gchar *path = g_strdup_printf("/%s/vhost-user/connect-fail/subprocess",
                                  qtest_get_arch());
    g_test_trap_subprocess(path, 0, 0);
    g_test_trap_assert_passed();
    g_free(path);
}

static void test_flags_mismatch_subprocess(void)
{
    TestServer *s = test_server_new("flags-mismatch");
    char *cmd;

    s->test_flags = TEST_FLAGS_DISCONNECT;
    g_thread_new("connect", connect_thread, s);
    cmd = get_qemu_cmd(s, 2, TEST_MEMFD_AUTO, root, ",server", "");
    qtest_start(cmd);
    g_free(cmd);

    init_virtio_dev(s, 1u << VIRTIO_NET_F_MAC);
    wait_for_fds(s);
    wait_for_rings_started(s, 2);

    uninit_virtio_dev(s);

    qtest_end();
    test_server_free(s);
}

static void test_flags_mismatch(void)
{
    gchar *path = g_strdup_printf("/%s/vhost-user/flags-mismatch/subprocess",
                                  qtest_get_arch());
    g_test_trap_subprocess(path, 0, 0);
    g_test_trap_assert_passed();
    g_free(path);
}

#endif

static void test_multiqueue(void)
{
    TestServer *s = test_server_new("mq");
    char *cmd;
    uint32_t features_mask = ~(QVIRTIO_F_BAD_FEATURE |
                            (1u << VIRTIO_RING_F_INDIRECT_DESC) |
                            (1u << VIRTIO_RING_F_EVENT_IDX));
    s->queues = 2;
    test_server_listen(s);

    if (qemu_memfd_check()) {
        cmd = g_strdup_printf(
            QEMU_CMD_MEMFD QEMU_CMD_CHR QEMU_CMD_NETDEV ",queues=%d "
            "-device virtio-net-pci,netdev=net0,mq=on,vectors=%d",
            512, 512, s->chr_name,
            s->socket_path, "", s->chr_name,
            s->queues, s->queues * 2 + 2);
    } else {
        cmd = g_strdup_printf(
            QEMU_CMD_MEM QEMU_CMD_CHR QEMU_CMD_NETDEV ",queues=%d "
            "-device virtio-net-pci,netdev=net0,mq=on,vectors=%d",
            512, 512, root, s->chr_name,
            s->socket_path, "", s->chr_name,
            s->queues, s->queues * 2 + 2);
    }
    qtest_start(cmd);
    g_free(cmd);

    init_virtio_dev(s, features_mask);

    wait_for_rings_started(s, s->queues * 2);

    uninit_virtio_dev(s);

    qtest_end();

    test_server_free(s);
}

int main(int argc, char **argv)
{
    const char *hugefs;
    int ret;
    char template[] = "/tmp/vhost-test-XXXXXX";
    GMainLoop *loop;
    GThread *thread;

    g_test_init(&argc, &argv, NULL);

    module_call_init(MODULE_INIT_QOM);
    qemu_add_opts(&qemu_chardev_opts);

    tmpfs = mkdtemp(template);
    if (!tmpfs) {
        g_test_message("mkdtemp on path (%s): %s\n", template, strerror(errno));
    }
    g_assert(tmpfs);

    hugefs = getenv("QTEST_HUGETLBFS_PATH");
    if (hugefs) {
        root = init_hugepagefs(hugefs);
        g_assert(root);
    } else {
        root = tmpfs;
    }

    loop = g_main_loop_new(NULL, FALSE);
    /* run the main loop thread so the chardev may operate */
    thread = g_thread_new(NULL, thread_function, loop);

    if (qemu_memfd_check()) {
        qtest_add_data_func("/vhost-user/read-guest-mem/memfd",
                            GINT_TO_POINTER(TEST_MEMFD_YES),
                            test_read_guest_mem);
    }
    qtest_add_data_func("/vhost-user/read-guest-mem/memfile",
                        GINT_TO_POINTER(TEST_MEMFD_NO), test_read_guest_mem);
    qtest_add_func("/vhost-user/migrate", test_migrate);
    qtest_add_func("/vhost-user/multiqueue", test_multiqueue);

#if defined(CONFIG_HAS_GLIB_SUBPROCESS_TESTS)
    /* keeps failing on build-system since Aug 15 2017 */
    if (getenv("QTEST_VHOST_USER_FIXME")) {
        qtest_add_func("/vhost-user/reconnect/subprocess",
                       test_reconnect_subprocess);
        qtest_add_func("/vhost-user/reconnect", test_reconnect);
        qtest_add_func("/vhost-user/connect-fail/subprocess",
                       test_connect_fail_subprocess);
        qtest_add_func("/vhost-user/connect-fail", test_connect_fail);
        qtest_add_func("/vhost-user/flags-mismatch/subprocess",
                       test_flags_mismatch_subprocess);
        qtest_add_func("/vhost-user/flags-mismatch", test_flags_mismatch);
    }
#endif

    ret = g_test_run();

    /* cleanup */

    /* finish the helper thread and dispatch pending sources */
    g_main_loop_quit(loop);
    g_thread_join(thread);
    while (g_main_context_pending(NULL)) {
        g_main_context_iteration (NULL, TRUE);
    }
    g_main_loop_unref(loop);

    ret = rmdir(tmpfs);
    if (ret != 0) {
        g_test_message("unable to rmdir: path (%s): %s\n",
                       tmpfs, strerror(errno));
    }
    g_assert_cmpint(ret, ==, 0);

    return ret;
}