tests/virtio-9p-test.c

   1 /*
   2  * QTest testcase for VirtIO 9P
   3  *
   4  * Copyright (c) 2014 SUSE LINUX Products GmbH
   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 #include "qemu/osdep.h"
  11 #include "libqtest.h"
  12 #include "qemu-common.h"
  13 #include "libqos/libqos-pc.h"
  14 #include "libqos/libqos-spapr.h"
  15 #include "libqos/virtio.h"
  16 #include "libqos/virtio-pci.h"
  17 #include "standard-headers/linux/virtio_ids.h"
  18 #include "standard-headers/linux/virtio_pci.h"
  19 #include "hw/9pfs/9p.h"
  20 #include "hw/9pfs/9p-synth.h"
  21
  22 #define QVIRTIO_9P_TIMEOUT_US (10 * 1000 * 1000)
  23
  24 static const char mount_tag[] = "qtest";
  25
  26 typedef struct {
  27     QVirtioDevice *dev;
  28     QOSState *qs;
  29     QVirtQueue *vq;
  30 } QVirtIO9P;
  31
  32 static QVirtIO9P *qvirtio_9p_start(const char *driver)
  33 {
  34     const char *arch = qtest_get_arch();
  35     const char *cmd = "-fsdev synth,id=fsdev0 "
  36                       "-device %s,fsdev=fsdev0,mount_tag=%s";
  37     QVirtIO9P *v9p = g_new0(QVirtIO9P, 1);
  38
  39     if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
  40         v9p->qs = qtest_pc_boot(cmd, driver, mount_tag);
  41     } else if (strcmp(arch, "ppc64") == 0) {
  42         v9p->qs = qtest_spapr_boot(cmd, driver, mount_tag);
  43     } else {
  44         g_printerr("virtio-9p tests are only available on x86 or ppc64\n");
  45         exit(EXIT_FAILURE);
  46     }
  47     global_qtest = v9p->qs->qts;
  48
  49     return v9p;
  50 }
  51
  52 static void qvirtio_9p_stop(QVirtIO9P *v9p)
  53 {
  54     qtest_shutdown(v9p->qs);
  55     g_free(v9p);
  56 }
  57
  58 static QVirtIO9P *qvirtio_9p_pci_start(void)
  59 {
  60     QVirtIO9P *v9p = qvirtio_9p_start("virtio-9p-pci");
  61     QVirtioPCIDevice *dev = qvirtio_pci_device_find(v9p->qs->pcibus,
  62                                                     VIRTIO_ID_9P);
  63     g_assert_nonnull(dev);
  64     g_assert_cmphex(dev->vdev.device_type, ==, VIRTIO_ID_9P);
  65     v9p->dev = (QVirtioDevice *) dev;
  66
  67     qvirtio_pci_device_enable(dev);
  68     qvirtio_reset(v9p->dev);
  69     qvirtio_set_acknowledge(v9p->dev);
  70     qvirtio_set_driver(v9p->dev);
  71
  72     v9p->vq = qvirtqueue_setup(v9p->dev, v9p->qs->alloc, 0);
  73
  74     qvirtio_set_driver_ok(v9p->dev);
  75
  76     return v9p;
  77 }
  78
  79 static void qvirtio_9p_pci_stop(QVirtIO9P *v9p)
  80 {
  81     qvirtqueue_cleanup(v9p->dev->bus, v9p->vq, v9p->qs->alloc);
  82     qvirtio_pci_device_disable(container_of(v9p->dev, QVirtioPCIDevice, vdev));
  83     qvirtio_pci_device_free((QVirtioPCIDevice *)v9p->dev);
  84     qvirtio_9p_stop(v9p);
  85 }
  86
  87 static void pci_config(QVirtIO9P *v9p)
  88 {
  89     size_t tag_len = qvirtio_config_readw(v9p->dev, 0);
  90     char *tag;
  91     int i;
  92
  93     g_assert_cmpint(tag_len, ==, strlen(mount_tag));
  94
  95     tag = g_malloc(tag_len);
  96     for (i = 0; i < tag_len; i++) {
  97         tag[i] = qvirtio_config_readb(v9p->dev, i + 2);
  98     }
  99     g_assert_cmpmem(tag, tag_len, mount_tag, tag_len);
 100     g_free(tag);
 101 }
 102
 103 #define P9_MAX_SIZE 4096 /* Max size of a T-message or R-message */
 104
 105 typedef struct {
 106     QVirtIO9P *v9p;
 107     uint16_t tag;
 108     uint64_t t_msg;
 109     uint32_t t_size;
 110     uint64_t r_msg;
 111     /* No r_size, it is hardcoded to P9_MAX_SIZE */
 112     size_t t_off;
 113     size_t r_off;
 114     uint32_t free_head;
 115 } P9Req;
 116
 117 static void v9fs_memwrite(P9Req *req, const void *addr, size_t len)
 118 {
 119     memwrite(req->t_msg + req->t_off, addr, len);
 120     req->t_off += len;
 121 }
 122
 123 static void v9fs_memskip(P9Req *req, size_t len)
 124 {
 125     req->r_off += len;
 126 }
 127
 128 static void v9fs_memread(P9Req *req, void *addr, size_t len)
 129 {
 130     memread(req->r_msg + req->r_off, addr, len);
 131     req->r_off += len;
 132 }
 133
 134 static void v9fs_uint16_write(P9Req *req, uint16_t val)
 135 {
 136     uint16_t le_val = cpu_to_le16(val);
 137
 138     v9fs_memwrite(req, &le_val, 2);
 139 }
 140
 141 static void v9fs_uint16_read(P9Req *req, uint16_t *val)
 142 {
 143     v9fs_memread(req, val, 2);
 144     le16_to_cpus(val);
 145 }
 146
 147 static void v9fs_uint32_write(P9Req *req, uint32_t val)
 148 {
 149     uint32_t le_val = cpu_to_le32(val);
 150
 151     v9fs_memwrite(req, &le_val, 4);
 152 }
 153
 154 static void v9fs_uint64_write(P9Req *req, uint64_t val)
 155 {
 156     uint64_t le_val = cpu_to_le64(val);
 157
 158     v9fs_memwrite(req, &le_val, 8);
 159 }
 160
 161 static void v9fs_uint32_read(P9Req *req, uint32_t *val)
 162 {
 163     v9fs_memread(req, val, 4);
 164     le32_to_cpus(val);
 165 }
 166
 167 /* len[2] string[len] */
 168 static uint16_t v9fs_string_size(const char *string)
 169 {
 170     size_t len = strlen(string);
 171
 172     g_assert_cmpint(len, <=, UINT16_MAX - 2);
 173
 174     return 2 + len;
 175 }
 176
 177 static void v9fs_string_write(P9Req *req, const char *string)
 178 {
 179     int len = strlen(string);
 180
 181     g_assert_cmpint(len, <=, UINT16_MAX);
 182
 183     v9fs_uint16_write(req, (uint16_t) len);
 184     v9fs_memwrite(req, string, len);
 185 }
 186
 187 static void v9fs_string_read(P9Req *req, uint16_t *len, char **string)
 188 {
 189     uint16_t local_len;
 190
 191     v9fs_uint16_read(req, &local_len);
 192     if (len) {
 193         *len = local_len;
 194     }
 195     if (string) {
 196         *string = g_malloc(local_len);
 197         v9fs_memread(req, *string, local_len);
 198     } else {
 199         v9fs_memskip(req, local_len);
 200     }
 201 }
 202
 203  typedef struct {
 204     uint32_t size;
 205     uint8_t id;
 206     uint16_t tag;
 207 } QEMU_PACKED P9Hdr;
 208
 209 static P9Req *v9fs_req_init(QVirtIO9P *v9p, uint32_t size, uint8_t id,
 210                             uint16_t tag)
 211 {
 212     P9Req *req = g_new0(P9Req, 1);
 213     uint32_t total_size = 7; /* 9P header has well-known size of 7 bytes */
 214     P9Hdr hdr = {
 215         .id = id,
 216         .tag = cpu_to_le16(tag)
 217     };
 218
 219     g_assert_cmpint(total_size, <=, UINT32_MAX - size);
 220     total_size += size;
 221     hdr.size = cpu_to_le32(total_size);
 222
 223     g_assert_cmpint(total_size, <=, P9_MAX_SIZE);
 224
 225     req->v9p = v9p;
 226     req->t_size = total_size;
 227     req->t_msg = guest_alloc(v9p->qs->alloc, req->t_size);
 228     v9fs_memwrite(req, &hdr, 7);
 229     req->tag = tag;
 230     return req;
 231 }
 232
 233 static void v9fs_req_send(P9Req *req)
 234 {
 235     QVirtIO9P *v9p = req->v9p;
 236
 237     req->r_msg = guest_alloc(v9p->qs->alloc, P9_MAX_SIZE);
 238     req->free_head = qvirtqueue_add(v9p->vq, req->t_msg, req->t_size, false,
 239                                     true);
 240     qvirtqueue_add(v9p->vq, req->r_msg, P9_MAX_SIZE, true, false);
 241     qvirtqueue_kick(v9p->dev, v9p->vq, req->free_head);
 242     req->t_off = 0;
 243 }
 244
 245 static const char *rmessage_name(uint8_t id)
 246 {
 247     return
 248         id == P9_RLERROR ? "RLERROR" :
 249         id == P9_RVERSION ? "RVERSION" :
 250         id == P9_RATTACH ? "RATTACH" :
 251         id == P9_RWALK ? "RWALK" :
 252         id == P9_RLOPEN ? "RLOPEN" :
 253         id == P9_RWRITE ? "RWRITE" :
 254         id == P9_RFLUSH ? "RFLUSH" :
 255         "<unknown>";
 256 }
 257
 258 static void v9fs_req_wait_for_reply(P9Req *req, uint32_t *len)
 259 {
 260     QVirtIO9P *v9p = req->v9p;
 261
 262     qvirtio_wait_used_elem(v9p->dev, v9p->vq, req->free_head, len,
 263                            QVIRTIO_9P_TIMEOUT_US);
 264 }
 265
 266 static void v9fs_req_recv(P9Req *req, uint8_t id)
 267 {
 268     P9Hdr hdr;
 269
 270     v9fs_memread(req, &hdr, 7);
 271     hdr.size = ldl_le_p(&hdr.size);
 272     hdr.tag = lduw_le_p(&hdr.tag);
 273
 274     g_assert_cmpint(hdr.size, >=, 7);
 275     g_assert_cmpint(hdr.size, <=, P9_MAX_SIZE);
 276     g_assert_cmpint(hdr.tag, ==, req->tag);
 277
 278     if (hdr.id != id) {
 279         g_printerr("Received response %d (%s) instead of %d (%s)\n",
 280                    hdr.id, rmessage_name(hdr.id), id, rmessage_name(id));
 281
 282         if (hdr.id == P9_RLERROR) {
 283             uint32_t err;
 284             v9fs_uint32_read(req, &err);
 285             g_printerr("Rlerror has errno %d (%s)\n", err, strerror(err));
 286         }
 287     }
 288     g_assert_cmpint(hdr.id, ==, id);
 289 }
 290
 291 static void v9fs_req_free(P9Req *req)
 292 {
 293     QVirtIO9P *v9p = req->v9p;
 294
 295     guest_free(v9p->qs->alloc, req->t_msg);
 296     guest_free(v9p->qs->alloc, req->r_msg);
 297     g_free(req);
 298 }
 299
 300 /* size[4] Rlerror tag[2] ecode[4] */
 301 static void v9fs_rlerror(P9Req *req, uint32_t *err)
 302 {
 303     v9fs_req_recv(req, P9_RLERROR);
 304     v9fs_uint32_read(req, err);
 305     v9fs_req_free(req);
 306 }
 307
 308 /* size[4] Tversion tag[2] msize[4] version[s] */
 309 static P9Req *v9fs_tversion(QVirtIO9P *v9p, uint32_t msize, const char *version,
 310                             uint16_t tag)
 311 {
 312     P9Req *req;
 313     uint32_t body_size = 4;
 314     uint16_t string_size = v9fs_string_size(version);
 315
 316     g_assert_cmpint(body_size, <=, UINT32_MAX - string_size);
 317     body_size += string_size;
 318     req = v9fs_req_init(v9p, body_size, P9_TVERSION, tag);
 319
 320     v9fs_uint32_write(req, msize);
 321     v9fs_string_write(req, version);
 322     v9fs_req_send(req);
 323     return req;
 324 }
 325
 326 /* size[4] Rversion tag[2] msize[4] version[s] */
 327 static void v9fs_rversion(P9Req *req, uint16_t *len, char **version)
 328 {
 329     uint32_t msize;
 330
 331     v9fs_req_recv(req, P9_RVERSION);
 332     v9fs_uint32_read(req, &msize);
 333
 334     g_assert_cmpint(msize, ==, P9_MAX_SIZE);
 335
 336     if (len || version) {
 337         v9fs_string_read(req, len, version);
 338     }
 339
 340     v9fs_req_free(req);
 341 }
 342
 343 /* size[4] Tattach tag[2] fid[4] afid[4] uname[s] aname[s] n_uname[4] */
 344 static P9Req *v9fs_tattach(QVirtIO9P *v9p, uint32_t fid, uint32_t n_uname,
 345                            uint16_t tag)
 346 {
 347     const char *uname = ""; /* ignored by QEMU */
 348     const char *aname = ""; /* ignored by QEMU */
 349     P9Req *req = v9fs_req_init(v9p, 4 + 4 + 2 + 2 + 4, P9_TATTACH, tag);
 350
 351     v9fs_uint32_write(req, fid);
 352     v9fs_uint32_write(req, P9_NOFID);
 353     v9fs_string_write(req, uname);
 354     v9fs_string_write(req, aname);
 355     v9fs_uint32_write(req, n_uname);
 356     v9fs_req_send(req);
 357     return req;
 358 }
 359
 360 typedef char v9fs_qid[13];
 361
 362 /* size[4] Rattach tag[2] qid[13] */
 363 static void v9fs_rattach(P9Req *req, v9fs_qid *qid)
 364 {
 365     v9fs_req_recv(req, P9_RATTACH);
 366     if (qid) {
 367         v9fs_memread(req, qid, 13);
 368     }
 369     v9fs_req_free(req);
 370 }
 371
 372 /* size[4] Twalk tag[2] fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
 373 static P9Req *v9fs_twalk(QVirtIO9P *v9p, uint32_t fid, uint32_t newfid,
 374                          uint16_t nwname, char *const wnames[], uint16_t tag)
 375 {
 376     P9Req *req;
 377     int i;
 378     uint32_t body_size = 4 + 4 + 2;
 379
 380     for (i = 0; i < nwname; i++) {
 381         uint16_t wname_size = v9fs_string_size(wnames[i]);
 382
 383         g_assert_cmpint(body_size, <=, UINT32_MAX - wname_size);
 384         body_size += wname_size;
 385     }
 386     req = v9fs_req_init(v9p,  body_size, P9_TWALK, tag);
 387     v9fs_uint32_write(req, fid);
 388     v9fs_uint32_write(req, newfid);
 389     v9fs_uint16_write(req, nwname);
 390     for (i = 0; i < nwname; i++) {
 391         v9fs_string_write(req, wnames[i]);
 392     }
 393     v9fs_req_send(req);
 394     return req;
 395 }
 396
 397 /* size[4] Rwalk tag[2] nwqid[2] nwqid*(wqid[13]) */
 398 static void v9fs_rwalk(P9Req *req, uint16_t *nwqid, v9fs_qid **wqid)
 399 {
 400     uint16_t local_nwqid;
 401
 402     v9fs_req_recv(req, P9_RWALK);
 403     v9fs_uint16_read(req, &local_nwqid);
 404     if (nwqid) {
 405         *nwqid = local_nwqid;
 406     }
 407     if (wqid) {
 408         *wqid = g_malloc(local_nwqid * 13);
 409         v9fs_memread(req, *wqid, local_nwqid * 13);
 410     }
 411     v9fs_req_free(req);
 412 }
 413
 414 /* size[4] Tlopen tag[2] fid[4] flags[4] */
 415 static P9Req *v9fs_tlopen(QVirtIO9P *v9p, uint32_t fid, uint32_t flags,
 416                           uint16_t tag)
 417 {
 418     P9Req *req;
 419
 420     req = v9fs_req_init(v9p,  4 + 4, P9_TLOPEN, tag);
 421     v9fs_uint32_write(req, fid);
 422     v9fs_uint32_write(req, flags);
 423     v9fs_req_send(req);
 424     return req;
 425 }
 426
 427 /* size[4] Rlopen tag[2] qid[13] iounit[4] */
 428 static void v9fs_rlopen(P9Req *req, v9fs_qid *qid, uint32_t *iounit)
 429 {
 430     v9fs_req_recv(req, P9_RLOPEN);
 431     if (qid) {
 432         v9fs_memread(req, qid, 13);
 433     } else {
 434         v9fs_memskip(req, 13);
 435     }
 436     if (iounit) {
 437         v9fs_uint32_read(req, iounit);
 438     }
 439     v9fs_req_free(req);
 440 }
 441
 442 /* size[4] Twrite tag[2] fid[4] offset[8] count[4] data[count] */
 443 static P9Req *v9fs_twrite(QVirtIO9P *v9p, uint32_t fid, uint64_t offset,
 444                           uint32_t count, const void *data, uint16_t tag)
 445 {
 446     P9Req *req;
 447     uint32_t body_size = 4 + 8 + 4;
 448
 449     g_assert_cmpint(body_size, <=, UINT32_MAX - count);
 450     body_size += count;
 451     req = v9fs_req_init(v9p,  body_size, P9_TWRITE, tag);
 452     v9fs_uint32_write(req, fid);
 453     v9fs_uint64_write(req, offset);
 454     v9fs_uint32_write(req, count);
 455     v9fs_memwrite(req, data, count);
 456     v9fs_req_send(req);
 457     return req;
 458 }
 459
 460 /* size[4] Rwrite tag[2] count[4] */
 461 static void v9fs_rwrite(P9Req *req, uint32_t *count)
 462 {
 463     v9fs_req_recv(req, P9_RWRITE);
 464     if (count) {
 465         v9fs_uint32_read(req, count);
 466     }
 467     v9fs_req_free(req);
 468 }
 469
 470 /* size[4] Tflush tag[2] oldtag[2] */
 471 static P9Req *v9fs_tflush(QVirtIO9P *v9p, uint16_t oldtag, uint16_t tag)
 472 {
 473     P9Req *req;
 474
 475     req = v9fs_req_init(v9p,  2, P9_TFLUSH, tag);
 476     v9fs_uint32_write(req, oldtag);
 477     v9fs_req_send(req);
 478     return req;
 479 }
 480
 481 /* size[4] Rflush tag[2] */
 482 static void v9fs_rflush(P9Req *req)
 483 {
 484     v9fs_req_recv(req, P9_RFLUSH);
 485     v9fs_req_free(req);
 486 }
 487
 488 static void fs_version(QVirtIO9P *v9p)
 489 {
 490     const char *version = "9P2000.L";
 491     uint16_t server_len;
 492     char *server_version;
 493     P9Req *req;
 494
 495     req = v9fs_tversion(v9p, P9_MAX_SIZE, version, P9_NOTAG);
 496     v9fs_req_wait_for_reply(req, NULL);
 497     v9fs_rversion(req, &server_len, &server_version);
 498
 499     g_assert_cmpmem(server_version, server_len, version, strlen(version));
 500
 501     g_free(server_version);
 502 }
 503
 504 static void fs_attach(QVirtIO9P *v9p)
 505 {
 506     P9Req *req;
 507
 508     fs_version(v9p);
 509     req = v9fs_tattach(v9p, 0, getuid(), 0);
 510     v9fs_req_wait_for_reply(req, NULL);
 511     v9fs_rattach(req, NULL);
 512 }
 513
 514 static void fs_walk(QVirtIO9P *v9p)
 515 {
 516     char *wnames[P9_MAXWELEM];
 517     uint16_t nwqid;
 518     v9fs_qid *wqid;
 519     int i;
 520     P9Req *req;
 521
 522     for (i = 0; i < P9_MAXWELEM; i++) {
 523         wnames[i] = g_strdup_printf(QTEST_V9FS_SYNTH_WALK_FILE, i);
 524     }
 525
 526     fs_attach(v9p);
 527     req = v9fs_twalk(v9p, 0, 1, P9_MAXWELEM, wnames, 0);
 528     v9fs_req_wait_for_reply(req, NULL);
 529     v9fs_rwalk(req, &nwqid, &wqid);
 530
 531     g_assert_cmpint(nwqid, ==, P9_MAXWELEM);
 532
 533     for (i = 0; i < P9_MAXWELEM; i++) {
 534         g_free(wnames[i]);
 535     }
 536
 537     g_free(wqid);
 538 }
 539
 540 static void fs_walk_no_slash(QVirtIO9P *v9p)
 541 {
 542     char *const wnames[] = { g_strdup(" /") };
 543     P9Req *req;
 544     uint32_t err;
 545
 546     fs_attach(v9p);
 547     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
 548     v9fs_req_wait_for_reply(req, NULL);
 549     v9fs_rlerror(req, &err);
 550
 551     g_assert_cmpint(err, ==, ENOENT);
 552
 553     g_free(wnames[0]);
 554 }
 555
 556 static void fs_walk_dotdot(QVirtIO9P *v9p)
 557 {
 558     char *const wnames[] = { g_strdup("..") };
 559     v9fs_qid root_qid, *wqid;
 560     P9Req *req;
 561
 562     fs_version(v9p);
 563     req = v9fs_tattach(v9p, 0, getuid(), 0);
 564     v9fs_req_wait_for_reply(req, NULL);
 565     v9fs_rattach(req, &root_qid);
 566
 567     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
 568     v9fs_req_wait_for_reply(req, NULL);
 569     v9fs_rwalk(req, NULL, &wqid); /* We now we'll get one qid */
 570
 571     g_assert_cmpmem(&root_qid, 13, wqid[0], 13);
 572
 573     g_free(wqid);
 574     g_free(wnames[0]);
 575 }
 576
 577 static void fs_lopen(QVirtIO9P *v9p)
 578 {
 579     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_LOPEN_FILE) };
 580     P9Req *req;
 581
 582     fs_attach(v9p);
 583     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
 584     v9fs_req_wait_for_reply(req, NULL);
 585     v9fs_rwalk(req, NULL, NULL);
 586
 587     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
 588     v9fs_req_wait_for_reply(req, NULL);
 589     v9fs_rlopen(req, NULL, NULL);
 590
 591     g_free(wnames[0]);
 592 }
 593
 594 static void fs_write(QVirtIO9P *v9p)
 595 {
 596     static const uint32_t write_count = P9_MAX_SIZE / 2;
 597     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_WRITE_FILE) };
 598     char *buf = g_malloc0(write_count);
 599     uint32_t count;
 600     P9Req *req;
 601
 602     fs_attach(v9p);
 603     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
 604     v9fs_req_wait_for_reply(req, NULL);
 605     v9fs_rwalk(req, NULL, NULL);
 606
 607     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
 608     v9fs_req_wait_for_reply(req, NULL);
 609     v9fs_rlopen(req, NULL, NULL);
 610
 611     req = v9fs_twrite(v9p, 1, 0, write_count, buf, 0);
 612     v9fs_req_wait_for_reply(req, NULL);
 613     v9fs_rwrite(req, &count);
 614     g_assert_cmpint(count, ==, write_count);
 615
 616     g_free(buf);
 617     g_free(wnames[0]);
 618 }
 619
 620 static void fs_flush_success(QVirtIO9P *v9p)
 621 {
 622     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_FLUSH_FILE) };
 623     P9Req *req, *flush_req;
 624     uint32_t reply_len;
 625     uint8_t should_block;
 626
 627     fs_attach(v9p);
 628     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
 629     v9fs_req_wait_for_reply(req, NULL);
 630     v9fs_rwalk(req, NULL, NULL);
 631
 632     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
 633     v9fs_req_wait_for_reply(req, NULL);
 634     v9fs_rlopen(req, NULL, NULL);
 635
 636     /* This will cause the 9p server to try to write data to the backend,
 637      * until the write request gets cancelled.
 638      */
 639     should_block = 1;
 640     req = v9fs_twrite(v9p, 1, 0, sizeof(should_block), &should_block, 0);
 641
 642     flush_req = v9fs_tflush(v9p, req->tag, 1);
 643
 644     /* The write request is supposed to be flushed: the server should just
 645      * mark the write request as used and reply to the flush request.
 646      */
 647     v9fs_req_wait_for_reply(req, &reply_len);
 648     g_assert_cmpint(reply_len, ==, 0);
 649     v9fs_req_free(req);
 650     v9fs_rflush(flush_req);
 651
 652     g_free(wnames[0]);
 653 }
 654
 655 static void fs_flush_ignored(QVirtIO9P *v9p)
 656 {
 657     char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_FLUSH_FILE) };
 658     P9Req *req, *flush_req;
 659     uint32_t count;
 660     uint8_t should_block;
 661
 662     fs_attach(v9p);
 663     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
 664     v9fs_req_wait_for_reply(req, NULL);
 665     v9fs_rwalk(req, NULL, NULL);
 666
 667     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
 668     v9fs_req_wait_for_reply(req, NULL);
 669     v9fs_rlopen(req, NULL, NULL);
 670
 671     /* This will cause the write request to complete right away, before it
 672      * could be actually cancelled.
 673      */
 674     should_block = 0;
 675     req = v9fs_twrite(v9p, 1, 0, sizeof(should_block), &should_block, 0);
 676
 677     flush_req = v9fs_tflush(v9p, req->tag, 1);
 678
 679     /* The write request is supposed to complete. The server should
 680      * reply to the write request and the flush request.
 681      */
 682     v9fs_req_wait_for_reply(req, NULL);
 683     v9fs_rwrite(req, &count);
 684     g_assert_cmpint(count, ==, sizeof(should_block));
 685     v9fs_rflush(flush_req);
 686
 687     g_free(wnames[0]);
 688 }
 689
 690 typedef void (*v9fs_test_fn)(QVirtIO9P *v9p);
 691
 692 static void v9fs_run_pci_test(gconstpointer data)
 693 {
 694     v9fs_test_fn fn = data;
 695     QVirtIO9P *v9p = qvirtio_9p_pci_start();
 696
 697     if (fn) {
 698         fn(v9p);
 699     }
 700     qvirtio_9p_pci_stop(v9p);
 701 }
 702
 703 static void v9fs_qtest_pci_add(const char *path, v9fs_test_fn fn)
 704 {
 705     qtest_add_data_func(path, fn, v9fs_run_pci_test);
 706 }
 707
 708 int main(int argc, char **argv)
 709 {
 710     g_test_init(&argc, &argv, NULL);
 711     v9fs_qtest_pci_add("/virtio/9p/pci/nop", NULL);
 712     v9fs_qtest_pci_add("/virtio/9p/pci/config", pci_config);
 713     v9fs_qtest_pci_add("/virtio/9p/pci/fs/version/basic", fs_version);
 714     v9fs_qtest_pci_add("/virtio/9p/pci/fs/attach/basic", fs_attach);
 715     v9fs_qtest_pci_add("/virtio/9p/pci/fs/walk/basic", fs_walk);
 716     v9fs_qtest_pci_add("/virtio/9p/pci/fs/walk/no_slash", fs_walk_no_slash);
 717     v9fs_qtest_pci_add("/virtio/9p/pci/fs/walk/dotdot_from_root",
 718                        fs_walk_dotdot);
 719     v9fs_qtest_pci_add("/virtio/9p/pci/fs/lopen/basic", fs_lopen);
 720     v9fs_qtest_pci_add("/virtio/9p/pci/fs/write/basic", fs_write);
 721     v9fs_qtest_pci_add("/virtio/9p/pci/fs/flush/success", fs_flush_success);
 722     v9fs_qtest_pci_add("/virtio/9p/pci/fs/flush/ignored", fs_flush_ignored);
 723
 724     return g_test_run();
 725 }