1 /* 2 * Copyright (c) 2018 Citrix Systems Inc. 3 * 4 * This work is licensed under the terms of the GNU GPL, version 2 or later. 5 * See the COPYING file in the top-level directory. 6 */ 7 8 #include "qemu/osdep.h" 9 #include "qemu/cutils.h" 10 #include "qemu/main-loop.h" 11 #include "qemu/module.h" 12 #include "qemu/option.h" 13 #include "qapi/error.h" 14 #include "qapi/qapi-commands-block-core.h" 15 #include "qapi/qapi-commands-qom.h" 16 #include "qapi/qapi-visit-block-core.h" 17 #include "qapi/qobject-input-visitor.h" 18 #include "qapi/visitor.h" 19 #include "qapi/qmp/qdict.h" 20 #include "qapi/qmp/qstring.h" 21 #include "qom/object_interfaces.h" 22 #include "hw/xen/xen_common.h" 23 #include "hw/block/xen_blkif.h" 24 #include "hw/qdev-properties.h" 25 #include "hw/xen/xen-block.h" 26 #include "hw/xen/xen-backend.h" 27 #include "sysemu/blockdev.h" 28 #include "sysemu/block-backend.h" 29 #include "sysemu/iothread.h" 30 #include "dataplane/xen-block.h" 31 #include "trace.h" 32 33 static char *xen_block_get_name(XenDevice *xendev, Error **errp) 34 { 35 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); 36 XenBlockVdev *vdev = &blockdev->props.vdev; 37 38 return g_strdup_printf("%lu", vdev->number); 39 } 40 41 static void xen_block_disconnect(XenDevice *xendev, Error **errp) 42 { 43 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); 44 const char *type = object_get_typename(OBJECT(blockdev)); 45 XenBlockVdev *vdev = &blockdev->props.vdev; 46 47 trace_xen_block_disconnect(type, vdev->disk, vdev->partition); 48 49 xen_block_dataplane_stop(blockdev->dataplane); 50 } 51 52 static void xen_block_connect(XenDevice *xendev, Error **errp) 53 { 54 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); 55 const char *type = object_get_typename(OBJECT(blockdev)); 56 XenBlockVdev *vdev = &blockdev->props.vdev; 57 BlockConf *conf = &blockdev->props.conf; 58 unsigned int feature_large_sector_size; 59 unsigned int order, nr_ring_ref, *ring_ref, event_channel, protocol; 60 char *str; 61 62 trace_xen_block_connect(type, vdev->disk, vdev->partition); 63 64 if (xen_device_frontend_scanf(xendev, "feature-large-sector-size", "%u", 65 &feature_large_sector_size) != 1) { 66 feature_large_sector_size = 0; 67 } 68 69 if (feature_large_sector_size != 1 && 70 conf->logical_block_size != XEN_BLKIF_SECTOR_SIZE) { 71 error_setg(errp, "logical_block_size != %u not supported by frontend", 72 XEN_BLKIF_SECTOR_SIZE); 73 return; 74 } 75 76 if (xen_device_frontend_scanf(xendev, "ring-page-order", "%u", 77 &order) != 1) { 78 nr_ring_ref = 1; 79 ring_ref = g_new(unsigned int, nr_ring_ref); 80 81 if (xen_device_frontend_scanf(xendev, "ring-ref", "%u", 82 &ring_ref[0]) != 1) { 83 error_setg(errp, "failed to read ring-ref"); 84 g_free(ring_ref); 85 return; 86 } 87 } else if (order <= blockdev->props.max_ring_page_order) { 88 unsigned int i; 89 90 nr_ring_ref = 1 << order; 91 ring_ref = g_new(unsigned int, nr_ring_ref); 92 93 for (i = 0; i < nr_ring_ref; i++) { 94 const char *key = g_strdup_printf("ring-ref%u", i); 95 96 if (xen_device_frontend_scanf(xendev, key, "%u", 97 &ring_ref[i]) != 1) { 98 error_setg(errp, "failed to read %s", key); 99 g_free((gpointer)key); 100 g_free(ring_ref); 101 return; 102 } 103 104 g_free((gpointer)key); 105 } 106 } else { 107 error_setg(errp, "invalid ring-page-order (%d)", order); 108 return; 109 } 110 111 if (xen_device_frontend_scanf(xendev, "event-channel", "%u", 112 &event_channel) != 1) { 113 error_setg(errp, "failed to read event-channel"); 114 g_free(ring_ref); 115 return; 116 } 117 118 if (xen_device_frontend_scanf(xendev, "protocol", "%ms", 119 &str) != 1) { 120 protocol = BLKIF_PROTOCOL_NATIVE; 121 } else { 122 if (strcmp(str, XEN_IO_PROTO_ABI_X86_32) == 0) { 123 protocol = BLKIF_PROTOCOL_X86_32; 124 } else if (strcmp(str, XEN_IO_PROTO_ABI_X86_64) == 0) { 125 protocol = BLKIF_PROTOCOL_X86_64; 126 } else { 127 protocol = BLKIF_PROTOCOL_NATIVE; 128 } 129 130 free(str); 131 } 132 133 xen_block_dataplane_start(blockdev->dataplane, ring_ref, nr_ring_ref, 134 event_channel, protocol, errp); 135 136 g_free(ring_ref); 137 } 138 139 static void xen_block_unrealize(XenDevice *xendev) 140 { 141 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); 142 XenBlockDeviceClass *blockdev_class = 143 XEN_BLOCK_DEVICE_GET_CLASS(xendev); 144 const char *type = object_get_typename(OBJECT(blockdev)); 145 XenBlockVdev *vdev = &blockdev->props.vdev; 146 147 if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) { 148 return; 149 } 150 151 trace_xen_block_unrealize(type, vdev->disk, vdev->partition); 152 153 /* Disconnect from the frontend in case this has not already happened */ 154 xen_block_disconnect(xendev, NULL); 155 156 xen_block_dataplane_destroy(blockdev->dataplane); 157 blockdev->dataplane = NULL; 158 159 if (blockdev_class->unrealize) { 160 blockdev_class->unrealize(blockdev); 161 } 162 } 163 164 static void xen_block_set_size(XenBlockDevice *blockdev) 165 { 166 const char *type = object_get_typename(OBJECT(blockdev)); 167 XenBlockVdev *vdev = &blockdev->props.vdev; 168 BlockConf *conf = &blockdev->props.conf; 169 int64_t sectors = blk_getlength(conf->blk) / conf->logical_block_size; 170 XenDevice *xendev = XEN_DEVICE(blockdev); 171 172 trace_xen_block_size(type, vdev->disk, vdev->partition, sectors); 173 174 xen_device_backend_printf(xendev, "sectors", "%"PRIi64, sectors); 175 } 176 177 static void xen_block_resize_cb(void *opaque) 178 { 179 XenBlockDevice *blockdev = opaque; 180 XenDevice *xendev = XEN_DEVICE(blockdev); 181 enum xenbus_state state = xen_device_backend_get_state(xendev); 182 183 xen_block_set_size(blockdev); 184 185 /* 186 * Mimic the behaviour of Linux xen-blkback and re-write the state 187 * to trigger the frontend watch. 188 */ 189 xen_device_backend_printf(xendev, "state", "%u", state); 190 } 191 192 static const BlockDevOps xen_block_dev_ops = { 193 .resize_cb = xen_block_resize_cb, 194 }; 195 196 static void xen_block_realize(XenDevice *xendev, Error **errp) 197 { 198 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); 199 XenBlockDeviceClass *blockdev_class = 200 XEN_BLOCK_DEVICE_GET_CLASS(xendev); 201 const char *type = object_get_typename(OBJECT(blockdev)); 202 XenBlockVdev *vdev = &blockdev->props.vdev; 203 BlockConf *conf = &blockdev->props.conf; 204 BlockBackend *blk = conf->blk; 205 Error *local_err = NULL; 206 207 if (vdev->type == XEN_BLOCK_VDEV_TYPE_INVALID) { 208 error_setg(errp, "vdev property not set"); 209 return; 210 } 211 212 trace_xen_block_realize(type, vdev->disk, vdev->partition); 213 214 if (blockdev_class->realize) { 215 blockdev_class->realize(blockdev, &local_err); 216 if (local_err) { 217 error_propagate(errp, local_err); 218 return; 219 } 220 } 221 222 /* 223 * The blkif protocol does not deal with removable media, so it must 224 * always be present, even for CDRom devices. 225 */ 226 assert(blk); 227 if (!blk_is_inserted(blk)) { 228 error_setg(errp, "device needs media, but drive is empty"); 229 return; 230 } 231 232 if (!blkconf_apply_backend_options(conf, blockdev->info & VDISK_READONLY, 233 true, errp)) { 234 return; 235 } 236 237 if (!(blockdev->info & VDISK_CDROM) && 238 !blkconf_geometry(conf, NULL, 65535, 255, 255, errp)) { 239 return; 240 } 241 242 if (!blkconf_blocksizes(conf, errp)) { 243 return; 244 } 245 246 blk_set_dev_ops(blk, &xen_block_dev_ops, blockdev); 247 blk_set_guest_block_size(blk, conf->logical_block_size); 248 249 if (conf->discard_granularity == -1) { 250 conf->discard_granularity = conf->physical_block_size; 251 } 252 253 if (blk_get_flags(blk) & BDRV_O_UNMAP) { 254 xen_device_backend_printf(xendev, "feature-discard", "%u", 1); 255 xen_device_backend_printf(xendev, "discard-granularity", "%u", 256 conf->discard_granularity); 257 } 258 259 xen_device_backend_printf(xendev, "feature-flush-cache", "%u", 1); 260 xen_device_backend_printf(xendev, "max-ring-page-order", "%u", 261 blockdev->props.max_ring_page_order); 262 xen_device_backend_printf(xendev, "info", "%u", blockdev->info); 263 264 xen_device_frontend_printf(xendev, "virtual-device", "%lu", 265 vdev->number); 266 xen_device_frontend_printf(xendev, "device-type", "%s", 267 blockdev->device_type); 268 269 xen_device_backend_printf(xendev, "sector-size", "%u", 270 conf->logical_block_size); 271 272 xen_block_set_size(blockdev); 273 274 blockdev->dataplane = 275 xen_block_dataplane_create(xendev, blk, conf->logical_block_size, 276 blockdev->props.iothread); 277 } 278 279 static void xen_block_frontend_changed(XenDevice *xendev, 280 enum xenbus_state frontend_state, 281 Error **errp) 282 { 283 enum xenbus_state backend_state = xen_device_backend_get_state(xendev); 284 Error *local_err = NULL; 285 286 switch (frontend_state) { 287 case XenbusStateInitialised: 288 case XenbusStateConnected: 289 if (backend_state == XenbusStateConnected) { 290 break; 291 } 292 293 xen_block_disconnect(xendev, &local_err); 294 if (local_err) { 295 error_propagate(errp, local_err); 296 break; 297 } 298 299 xen_block_connect(xendev, &local_err); 300 if (local_err) { 301 error_propagate(errp, local_err); 302 break; 303 } 304 305 xen_device_backend_set_state(xendev, XenbusStateConnected); 306 break; 307 308 case XenbusStateClosing: 309 xen_device_backend_set_state(xendev, XenbusStateClosing); 310 break; 311 312 case XenbusStateClosed: 313 case XenbusStateUnknown: 314 xen_block_disconnect(xendev, &local_err); 315 if (local_err) { 316 error_propagate(errp, local_err); 317 break; 318 } 319 320 xen_device_backend_set_state(xendev, XenbusStateClosed); 321 break; 322 323 default: 324 break; 325 } 326 } 327 328 static char *disk_to_vbd_name(unsigned int disk) 329 { 330 char *name, *prefix = (disk >= 26) ? 331 disk_to_vbd_name((disk / 26) - 1) : g_strdup(""); 332 333 name = g_strdup_printf("%s%c", prefix, 'a' + disk % 26); 334 g_free(prefix); 335 336 return name; 337 } 338 339 static void xen_block_get_vdev(Object *obj, Visitor *v, const char *name, 340 void *opaque, Error **errp) 341 { 342 DeviceState *dev = DEVICE(obj); 343 Property *prop = opaque; 344 XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop); 345 char *str; 346 347 switch (vdev->type) { 348 case XEN_BLOCK_VDEV_TYPE_DP: 349 str = g_strdup_printf("d%lup%lu", vdev->disk, vdev->partition); 350 break; 351 352 case XEN_BLOCK_VDEV_TYPE_XVD: 353 case XEN_BLOCK_VDEV_TYPE_HD: 354 case XEN_BLOCK_VDEV_TYPE_SD: { 355 char *name = disk_to_vbd_name(vdev->disk); 356 357 str = g_strdup_printf("%s%s%lu", 358 (vdev->type == XEN_BLOCK_VDEV_TYPE_XVD) ? 359 "xvd" : 360 (vdev->type == XEN_BLOCK_VDEV_TYPE_HD) ? 361 "hd" : 362 "sd", 363 name, vdev->partition); 364 g_free(name); 365 break; 366 } 367 default: 368 error_setg(errp, "invalid vdev type"); 369 return; 370 } 371 372 visit_type_str(v, name, &str, errp); 373 g_free(str); 374 } 375 376 static int vbd_name_to_disk(const char *name, const char **endp, 377 unsigned long *disk) 378 { 379 unsigned int n = 0; 380 381 while (*name != '\0') { 382 if (!g_ascii_isalpha(*name) || !g_ascii_islower(*name)) { 383 break; 384 } 385 386 n *= 26; 387 n += *name++ - 'a' + 1; 388 } 389 *endp = name; 390 391 if (!n) { 392 return -1; 393 } 394 395 *disk = n - 1; 396 397 return 0; 398 } 399 400 static void xen_block_set_vdev(Object *obj, Visitor *v, const char *name, 401 void *opaque, Error **errp) 402 { 403 DeviceState *dev = DEVICE(obj); 404 Property *prop = opaque; 405 XenBlockVdev *vdev = qdev_get_prop_ptr(dev, prop); 406 Error *local_err = NULL; 407 char *str, *p; 408 const char *end; 409 410 if (dev->realized) { 411 qdev_prop_set_after_realize(dev, name, errp); 412 return; 413 } 414 415 visit_type_str(v, name, &str, &local_err); 416 if (local_err) { 417 error_propagate(errp, local_err); 418 return; 419 } 420 421 p = strchr(str, 'd'); 422 if (!p) { 423 goto invalid; 424 } 425 426 *p++ = '\0'; 427 if (*str == '\0') { 428 vdev->type = XEN_BLOCK_VDEV_TYPE_DP; 429 } else if (strcmp(str, "xv") == 0) { 430 vdev->type = XEN_BLOCK_VDEV_TYPE_XVD; 431 } else if (strcmp(str, "h") == 0) { 432 vdev->type = XEN_BLOCK_VDEV_TYPE_HD; 433 } else if (strcmp(str, "s") == 0) { 434 vdev->type = XEN_BLOCK_VDEV_TYPE_SD; 435 } else { 436 goto invalid; 437 } 438 439 if (vdev->type == XEN_BLOCK_VDEV_TYPE_DP) { 440 if (qemu_strtoul(p, &end, 10, &vdev->disk)) { 441 goto invalid; 442 } 443 444 if (*end == 'p') { 445 if (*(++end) == '\0') { 446 goto invalid; 447 } 448 } 449 } else { 450 if (vbd_name_to_disk(p, &end, &vdev->disk)) { 451 goto invalid; 452 } 453 } 454 455 if (*end != '\0') { 456 p = (char *)end; 457 458 if (qemu_strtoul(p, &end, 10, &vdev->partition)) { 459 goto invalid; 460 } 461 462 if (*end != '\0') { 463 goto invalid; 464 } 465 } else { 466 vdev->partition = 0; 467 } 468 469 switch (vdev->type) { 470 case XEN_BLOCK_VDEV_TYPE_DP: 471 case XEN_BLOCK_VDEV_TYPE_XVD: 472 if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) { 473 vdev->number = (202 << 8) | (vdev->disk << 4) | 474 vdev->partition; 475 } else if (vdev->disk < (1 << 20) && vdev->partition < (1 << 8)) { 476 vdev->number = (1 << 28) | (vdev->disk << 8) | 477 vdev->partition; 478 } else { 479 goto invalid; 480 } 481 break; 482 483 case XEN_BLOCK_VDEV_TYPE_HD: 484 if ((vdev->disk == 0 || vdev->disk == 1) && 485 vdev->partition < (1 << 6)) { 486 vdev->number = (3 << 8) | (vdev->disk << 6) | vdev->partition; 487 } else if ((vdev->disk == 2 || vdev->disk == 3) && 488 vdev->partition < (1 << 6)) { 489 vdev->number = (22 << 8) | ((vdev->disk - 2) << 6) | 490 vdev->partition; 491 } else { 492 goto invalid; 493 } 494 break; 495 496 case XEN_BLOCK_VDEV_TYPE_SD: 497 if (vdev->disk < (1 << 4) && vdev->partition < (1 << 4)) { 498 vdev->number = (8 << 8) | (vdev->disk << 4) | vdev->partition; 499 } else { 500 goto invalid; 501 } 502 break; 503 504 default: 505 goto invalid; 506 } 507 508 g_free(str); 509 return; 510 511 invalid: 512 error_setg(errp, "invalid virtual disk specifier"); 513 514 vdev->type = XEN_BLOCK_VDEV_TYPE_INVALID; 515 g_free(str); 516 } 517 518 /* 519 * This property deals with 'vdev' names adhering to the Xen VBD naming 520 * scheme described in: 521 * 522 * https://xenbits.xen.org/docs/unstable/man/xen-vbd-interface.7.html 523 */ 524 const PropertyInfo xen_block_prop_vdev = { 525 .name = "str", 526 .description = "Virtual Disk specifier: d*p*/xvd*/hd*/sd*", 527 .get = xen_block_get_vdev, 528 .set = xen_block_set_vdev, 529 }; 530 531 static Property xen_block_props[] = { 532 DEFINE_PROP("vdev", XenBlockDevice, props.vdev, 533 xen_block_prop_vdev, XenBlockVdev), 534 DEFINE_BLOCK_PROPERTIES(XenBlockDevice, props.conf), 535 DEFINE_PROP_UINT32("max-ring-page-order", XenBlockDevice, 536 props.max_ring_page_order, 4), 537 DEFINE_PROP_LINK("iothread", XenBlockDevice, props.iothread, 538 TYPE_IOTHREAD, IOThread *), 539 DEFINE_PROP_END_OF_LIST() 540 }; 541 542 static void xen_block_class_init(ObjectClass *class, void *data) 543 { 544 DeviceClass *dev_class = DEVICE_CLASS(class); 545 XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class); 546 547 xendev_class->backend = "qdisk"; 548 xendev_class->device = "vbd"; 549 xendev_class->get_name = xen_block_get_name; 550 xendev_class->realize = xen_block_realize; 551 xendev_class->frontend_changed = xen_block_frontend_changed; 552 xendev_class->unrealize = xen_block_unrealize; 553 554 device_class_set_props(dev_class, xen_block_props); 555 } 556 557 static const TypeInfo xen_block_type_info = { 558 .name = TYPE_XEN_BLOCK_DEVICE, 559 .parent = TYPE_XEN_DEVICE, 560 .instance_size = sizeof(XenBlockDevice), 561 .abstract = true, 562 .class_size = sizeof(XenBlockDeviceClass), 563 .class_init = xen_block_class_init, 564 }; 565 566 static void xen_disk_unrealize(XenBlockDevice *blockdev) 567 { 568 trace_xen_disk_unrealize(); 569 } 570 571 static void xen_disk_realize(XenBlockDevice *blockdev, Error **errp) 572 { 573 BlockConf *conf = &blockdev->props.conf; 574 575 trace_xen_disk_realize(); 576 577 blockdev->device_type = "disk"; 578 579 if (!conf->blk) { 580 error_setg(errp, "drive property not set"); 581 return; 582 } 583 584 blockdev->info = blk_is_read_only(conf->blk) ? VDISK_READONLY : 0; 585 } 586 587 static void xen_disk_class_init(ObjectClass *class, void *data) 588 { 589 DeviceClass *dev_class = DEVICE_CLASS(class); 590 XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class); 591 592 blockdev_class->realize = xen_disk_realize; 593 blockdev_class->unrealize = xen_disk_unrealize; 594 595 dev_class->desc = "Xen Disk Device"; 596 } 597 598 static const TypeInfo xen_disk_type_info = { 599 .name = TYPE_XEN_DISK_DEVICE, 600 .parent = TYPE_XEN_BLOCK_DEVICE, 601 .instance_size = sizeof(XenDiskDevice), 602 .class_init = xen_disk_class_init, 603 }; 604 605 static void xen_cdrom_unrealize(XenBlockDevice *blockdev) 606 { 607 trace_xen_cdrom_unrealize(); 608 } 609 610 static void xen_cdrom_realize(XenBlockDevice *blockdev, Error **errp) 611 { 612 BlockConf *conf = &blockdev->props.conf; 613 614 trace_xen_cdrom_realize(); 615 616 blockdev->device_type = "cdrom"; 617 618 if (!conf->blk) { 619 int rc; 620 621 /* Set up an empty drive */ 622 conf->blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL); 623 624 rc = blk_attach_dev(conf->blk, DEVICE(blockdev)); 625 if (!rc) { 626 error_setg_errno(errp, -rc, "failed to create drive"); 627 return; 628 } 629 } 630 631 blockdev->info = VDISK_READONLY | VDISK_CDROM; 632 } 633 634 static void xen_cdrom_class_init(ObjectClass *class, void *data) 635 { 636 DeviceClass *dev_class = DEVICE_CLASS(class); 637 XenBlockDeviceClass *blockdev_class = XEN_BLOCK_DEVICE_CLASS(class); 638 639 blockdev_class->realize = xen_cdrom_realize; 640 blockdev_class->unrealize = xen_cdrom_unrealize; 641 642 dev_class->desc = "Xen CD-ROM Device"; 643 } 644 645 static const TypeInfo xen_cdrom_type_info = { 646 .name = TYPE_XEN_CDROM_DEVICE, 647 .parent = TYPE_XEN_BLOCK_DEVICE, 648 .instance_size = sizeof(XenCDRomDevice), 649 .class_init = xen_cdrom_class_init, 650 }; 651 652 static void xen_block_register_types(void) 653 { 654 type_register_static(&xen_block_type_info); 655 type_register_static(&xen_disk_type_info); 656 type_register_static(&xen_cdrom_type_info); 657 } 658 659 type_init(xen_block_register_types) 660 661 static void xen_block_blockdev_del(const char *node_name, Error **errp) 662 { 663 trace_xen_block_blockdev_del(node_name); 664 665 qmp_blockdev_del(node_name, errp); 666 } 667 668 static char *xen_block_blockdev_add(const char *id, QDict *qdict, 669 Error **errp) 670 { 671 const char *driver = qdict_get_try_str(qdict, "driver"); 672 BlockdevOptions *options = NULL; 673 Error *local_err = NULL; 674 char *node_name; 675 Visitor *v; 676 677 if (!driver) { 678 error_setg(errp, "no 'driver' parameter"); 679 return NULL; 680 } 681 682 node_name = g_strdup_printf("%s-%s", id, driver); 683 qdict_put_str(qdict, "node-name", node_name); 684 685 trace_xen_block_blockdev_add(node_name); 686 687 v = qobject_input_visitor_new(QOBJECT(qdict)); 688 visit_type_BlockdevOptions(v, NULL, &options, &local_err); 689 visit_free(v); 690 691 if (local_err) { 692 error_propagate(errp, local_err); 693 goto fail; 694 } 695 696 qmp_blockdev_add(options, &local_err); 697 698 if (local_err) { 699 error_propagate(errp, local_err); 700 goto fail; 701 } 702 703 qapi_free_BlockdevOptions(options); 704 705 return node_name; 706 707 fail: 708 if (options) { 709 qapi_free_BlockdevOptions(options); 710 } 711 g_free(node_name); 712 713 return NULL; 714 } 715 716 static void xen_block_drive_destroy(XenBlockDrive *drive, Error **errp) 717 { 718 char *node_name = drive->node_name; 719 720 if (node_name) { 721 Error *local_err = NULL; 722 723 xen_block_blockdev_del(node_name, &local_err); 724 if (local_err) { 725 error_propagate(errp, local_err); 726 return; 727 } 728 g_free(node_name); 729 drive->node_name = NULL; 730 } 731 g_free(drive->id); 732 g_free(drive); 733 } 734 735 static XenBlockDrive *xen_block_drive_create(const char *id, 736 const char *device_type, 737 QDict *opts, Error **errp) 738 { 739 const char *params = qdict_get_try_str(opts, "params"); 740 const char *mode = qdict_get_try_str(opts, "mode"); 741 const char *direct_io_safe = qdict_get_try_str(opts, "direct-io-safe"); 742 const char *discard_enable = qdict_get_try_str(opts, "discard-enable"); 743 char *driver = NULL; 744 char *filename = NULL; 745 XenBlockDrive *drive = NULL; 746 Error *local_err = NULL; 747 QDict *file_layer; 748 QDict *driver_layer; 749 750 if (params) { 751 char **v = g_strsplit(params, ":", 2); 752 753 if (v[1] == NULL) { 754 filename = g_strdup(v[0]); 755 driver = g_strdup("raw"); 756 } else { 757 if (strcmp(v[0], "aio") == 0) { 758 driver = g_strdup("raw"); 759 } else if (strcmp(v[0], "vhd") == 0) { 760 driver = g_strdup("vpc"); 761 } else { 762 driver = g_strdup(v[0]); 763 } 764 filename = g_strdup(v[1]); 765 } 766 767 g_strfreev(v); 768 } else { 769 error_setg(errp, "no params"); 770 goto done; 771 } 772 773 assert(filename); 774 assert(driver); 775 776 drive = g_new0(XenBlockDrive, 1); 777 drive->id = g_strdup(id); 778 779 file_layer = qdict_new(); 780 driver_layer = qdict_new(); 781 782 qdict_put_str(file_layer, "driver", "file"); 783 qdict_put_str(file_layer, "filename", filename); 784 g_free(filename); 785 786 if (mode && *mode != 'w') { 787 qdict_put_bool(file_layer, "read-only", true); 788 } 789 790 if (direct_io_safe) { 791 unsigned long value; 792 793 if (!qemu_strtoul(direct_io_safe, NULL, 2, &value) && !!value) { 794 QDict *cache_qdict = qdict_new(); 795 796 qdict_put_bool(cache_qdict, "direct", true); 797 qdict_put(file_layer, "cache", cache_qdict); 798 799 qdict_put_str(file_layer, "aio", "native"); 800 } 801 } 802 803 if (discard_enable) { 804 unsigned long value; 805 806 if (!qemu_strtoul(discard_enable, NULL, 2, &value) && !!value) { 807 qdict_put_str(file_layer, "discard", "unmap"); 808 qdict_put_str(driver_layer, "discard", "unmap"); 809 } 810 } 811 812 /* 813 * It is necessary to turn file locking off as an emulated device 814 * may have already opened the same image file. 815 */ 816 qdict_put_str(file_layer, "locking", "off"); 817 818 qdict_put_str(driver_layer, "driver", driver); 819 g_free(driver); 820 821 qdict_put(driver_layer, "file", file_layer); 822 823 g_assert(!drive->node_name); 824 drive->node_name = xen_block_blockdev_add(drive->id, driver_layer, 825 &local_err); 826 827 qobject_unref(driver_layer); 828 829 done: 830 if (local_err) { 831 error_propagate(errp, local_err); 832 xen_block_drive_destroy(drive, NULL); 833 return NULL; 834 } 835 836 return drive; 837 } 838 839 static const char *xen_block_drive_get_node_name(XenBlockDrive *drive) 840 { 841 return drive->node_name ? drive->node_name : ""; 842 } 843 844 static void xen_block_iothread_destroy(XenBlockIOThread *iothread, 845 Error **errp) 846 { 847 qmp_object_del(iothread->id, errp); 848 849 g_free(iothread->id); 850 g_free(iothread); 851 } 852 853 static XenBlockIOThread *xen_block_iothread_create(const char *id, 854 Error **errp) 855 { 856 XenBlockIOThread *iothread = g_new(XenBlockIOThread, 1); 857 Error *local_err = NULL; 858 QDict *opts; 859 QObject *ret_data = NULL; 860 861 iothread->id = g_strdup(id); 862 863 opts = qdict_new(); 864 qdict_put_str(opts, "qom-type", TYPE_IOTHREAD); 865 qdict_put_str(opts, "id", id); 866 qmp_object_add(opts, &ret_data, &local_err); 867 qobject_unref(opts); 868 qobject_unref(ret_data); 869 870 if (local_err) { 871 error_propagate(errp, local_err); 872 873 g_free(iothread->id); 874 g_free(iothread); 875 return NULL; 876 } 877 878 return iothread; 879 } 880 881 static void xen_block_device_create(XenBackendInstance *backend, 882 QDict *opts, Error **errp) 883 { 884 XenBus *xenbus = xen_backend_get_bus(backend); 885 const char *name = xen_backend_get_name(backend); 886 unsigned long number; 887 const char *vdev, *device_type; 888 XenBlockDrive *drive = NULL; 889 XenBlockIOThread *iothread = NULL; 890 XenDevice *xendev = NULL; 891 Error *local_err = NULL; 892 const char *type; 893 XenBlockDevice *blockdev; 894 895 if (qemu_strtoul(name, NULL, 10, &number)) { 896 error_setg(errp, "failed to parse name '%s'", name); 897 goto fail; 898 } 899 900 trace_xen_block_device_create(number); 901 902 vdev = qdict_get_try_str(opts, "dev"); 903 if (!vdev) { 904 error_setg(errp, "no dev parameter"); 905 goto fail; 906 } 907 908 device_type = qdict_get_try_str(opts, "device-type"); 909 if (!device_type) { 910 error_setg(errp, "no device-type parameter"); 911 goto fail; 912 } 913 914 if (!strcmp(device_type, "disk")) { 915 type = TYPE_XEN_DISK_DEVICE; 916 } else if (!strcmp(device_type, "cdrom")) { 917 type = TYPE_XEN_CDROM_DEVICE; 918 } else { 919 error_setg(errp, "invalid device-type parameter '%s'", device_type); 920 goto fail; 921 } 922 923 drive = xen_block_drive_create(vdev, device_type, opts, &local_err); 924 if (!drive) { 925 error_propagate_prepend(errp, local_err, "failed to create drive: "); 926 goto fail; 927 } 928 929 iothread = xen_block_iothread_create(vdev, &local_err); 930 if (local_err) { 931 error_propagate_prepend(errp, local_err, 932 "failed to create iothread: "); 933 goto fail; 934 } 935 936 xendev = XEN_DEVICE(qdev_new(type)); 937 blockdev = XEN_BLOCK_DEVICE(xendev); 938 939 object_property_set_str(OBJECT(xendev), vdev, "vdev", &local_err); 940 if (local_err) { 941 error_propagate_prepend(errp, local_err, "failed to set 'vdev': "); 942 goto fail; 943 } 944 945 object_property_set_str(OBJECT(xendev), 946 xen_block_drive_get_node_name(drive), "drive", 947 &local_err); 948 if (local_err) { 949 error_propagate_prepend(errp, local_err, "failed to set 'drive': "); 950 goto fail; 951 } 952 953 object_property_set_str(OBJECT(xendev), iothread->id, "iothread", 954 &local_err); 955 if (local_err) { 956 error_propagate_prepend(errp, local_err, 957 "failed to set 'iothread': "); 958 goto fail; 959 } 960 961 blockdev->iothread = iothread; 962 blockdev->drive = drive; 963 964 qdev_realize_and_unref(DEVICE(xendev), BUS(xenbus), &local_err); 965 if (local_err) { 966 error_propagate_prepend(errp, local_err, 967 "realization of device %s failed: ", 968 type); 969 goto fail; 970 } 971 972 xen_backend_set_device(backend, xendev); 973 return; 974 975 fail: 976 if (xendev) { 977 object_unparent(OBJECT(xendev)); 978 } 979 980 if (iothread) { 981 xen_block_iothread_destroy(iothread, NULL); 982 } 983 984 if (drive) { 985 xen_block_drive_destroy(drive, NULL); 986 } 987 } 988 989 static void xen_block_device_destroy(XenBackendInstance *backend, 990 Error **errp) 991 { 992 XenDevice *xendev = xen_backend_get_device(backend); 993 XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev); 994 XenBlockVdev *vdev = &blockdev->props.vdev; 995 XenBlockDrive *drive = blockdev->drive; 996 XenBlockIOThread *iothread = blockdev->iothread; 997 Error *local_err = NULL; 998 999 trace_xen_block_device_destroy(vdev->number); 1000 1001 object_unparent(OBJECT(xendev)); 1002 1003 if (iothread) { 1004 xen_block_iothread_destroy(iothread, &local_err); 1005 if (local_err) { 1006 error_propagate_prepend(errp, local_err, 1007 "failed to destroy iothread: "); 1008 return; 1009 } 1010 } 1011 1012 if (drive) { 1013 xen_block_drive_destroy(drive, &local_err); 1014 if (local_err) { 1015 error_propagate_prepend(errp, local_err, 1016 "failed to destroy drive: "); 1017 return; 1018 } 1019 } 1020 } 1021 1022 static const XenBackendInfo xen_block_backend_info = { 1023 .type = "qdisk", 1024 .create = xen_block_device_create, 1025 .destroy = xen_block_device_destroy, 1026 }; 1027 1028 static void xen_block_register_backend(void) 1029 { 1030 xen_backend_register(&xen_block_backend_info); 1031 } 1032 1033 xen_backend_init(xen_block_register_backend); 1034