hw/scsi/virtio-scsi.c

   1 /*
   2  * Virtio SCSI HBA
   3  *
   4  * Copyright IBM, Corp. 2010
   5  * Copyright Red Hat, Inc. 2011
   6  *
   7  * Authors:
   8  *   Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
   9  *   Paolo Bonzini      <pbonzini@redhat.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12  * See the COPYING file in the top-level directory.
  13  *
  14  */
  15
  16 #include "hw/virtio/virtio-scsi.h"
  17 #include "qemu/error-report.h"
  18 #include <hw/scsi/scsi.h>
  19 #include <block/scsi.h>
  20 #include <hw/virtio/virtio-bus.h>
  21
  22 typedef struct VirtIOSCSIReq {
  23     VirtIOSCSI *dev;
  24     VirtQueue *vq;
  25     VirtQueueElement elem;
  26     QEMUSGList qsgl;
  27     SCSIRequest *sreq;
  28     union {
  29         char                  *buf;
  30         VirtIOSCSICmdReq      *cmd;
  31         VirtIOSCSICtrlTMFReq  *tmf;
  32         VirtIOSCSICtrlANReq   *an;
  33     } req;
  34     union {
  35         char                  *buf;
  36         VirtIOSCSICmdResp     *cmd;
  37         VirtIOSCSICtrlTMFResp *tmf;
  38         VirtIOSCSICtrlANResp  *an;
  39         VirtIOSCSIEvent       *event;
  40     } resp;
  41 } VirtIOSCSIReq;
  42
  43 static inline int virtio_scsi_get_lun(uint8_t *lun)
  44 {
  45     return ((lun[2] << 8) | lun[3]) & 0x3FFF;
  46 }
  47
  48 static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun)
  49 {
  50     if (lun[0] != 1) {
  51         return NULL;
  52     }
  53     if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) {
  54         return NULL;
  55     }
  56     return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
  57 }
  58
  59 static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
  60 {
  61     VirtIOSCSI *s = req->dev;
  62     VirtQueue *vq = req->vq;
  63     VirtIODevice *vdev = VIRTIO_DEVICE(s);
  64     virtqueue_push(vq, &req->elem, req->qsgl.size + req->elem.in_sg[0].iov_len);
  65     qemu_sglist_destroy(&req->qsgl);
  66     if (req->sreq) {
  67         req->sreq->hba_private = NULL;
  68         scsi_req_unref(req->sreq);
  69     }
  70     g_free(req);
  71     virtio_notify(vdev, vq);
  72 }
  73
  74 static void virtio_scsi_bad_req(void)
  75 {
  76     error_report("wrong size for virtio-scsi headers");
  77     exit(1);
  78 }
  79
  80 static void qemu_sgl_init_external(VirtIOSCSIReq *req, struct iovec *sg,
  81                                    hwaddr *addr, int num)
  82 {
  83     QEMUSGList *qsgl = &req->qsgl;
  84
  85     qemu_sglist_init(qsgl, DEVICE(req->dev), num, &address_space_memory);
  86     while (num--) {
  87         qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len);
  88     }
  89 }
  90
  91 static void virtio_scsi_parse_req(VirtIOSCSI *s, VirtQueue *vq,
  92                                   VirtIOSCSIReq *req)
  93 {
  94     assert(req->elem.in_num);
  95     req->vq = vq;
  96     req->dev = s;
  97     req->sreq = NULL;
  98     if (req->elem.out_num) {
  99         req->req.buf = req->elem.out_sg[0].iov_base;
 100     }
 101     req->resp.buf = req->elem.in_sg[0].iov_base;
 102
 103     if (req->elem.out_num > 1) {
 104         qemu_sgl_init_external(req, &req->elem.out_sg[1],
 105                                &req->elem.out_addr[1],
 106                                req->elem.out_num - 1);
 107     } else {
 108         qemu_sgl_init_external(req, &req->elem.in_sg[1],
 109                                &req->elem.in_addr[1],
 110                                req->elem.in_num - 1);
 111     }
 112 }
 113
 114 static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
 115 {
 116     VirtIOSCSIReq *req;
 117     req = g_malloc(sizeof(*req));
 118     if (!virtqueue_pop(vq, &req->elem)) {
 119         g_free(req);
 120         return NULL;
 121     }
 122
 123     virtio_scsi_parse_req(s, vq, req);
 124     return req;
 125 }
 126
 127 static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq)
 128 {
 129     VirtIOSCSIReq *req = sreq->hba_private;
 130     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev);
 131     uint32_t n = virtio_queue_get_id(req->vq) - 2;
 132
 133     assert(n < vs->conf.num_queues);
 134     qemu_put_be32s(f, &n);
 135     qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
 136 }
 137
 138 static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
 139 {
 140     SCSIBus *bus = sreq->bus;
 141     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 142     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
 143     VirtIOSCSIReq *req;
 144     uint32_t n;
 145
 146     req = g_malloc(sizeof(*req));
 147     qemu_get_be32s(f, &n);
 148     assert(n < vs->conf.num_queues);
 149     qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
 150     virtio_scsi_parse_req(s, vs->cmd_vqs[n], req);
 151
 152     scsi_req_ref(sreq);
 153     req->sreq = sreq;
 154     if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
 155         int req_mode =
 156             (req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
 157
 158         assert(req->sreq->cmd.mode == req_mode);
 159     }
 160     return req;
 161 }
 162
 163 static void virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
 164 {
 165     SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf->lun);
 166     SCSIRequest *r, *next;
 167     BusChild *kid;
 168     int target;
 169
 170     /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE".  */
 171     req->resp.tmf->response = VIRTIO_SCSI_S_OK;
 172
 173     switch (req->req.tmf->subtype) {
 174     case VIRTIO_SCSI_T_TMF_ABORT_TASK:
 175     case VIRTIO_SCSI_T_TMF_QUERY_TASK:
 176         if (!d) {
 177             goto fail;
 178         }
 179         if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
 180             goto incorrect_lun;
 181         }
 182         QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
 183             VirtIOSCSIReq *cmd_req = r->hba_private;
 184             if (cmd_req && cmd_req->req.cmd->tag == req->req.tmf->tag) {
 185                 break;
 186             }
 187         }
 188         if (r) {
 189             /*
 190              * Assert that the request has not been completed yet, we
 191              * check for it in the loop above.
 192              */
 193             assert(r->hba_private);
 194             if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
 195                 /* "If the specified command is present in the task set, then
 196                  * return a service response set to FUNCTION SUCCEEDED".
 197                  */
 198                 req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
 199             } else {
 200                 scsi_req_cancel(r);
 201             }
 202         }
 203         break;
 204
 205     case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
 206         if (!d) {
 207             goto fail;
 208         }
 209         if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
 210             goto incorrect_lun;
 211         }
 212         s->resetting++;
 213         qdev_reset_all(&d->qdev);
 214         s->resetting--;
 215         break;
 216
 217     case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
 218     case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
 219     case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
 220         if (!d) {
 221             goto fail;
 222         }
 223         if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
 224             goto incorrect_lun;
 225         }
 226         QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
 227             if (r->hba_private) {
 228                 if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) {
 229                     /* "If there is any command present in the task set, then
 230                      * return a service response set to FUNCTION SUCCEEDED".
 231                      */
 232                     req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
 233                     break;
 234                 } else {
 235                     scsi_req_cancel(r);
 236                 }
 237             }
 238         }
 239         break;
 240
 241     case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
 242         target = req->req.tmf->lun[1];
 243         s->resetting++;
 244         QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
 245              d = DO_UPCAST(SCSIDevice, qdev, kid->child);
 246              if (d->channel == 0 && d->id == target) {
 247                 qdev_reset_all(&d->qdev);
 248              }
 249         }
 250         s->resetting--;
 251         break;
 252
 253     case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
 254     default:
 255         req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
 256         break;
 257     }
 258
 259     return;
 260
 261 incorrect_lun:
 262     req->resp.tmf->response = VIRTIO_SCSI_S_INCORRECT_LUN;
 263     return;
 264
 265 fail:
 266     req->resp.tmf->response = VIRTIO_SCSI_S_BAD_TARGET;
 267 }
 268
 269 static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
 270 {
 271     VirtIOSCSI *s = (VirtIOSCSI *)vdev;
 272     VirtIOSCSIReq *req;
 273
 274     while ((req = virtio_scsi_pop_req(s, vq))) {
 275         int out_size, in_size;
 276         if (req->elem.out_num < 1 || req->elem.in_num < 1) {
 277             virtio_scsi_bad_req();
 278             continue;
 279         }
 280
 281         out_size = req->elem.out_sg[0].iov_len;
 282         in_size = req->elem.in_sg[0].iov_len;
 283         if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) {
 284             if (out_size < sizeof(VirtIOSCSICtrlTMFReq) ||
 285                 in_size < sizeof(VirtIOSCSICtrlTMFResp)) {
 286                 virtio_scsi_bad_req();
 287             }
 288             virtio_scsi_do_tmf(s, req);
 289
 290         } else if (req->req.tmf->type == VIRTIO_SCSI_T_AN_QUERY ||
 291                    req->req.tmf->type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
 292             if (out_size < sizeof(VirtIOSCSICtrlANReq) ||
 293                 in_size < sizeof(VirtIOSCSICtrlANResp)) {
 294                 virtio_scsi_bad_req();
 295             }
 296             req->resp.an->event_actual = 0;
 297             req->resp.an->response = VIRTIO_SCSI_S_OK;
 298         }
 299         virtio_scsi_complete_req(req);
 300     }
 301 }
 302
 303 static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
 304                                          size_t resid)
 305 {
 306     VirtIOSCSIReq *req = r->hba_private;
 307     VirtIOSCSI *s = req->dev;
 308     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
 309     uint32_t sense_len;
 310
 311     if (r->io_canceled) {
 312         return;
 313     }
 314
 315     req->resp.cmd->response = VIRTIO_SCSI_S_OK;
 316     req->resp.cmd->status = status;
 317     if (req->resp.cmd->status == GOOD) {
 318         req->resp.cmd->resid = tswap32(resid);
 319     } else {
 320         req->resp.cmd->resid = 0;
 321         sense_len = scsi_req_get_sense(r, req->resp.cmd->sense,
 322                                        vs->sense_size);
 323         req->resp.cmd->sense_len = tswap32(sense_len);
 324     }
 325     virtio_scsi_complete_req(req);
 326 }
 327
 328 static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
 329 {
 330     VirtIOSCSIReq *req = r->hba_private;
 331
 332     return &req->qsgl;
 333 }
 334
 335 static void virtio_scsi_request_cancelled(SCSIRequest *r)
 336 {
 337     VirtIOSCSIReq *req = r->hba_private;
 338
 339     if (!req) {
 340         return;
 341     }
 342     if (req->dev->resetting) {
 343         req->resp.cmd->response = VIRTIO_SCSI_S_RESET;
 344     } else {
 345         req->resp.cmd->response = VIRTIO_SCSI_S_ABORTED;
 346     }
 347     virtio_scsi_complete_req(req);
 348 }
 349
 350 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
 351 {
 352     req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE;
 353     virtio_scsi_complete_req(req);
 354 }
 355
 356 static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
 357 {
 358     /* use non-QOM casts in the data path */
 359     VirtIOSCSI *s = (VirtIOSCSI *)vdev;
 360     VirtIOSCSICommon *vs = &s->parent_obj;
 361
 362     VirtIOSCSIReq *req;
 363     int n;
 364
 365     while ((req = virtio_scsi_pop_req(s, vq))) {
 366         SCSIDevice *d;
 367         int out_size, in_size;
 368         if (req->elem.out_num < 1 || req->elem.in_num < 1) {
 369             virtio_scsi_bad_req();
 370         }
 371
 372         out_size = req->elem.out_sg[0].iov_len;
 373         in_size = req->elem.in_sg[0].iov_len;
 374         if (out_size < sizeof(VirtIOSCSICmdReq) + vs->cdb_size ||
 375             in_size < sizeof(VirtIOSCSICmdResp) + vs->sense_size) {
 376             virtio_scsi_bad_req();
 377         }
 378
 379         if (req->elem.out_num > 1 && req->elem.in_num > 1) {
 380             virtio_scsi_fail_cmd_req(req);
 381             continue;
 382         }
 383
 384         d = virtio_scsi_device_find(s, req->req.cmd->lun);
 385         if (!d) {
 386             req->resp.cmd->response = VIRTIO_SCSI_S_BAD_TARGET;
 387             virtio_scsi_complete_req(req);
 388             continue;
 389         }
 390         req->sreq = scsi_req_new(d, req->req.cmd->tag,
 391                                  virtio_scsi_get_lun(req->req.cmd->lun),
 392                                  req->req.cmd->cdb, req);
 393
 394         if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
 395             int req_mode =
 396                 (req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
 397
 398             if (req->sreq->cmd.mode != req_mode ||
 399                 req->sreq->cmd.xfer > req->qsgl.size) {
 400                 req->resp.cmd->response = VIRTIO_SCSI_S_OVERRUN;
 401                 virtio_scsi_complete_req(req);
 402                 continue;
 403             }
 404         }
 405
 406         n = scsi_req_enqueue(req->sreq);
 407         if (n) {
 408             scsi_req_continue(req->sreq);
 409         }
 410     }
 411 }
 412
 413 static void virtio_scsi_get_config(VirtIODevice *vdev,
 414                                    uint8_t *config)
 415 {
 416     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 417     VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev);
 418
 419     stl_raw(&scsiconf->num_queues, s->conf.num_queues);
 420     stl_raw(&scsiconf->seg_max, 128 - 2);
 421     stl_raw(&scsiconf->max_sectors, s->conf.max_sectors);
 422     stl_raw(&scsiconf->cmd_per_lun, s->conf.cmd_per_lun);
 423     stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
 424     stl_raw(&scsiconf->sense_size, s->sense_size);
 425     stl_raw(&scsiconf->cdb_size, s->cdb_size);
 426     stw_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
 427     stw_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
 428     stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
 429 }
 430
 431 static void virtio_scsi_set_config(VirtIODevice *vdev,
 432                                    const uint8_t *config)
 433 {
 434     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 435     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 436
 437     if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 ||
 438         (uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) {
 439         error_report("bad data written to virtio-scsi configuration space");
 440         exit(1);
 441     }
 442
 443     vs->sense_size = ldl_raw(&scsiconf->sense_size);
 444     vs->cdb_size = ldl_raw(&scsiconf->cdb_size);
 445 }
 446
 447 static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
 448                                          uint32_t requested_features)
 449 {
 450     return requested_features;
 451 }
 452
 453 static void virtio_scsi_reset(VirtIODevice *vdev)
 454 {
 455     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 456     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 457
 458     s->resetting++;
 459     qbus_reset_all(&s->bus.qbus);
 460     s->resetting--;
 461
 462     vs->sense_size = VIRTIO_SCSI_SENSE_SIZE;
 463     vs->cdb_size = VIRTIO_SCSI_CDB_SIZE;
 464     s->events_dropped = false;
 465 }
 466
 467 /* The device does not have anything to save beyond the virtio data.
 468  * Request data is saved with callbacks from SCSI devices.
 469  */
 470 static void virtio_scsi_save(QEMUFile *f, void *opaque)
 471 {
 472     VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
 473     virtio_save(vdev, f);
 474 }
 475
 476 static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
 477 {
 478     VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
 479     int ret;
 480
 481     ret = virtio_load(vdev, f);
 482     if (ret) {
 483         return ret;
 484     }
 485     return 0;
 486 }
 487
 488 static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
 489                                    uint32_t event, uint32_t reason)
 490 {
 491     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
 492     VirtIOSCSIReq *req = virtio_scsi_pop_req(s, vs->event_vq);
 493     VirtIOSCSIEvent *evt;
 494     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 495     int in_size;
 496
 497     if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 498         return;
 499     }
 500
 501     if (!req) {
 502         s->events_dropped = true;
 503         return;
 504     }
 505
 506     if (req->elem.out_num || req->elem.in_num != 1) {
 507         virtio_scsi_bad_req();
 508     }
 509
 510     if (s->events_dropped) {
 511         event |= VIRTIO_SCSI_T_EVENTS_MISSED;
 512         s->events_dropped = false;
 513     }
 514
 515     in_size = req->elem.in_sg[0].iov_len;
 516     if (in_size < sizeof(VirtIOSCSIEvent)) {
 517         virtio_scsi_bad_req();
 518     }
 519
 520     evt = req->resp.event;
 521     memset(evt, 0, sizeof(VirtIOSCSIEvent));
 522     evt->event = event;
 523     evt->reason = reason;
 524     if (!dev) {
 525         assert(event == VIRTIO_SCSI_T_EVENTS_MISSED);
 526     } else {
 527         evt->lun[0] = 1;
 528         evt->lun[1] = dev->id;
 529
 530         /* Linux wants us to keep the same encoding we use for REPORT LUNS.  */
 531         if (dev->lun >= 256) {
 532             evt->lun[2] = (dev->lun >> 8) | 0x40;
 533         }
 534         evt->lun[3] = dev->lun & 0xFF;
 535     }
 536     virtio_scsi_complete_req(req);
 537 }
 538
 539 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
 540 {
 541     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 542
 543     if (s->events_dropped) {
 544         virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
 545     }
 546 }
 547
 548 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
 549 {
 550     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 551     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 552
 553     if (((vdev->guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) &&
 554         dev->type != TYPE_ROM) {
 555         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
 556                                sense.asc | (sense.ascq << 8));
 557     }
 558 }
 559
 560 static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev)
 561 {
 562     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 563     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 564
 565     if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
 566         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
 567                                VIRTIO_SCSI_EVT_RESET_RESCAN);
 568     }
 569 }
 570
 571 static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev)
 572 {
 573     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 574     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 575
 576     if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
 577         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
 578                                VIRTIO_SCSI_EVT_RESET_REMOVED);
 579     }
 580 }
 581
 582 static struct SCSIBusInfo virtio_scsi_scsi_info = {
 583     .tcq = true,
 584     .max_channel = VIRTIO_SCSI_MAX_CHANNEL,
 585     .max_target = VIRTIO_SCSI_MAX_TARGET,
 586     .max_lun = VIRTIO_SCSI_MAX_LUN,
 587
 588     .complete = virtio_scsi_command_complete,
 589     .cancel = virtio_scsi_request_cancelled,
 590     .change = virtio_scsi_change,
 591     .hotplug = virtio_scsi_hotplug,
 592     .hot_unplug = virtio_scsi_hot_unplug,
 593     .get_sg_list = virtio_scsi_get_sg_list,
 594     .save_request = virtio_scsi_save_request,
 595     .load_request = virtio_scsi_load_request,
 596 };
 597
 598 void virtio_scsi_common_realize(DeviceState *dev, Error **errp)
 599 {
 600     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 601     VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev);
 602     int i;
 603
 604     virtio_init(vdev, "virtio-scsi", VIRTIO_ID_SCSI,
 605                 sizeof(VirtIOSCSIConfig));
 606
 607     s->cmd_vqs = g_malloc0(s->conf.num_queues * sizeof(VirtQueue *));
 608     s->sense_size = VIRTIO_SCSI_SENSE_SIZE;
 609     s->cdb_size = VIRTIO_SCSI_CDB_SIZE;
 610
 611     s->ctrl_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
 612                                   virtio_scsi_handle_ctrl);
 613     s->event_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
 614                                    virtio_scsi_handle_event);
 615     for (i = 0; i < s->conf.num_queues; i++) {
 616         s->cmd_vqs[i] = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
 617                                          virtio_scsi_handle_cmd);
 618     }
 619 }
 620
 621 static void virtio_scsi_device_realize(DeviceState *dev, Error **errp)
 622 {
 623     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 624     VirtIOSCSI *s = VIRTIO_SCSI(dev);
 625     static int virtio_scsi_id;
 626     Error *err = NULL;
 627
 628     virtio_scsi_common_realize(dev, &err);
 629     if (err != NULL) {
 630         error_propagate(errp, err);
 631         return;
 632     }
 633
 634     scsi_bus_new(&s->bus, sizeof(s->bus), dev,
 635                  &virtio_scsi_scsi_info, vdev->bus_name);
 636
 637     if (!dev->hotplugged) {
 638         scsi_bus_legacy_handle_cmdline(&s->bus, &err);
 639         if (err != NULL) {
 640             error_propagate(errp, err);
 641             return;
 642         }
 643     }
 644
 645     register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1,
 646                     virtio_scsi_save, virtio_scsi_load, s);
 647 }
 648
 649 void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp)
 650 {
 651     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 652     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
 653
 654     g_free(vs->cmd_vqs);
 655     virtio_cleanup(vdev);
 656 }
 657
 658 static void virtio_scsi_device_unrealize(DeviceState *dev, Error **errp)
 659 {
 660     VirtIOSCSI *s = VIRTIO_SCSI(dev);
 661
 662     unregister_savevm(dev, "virtio-scsi", s);
 663
 664     virtio_scsi_common_unrealize(dev, errp);
 665 }
 666
 667 static Property virtio_scsi_properties[] = {
 668     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSI, parent_obj.conf),
 669     DEFINE_PROP_END_OF_LIST(),
 670 };
 671
 672 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data)
 673 {
 674     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 675     DeviceClass *dc = DEVICE_CLASS(klass);
 676
 677     vdc->get_config = virtio_scsi_get_config;
 678     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 679 }
 680
 681 static void virtio_scsi_class_init(ObjectClass *klass, void *data)
 682 {
 683     DeviceClass *dc = DEVICE_CLASS(klass);
 684     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 685
 686     dc->props = virtio_scsi_properties;
 687     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 688     vdc->realize = virtio_scsi_device_realize;
 689     vdc->unrealize = virtio_scsi_device_unrealize;
 690     vdc->set_config = virtio_scsi_set_config;
 691     vdc->get_features = virtio_scsi_get_features;
 692     vdc->reset = virtio_scsi_reset;
 693 }
 694
 695 static const TypeInfo virtio_scsi_common_info = {
 696     .name = TYPE_VIRTIO_SCSI_COMMON,
 697     .parent = TYPE_VIRTIO_DEVICE,
 698     .instance_size = sizeof(VirtIOSCSICommon),
 699     .abstract = true,
 700     .class_init = virtio_scsi_common_class_init,
 701 };
 702
 703 static const TypeInfo virtio_scsi_info = {
 704     .name = TYPE_VIRTIO_SCSI,
 705     .parent = TYPE_VIRTIO_SCSI_COMMON,
 706     .instance_size = sizeof(VirtIOSCSI),
 707     .class_init = virtio_scsi_class_init,
 708 };
 709
 710 static void virtio_register_types(void)
 711 {
 712     type_register_static(&virtio_scsi_common_info);
 713     type_register_static(&virtio_scsi_info);
 714 }
 715
 716 type_init(virtio_register_types)