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     uint32_t sense_len;
 308
 309     req->resp.cmd->response = VIRTIO_SCSI_S_OK;
 310     req->resp.cmd->status = status;
 311     if (req->resp.cmd->status == GOOD) {
 312         req->resp.cmd->resid = tswap32(resid);
 313     } else {
 314         req->resp.cmd->resid = 0;
 315         sense_len = scsi_req_get_sense(r, req->resp.cmd->sense,
 316                                        VIRTIO_SCSI_SENSE_SIZE);
 317         req->resp.cmd->sense_len = tswap32(sense_len);
 318     }
 319     virtio_scsi_complete_req(req);
 320 }
 321
 322 static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
 323 {
 324     VirtIOSCSIReq *req = r->hba_private;
 325
 326     return &req->qsgl;
 327 }
 328
 329 static void virtio_scsi_request_cancelled(SCSIRequest *r)
 330 {
 331     VirtIOSCSIReq *req = r->hba_private;
 332
 333     if (!req) {
 334         return;
 335     }
 336     if (req->dev->resetting) {
 337         req->resp.cmd->response = VIRTIO_SCSI_S_RESET;
 338     } else {
 339         req->resp.cmd->response = VIRTIO_SCSI_S_ABORTED;
 340     }
 341     virtio_scsi_complete_req(req);
 342 }
 343
 344 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
 345 {
 346     req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE;
 347     virtio_scsi_complete_req(req);
 348 }
 349
 350 static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
 351 {
 352     /* use non-QOM casts in the data path */
 353     VirtIOSCSI *s = (VirtIOSCSI *)vdev;
 354     VirtIOSCSICommon *vs = &s->parent_obj;
 355
 356     VirtIOSCSIReq *req;
 357     int n;
 358
 359     while ((req = virtio_scsi_pop_req(s, vq))) {
 360         SCSIDevice *d;
 361         int out_size, in_size;
 362         if (req->elem.out_num < 1 || req->elem.in_num < 1) {
 363             virtio_scsi_bad_req();
 364         }
 365
 366         out_size = req->elem.out_sg[0].iov_len;
 367         in_size = req->elem.in_sg[0].iov_len;
 368         if (out_size < sizeof(VirtIOSCSICmdReq) + vs->cdb_size ||
 369             in_size < sizeof(VirtIOSCSICmdResp) + vs->sense_size) {
 370             virtio_scsi_bad_req();
 371         }
 372
 373         if (req->elem.out_num > 1 && req->elem.in_num > 1) {
 374             virtio_scsi_fail_cmd_req(req);
 375             continue;
 376         }
 377
 378         d = virtio_scsi_device_find(s, req->req.cmd->lun);
 379         if (!d) {
 380             req->resp.cmd->response = VIRTIO_SCSI_S_BAD_TARGET;
 381             virtio_scsi_complete_req(req);
 382             continue;
 383         }
 384         req->sreq = scsi_req_new(d, req->req.cmd->tag,
 385                                  virtio_scsi_get_lun(req->req.cmd->lun),
 386                                  req->req.cmd->cdb, req);
 387
 388         if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
 389             int req_mode =
 390                 (req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
 391
 392             if (req->sreq->cmd.mode != req_mode ||
 393                 req->sreq->cmd.xfer > req->qsgl.size) {
 394                 req->resp.cmd->response = VIRTIO_SCSI_S_OVERRUN;
 395                 virtio_scsi_complete_req(req);
 396                 continue;
 397             }
 398         }
 399
 400         n = scsi_req_enqueue(req->sreq);
 401         if (n) {
 402             scsi_req_continue(req->sreq);
 403         }
 404     }
 405 }
 406
 407 static void virtio_scsi_get_config(VirtIODevice *vdev,
 408                                    uint8_t *config)
 409 {
 410     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 411     VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev);
 412
 413     stl_raw(&scsiconf->num_queues, s->conf.num_queues);
 414     stl_raw(&scsiconf->seg_max, 128 - 2);
 415     stl_raw(&scsiconf->max_sectors, s->conf.max_sectors);
 416     stl_raw(&scsiconf->cmd_per_lun, s->conf.cmd_per_lun);
 417     stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
 418     stl_raw(&scsiconf->sense_size, s->sense_size);
 419     stl_raw(&scsiconf->cdb_size, s->cdb_size);
 420     stw_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
 421     stw_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
 422     stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
 423 }
 424
 425 static void virtio_scsi_set_config(VirtIODevice *vdev,
 426                                    const uint8_t *config)
 427 {
 428     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 429     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 430
 431     if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 ||
 432         (uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) {
 433         error_report("bad data written to virtio-scsi configuration space");
 434         exit(1);
 435     }
 436
 437     vs->sense_size = ldl_raw(&scsiconf->sense_size);
 438     vs->cdb_size = ldl_raw(&scsiconf->cdb_size);
 439 }
 440
 441 static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
 442                                          uint32_t requested_features)
 443 {
 444     return requested_features;
 445 }
 446
 447 static void virtio_scsi_reset(VirtIODevice *vdev)
 448 {
 449     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 450     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 451
 452     s->resetting++;
 453     qbus_reset_all(&s->bus.qbus);
 454     s->resetting--;
 455
 456     vs->sense_size = VIRTIO_SCSI_SENSE_SIZE;
 457     vs->cdb_size = VIRTIO_SCSI_CDB_SIZE;
 458     s->events_dropped = false;
 459 }
 460
 461 /* The device does not have anything to save beyond the virtio data.
 462  * Request data is saved with callbacks from SCSI devices.
 463  */
 464 static void virtio_scsi_save(QEMUFile *f, void *opaque)
 465 {
 466     VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
 467     virtio_save(vdev, f);
 468 }
 469
 470 static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
 471 {
 472     VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
 473     int ret;
 474
 475     ret = virtio_load(vdev, f);
 476     if (ret) {
 477         return ret;
 478     }
 479     return 0;
 480 }
 481
 482 static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
 483                                    uint32_t event, uint32_t reason)
 484 {
 485     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
 486     VirtIOSCSIReq *req = virtio_scsi_pop_req(s, vs->event_vq);
 487     VirtIOSCSIEvent *evt;
 488     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 489     int in_size;
 490
 491     if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 492         return;
 493     }
 494
 495     if (!req) {
 496         s->events_dropped = true;
 497         return;
 498     }
 499
 500     if (req->elem.out_num || req->elem.in_num != 1) {
 501         virtio_scsi_bad_req();
 502     }
 503
 504     if (s->events_dropped) {
 505         event |= VIRTIO_SCSI_T_EVENTS_MISSED;
 506         s->events_dropped = false;
 507     }
 508
 509     in_size = req->elem.in_sg[0].iov_len;
 510     if (in_size < sizeof(VirtIOSCSIEvent)) {
 511         virtio_scsi_bad_req();
 512     }
 513
 514     evt = req->resp.event;
 515     memset(evt, 0, sizeof(VirtIOSCSIEvent));
 516     evt->event = event;
 517     evt->reason = reason;
 518     if (!dev) {
 519         assert(event == VIRTIO_SCSI_T_NO_EVENT);
 520     } else {
 521         evt->lun[0] = 1;
 522         evt->lun[1] = dev->id;
 523
 524         /* Linux wants us to keep the same encoding we use for REPORT LUNS.  */
 525         if (dev->lun >= 256) {
 526             evt->lun[2] = (dev->lun >> 8) | 0x40;
 527         }
 528         evt->lun[3] = dev->lun & 0xFF;
 529     }
 530     virtio_scsi_complete_req(req);
 531 }
 532
 533 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
 534 {
 535     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 536
 537     if (s->events_dropped) {
 538         virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
 539     }
 540 }
 541
 542 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
 543 {
 544     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 545     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 546
 547     if (((vdev->guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) &&
 548         dev->type != TYPE_ROM) {
 549         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
 550                                sense.asc | (sense.ascq << 8));
 551     }
 552 }
 553
 554 static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev)
 555 {
 556     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 557     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 558
 559     if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
 560         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
 561                                VIRTIO_SCSI_EVT_RESET_RESCAN);
 562     }
 563 }
 564
 565 static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev)
 566 {
 567     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 568     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 569
 570     if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
 571         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
 572                                VIRTIO_SCSI_EVT_RESET_REMOVED);
 573     }
 574 }
 575
 576 static struct SCSIBusInfo virtio_scsi_scsi_info = {
 577     .tcq = true,
 578     .max_channel = VIRTIO_SCSI_MAX_CHANNEL,
 579     .max_target = VIRTIO_SCSI_MAX_TARGET,
 580     .max_lun = VIRTIO_SCSI_MAX_LUN,
 581
 582     .complete = virtio_scsi_command_complete,
 583     .cancel = virtio_scsi_request_cancelled,
 584     .change = virtio_scsi_change,
 585     .hotplug = virtio_scsi_hotplug,
 586     .hot_unplug = virtio_scsi_hot_unplug,
 587     .get_sg_list = virtio_scsi_get_sg_list,
 588     .save_request = virtio_scsi_save_request,
 589     .load_request = virtio_scsi_load_request,
 590 };
 591
 592 void virtio_scsi_common_realize(DeviceState *dev, Error **errp)
 593 {
 594     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 595     VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev);
 596     int i;
 597
 598     virtio_init(vdev, "virtio-scsi", VIRTIO_ID_SCSI,
 599                 sizeof(VirtIOSCSIConfig));
 600
 601     s->cmd_vqs = g_malloc0(s->conf.num_queues * sizeof(VirtQueue *));
 602     s->sense_size = VIRTIO_SCSI_SENSE_SIZE;
 603     s->cdb_size = VIRTIO_SCSI_CDB_SIZE;
 604
 605     s->ctrl_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
 606                                   virtio_scsi_handle_ctrl);
 607     s->event_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
 608                                    virtio_scsi_handle_event);
 609     for (i = 0; i < s->conf.num_queues; i++) {
 610         s->cmd_vqs[i] = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
 611                                          virtio_scsi_handle_cmd);
 612     }
 613 }
 614
 615 static void virtio_scsi_device_realize(DeviceState *dev, Error **errp)
 616 {
 617     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 618     VirtIOSCSI *s = VIRTIO_SCSI(dev);
 619     static int virtio_scsi_id;
 620     Error *err = NULL;
 621
 622     virtio_scsi_common_realize(dev, &err);
 623     if (err != NULL) {
 624         error_propagate(errp, err);
 625         return;
 626     }
 627
 628     scsi_bus_new(&s->bus, sizeof(s->bus), dev,
 629                  &virtio_scsi_scsi_info, vdev->bus_name);
 630
 631     if (!dev->hotplugged) {
 632         scsi_bus_legacy_handle_cmdline(&s->bus, &err);
 633         if (err != NULL) {
 634             error_propagate(errp, err);
 635             return;
 636         }
 637     }
 638
 639     register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1,
 640                     virtio_scsi_save, virtio_scsi_load, s);
 641 }
 642
 643 void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp)
 644 {
 645     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 646     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
 647
 648     g_free(vs->cmd_vqs);
 649     virtio_cleanup(vdev);
 650 }
 651
 652 static void virtio_scsi_device_unrealize(DeviceState *dev, Error **errp)
 653 {
 654     VirtIOSCSI *s = VIRTIO_SCSI(dev);
 655
 656     unregister_savevm(dev, "virtio-scsi", s);
 657
 658     virtio_scsi_common_unrealize(dev, errp);
 659 }
 660
 661 static Property virtio_scsi_properties[] = {
 662     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSI, parent_obj.conf),
 663     DEFINE_PROP_END_OF_LIST(),
 664 };
 665
 666 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data)
 667 {
 668     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 669     DeviceClass *dc = DEVICE_CLASS(klass);
 670
 671     vdc->get_config = virtio_scsi_get_config;
 672     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 673 }
 674
 675 static void virtio_scsi_class_init(ObjectClass *klass, void *data)
 676 {
 677     DeviceClass *dc = DEVICE_CLASS(klass);
 678     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 679
 680     dc->props = virtio_scsi_properties;
 681     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 682     vdc->realize = virtio_scsi_device_realize;
 683     vdc->unrealize = virtio_scsi_device_unrealize;
 684     vdc->set_config = virtio_scsi_set_config;
 685     vdc->get_features = virtio_scsi_get_features;
 686     vdc->reset = virtio_scsi_reset;
 687 }
 688
 689 static const TypeInfo virtio_scsi_common_info = {
 690     .name = TYPE_VIRTIO_SCSI_COMMON,
 691     .parent = TYPE_VIRTIO_DEVICE,
 692     .instance_size = sizeof(VirtIOSCSICommon),
 693     .abstract = true,
 694     .class_init = virtio_scsi_common_class_init,
 695 };
 696
 697 static const TypeInfo virtio_scsi_info = {
 698     .name = TYPE_VIRTIO_SCSI,
 699     .parent = TYPE_VIRTIO_SCSI_COMMON,
 700     .instance_size = sizeof(VirtIOSCSI),
 701     .class_init = virtio_scsi_class_init,
 702 };
 703
 704 static void virtio_register_types(void)
 705 {
 706     type_register_static(&virtio_scsi_common_info);
 707     type_register_static(&virtio_scsi_info);
 708 }
 709
 710 type_init(virtio_register_types)