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 "qemu/osdep.h"
  17 #include "qapi/error.h"
  18 #include "standard-headers/linux/virtio_ids.h"
  19 #include "hw/virtio/virtio-scsi.h"
  20 #include "migration/qemu-file-types.h"
  21 #include "qemu/error-report.h"
  22 #include "qemu/iov.h"
  23 #include "qemu/module.h"
  24 #include "sysemu/block-backend.h"
  25 #include "hw/qdev-properties.h"
  26 #include "hw/scsi/scsi.h"
  27 #include "scsi/constants.h"
  28 #include "hw/virtio/virtio-bus.h"
  29 #include "hw/virtio/virtio-access.h"
  30 #include "trace.h"
  31
  32 typedef struct VirtIOSCSIReq {
  33     /*
  34      * Note:
  35      * - fields up to resp_iov are initialized by virtio_scsi_init_req;
  36      * - fields starting at vring are zeroed by virtio_scsi_init_req.
  37      */
  38     VirtQueueElement elem;
  39
  40     VirtIOSCSI *dev;
  41     VirtQueue *vq;
  42     QEMUSGList qsgl;
  43     QEMUIOVector resp_iov;
  44
  45     union {
  46         /* Used for two-stage request submission */
  47         QTAILQ_ENTRY(VirtIOSCSIReq) next;
  48
  49         /* Used for cancellation of request during TMFs */
  50         int remaining;
  51     };
  52
  53     SCSIRequest *sreq;
  54     size_t resp_size;
  55     enum SCSIXferMode mode;
  56     union {
  57         VirtIOSCSICmdResp     cmd;
  58         VirtIOSCSICtrlTMFResp tmf;
  59         VirtIOSCSICtrlANResp  an;
  60         VirtIOSCSIEvent       event;
  61     } resp;
  62     union {
  63         VirtIOSCSICmdReq      cmd;
  64         VirtIOSCSICtrlTMFReq  tmf;
  65         VirtIOSCSICtrlANReq   an;
  66     } req;
  67 } VirtIOSCSIReq;
  68
  69 static inline int virtio_scsi_get_lun(uint8_t *lun)
  70 {
  71     return ((lun[2] << 8) | lun[3]) & 0x3FFF;
  72 }
  73
  74 static inline SCSIDevice *virtio_scsi_device_get(VirtIOSCSI *s, uint8_t *lun)
  75 {
  76     if (lun[0] != 1) {
  77         return NULL;
  78     }
  79     if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) {
  80         return NULL;
  81     }
  82     return scsi_device_get(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
  83 }
  84
  85 static void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req)
  86 {
  87     VirtIODevice *vdev = VIRTIO_DEVICE(s);
  88     const size_t zero_skip =
  89         offsetof(VirtIOSCSIReq, resp_iov) + sizeof(req->resp_iov);
  90
  91     req->vq = vq;
  92     req->dev = s;
  93     qemu_sglist_init(&req->qsgl, DEVICE(s), 8, vdev->dma_as);
  94     qemu_iovec_init(&req->resp_iov, 1);
  95     memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip);
  96 }
  97
  98 static void virtio_scsi_free_req(VirtIOSCSIReq *req)
  99 {
 100     qemu_iovec_destroy(&req->resp_iov);
 101     qemu_sglist_destroy(&req->qsgl);
 102     g_free(req);
 103 }
 104
 105 static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
 106 {
 107     VirtIOSCSI *s = req->dev;
 108     VirtQueue *vq = req->vq;
 109     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 110
 111     qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size);
 112     virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size);
 113     if (s->dataplane_started && !s->dataplane_fenced) {
 114         virtio_notify_irqfd(vdev, vq);
 115     } else {
 116         virtio_notify(vdev, vq);
 117     }
 118
 119     if (req->sreq) {
 120         req->sreq->hba_private = NULL;
 121         scsi_req_unref(req->sreq);
 122     }
 123     virtio_scsi_free_req(req);
 124 }
 125
 126 static void virtio_scsi_bad_req(VirtIOSCSIReq *req)
 127 {
 128     virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers");
 129     virtqueue_detach_element(req->vq, &req->elem, 0);
 130     virtio_scsi_free_req(req);
 131 }
 132
 133 static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov,
 134                               hwaddr *addr, int num, size_t skip)
 135 {
 136     QEMUSGList *qsgl = &req->qsgl;
 137     size_t copied = 0;
 138
 139     while (num) {
 140         if (skip >= iov->iov_len) {
 141             skip -= iov->iov_len;
 142         } else {
 143             qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip);
 144             copied += iov->iov_len - skip;
 145             skip = 0;
 146         }
 147         iov++;
 148         addr++;
 149         num--;
 150     }
 151
 152     assert(skip == 0);
 153     return copied;
 154 }
 155
 156 static int virtio_scsi_parse_req(VirtIOSCSIReq *req,
 157                                  unsigned req_size, unsigned resp_size)
 158 {
 159     VirtIODevice *vdev = (VirtIODevice *) req->dev;
 160     size_t in_size, out_size;
 161
 162     if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
 163                    &req->req, req_size) < req_size) {
 164         return -EINVAL;
 165     }
 166
 167     if (qemu_iovec_concat_iov(&req->resp_iov,
 168                               req->elem.in_sg, req->elem.in_num, 0,
 169                               resp_size) < resp_size) {
 170         return -EINVAL;
 171     }
 172
 173     req->resp_size = resp_size;
 174
 175     /* Old BIOSes left some padding by mistake after the req_size/resp_size.
 176      * As a workaround, always consider the first buffer as the virtio-scsi
 177      * request/response, making the payload start at the second element
 178      * of the iovec.
 179      *
 180      * The actual length of the response header, stored in req->resp_size,
 181      * does not change.
 182      *
 183      * TODO: always disable this workaround for virtio 1.0 devices.
 184      */
 185     if (!virtio_vdev_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) {
 186         if (req->elem.out_num) {
 187             req_size = req->elem.out_sg[0].iov_len;
 188         }
 189         if (req->elem.in_num) {
 190             resp_size = req->elem.in_sg[0].iov_len;
 191         }
 192     }
 193
 194     out_size = qemu_sgl_concat(req, req->elem.out_sg,
 195                                &req->elem.out_addr[0], req->elem.out_num,
 196                                req_size);
 197     in_size = qemu_sgl_concat(req, req->elem.in_sg,
 198                               &req->elem.in_addr[0], req->elem.in_num,
 199                               resp_size);
 200
 201     if (out_size && in_size) {
 202         return -ENOTSUP;
 203     }
 204
 205     if (out_size) {
 206         req->mode = SCSI_XFER_TO_DEV;
 207     } else if (in_size) {
 208         req->mode = SCSI_XFER_FROM_DEV;
 209     }
 210
 211     return 0;
 212 }
 213
 214 static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
 215 {
 216     VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s;
 217     VirtIOSCSIReq *req;
 218
 219     req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + vs->cdb_size);
 220     if (!req) {
 221         return NULL;
 222     }
 223     virtio_scsi_init_req(s, vq, req);
 224     return req;
 225 }
 226
 227 static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq)
 228 {
 229     VirtIOSCSIReq *req = sreq->hba_private;
 230     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev);
 231     VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
 232     uint32_t n = virtio_get_queue_index(req->vq) - VIRTIO_SCSI_VQ_NUM_FIXED;
 233
 234     assert(n < vs->conf.num_queues);
 235     qemu_put_be32s(f, &n);
 236     qemu_put_virtqueue_element(vdev, f, &req->elem);
 237 }
 238
 239 static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
 240 {
 241     SCSIBus *bus = sreq->bus;
 242     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 243     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
 244     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 245     VirtIOSCSIReq *req;
 246     uint32_t n;
 247
 248     qemu_get_be32s(f, &n);
 249     assert(n < vs->conf.num_queues);
 250     req = qemu_get_virtqueue_element(vdev, f,
 251                                      sizeof(VirtIOSCSIReq) + vs->cdb_size);
 252     virtio_scsi_init_req(s, vs->cmd_vqs[n], req);
 253
 254     if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
 255                               sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) {
 256         error_report("invalid SCSI request migration data");
 257         exit(1);
 258     }
 259
 260     scsi_req_ref(sreq);
 261     req->sreq = sreq;
 262     if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
 263         assert(req->sreq->cmd.mode == req->mode);
 264     }
 265     return req;
 266 }
 267
 268 typedef struct {
 269     Notifier        notifier;
 270     VirtIOSCSIReq  *tmf_req;
 271 } VirtIOSCSICancelNotifier;
 272
 273 static void virtio_scsi_cancel_notify(Notifier *notifier, void *data)
 274 {
 275     VirtIOSCSICancelNotifier *n = container_of(notifier,
 276                                                VirtIOSCSICancelNotifier,
 277                                                notifier);
 278
 279     if (--n->tmf_req->remaining == 0) {
 280         VirtIOSCSIReq *req = n->tmf_req;
 281
 282         trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun),
 283                                    req->req.tmf.tag, req->resp.tmf.response);
 284         virtio_scsi_complete_req(req);
 285     }
 286     g_free(n);
 287 }
 288
 289 static inline void virtio_scsi_ctx_check(VirtIOSCSI *s, SCSIDevice *d)
 290 {
 291     if (s->dataplane_started && d && blk_is_available(d->conf.blk)) {
 292         assert(blk_get_aio_context(d->conf.blk) == s->ctx);
 293     }
 294 }
 295
 296 /* Return 0 if the request is ready to be completed and return to guest;
 297  * -EINPROGRESS if the request is submitted and will be completed later, in the
 298  *  case of async cancellation. */
 299 static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
 300 {
 301     SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun);
 302     SCSIRequest *r, *next;
 303     BusChild *kid;
 304     int target;
 305     int ret = 0;
 306
 307     virtio_scsi_ctx_check(s, d);
 308     /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE".  */
 309     req->resp.tmf.response = VIRTIO_SCSI_S_OK;
 310
 311     /*
 312      * req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s()
 313      * to avoid compiler errors.
 314      */
 315     req->req.tmf.subtype =
 316         virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype);
 317
 318     trace_virtio_scsi_tmf_req(virtio_scsi_get_lun(req->req.tmf.lun),
 319                               req->req.tmf.tag, req->req.tmf.subtype);
 320
 321     switch (req->req.tmf.subtype) {
 322     case VIRTIO_SCSI_T_TMF_ABORT_TASK:
 323     case VIRTIO_SCSI_T_TMF_QUERY_TASK:
 324         if (!d) {
 325             goto fail;
 326         }
 327         if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
 328             goto incorrect_lun;
 329         }
 330         QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
 331             VirtIOSCSIReq *cmd_req = r->hba_private;
 332             if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) {
 333                 break;
 334             }
 335         }
 336         if (r) {
 337             /*
 338              * Assert that the request has not been completed yet, we
 339              * check for it in the loop above.
 340              */
 341             assert(r->hba_private);
 342             if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
 343                 /* "If the specified command is present in the task set, then
 344                  * return a service response set to FUNCTION SUCCEEDED".
 345                  */
 346                 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
 347             } else {
 348                 VirtIOSCSICancelNotifier *notifier;
 349
 350                 req->remaining = 1;
 351                 notifier = g_new(VirtIOSCSICancelNotifier, 1);
 352                 notifier->tmf_req = req;
 353                 notifier->notifier.notify = virtio_scsi_cancel_notify;
 354                 scsi_req_cancel_async(r, &notifier->notifier);
 355                 ret = -EINPROGRESS;
 356             }
 357         }
 358         break;
 359
 360     case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
 361         if (!d) {
 362             goto fail;
 363         }
 364         if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
 365             goto incorrect_lun;
 366         }
 367         s->resetting++;
 368         qdev_reset_all(&d->qdev);
 369         s->resetting--;
 370         break;
 371
 372     case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
 373     case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
 374     case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
 375         if (!d) {
 376             goto fail;
 377         }
 378         if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
 379             goto incorrect_lun;
 380         }
 381
 382         /* Add 1 to "remaining" until virtio_scsi_do_tmf returns.
 383          * This way, if the bus starts calling back to the notifiers
 384          * even before we finish the loop, virtio_scsi_cancel_notify
 385          * will not complete the TMF too early.
 386          */
 387         req->remaining = 1;
 388         QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
 389             if (r->hba_private) {
 390                 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) {
 391                     /* "If there is any command present in the task set, then
 392                      * return a service response set to FUNCTION SUCCEEDED".
 393                      */
 394                     req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
 395                     break;
 396                 } else {
 397                     VirtIOSCSICancelNotifier *notifier;
 398
 399                     req->remaining++;
 400                     notifier = g_new(VirtIOSCSICancelNotifier, 1);
 401                     notifier->notifier.notify = virtio_scsi_cancel_notify;
 402                     notifier->tmf_req = req;
 403                     scsi_req_cancel_async(r, &notifier->notifier);
 404                 }
 405             }
 406         }
 407         if (--req->remaining > 0) {
 408             ret = -EINPROGRESS;
 409         }
 410         break;
 411
 412     case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
 413         target = req->req.tmf.lun[1];
 414         s->resetting++;
 415
 416         rcu_read_lock();
 417         QTAILQ_FOREACH_RCU(kid, &s->bus.qbus.children, sibling) {
 418             SCSIDevice *d1 = SCSI_DEVICE(kid->child);
 419             if (d1->channel == 0 && d1->id == target) {
 420                 qdev_reset_all(&d1->qdev);
 421             }
 422         }
 423         rcu_read_unlock();
 424
 425         s->resetting--;
 426         break;
 427
 428     case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
 429     default:
 430         req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
 431         break;
 432     }
 433
 434     object_unref(OBJECT(d));
 435     return ret;
 436
 437 incorrect_lun:
 438     req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN;
 439     object_unref(OBJECT(d));
 440     return ret;
 441
 442 fail:
 443     req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET;
 444     object_unref(OBJECT(d));
 445     return ret;
 446 }
 447
 448 static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req)
 449 {
 450     VirtIODevice *vdev = (VirtIODevice *)s;
 451     uint32_t type;
 452     int r = 0;
 453
 454     if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
 455                 &type, sizeof(type)) < sizeof(type)) {
 456         virtio_scsi_bad_req(req);
 457         return;
 458     }
 459
 460     virtio_tswap32s(vdev, &type);
 461     if (type == VIRTIO_SCSI_T_TMF) {
 462         if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq),
 463                     sizeof(VirtIOSCSICtrlTMFResp)) < 0) {
 464             virtio_scsi_bad_req(req);
 465             return;
 466         } else {
 467             r = virtio_scsi_do_tmf(s, req);
 468         }
 469
 470     } else if (type == VIRTIO_SCSI_T_AN_QUERY ||
 471                type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
 472         if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq),
 473                     sizeof(VirtIOSCSICtrlANResp)) < 0) {
 474             virtio_scsi_bad_req(req);
 475             return;
 476         } else {
 477             req->req.an.event_requested =
 478                 virtio_tswap32(VIRTIO_DEVICE(s), req->req.an.event_requested);
 479             trace_virtio_scsi_an_req(virtio_scsi_get_lun(req->req.an.lun),
 480                                      req->req.an.event_requested);
 481             req->resp.an.event_actual = 0;
 482             req->resp.an.response = VIRTIO_SCSI_S_OK;
 483         }
 484     }
 485     if (r == 0) {
 486         if (type == VIRTIO_SCSI_T_TMF)
 487             trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun),
 488                                        req->req.tmf.tag,
 489                                        req->resp.tmf.response);
 490         else if (type == VIRTIO_SCSI_T_AN_QUERY ||
 491                  type == VIRTIO_SCSI_T_AN_SUBSCRIBE)
 492             trace_virtio_scsi_an_resp(virtio_scsi_get_lun(req->req.an.lun),
 493                                       req->resp.an.response);
 494         virtio_scsi_complete_req(req);
 495     } else {
 496         assert(r == -EINPROGRESS);
 497     }
 498 }
 499
 500 static void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq)
 501 {
 502     VirtIOSCSIReq *req;
 503
 504     while ((req = virtio_scsi_pop_req(s, vq))) {
 505         virtio_scsi_handle_ctrl_req(s, req);
 506     }
 507 }
 508
 509 /*
 510  * If dataplane is configured but not yet started, do so now and return true on
 511  * success.
 512  *
 513  * Dataplane is started by the core virtio code but virtqueue handler functions
 514  * can also be invoked when a guest kicks before DRIVER_OK, so this helper
 515  * function helps us deal with manually starting ioeventfd in that case.
 516  */
 517 static bool virtio_scsi_defer_to_dataplane(VirtIOSCSI *s)
 518 {
 519     if (!s->ctx || s->dataplane_started) {
 520         return false;
 521     }
 522
 523     virtio_device_start_ioeventfd(&s->parent_obj.parent_obj);
 524     return !s->dataplane_fenced;
 525 }
 526
 527 static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
 528 {
 529     VirtIOSCSI *s = (VirtIOSCSI *)vdev;
 530
 531     if (virtio_scsi_defer_to_dataplane(s)) {
 532         return;
 533     }
 534
 535     virtio_scsi_acquire(s);
 536     virtio_scsi_handle_ctrl_vq(s, vq);
 537     virtio_scsi_release(s);
 538 }
 539
 540 static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req)
 541 {
 542     trace_virtio_scsi_cmd_resp(virtio_scsi_get_lun(req->req.cmd.lun),
 543                                req->req.cmd.tag,
 544                                req->resp.cmd.response,
 545                                req->resp.cmd.status);
 546     /* Sense data is not in req->resp and is copied separately
 547      * in virtio_scsi_command_complete.
 548      */
 549     req->resp_size = sizeof(VirtIOSCSICmdResp);
 550     virtio_scsi_complete_req(req);
 551 }
 552
 553 static void virtio_scsi_command_failed(SCSIRequest *r)
 554 {
 555     VirtIOSCSIReq *req = r->hba_private;
 556
 557     if (r->io_canceled) {
 558         return;
 559     }
 560
 561     req->resp.cmd.status = GOOD;
 562     switch (r->host_status) {
 563     case SCSI_HOST_NO_LUN:
 564         req->resp.cmd.response = VIRTIO_SCSI_S_INCORRECT_LUN;
 565         break;
 566     case SCSI_HOST_BUSY:
 567         req->resp.cmd.response = VIRTIO_SCSI_S_BUSY;
 568         break;
 569     case SCSI_HOST_TIME_OUT:
 570     case SCSI_HOST_ABORTED:
 571         req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED;
 572         break;
 573     case SCSI_HOST_BAD_RESPONSE:
 574         req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
 575         break;
 576     case SCSI_HOST_RESET:
 577         req->resp.cmd.response = VIRTIO_SCSI_S_RESET;
 578         break;
 579     case SCSI_HOST_TRANSPORT_DISRUPTED:
 580         req->resp.cmd.response = VIRTIO_SCSI_S_TRANSPORT_FAILURE;
 581         break;
 582     case SCSI_HOST_TARGET_FAILURE:
 583         req->resp.cmd.response = VIRTIO_SCSI_S_TARGET_FAILURE;
 584         break;
 585     case SCSI_HOST_RESERVATION_ERROR:
 586         req->resp.cmd.response = VIRTIO_SCSI_S_NEXUS_FAILURE;
 587         break;
 588     case SCSI_HOST_ALLOCATION_FAILURE:
 589     case SCSI_HOST_MEDIUM_ERROR:
 590     case SCSI_HOST_ERROR:
 591     default:
 592         req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE;
 593         break;
 594     }
 595     virtio_scsi_complete_cmd_req(req);
 596 }
 597
 598 static void virtio_scsi_command_complete(SCSIRequest *r, size_t resid)
 599 {
 600     VirtIOSCSIReq *req = r->hba_private;
 601     uint8_t sense[SCSI_SENSE_BUF_SIZE];
 602     uint32_t sense_len;
 603     VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
 604
 605     if (r->io_canceled) {
 606         return;
 607     }
 608
 609     req->resp.cmd.response = VIRTIO_SCSI_S_OK;
 610     req->resp.cmd.status = r->status;
 611     if (req->resp.cmd.status == GOOD) {
 612         req->resp.cmd.resid = virtio_tswap32(vdev, resid);
 613     } else {
 614         req->resp.cmd.resid = 0;
 615         sense_len = scsi_req_get_sense(r, sense, sizeof(sense));
 616         sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd));
 617         qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd),
 618                             sense, sense_len);
 619         req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len);
 620     }
 621     virtio_scsi_complete_cmd_req(req);
 622 }
 623
 624 static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd,
 625                                  uint8_t *buf, size_t buf_len,
 626                                  void *hba_private)
 627 {
 628     VirtIOSCSIReq *req = hba_private;
 629
 630     if (cmd->len == 0) {
 631         cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE);
 632         memcpy(cmd->buf, buf, cmd->len);
 633     }
 634
 635     /* Extract the direction and mode directly from the request, for
 636      * host device passthrough.
 637      */
 638     cmd->xfer = req->qsgl.size;
 639     cmd->mode = req->mode;
 640     return 0;
 641 }
 642
 643 static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
 644 {
 645     VirtIOSCSIReq *req = r->hba_private;
 646
 647     return &req->qsgl;
 648 }
 649
 650 static void virtio_scsi_request_cancelled(SCSIRequest *r)
 651 {
 652     VirtIOSCSIReq *req = r->hba_private;
 653
 654     if (!req) {
 655         return;
 656     }
 657     if (req->dev->resetting) {
 658         req->resp.cmd.response = VIRTIO_SCSI_S_RESET;
 659     } else {
 660         req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED;
 661     }
 662     virtio_scsi_complete_cmd_req(req);
 663 }
 664
 665 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
 666 {
 667     req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE;
 668     virtio_scsi_complete_cmd_req(req);
 669 }
 670
 671 static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req)
 672 {
 673     VirtIOSCSICommon *vs = &s->parent_obj;
 674     SCSIDevice *d;
 675     int rc;
 676
 677     rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
 678                                sizeof(VirtIOSCSICmdResp) + vs->sense_size);
 679     if (rc < 0) {
 680         if (rc == -ENOTSUP) {
 681             virtio_scsi_fail_cmd_req(req);
 682             return -ENOTSUP;
 683         } else {
 684             virtio_scsi_bad_req(req);
 685             return -EINVAL;
 686         }
 687     }
 688     trace_virtio_scsi_cmd_req(virtio_scsi_get_lun(req->req.cmd.lun),
 689                               req->req.cmd.tag, req->req.cmd.cdb[0]);
 690
 691     d = virtio_scsi_device_get(s, req->req.cmd.lun);
 692     if (!d) {
 693         req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
 694         virtio_scsi_complete_cmd_req(req);
 695         return -ENOENT;
 696     }
 697     virtio_scsi_ctx_check(s, d);
 698     req->sreq = scsi_req_new(d, req->req.cmd.tag,
 699                              virtio_scsi_get_lun(req->req.cmd.lun),
 700                              req->req.cmd.cdb, vs->cdb_size, req);
 701
 702     if (req->sreq->cmd.mode != SCSI_XFER_NONE
 703         && (req->sreq->cmd.mode != req->mode ||
 704             req->sreq->cmd.xfer > req->qsgl.size)) {
 705         req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN;
 706         virtio_scsi_complete_cmd_req(req);
 707         object_unref(OBJECT(d));
 708         return -ENOBUFS;
 709     }
 710     scsi_req_ref(req->sreq);
 711     blk_io_plug(d->conf.blk);
 712     object_unref(OBJECT(d));
 713     return 0;
 714 }
 715
 716 static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req)
 717 {
 718     SCSIRequest *sreq = req->sreq;
 719     if (scsi_req_enqueue(sreq)) {
 720         scsi_req_continue(sreq);
 721     }
 722     blk_io_unplug(sreq->dev->conf.blk);
 723     scsi_req_unref(sreq);
 724 }
 725
 726 static void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq)
 727 {
 728     VirtIOSCSIReq *req, *next;
 729     int ret = 0;
 730     bool suppress_notifications = virtio_queue_get_notification(vq);
 731
 732     QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs);
 733
 734     do {
 735         if (suppress_notifications) {
 736             virtio_queue_set_notification(vq, 0);
 737         }
 738
 739         while ((req = virtio_scsi_pop_req(s, vq))) {
 740             ret = virtio_scsi_handle_cmd_req_prepare(s, req);
 741             if (!ret) {
 742                 QTAILQ_INSERT_TAIL(&reqs, req, next);
 743             } else if (ret == -EINVAL) {
 744                 /* The device is broken and shouldn't process any request */
 745                 while (!QTAILQ_EMPTY(&reqs)) {
 746                     req = QTAILQ_FIRST(&reqs);
 747                     QTAILQ_REMOVE(&reqs, req, next);
 748                     blk_io_unplug(req->sreq->dev->conf.blk);
 749                     scsi_req_unref(req->sreq);
 750                     virtqueue_detach_element(req->vq, &req->elem, 0);
 751                     virtio_scsi_free_req(req);
 752                 }
 753             }
 754         }
 755
 756         if (suppress_notifications) {
 757             virtio_queue_set_notification(vq, 1);
 758         }
 759     } while (ret != -EINVAL && !virtio_queue_empty(vq));
 760
 761     QTAILQ_FOREACH_SAFE(req, &reqs, next, next) {
 762         virtio_scsi_handle_cmd_req_submit(s, req);
 763     }
 764 }
 765
 766 static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
 767 {
 768     /* use non-QOM casts in the data path */
 769     VirtIOSCSI *s = (VirtIOSCSI *)vdev;
 770
 771     if (virtio_scsi_defer_to_dataplane(s)) {
 772         return;
 773     }
 774
 775     virtio_scsi_acquire(s);
 776     virtio_scsi_handle_cmd_vq(s, vq);
 777     virtio_scsi_release(s);
 778 }
 779
 780 static void virtio_scsi_get_config(VirtIODevice *vdev,
 781                                    uint8_t *config)
 782 {
 783     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 784     VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev);
 785
 786     virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues);
 787     virtio_stl_p(vdev, &scsiconf->seg_max,
 788                  s->conf.seg_max_adjust ? s->conf.virtqueue_size - 2 : 128 - 2);
 789     virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors);
 790     virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun);
 791     virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
 792     virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size);
 793     virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size);
 794     virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
 795     virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
 796     virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
 797 }
 798
 799 static void virtio_scsi_set_config(VirtIODevice *vdev,
 800                                    const uint8_t *config)
 801 {
 802     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 803     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 804
 805     if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 ||
 806         (uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) {
 807         virtio_error(vdev,
 808                      "bad data written to virtio-scsi configuration space");
 809         return;
 810     }
 811
 812     vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size);
 813     vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size);
 814 }
 815
 816 static uint64_t virtio_scsi_get_features(VirtIODevice *vdev,
 817                                          uint64_t requested_features,
 818                                          Error **errp)
 819 {
 820     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 821
 822     /* Firstly sync all virtio-scsi possible supported features */
 823     requested_features |= s->host_features;
 824     return requested_features;
 825 }
 826
 827 static void virtio_scsi_reset(VirtIODevice *vdev)
 828 {
 829     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 830     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 831
 832     assert(!s->dataplane_started);
 833     s->resetting++;
 834     qbus_reset_all(BUS(&s->bus));
 835     s->resetting--;
 836
 837     vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE;
 838     vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE;
 839     s->events_dropped = false;
 840 }
 841
 842 static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
 843                                    uint32_t event, uint32_t reason)
 844 {
 845     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
 846     VirtIOSCSIReq *req;
 847     VirtIOSCSIEvent *evt;
 848     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 849
 850     if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 851         return;
 852     }
 853
 854     req = virtio_scsi_pop_req(s, vs->event_vq);
 855     if (!req) {
 856         s->events_dropped = true;
 857         return;
 858     }
 859
 860     if (s->events_dropped) {
 861         event |= VIRTIO_SCSI_T_EVENTS_MISSED;
 862         s->events_dropped = false;
 863     }
 864
 865     if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) {
 866         virtio_scsi_bad_req(req);
 867         return;
 868     }
 869
 870     evt = &req->resp.event;
 871     memset(evt, 0, sizeof(VirtIOSCSIEvent));
 872     evt->event = virtio_tswap32(vdev, event);
 873     evt->reason = virtio_tswap32(vdev, reason);
 874     if (!dev) {
 875         assert(event == VIRTIO_SCSI_T_EVENTS_MISSED);
 876     } else {
 877         evt->lun[0] = 1;
 878         evt->lun[1] = dev->id;
 879
 880         /* Linux wants us to keep the same encoding we use for REPORT LUNS.  */
 881         if (dev->lun >= 256) {
 882             evt->lun[2] = (dev->lun >> 8) | 0x40;
 883         }
 884         evt->lun[3] = dev->lun & 0xFF;
 885     }
 886     trace_virtio_scsi_event(virtio_scsi_get_lun(evt->lun), event, reason);
 887
 888     virtio_scsi_complete_req(req);
 889 }
 890
 891 static void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq)
 892 {
 893     if (s->events_dropped) {
 894         virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
 895     }
 896 }
 897
 898 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
 899 {
 900     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 901
 902     if (virtio_scsi_defer_to_dataplane(s)) {
 903         return;
 904     }
 905
 906     virtio_scsi_acquire(s);
 907     virtio_scsi_handle_event_vq(s, vq);
 908     virtio_scsi_release(s);
 909 }
 910
 911 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
 912 {
 913     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 914     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 915
 916     if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) &&
 917         dev->type != TYPE_ROM) {
 918         virtio_scsi_acquire(s);
 919         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
 920                                sense.asc | (sense.ascq << 8));
 921         virtio_scsi_release(s);
 922     }
 923 }
 924
 925 static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev,
 926                                     DeviceState *dev, Error **errp)
 927 {
 928     SCSIDevice *sd = SCSI_DEVICE(dev);
 929     sd->hba_supports_iothread = true;
 930 }
 931
 932 static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
 933                                 Error **errp)
 934 {
 935     VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
 936     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 937     SCSIDevice *sd = SCSI_DEVICE(dev);
 938     AioContext *old_context;
 939     int ret;
 940
 941     if (s->ctx && !s->dataplane_fenced) {
 942         if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
 943             return;
 944         }
 945         old_context = blk_get_aio_context(sd->conf.blk);
 946         aio_context_acquire(old_context);
 947         ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp);
 948         aio_context_release(old_context);
 949         if (ret < 0) {
 950             return;
 951         }
 952     }
 953
 954     if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
 955         virtio_scsi_acquire(s);
 956         virtio_scsi_push_event(s, sd,
 957                                VIRTIO_SCSI_T_TRANSPORT_RESET,
 958                                VIRTIO_SCSI_EVT_RESET_RESCAN);
 959         virtio_scsi_release(s);
 960     }
 961 }
 962
 963 static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev,
 964                                   Error **errp)
 965 {
 966     VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
 967     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 968     SCSIDevice *sd = SCSI_DEVICE(dev);
 969     AioContext *ctx = s->ctx ?: qemu_get_aio_context();
 970
 971     if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
 972         virtio_scsi_acquire(s);
 973         virtio_scsi_push_event(s, sd,
 974                                VIRTIO_SCSI_T_TRANSPORT_RESET,
 975                                VIRTIO_SCSI_EVT_RESET_REMOVED);
 976         virtio_scsi_release(s);
 977     }
 978
 979     aio_disable_external(ctx);
 980     qdev_simple_device_unplug_cb(hotplug_dev, dev, errp);
 981     aio_enable_external(ctx);
 982
 983     if (s->ctx) {
 984         virtio_scsi_acquire(s);
 985         /* If other users keep the BlockBackend in the iothread, that's ok */
 986         blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL);
 987         virtio_scsi_release(s);
 988     }
 989 }
 990
 991 static struct SCSIBusInfo virtio_scsi_scsi_info = {
 992     .tcq = true,
 993     .max_channel = VIRTIO_SCSI_MAX_CHANNEL,
 994     .max_target = VIRTIO_SCSI_MAX_TARGET,
 995     .max_lun = VIRTIO_SCSI_MAX_LUN,
 996
 997     .complete = virtio_scsi_command_complete,
 998     .fail = virtio_scsi_command_failed,
 999     .cancel = virtio_scsi_request_cancelled,
1000     .change = virtio_scsi_change,
1001     .parse_cdb = virtio_scsi_parse_cdb,
1002     .get_sg_list = virtio_scsi_get_sg_list,
1003     .save_request = virtio_scsi_save_request,
1004     .load_request = virtio_scsi_load_request,
1005 };
1006
1007 void virtio_scsi_common_realize(DeviceState *dev,
1008                                 VirtIOHandleOutput ctrl,
1009                                 VirtIOHandleOutput evt,
1010                                 VirtIOHandleOutput cmd,
1011                                 Error **errp)
1012 {
1013     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1014     VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev);
1015     int i;
1016
1017     virtio_init(vdev, VIRTIO_ID_SCSI, sizeof(VirtIOSCSIConfig));
1018
1019     if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
1020         s->conf.num_queues = 1;
1021     }
1022     if (s->conf.num_queues == 0 ||
1023             s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) {
1024         error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
1025                          "must be a positive integer less than %d.",
1026                    s->conf.num_queues,
1027                    VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED);
1028         virtio_cleanup(vdev);
1029         return;
1030     }
1031     if (s->conf.virtqueue_size <= 2) {
1032         error_setg(errp, "invalid virtqueue_size property (= %" PRIu32 "), "
1033                    "must be > 2", s->conf.virtqueue_size);
1034         return;
1035     }
1036     s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues);
1037     s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE;
1038     s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE;
1039
1040     s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl);
1041     s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt);
1042     for (i = 0; i < s->conf.num_queues; i++) {
1043         s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd);
1044     }
1045 }
1046
1047 static void virtio_scsi_device_realize(DeviceState *dev, Error **errp)
1048 {
1049     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1050     VirtIOSCSI *s = VIRTIO_SCSI(dev);
1051     Error *err = NULL;
1052
1053     virtio_scsi_common_realize(dev,
1054                                virtio_scsi_handle_ctrl,
1055                                virtio_scsi_handle_event,
1056                                virtio_scsi_handle_cmd,
1057                                &err);
1058     if (err != NULL) {
1059         error_propagate(errp, err);
1060         return;
1061     }
1062
1063     scsi_bus_init_named(&s->bus, sizeof(s->bus), dev,
1064                        &virtio_scsi_scsi_info, vdev->bus_name);
1065     /* override default SCSI bus hotplug-handler, with virtio-scsi's one */
1066     qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev));
1067
1068     virtio_scsi_dataplane_setup(s, errp);
1069 }
1070
1071 void virtio_scsi_common_unrealize(DeviceState *dev)
1072 {
1073     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1074     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
1075     int i;
1076
1077     virtio_delete_queue(vs->ctrl_vq);
1078     virtio_delete_queue(vs->event_vq);
1079     for (i = 0; i < vs->conf.num_queues; i++) {
1080         virtio_delete_queue(vs->cmd_vqs[i]);
1081     }
1082     g_free(vs->cmd_vqs);
1083     virtio_cleanup(vdev);
1084 }
1085
1086 static void virtio_scsi_device_unrealize(DeviceState *dev)
1087 {
1088     VirtIOSCSI *s = VIRTIO_SCSI(dev);
1089
1090     qbus_set_hotplug_handler(BUS(&s->bus), NULL);
1091     virtio_scsi_common_unrealize(dev);
1092 }
1093
1094 static Property virtio_scsi_properties[] = {
1095     DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues,
1096                        VIRTIO_SCSI_AUTO_NUM_QUEUES),
1097     DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI,
1098                                          parent_obj.conf.virtqueue_size, 256),
1099     DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI,
1100                       parent_obj.conf.seg_max_adjust, true),
1101     DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors,
1102                                                   0xFFFF),
1103     DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun,
1104                                                   128),
1105     DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features,
1106                                            VIRTIO_SCSI_F_HOTPLUG, true),
1107     DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features,
1108                                                 VIRTIO_SCSI_F_CHANGE, true),
1109     DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread,
1110                      TYPE_IOTHREAD, IOThread *),
1111     DEFINE_PROP_END_OF_LIST(),
1112 };
1113
1114 static const VMStateDescription vmstate_virtio_scsi = {
1115     .name = "virtio-scsi",
1116     .minimum_version_id = 1,
1117     .version_id = 1,
1118     .fields = (VMStateField[]) {
1119         VMSTATE_VIRTIO_DEVICE,
1120         VMSTATE_END_OF_LIST()
1121     },
1122 };
1123
1124 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data)
1125 {
1126     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1127     DeviceClass *dc = DEVICE_CLASS(klass);
1128
1129     vdc->get_config = virtio_scsi_get_config;
1130     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1131 }
1132
1133 static void virtio_scsi_class_init(ObjectClass *klass, void *data)
1134 {
1135     DeviceClass *dc = DEVICE_CLASS(klass);
1136     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1137     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
1138
1139     device_class_set_props(dc, virtio_scsi_properties);
1140     dc->vmsd = &vmstate_virtio_scsi;
1141     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1142     vdc->realize = virtio_scsi_device_realize;
1143     vdc->unrealize = virtio_scsi_device_unrealize;
1144     vdc->set_config = virtio_scsi_set_config;
1145     vdc->get_features = virtio_scsi_get_features;
1146     vdc->reset = virtio_scsi_reset;
1147     vdc->start_ioeventfd = virtio_scsi_dataplane_start;
1148     vdc->stop_ioeventfd = virtio_scsi_dataplane_stop;
1149     hc->pre_plug = virtio_scsi_pre_hotplug;
1150     hc->plug = virtio_scsi_hotplug;
1151     hc->unplug = virtio_scsi_hotunplug;
1152 }
1153
1154 static const TypeInfo virtio_scsi_common_info = {
1155     .name = TYPE_VIRTIO_SCSI_COMMON,
1156     .parent = TYPE_VIRTIO_DEVICE,
1157     .instance_size = sizeof(VirtIOSCSICommon),
1158     .abstract = true,
1159     .class_init = virtio_scsi_common_class_init,
1160 };
1161
1162 static const TypeInfo virtio_scsi_info = {
1163     .name = TYPE_VIRTIO_SCSI,
1164     .parent = TYPE_VIRTIO_SCSI_COMMON,
1165     .instance_size = sizeof(VirtIOSCSI),
1166     .class_init = virtio_scsi_class_init,
1167     .interfaces = (InterfaceInfo[]) {
1168         { TYPE_HOTPLUG_HANDLER },
1169         { }
1170     }
1171 };
1172
1173 static void virtio_register_types(void)
1174 {
1175     type_register_static(&virtio_scsi_common_info);
1176     type_register_static(&virtio_scsi_info);
1177 }
1178
1179 type_init(virtio_register_types)