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 "sysemu/dma.h"
  26 #include "hw/qdev-properties.h"
  27 #include "hw/scsi/scsi.h"
  28 #include "scsi/constants.h"
  29 #include "hw/virtio/virtio-bus.h"
  30 #include "hw/virtio/virtio-access.h"
  31 #include "trace.h"
  32
  33 typedef struct VirtIOSCSIReq {
  34     /*
  35      * Note:
  36      * - fields up to resp_iov are initialized by virtio_scsi_init_req;
  37      * - fields starting at vring are zeroed by virtio_scsi_init_req.
  38      */
  39     VirtQueueElement elem;
  40
  41     VirtIOSCSI *dev;
  42     VirtQueue *vq;
  43     QEMUSGList qsgl;
  44     QEMUIOVector resp_iov;
  45
  46     union {
  47         /* Used for two-stage request submission */
  48         QTAILQ_ENTRY(VirtIOSCSIReq) next;
  49
  50         /* Used for cancellation of request during TMFs */
  51         int remaining;
  52     };
  53
  54     SCSIRequest *sreq;
  55     size_t resp_size;
  56     enum SCSIXferMode mode;
  57     union {
  58         VirtIOSCSICmdResp     cmd;
  59         VirtIOSCSICtrlTMFResp tmf;
  60         VirtIOSCSICtrlANResp  an;
  61         VirtIOSCSIEvent       event;
  62     } resp;
  63     union {
  64         VirtIOSCSICmdReq      cmd;
  65         VirtIOSCSICtrlTMFReq  tmf;
  66         VirtIOSCSICtrlANReq   an;
  67     } req;
  68 } VirtIOSCSIReq;
  69
  70 static inline int virtio_scsi_get_lun(uint8_t *lun)
  71 {
  72     return ((lun[2] << 8) | lun[3]) & 0x3FFF;
  73 }
  74
  75 static inline SCSIDevice *virtio_scsi_device_get(VirtIOSCSI *s, uint8_t *lun)
  76 {
  77     if (lun[0] != 1) {
  78         return NULL;
  79     }
  80     if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) {
  81         return NULL;
  82     }
  83     return scsi_device_get(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
  84 }
  85
  86 static void virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq, VirtIOSCSIReq *req)
  87 {
  88     VirtIODevice *vdev = VIRTIO_DEVICE(s);
  89     const size_t zero_skip =
  90         offsetof(VirtIOSCSIReq, resp_iov) + sizeof(req->resp_iov);
  91
  92     req->vq = vq;
  93     req->dev = s;
  94     qemu_sglist_init(&req->qsgl, DEVICE(s), 8, vdev->dma_as);
  95     qemu_iovec_init(&req->resp_iov, 1);
  96     memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip);
  97 }
  98
  99 static void virtio_scsi_free_req(VirtIOSCSIReq *req)
 100 {
 101     qemu_iovec_destroy(&req->resp_iov);
 102     qemu_sglist_destroy(&req->qsgl);
 103     g_free(req);
 104 }
 105
 106 static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
 107 {
 108     VirtIOSCSI *s = req->dev;
 109     VirtQueue *vq = req->vq;
 110     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 111
 112     qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size);
 113     virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size);
 114     if (s->dataplane_started && !s->dataplane_fenced) {
 115         virtio_notify_irqfd(vdev, vq);
 116     } else {
 117         virtio_notify(vdev, vq);
 118     }
 119
 120     if (req->sreq) {
 121         req->sreq->hba_private = NULL;
 122         scsi_req_unref(req->sreq);
 123     }
 124     virtio_scsi_free_req(req);
 125 }
 126
 127 static void virtio_scsi_bad_req(VirtIOSCSIReq *req)
 128 {
 129     virtio_error(VIRTIO_DEVICE(req->dev), "wrong size for virtio-scsi headers");
 130     virtqueue_detach_element(req->vq, &req->elem, 0);
 131     virtio_scsi_free_req(req);
 132 }
 133
 134 static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov,
 135                               hwaddr *addr, int num, size_t skip)
 136 {
 137     QEMUSGList *qsgl = &req->qsgl;
 138     size_t copied = 0;
 139
 140     while (num) {
 141         if (skip >= iov->iov_len) {
 142             skip -= iov->iov_len;
 143         } else {
 144             qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip);
 145             copied += iov->iov_len - skip;
 146             skip = 0;
 147         }
 148         iov++;
 149         addr++;
 150         num--;
 151     }
 152
 153     assert(skip == 0);
 154     return copied;
 155 }
 156
 157 static int virtio_scsi_parse_req(VirtIOSCSIReq *req,
 158                                  unsigned req_size, unsigned resp_size)
 159 {
 160     VirtIODevice *vdev = (VirtIODevice *) req->dev;
 161     size_t in_size, out_size;
 162
 163     if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
 164                    &req->req, req_size) < req_size) {
 165         return -EINVAL;
 166     }
 167
 168     if (qemu_iovec_concat_iov(&req->resp_iov,
 169                               req->elem.in_sg, req->elem.in_num, 0,
 170                               resp_size) < resp_size) {
 171         return -EINVAL;
 172     }
 173
 174     req->resp_size = resp_size;
 175
 176     /* Old BIOSes left some padding by mistake after the req_size/resp_size.
 177      * As a workaround, always consider the first buffer as the virtio-scsi
 178      * request/response, making the payload start at the second element
 179      * of the iovec.
 180      *
 181      * The actual length of the response header, stored in req->resp_size,
 182      * does not change.
 183      *
 184      * TODO: always disable this workaround for virtio 1.0 devices.
 185      */
 186     if (!virtio_vdev_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) {
 187         if (req->elem.out_num) {
 188             req_size = req->elem.out_sg[0].iov_len;
 189         }
 190         if (req->elem.in_num) {
 191             resp_size = req->elem.in_sg[0].iov_len;
 192         }
 193     }
 194
 195     out_size = qemu_sgl_concat(req, req->elem.out_sg,
 196                                &req->elem.out_addr[0], req->elem.out_num,
 197                                req_size);
 198     in_size = qemu_sgl_concat(req, req->elem.in_sg,
 199                               &req->elem.in_addr[0], req->elem.in_num,
 200                               resp_size);
 201
 202     if (out_size && in_size) {
 203         return -ENOTSUP;
 204     }
 205
 206     if (out_size) {
 207         req->mode = SCSI_XFER_TO_DEV;
 208     } else if (in_size) {
 209         req->mode = SCSI_XFER_FROM_DEV;
 210     }
 211
 212     return 0;
 213 }
 214
 215 static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
 216 {
 217     VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s;
 218     VirtIOSCSIReq *req;
 219
 220     req = virtqueue_pop(vq, sizeof(VirtIOSCSIReq) + vs->cdb_size);
 221     if (!req) {
 222         return NULL;
 223     }
 224     virtio_scsi_init_req(s, vq, req);
 225     return req;
 226 }
 227
 228 static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq)
 229 {
 230     VirtIOSCSIReq *req = sreq->hba_private;
 231     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev);
 232     VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
 233     uint32_t n = virtio_get_queue_index(req->vq) - VIRTIO_SCSI_VQ_NUM_FIXED;
 234
 235     assert(n < vs->conf.num_queues);
 236     qemu_put_be32s(f, &n);
 237     qemu_put_virtqueue_element(vdev, f, &req->elem);
 238 }
 239
 240 static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
 241 {
 242     SCSIBus *bus = sreq->bus;
 243     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 244     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
 245     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 246     VirtIOSCSIReq *req;
 247     uint32_t n;
 248
 249     qemu_get_be32s(f, &n);
 250     assert(n < vs->conf.num_queues);
 251     req = qemu_get_virtqueue_element(vdev, f,
 252                                      sizeof(VirtIOSCSIReq) + vs->cdb_size);
 253     virtio_scsi_init_req(s, vs->cmd_vqs[n], req);
 254
 255     if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
 256                               sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) {
 257         error_report("invalid SCSI request migration data");
 258         exit(1);
 259     }
 260
 261     scsi_req_ref(sreq);
 262     req->sreq = sreq;
 263     if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
 264         assert(req->sreq->cmd.mode == req->mode);
 265     }
 266     return req;
 267 }
 268
 269 typedef struct {
 270     Notifier        notifier;
 271     VirtIOSCSIReq  *tmf_req;
 272 } VirtIOSCSICancelNotifier;
 273
 274 static void virtio_scsi_cancel_notify(Notifier *notifier, void *data)
 275 {
 276     VirtIOSCSICancelNotifier *n = container_of(notifier,
 277                                                VirtIOSCSICancelNotifier,
 278                                                notifier);
 279
 280     if (--n->tmf_req->remaining == 0) {
 281         VirtIOSCSIReq *req = n->tmf_req;
 282
 283         trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun),
 284                                    req->req.tmf.tag, req->resp.tmf.response);
 285         virtio_scsi_complete_req(req);
 286     }
 287     g_free(n);
 288 }
 289
 290 static inline void virtio_scsi_ctx_check(VirtIOSCSI *s, SCSIDevice *d)
 291 {
 292     if (s->dataplane_started && d && blk_is_available(d->conf.blk)) {
 293         assert(blk_get_aio_context(d->conf.blk) == s->ctx);
 294     }
 295 }
 296
 297 /* Return 0 if the request is ready to be completed and return to guest;
 298  * -EINPROGRESS if the request is submitted and will be completed later, in the
 299  *  case of async cancellation. */
 300 static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
 301 {
 302     SCSIDevice *d = virtio_scsi_device_get(s, req->req.tmf.lun);
 303     SCSIRequest *r, *next;
 304     BusChild *kid;
 305     int target;
 306     int ret = 0;
 307
 308     virtio_scsi_ctx_check(s, d);
 309     /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE".  */
 310     req->resp.tmf.response = VIRTIO_SCSI_S_OK;
 311
 312     /*
 313      * req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s()
 314      * to avoid compiler errors.
 315      */
 316     req->req.tmf.subtype =
 317         virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype);
 318
 319     trace_virtio_scsi_tmf_req(virtio_scsi_get_lun(req->req.tmf.lun),
 320                               req->req.tmf.tag, req->req.tmf.subtype);
 321
 322     switch (req->req.tmf.subtype) {
 323     case VIRTIO_SCSI_T_TMF_ABORT_TASK:
 324     case VIRTIO_SCSI_T_TMF_QUERY_TASK:
 325         if (!d) {
 326             goto fail;
 327         }
 328         if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
 329             goto incorrect_lun;
 330         }
 331         QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
 332             VirtIOSCSIReq *cmd_req = r->hba_private;
 333             if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) {
 334                 break;
 335             }
 336         }
 337         if (r) {
 338             /*
 339              * Assert that the request has not been completed yet, we
 340              * check for it in the loop above.
 341              */
 342             assert(r->hba_private);
 343             if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
 344                 /* "If the specified command is present in the task set, then
 345                  * return a service response set to FUNCTION SUCCEEDED".
 346                  */
 347                 req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
 348             } else {
 349                 VirtIOSCSICancelNotifier *notifier;
 350
 351                 req->remaining = 1;
 352                 notifier = g_new(VirtIOSCSICancelNotifier, 1);
 353                 notifier->tmf_req = req;
 354                 notifier->notifier.notify = virtio_scsi_cancel_notify;
 355                 scsi_req_cancel_async(r, &notifier->notifier);
 356                 ret = -EINPROGRESS;
 357             }
 358         }
 359         break;
 360
 361     case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
 362         if (!d) {
 363             goto fail;
 364         }
 365         if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
 366             goto incorrect_lun;
 367         }
 368         s->resetting++;
 369         device_cold_reset(&d->qdev);
 370         s->resetting--;
 371         break;
 372
 373     case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
 374     case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
 375     case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
 376         if (!d) {
 377             goto fail;
 378         }
 379         if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
 380             goto incorrect_lun;
 381         }
 382
 383         /* Add 1 to "remaining" until virtio_scsi_do_tmf returns.
 384          * This way, if the bus starts calling back to the notifiers
 385          * even before we finish the loop, virtio_scsi_cancel_notify
 386          * will not complete the TMF too early.
 387          */
 388         req->remaining = 1;
 389         QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
 390             if (r->hba_private) {
 391                 if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) {
 392                     /* "If there is any command present in the task set, then
 393                      * return a service response set to FUNCTION SUCCEEDED".
 394                      */
 395                     req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
 396                     break;
 397                 } else {
 398                     VirtIOSCSICancelNotifier *notifier;
 399
 400                     req->remaining++;
 401                     notifier = g_new(VirtIOSCSICancelNotifier, 1);
 402                     notifier->notifier.notify = virtio_scsi_cancel_notify;
 403                     notifier->tmf_req = req;
 404                     scsi_req_cancel_async(r, &notifier->notifier);
 405                 }
 406             }
 407         }
 408         if (--req->remaining > 0) {
 409             ret = -EINPROGRESS;
 410         }
 411         break;
 412
 413     case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
 414         target = req->req.tmf.lun[1];
 415         s->resetting++;
 416
 417         rcu_read_lock();
 418         QTAILQ_FOREACH_RCU(kid, &s->bus.qbus.children, sibling) {
 419             SCSIDevice *d1 = SCSI_DEVICE(kid->child);
 420             if (d1->channel == 0 && d1->id == target) {
 421                 device_cold_reset(&d1->qdev);
 422             }
 423         }
 424         rcu_read_unlock();
 425
 426         s->resetting--;
 427         break;
 428
 429     case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
 430     default:
 431         req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
 432         break;
 433     }
 434
 435     object_unref(OBJECT(d));
 436     return ret;
 437
 438 incorrect_lun:
 439     req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN;
 440     object_unref(OBJECT(d));
 441     return ret;
 442
 443 fail:
 444     req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET;
 445     object_unref(OBJECT(d));
 446     return ret;
 447 }
 448
 449 static void virtio_scsi_handle_ctrl_req(VirtIOSCSI *s, VirtIOSCSIReq *req)
 450 {
 451     VirtIODevice *vdev = (VirtIODevice *)s;
 452     uint32_t type;
 453     int r = 0;
 454
 455     if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
 456                 &type, sizeof(type)) < sizeof(type)) {
 457         virtio_scsi_bad_req(req);
 458         return;
 459     }
 460
 461     virtio_tswap32s(vdev, &type);
 462     if (type == VIRTIO_SCSI_T_TMF) {
 463         if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq),
 464                     sizeof(VirtIOSCSICtrlTMFResp)) < 0) {
 465             virtio_scsi_bad_req(req);
 466             return;
 467         } else {
 468             r = virtio_scsi_do_tmf(s, req);
 469         }
 470
 471     } else if (type == VIRTIO_SCSI_T_AN_QUERY ||
 472                type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
 473         if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq),
 474                     sizeof(VirtIOSCSICtrlANResp)) < 0) {
 475             virtio_scsi_bad_req(req);
 476             return;
 477         } else {
 478             req->req.an.event_requested =
 479                 virtio_tswap32(VIRTIO_DEVICE(s), req->req.an.event_requested);
 480             trace_virtio_scsi_an_req(virtio_scsi_get_lun(req->req.an.lun),
 481                                      req->req.an.event_requested);
 482             req->resp.an.event_actual = 0;
 483             req->resp.an.response = VIRTIO_SCSI_S_OK;
 484         }
 485     }
 486     if (r == 0) {
 487         if (type == VIRTIO_SCSI_T_TMF)
 488             trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req->req.tmf.lun),
 489                                        req->req.tmf.tag,
 490                                        req->resp.tmf.response);
 491         else if (type == VIRTIO_SCSI_T_AN_QUERY ||
 492                  type == VIRTIO_SCSI_T_AN_SUBSCRIBE)
 493             trace_virtio_scsi_an_resp(virtio_scsi_get_lun(req->req.an.lun),
 494                                       req->resp.an.response);
 495         virtio_scsi_complete_req(req);
 496     } else {
 497         assert(r == -EINPROGRESS);
 498     }
 499 }
 500
 501 static void virtio_scsi_handle_ctrl_vq(VirtIOSCSI *s, VirtQueue *vq)
 502 {
 503     VirtIOSCSIReq *req;
 504
 505     while ((req = virtio_scsi_pop_req(s, vq))) {
 506         virtio_scsi_handle_ctrl_req(s, req);
 507     }
 508 }
 509
 510 /*
 511  * If dataplane is configured but not yet started, do so now and return true on
 512  * success.
 513  *
 514  * Dataplane is started by the core virtio code but virtqueue handler functions
 515  * can also be invoked when a guest kicks before DRIVER_OK, so this helper
 516  * function helps us deal with manually starting ioeventfd in that case.
 517  */
 518 static bool virtio_scsi_defer_to_dataplane(VirtIOSCSI *s)
 519 {
 520     if (!s->ctx || s->dataplane_started) {
 521         return false;
 522     }
 523
 524     virtio_device_start_ioeventfd(&s->parent_obj.parent_obj);
 525     return !s->dataplane_fenced;
 526 }
 527
 528 static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
 529 {
 530     VirtIOSCSI *s = (VirtIOSCSI *)vdev;
 531
 532     if (virtio_scsi_defer_to_dataplane(s)) {
 533         return;
 534     }
 535
 536     virtio_scsi_acquire(s);
 537     virtio_scsi_handle_ctrl_vq(s, vq);
 538     virtio_scsi_release(s);
 539 }
 540
 541 static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req)
 542 {
 543     trace_virtio_scsi_cmd_resp(virtio_scsi_get_lun(req->req.cmd.lun),
 544                                req->req.cmd.tag,
 545                                req->resp.cmd.response,
 546                                req->resp.cmd.status);
 547     /* Sense data is not in req->resp and is copied separately
 548      * in virtio_scsi_command_complete.
 549      */
 550     req->resp_size = sizeof(VirtIOSCSICmdResp);
 551     virtio_scsi_complete_req(req);
 552 }
 553
 554 static void virtio_scsi_command_failed(SCSIRequest *r)
 555 {
 556     VirtIOSCSIReq *req = r->hba_private;
 557
 558     if (r->io_canceled) {
 559         return;
 560     }
 561
 562     req->resp.cmd.status = GOOD;
 563     switch (r->host_status) {
 564     case SCSI_HOST_NO_LUN:
 565         req->resp.cmd.response = VIRTIO_SCSI_S_INCORRECT_LUN;
 566         break;
 567     case SCSI_HOST_BUSY:
 568         req->resp.cmd.response = VIRTIO_SCSI_S_BUSY;
 569         break;
 570     case SCSI_HOST_TIME_OUT:
 571     case SCSI_HOST_ABORTED:
 572         req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED;
 573         break;
 574     case SCSI_HOST_BAD_RESPONSE:
 575         req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
 576         break;
 577     case SCSI_HOST_RESET:
 578         req->resp.cmd.response = VIRTIO_SCSI_S_RESET;
 579         break;
 580     case SCSI_HOST_TRANSPORT_DISRUPTED:
 581         req->resp.cmd.response = VIRTIO_SCSI_S_TRANSPORT_FAILURE;
 582         break;
 583     case SCSI_HOST_TARGET_FAILURE:
 584         req->resp.cmd.response = VIRTIO_SCSI_S_TARGET_FAILURE;
 585         break;
 586     case SCSI_HOST_RESERVATION_ERROR:
 587         req->resp.cmd.response = VIRTIO_SCSI_S_NEXUS_FAILURE;
 588         break;
 589     case SCSI_HOST_ALLOCATION_FAILURE:
 590     case SCSI_HOST_MEDIUM_ERROR:
 591     case SCSI_HOST_ERROR:
 592     default:
 593         req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE;
 594         break;
 595     }
 596     virtio_scsi_complete_cmd_req(req);
 597 }
 598
 599 static void virtio_scsi_command_complete(SCSIRequest *r, size_t resid)
 600 {
 601     VirtIOSCSIReq *req = r->hba_private;
 602     uint8_t sense[SCSI_SENSE_BUF_SIZE];
 603     uint32_t sense_len;
 604     VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
 605
 606     if (r->io_canceled) {
 607         return;
 608     }
 609
 610     req->resp.cmd.response = VIRTIO_SCSI_S_OK;
 611     req->resp.cmd.status = r->status;
 612     if (req->resp.cmd.status == GOOD) {
 613         req->resp.cmd.resid = virtio_tswap32(vdev, resid);
 614     } else {
 615         req->resp.cmd.resid = 0;
 616         sense_len = scsi_req_get_sense(r, sense, sizeof(sense));
 617         sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd));
 618         qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd),
 619                             sense, sense_len);
 620         req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len);
 621     }
 622     virtio_scsi_complete_cmd_req(req);
 623 }
 624
 625 static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd,
 626                                  uint8_t *buf, size_t buf_len,
 627                                  void *hba_private)
 628 {
 629     VirtIOSCSIReq *req = hba_private;
 630
 631     if (cmd->len == 0) {
 632         cmd->len = MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE, SCSI_CMD_BUF_SIZE);
 633         memcpy(cmd->buf, buf, cmd->len);
 634     }
 635
 636     /* Extract the direction and mode directly from the request, for
 637      * host device passthrough.
 638      */
 639     cmd->xfer = req->qsgl.size;
 640     cmd->mode = req->mode;
 641     return 0;
 642 }
 643
 644 static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
 645 {
 646     VirtIOSCSIReq *req = r->hba_private;
 647
 648     return &req->qsgl;
 649 }
 650
 651 static void virtio_scsi_request_cancelled(SCSIRequest *r)
 652 {
 653     VirtIOSCSIReq *req = r->hba_private;
 654
 655     if (!req) {
 656         return;
 657     }
 658     if (req->dev->resetting) {
 659         req->resp.cmd.response = VIRTIO_SCSI_S_RESET;
 660     } else {
 661         req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED;
 662     }
 663     virtio_scsi_complete_cmd_req(req);
 664 }
 665
 666 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
 667 {
 668     req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE;
 669     virtio_scsi_complete_cmd_req(req);
 670 }
 671
 672 static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req)
 673 {
 674     VirtIOSCSICommon *vs = &s->parent_obj;
 675     SCSIDevice *d;
 676     int rc;
 677
 678     rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
 679                                sizeof(VirtIOSCSICmdResp) + vs->sense_size);
 680     if (rc < 0) {
 681         if (rc == -ENOTSUP) {
 682             virtio_scsi_fail_cmd_req(req);
 683             return -ENOTSUP;
 684         } else {
 685             virtio_scsi_bad_req(req);
 686             return -EINVAL;
 687         }
 688     }
 689     trace_virtio_scsi_cmd_req(virtio_scsi_get_lun(req->req.cmd.lun),
 690                               req->req.cmd.tag, req->req.cmd.cdb[0]);
 691
 692     d = virtio_scsi_device_get(s, req->req.cmd.lun);
 693     if (!d) {
 694         req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
 695         virtio_scsi_complete_cmd_req(req);
 696         return -ENOENT;
 697     }
 698     virtio_scsi_ctx_check(s, d);
 699     req->sreq = scsi_req_new(d, req->req.cmd.tag,
 700                              virtio_scsi_get_lun(req->req.cmd.lun),
 701                              req->req.cmd.cdb, vs->cdb_size, req);
 702
 703     if (req->sreq->cmd.mode != SCSI_XFER_NONE
 704         && (req->sreq->cmd.mode != req->mode ||
 705             req->sreq->cmd.xfer > req->qsgl.size)) {
 706         req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN;
 707         virtio_scsi_complete_cmd_req(req);
 708         object_unref(OBJECT(d));
 709         return -ENOBUFS;
 710     }
 711     scsi_req_ref(req->sreq);
 712     blk_io_plug(d->conf.blk);
 713     object_unref(OBJECT(d));
 714     return 0;
 715 }
 716
 717 static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req)
 718 {
 719     SCSIRequest *sreq = req->sreq;
 720     if (scsi_req_enqueue(sreq)) {
 721         scsi_req_continue(sreq);
 722     }
 723     blk_io_unplug(sreq->dev->conf.blk);
 724     scsi_req_unref(sreq);
 725 }
 726
 727 static void virtio_scsi_handle_cmd_vq(VirtIOSCSI *s, VirtQueue *vq)
 728 {
 729     VirtIOSCSIReq *req, *next;
 730     int ret = 0;
 731     bool suppress_notifications = virtio_queue_get_notification(vq);
 732
 733     QTAILQ_HEAD(, VirtIOSCSIReq) reqs = QTAILQ_HEAD_INITIALIZER(reqs);
 734
 735     do {
 736         if (suppress_notifications) {
 737             virtio_queue_set_notification(vq, 0);
 738         }
 739
 740         while ((req = virtio_scsi_pop_req(s, vq))) {
 741             ret = virtio_scsi_handle_cmd_req_prepare(s, req);
 742             if (!ret) {
 743                 QTAILQ_INSERT_TAIL(&reqs, req, next);
 744             } else if (ret == -EINVAL) {
 745                 /* The device is broken and shouldn't process any request */
 746                 while (!QTAILQ_EMPTY(&reqs)) {
 747                     req = QTAILQ_FIRST(&reqs);
 748                     QTAILQ_REMOVE(&reqs, req, next);
 749                     blk_io_unplug(req->sreq->dev->conf.blk);
 750                     scsi_req_unref(req->sreq);
 751                     virtqueue_detach_element(req->vq, &req->elem, 0);
 752                     virtio_scsi_free_req(req);
 753                 }
 754             }
 755         }
 756
 757         if (suppress_notifications) {
 758             virtio_queue_set_notification(vq, 1);
 759         }
 760     } while (ret != -EINVAL && !virtio_queue_empty(vq));
 761
 762     QTAILQ_FOREACH_SAFE(req, &reqs, next, next) {
 763         virtio_scsi_handle_cmd_req_submit(s, req);
 764     }
 765 }
 766
 767 static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
 768 {
 769     /* use non-QOM casts in the data path */
 770     VirtIOSCSI *s = (VirtIOSCSI *)vdev;
 771
 772     if (virtio_scsi_defer_to_dataplane(s)) {
 773         return;
 774     }
 775
 776     virtio_scsi_acquire(s);
 777     virtio_scsi_handle_cmd_vq(s, vq);
 778     virtio_scsi_release(s);
 779 }
 780
 781 static void virtio_scsi_get_config(VirtIODevice *vdev,
 782                                    uint8_t *config)
 783 {
 784     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 785     VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev);
 786
 787     virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues);
 788     virtio_stl_p(vdev, &scsiconf->seg_max,
 789                  s->conf.seg_max_adjust ? s->conf.virtqueue_size - 2 : 128 - 2);
 790     virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors);
 791     virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun);
 792     virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
 793     virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size);
 794     virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size);
 795     virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
 796     virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
 797     virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
 798 }
 799
 800 static void virtio_scsi_set_config(VirtIODevice *vdev,
 801                                    const uint8_t *config)
 802 {
 803     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 804     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 805
 806     if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 ||
 807         (uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) {
 808         virtio_error(vdev,
 809                      "bad data written to virtio-scsi configuration space");
 810         return;
 811     }
 812
 813     vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size);
 814     vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size);
 815 }
 816
 817 static uint64_t virtio_scsi_get_features(VirtIODevice *vdev,
 818                                          uint64_t requested_features,
 819                                          Error **errp)
 820 {
 821     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 822
 823     /* Firstly sync all virtio-scsi possible supported features */
 824     requested_features |= s->host_features;
 825     return requested_features;
 826 }
 827
 828 static void virtio_scsi_reset(VirtIODevice *vdev)
 829 {
 830     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 831     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 832
 833     assert(!s->dataplane_started);
 834     s->resetting++;
 835     bus_cold_reset(BUS(&s->bus));
 836     s->resetting--;
 837
 838     vs->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE;
 839     vs->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE;
 840     s->events_dropped = false;
 841 }
 842
 843 static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
 844                                    uint32_t event, uint32_t reason)
 845 {
 846     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
 847     VirtIOSCSIReq *req;
 848     VirtIOSCSIEvent *evt;
 849     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 850
 851     if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 852         return;
 853     }
 854
 855     req = virtio_scsi_pop_req(s, vs->event_vq);
 856     if (!req) {
 857         s->events_dropped = true;
 858         return;
 859     }
 860
 861     if (s->events_dropped) {
 862         event |= VIRTIO_SCSI_T_EVENTS_MISSED;
 863         s->events_dropped = false;
 864     }
 865
 866     if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) {
 867         virtio_scsi_bad_req(req);
 868         return;
 869     }
 870
 871     evt = &req->resp.event;
 872     memset(evt, 0, sizeof(VirtIOSCSIEvent));
 873     evt->event = virtio_tswap32(vdev, event);
 874     evt->reason = virtio_tswap32(vdev, reason);
 875     if (!dev) {
 876         assert(event == VIRTIO_SCSI_T_EVENTS_MISSED);
 877     } else {
 878         evt->lun[0] = 1;
 879         evt->lun[1] = dev->id;
 880
 881         /* Linux wants us to keep the same encoding we use for REPORT LUNS.  */
 882         if (dev->lun >= 256) {
 883             evt->lun[2] = (dev->lun >> 8) | 0x40;
 884         }
 885         evt->lun[3] = dev->lun & 0xFF;
 886     }
 887     trace_virtio_scsi_event(virtio_scsi_get_lun(evt->lun), event, reason);
 888
 889     virtio_scsi_complete_req(req);
 890 }
 891
 892 static void virtio_scsi_handle_event_vq(VirtIOSCSI *s, VirtQueue *vq)
 893 {
 894     if (s->events_dropped) {
 895         virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
 896     }
 897 }
 898
 899 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
 900 {
 901     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 902
 903     if (virtio_scsi_defer_to_dataplane(s)) {
 904         return;
 905     }
 906
 907     virtio_scsi_acquire(s);
 908     virtio_scsi_handle_event_vq(s, vq);
 909     virtio_scsi_release(s);
 910 }
 911
 912 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
 913 {
 914     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
 915     VirtIODevice *vdev = VIRTIO_DEVICE(s);
 916
 917     if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_CHANGE) &&
 918         dev->type != TYPE_ROM) {
 919         virtio_scsi_acquire(s);
 920         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
 921                                sense.asc | (sense.ascq << 8));
 922         virtio_scsi_release(s);
 923     }
 924 }
 925
 926 static void virtio_scsi_pre_hotplug(HotplugHandler *hotplug_dev,
 927                                     DeviceState *dev, Error **errp)
 928 {
 929     SCSIDevice *sd = SCSI_DEVICE(dev);
 930     sd->hba_supports_iothread = true;
 931 }
 932
 933 static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
 934                                 Error **errp)
 935 {
 936     VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
 937     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 938     SCSIDevice *sd = SCSI_DEVICE(dev);
 939     AioContext *old_context;
 940     int ret;
 941
 942     if (s->ctx && !s->dataplane_fenced) {
 943         if (blk_op_is_blocked(sd->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) {
 944             return;
 945         }
 946         old_context = blk_get_aio_context(sd->conf.blk);
 947         aio_context_acquire(old_context);
 948         ret = blk_set_aio_context(sd->conf.blk, s->ctx, errp);
 949         aio_context_release(old_context);
 950         if (ret < 0) {
 951             return;
 952         }
 953     }
 954
 955     if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
 956         virtio_scsi_acquire(s);
 957         virtio_scsi_push_event(s, sd,
 958                                VIRTIO_SCSI_T_TRANSPORT_RESET,
 959                                VIRTIO_SCSI_EVT_RESET_RESCAN);
 960         scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED));
 961         virtio_scsi_release(s);
 962     }
 963 }
 964
 965 static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev,
 966                                   Error **errp)
 967 {
 968     VirtIODevice *vdev = VIRTIO_DEVICE(hotplug_dev);
 969     VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 970     SCSIDevice *sd = SCSI_DEVICE(dev);
 971     AioContext *ctx = s->ctx ?: qemu_get_aio_context();
 972
 973     if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) {
 974         virtio_scsi_acquire(s);
 975         virtio_scsi_push_event(s, sd,
 976                                VIRTIO_SCSI_T_TRANSPORT_RESET,
 977                                VIRTIO_SCSI_EVT_RESET_REMOVED);
 978         scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED));
 979         virtio_scsi_release(s);
 980     }
 981
 982     aio_disable_external(ctx);
 983     qdev_simple_device_unplug_cb(hotplug_dev, dev, errp);
 984     aio_enable_external(ctx);
 985
 986     if (s->ctx) {
 987         virtio_scsi_acquire(s);
 988         /* If other users keep the BlockBackend in the iothread, that's ok */
 989         blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL);
 990         virtio_scsi_release(s);
 991     }
 992 }
 993
 994 static struct SCSIBusInfo virtio_scsi_scsi_info = {
 995     .tcq = true,
 996     .max_channel = VIRTIO_SCSI_MAX_CHANNEL,
 997     .max_target = VIRTIO_SCSI_MAX_TARGET,
 998     .max_lun = VIRTIO_SCSI_MAX_LUN,
 999
1000     .complete = virtio_scsi_command_complete,
1001     .fail = virtio_scsi_command_failed,
1002     .cancel = virtio_scsi_request_cancelled,
1003     .change = virtio_scsi_change,
1004     .parse_cdb = virtio_scsi_parse_cdb,
1005     .get_sg_list = virtio_scsi_get_sg_list,
1006     .save_request = virtio_scsi_save_request,
1007     .load_request = virtio_scsi_load_request,
1008 };
1009
1010 void virtio_scsi_common_realize(DeviceState *dev,
1011                                 VirtIOHandleOutput ctrl,
1012                                 VirtIOHandleOutput evt,
1013                                 VirtIOHandleOutput cmd,
1014                                 Error **errp)
1015 {
1016     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1017     VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev);
1018     int i;
1019
1020     virtio_init(vdev, VIRTIO_ID_SCSI, sizeof(VirtIOSCSIConfig));
1021
1022     if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
1023         s->conf.num_queues = 1;
1024     }
1025     if (s->conf.num_queues == 0 ||
1026             s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) {
1027         error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
1028                          "must be a positive integer less than %d.",
1029                    s->conf.num_queues,
1030                    VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED);
1031         virtio_cleanup(vdev);
1032         return;
1033     }
1034     if (s->conf.virtqueue_size <= 2) {
1035         error_setg(errp, "invalid virtqueue_size property (= %" PRIu32 "), "
1036                    "must be > 2", s->conf.virtqueue_size);
1037         return;
1038     }
1039     s->cmd_vqs = g_new0(VirtQueue *, s->conf.num_queues);
1040     s->sense_size = VIRTIO_SCSI_SENSE_DEFAULT_SIZE;
1041     s->cdb_size = VIRTIO_SCSI_CDB_DEFAULT_SIZE;
1042
1043     s->ctrl_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, ctrl);
1044     s->event_vq = virtio_add_queue(vdev, s->conf.virtqueue_size, evt);
1045     for (i = 0; i < s->conf.num_queues; i++) {
1046         s->cmd_vqs[i] = virtio_add_queue(vdev, s->conf.virtqueue_size, cmd);
1047     }
1048 }
1049
1050 static void virtio_scsi_device_realize(DeviceState *dev, Error **errp)
1051 {
1052     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1053     VirtIOSCSI *s = VIRTIO_SCSI(dev);
1054     Error *err = NULL;
1055
1056     virtio_scsi_common_realize(dev,
1057                                virtio_scsi_handle_ctrl,
1058                                virtio_scsi_handle_event,
1059                                virtio_scsi_handle_cmd,
1060                                &err);
1061     if (err != NULL) {
1062         error_propagate(errp, err);
1063         return;
1064     }
1065
1066     scsi_bus_init_named(&s->bus, sizeof(s->bus), dev,
1067                        &virtio_scsi_scsi_info, vdev->bus_name);
1068     /* override default SCSI bus hotplug-handler, with virtio-scsi's one */
1069     qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev));
1070
1071     virtio_scsi_dataplane_setup(s, errp);
1072 }
1073
1074 void virtio_scsi_common_unrealize(DeviceState *dev)
1075 {
1076     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1077     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
1078     int i;
1079
1080     virtio_delete_queue(vs->ctrl_vq);
1081     virtio_delete_queue(vs->event_vq);
1082     for (i = 0; i < vs->conf.num_queues; i++) {
1083         virtio_delete_queue(vs->cmd_vqs[i]);
1084     }
1085     g_free(vs->cmd_vqs);
1086     virtio_cleanup(vdev);
1087 }
1088
1089 static void virtio_scsi_device_unrealize(DeviceState *dev)
1090 {
1091     VirtIOSCSI *s = VIRTIO_SCSI(dev);
1092
1093     qbus_set_hotplug_handler(BUS(&s->bus), NULL);
1094     virtio_scsi_common_unrealize(dev);
1095 }
1096
1097 static Property virtio_scsi_properties[] = {
1098     DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues,
1099                        VIRTIO_SCSI_AUTO_NUM_QUEUES),
1100     DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI,
1101                                          parent_obj.conf.virtqueue_size, 256),
1102     DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI,
1103                       parent_obj.conf.seg_max_adjust, true),
1104     DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI, parent_obj.conf.max_sectors,
1105                                                   0xFFFF),
1106     DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI, parent_obj.conf.cmd_per_lun,
1107                                                   128),
1108     DEFINE_PROP_BIT("hotplug", VirtIOSCSI, host_features,
1109                                            VIRTIO_SCSI_F_HOTPLUG, true),
1110     DEFINE_PROP_BIT("param_change", VirtIOSCSI, host_features,
1111                                                 VIRTIO_SCSI_F_CHANGE, true),
1112     DEFINE_PROP_LINK("iothread", VirtIOSCSI, parent_obj.conf.iothread,
1113                      TYPE_IOTHREAD, IOThread *),
1114     DEFINE_PROP_END_OF_LIST(),
1115 };
1116
1117 static const VMStateDescription vmstate_virtio_scsi = {
1118     .name = "virtio-scsi",
1119     .minimum_version_id = 1,
1120     .version_id = 1,
1121     .fields = (VMStateField[]) {
1122         VMSTATE_VIRTIO_DEVICE,
1123         VMSTATE_END_OF_LIST()
1124     },
1125 };
1126
1127 static void virtio_scsi_common_class_init(ObjectClass *klass, void *data)
1128 {
1129     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1130     DeviceClass *dc = DEVICE_CLASS(klass);
1131
1132     vdc->get_config = virtio_scsi_get_config;
1133     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1134 }
1135
1136 static void virtio_scsi_class_init(ObjectClass *klass, void *data)
1137 {
1138     DeviceClass *dc = DEVICE_CLASS(klass);
1139     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1140     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
1141
1142     device_class_set_props(dc, virtio_scsi_properties);
1143     dc->vmsd = &vmstate_virtio_scsi;
1144     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1145     vdc->realize = virtio_scsi_device_realize;
1146     vdc->unrealize = virtio_scsi_device_unrealize;
1147     vdc->set_config = virtio_scsi_set_config;
1148     vdc->get_features = virtio_scsi_get_features;
1149     vdc->reset = virtio_scsi_reset;
1150     vdc->start_ioeventfd = virtio_scsi_dataplane_start;
1151     vdc->stop_ioeventfd = virtio_scsi_dataplane_stop;
1152     hc->pre_plug = virtio_scsi_pre_hotplug;
1153     hc->plug = virtio_scsi_hotplug;
1154     hc->unplug = virtio_scsi_hotunplug;
1155 }
1156
1157 static const TypeInfo virtio_scsi_common_info = {
1158     .name = TYPE_VIRTIO_SCSI_COMMON,
1159     .parent = TYPE_VIRTIO_DEVICE,
1160     .instance_size = sizeof(VirtIOSCSICommon),
1161     .abstract = true,
1162     .class_init = virtio_scsi_common_class_init,
1163 };
1164
1165 static const TypeInfo virtio_scsi_info = {
1166     .name = TYPE_VIRTIO_SCSI,
1167     .parent = TYPE_VIRTIO_SCSI_COMMON,
1168     .instance_size = sizeof(VirtIOSCSI),
1169     .class_init = virtio_scsi_class_init,
1170     .interfaces = (InterfaceInfo[]) {
1171         { TYPE_HOTPLUG_HANDLER },
1172         { }
1173     }
1174 };
1175
1176 static void virtio_register_types(void)
1177 {
1178     type_register_static(&virtio_scsi_common_info);
1179     type_register_static(&virtio_scsi_info);
1180 }
1181
1182 type_init(virtio_register_types)