hw/virtio-blk.c

   1 /*
   2  * Virtio Block Device
   3  *
   4  * Copyright IBM, Corp. 2007
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "qemu-common.h"
  15 #include "qemu/error-report.h"
  16 #include "trace.h"
  17 #include "hw/block-common.h"
  18 #include "sysemu/blockdev.h"
  19 #include "hw/virtio-blk.h"
  20 #include "hw/scsi-defs.h"
  21 #ifdef __linux__
  22 # include <scsi/sg.h>
  23 #endif
  24 #include "hw/virtio-bus.h"
  25
  26 /*
  27  * Moving to QOM later in this series.
  28  */
  29 static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
  30 {
  31     return (VirtIOBlock *)vdev;
  32 }
  33
  34 typedef struct VirtIOBlockReq
  35 {
  36     VirtIOBlock *dev;
  37     VirtQueueElement elem;
  38     struct virtio_blk_inhdr *in;
  39     struct virtio_blk_outhdr *out;
  40     struct virtio_scsi_inhdr *scsi;
  41     QEMUIOVector qiov;
  42     struct VirtIOBlockReq *next;
  43     BlockAcctCookie acct;
  44 } VirtIOBlockReq;
  45
  46 static void virtio_blk_req_complete(VirtIOBlockReq *req, int status)
  47 {
  48     VirtIOBlock *s = req->dev;
  49
  50     trace_virtio_blk_req_complete(req, status);
  51
  52     stb_p(&req->in->status, status);
  53     virtqueue_push(s->vq, &req->elem, req->qiov.size + sizeof(*req->in));
  54     virtio_notify(&s->vdev, s->vq);
  55 }
  56
  57 static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
  58     bool is_read)
  59 {
  60     BlockErrorAction action = bdrv_get_error_action(req->dev->bs, is_read, error);
  61     VirtIOBlock *s = req->dev;
  62
  63     if (action == BDRV_ACTION_STOP) {
  64         req->next = s->rq;
  65         s->rq = req;
  66     } else if (action == BDRV_ACTION_REPORT) {
  67         virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
  68         bdrv_acct_done(s->bs, &req->acct);
  69         g_free(req);
  70     }
  71
  72     bdrv_error_action(s->bs, action, is_read, error);
  73     return action != BDRV_ACTION_IGNORE;
  74 }
  75
  76 static void virtio_blk_rw_complete(void *opaque, int ret)
  77 {
  78     VirtIOBlockReq *req = opaque;
  79
  80     trace_virtio_blk_rw_complete(req, ret);
  81
  82     if (ret) {
  83         bool is_read = !(ldl_p(&req->out->type) & VIRTIO_BLK_T_OUT);
  84         if (virtio_blk_handle_rw_error(req, -ret, is_read))
  85             return;
  86     }
  87
  88     virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
  89     bdrv_acct_done(req->dev->bs, &req->acct);
  90     g_free(req);
  91 }
  92
  93 static void virtio_blk_flush_complete(void *opaque, int ret)
  94 {
  95     VirtIOBlockReq *req = opaque;
  96
  97     if (ret) {
  98         if (virtio_blk_handle_rw_error(req, -ret, 0)) {
  99             return;
 100         }
 101     }
 102
 103     virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
 104     bdrv_acct_done(req->dev->bs, &req->acct);
 105     g_free(req);
 106 }
 107
 108 static VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s)
 109 {
 110     VirtIOBlockReq *req = g_malloc(sizeof(*req));
 111     req->dev = s;
 112     req->qiov.size = 0;
 113     req->next = NULL;
 114     return req;
 115 }
 116
 117 static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s)
 118 {
 119     VirtIOBlockReq *req = virtio_blk_alloc_request(s);
 120
 121     if (req != NULL) {
 122         if (!virtqueue_pop(s->vq, &req->elem)) {
 123             g_free(req);
 124             return NULL;
 125         }
 126     }
 127
 128     return req;
 129 }
 130
 131 static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
 132 {
 133 #ifdef __linux__
 134     int ret;
 135     int i;
 136 #endif
 137     int status = VIRTIO_BLK_S_OK;
 138
 139     /*
 140      * We require at least one output segment each for the virtio_blk_outhdr
 141      * and the SCSI command block.
 142      *
 143      * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
 144      * and the sense buffer pointer in the input segments.
 145      */
 146     if (req->elem.out_num < 2 || req->elem.in_num < 3) {
 147         virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
 148         g_free(req);
 149         return;
 150     }
 151
 152     /*
 153      * The scsi inhdr is placed in the second-to-last input segment, just
 154      * before the regular inhdr.
 155      */
 156     req->scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
 157
 158     if (!req->dev->blk.scsi) {
 159         status = VIRTIO_BLK_S_UNSUPP;
 160         goto fail;
 161     }
 162
 163     /*
 164      * No support for bidirection commands yet.
 165      */
 166     if (req->elem.out_num > 2 && req->elem.in_num > 3) {
 167         status = VIRTIO_BLK_S_UNSUPP;
 168         goto fail;
 169     }
 170
 171 #ifdef __linux__
 172     struct sg_io_hdr hdr;
 173     memset(&hdr, 0, sizeof(struct sg_io_hdr));
 174     hdr.interface_id = 'S';
 175     hdr.cmd_len = req->elem.out_sg[1].iov_len;
 176     hdr.cmdp = req->elem.out_sg[1].iov_base;
 177     hdr.dxfer_len = 0;
 178
 179     if (req->elem.out_num > 2) {
 180         /*
 181          * If there are more than the minimally required 2 output segments
 182          * there is write payload starting from the third iovec.
 183          */
 184         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 185         hdr.iovec_count = req->elem.out_num - 2;
 186
 187         for (i = 0; i < hdr.iovec_count; i++)
 188             hdr.dxfer_len += req->elem.out_sg[i + 2].iov_len;
 189
 190         hdr.dxferp = req->elem.out_sg + 2;
 191
 192     } else if (req->elem.in_num > 3) {
 193         /*
 194          * If we have more than 3 input segments the guest wants to actually
 195          * read data.
 196          */
 197         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 198         hdr.iovec_count = req->elem.in_num - 3;
 199         for (i = 0; i < hdr.iovec_count; i++)
 200             hdr.dxfer_len += req->elem.in_sg[i].iov_len;
 201
 202         hdr.dxferp = req->elem.in_sg;
 203     } else {
 204         /*
 205          * Some SCSI commands don't actually transfer any data.
 206          */
 207         hdr.dxfer_direction = SG_DXFER_NONE;
 208     }
 209
 210     hdr.sbp = req->elem.in_sg[req->elem.in_num - 3].iov_base;
 211     hdr.mx_sb_len = req->elem.in_sg[req->elem.in_num - 3].iov_len;
 212
 213     ret = bdrv_ioctl(req->dev->bs, SG_IO, &hdr);
 214     if (ret) {
 215         status = VIRTIO_BLK_S_UNSUPP;
 216         goto fail;
 217     }
 218
 219     /*
 220      * From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi)
 221      * clear the masked_status field [hence status gets cleared too, see
 222      * block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED
 223      * status has occurred.  However they do set DRIVER_SENSE in driver_status
 224      * field. Also a (sb_len_wr > 0) indicates there is a sense buffer.
 225      */
 226     if (hdr.status == 0 && hdr.sb_len_wr > 0) {
 227         hdr.status = CHECK_CONDITION;
 228     }
 229
 230     stl_p(&req->scsi->errors,
 231           hdr.status | (hdr.msg_status << 8) |
 232           (hdr.host_status << 16) | (hdr.driver_status << 24));
 233     stl_p(&req->scsi->residual, hdr.resid);
 234     stl_p(&req->scsi->sense_len, hdr.sb_len_wr);
 235     stl_p(&req->scsi->data_len, hdr.dxfer_len);
 236
 237     virtio_blk_req_complete(req, status);
 238     g_free(req);
 239     return;
 240 #else
 241     abort();
 242 #endif
 243
 244 fail:
 245     /* Just put anything nonzero so that the ioctl fails in the guest.  */
 246     stl_p(&req->scsi->errors, 255);
 247     virtio_blk_req_complete(req, status);
 248     g_free(req);
 249 }
 250
 251 typedef struct MultiReqBuffer {
 252     BlockRequest        blkreq[32];
 253     unsigned int        num_writes;
 254 } MultiReqBuffer;
 255
 256 static void virtio_submit_multiwrite(BlockDriverState *bs, MultiReqBuffer *mrb)
 257 {
 258     int i, ret;
 259
 260     if (!mrb->num_writes) {
 261         return;
 262     }
 263
 264     ret = bdrv_aio_multiwrite(bs, mrb->blkreq, mrb->num_writes);
 265     if (ret != 0) {
 266         for (i = 0; i < mrb->num_writes; i++) {
 267             if (mrb->blkreq[i].error) {
 268                 virtio_blk_rw_complete(mrb->blkreq[i].opaque, -EIO);
 269             }
 270         }
 271     }
 272
 273     mrb->num_writes = 0;
 274 }
 275
 276 static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb)
 277 {
 278     bdrv_acct_start(req->dev->bs, &req->acct, 0, BDRV_ACCT_FLUSH);
 279
 280     /*
 281      * Make sure all outstanding writes are posted to the backing device.
 282      */
 283     virtio_submit_multiwrite(req->dev->bs, mrb);
 284     bdrv_aio_flush(req->dev->bs, virtio_blk_flush_complete, req);
 285 }
 286
 287 static void virtio_blk_handle_write(VirtIOBlockReq *req, MultiReqBuffer *mrb)
 288 {
 289     BlockRequest *blkreq;
 290     uint64_t sector;
 291
 292     sector = ldq_p(&req->out->sector);
 293
 294     bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BDRV_ACCT_WRITE);
 295
 296     trace_virtio_blk_handle_write(req, sector, req->qiov.size / 512);
 297
 298     if (sector & req->dev->sector_mask) {
 299         virtio_blk_rw_complete(req, -EIO);
 300         return;
 301     }
 302     if (req->qiov.size % req->dev->conf->logical_block_size) {
 303         virtio_blk_rw_complete(req, -EIO);
 304         return;
 305     }
 306
 307     if (mrb->num_writes == 32) {
 308         virtio_submit_multiwrite(req->dev->bs, mrb);
 309     }
 310
 311     blkreq = &mrb->blkreq[mrb->num_writes];
 312     blkreq->sector = sector;
 313     blkreq->nb_sectors = req->qiov.size / BDRV_SECTOR_SIZE;
 314     blkreq->qiov = &req->qiov;
 315     blkreq->cb = virtio_blk_rw_complete;
 316     blkreq->opaque = req;
 317     blkreq->error = 0;
 318
 319     mrb->num_writes++;
 320 }
 321
 322 static void virtio_blk_handle_read(VirtIOBlockReq *req)
 323 {
 324     uint64_t sector;
 325
 326     sector = ldq_p(&req->out->sector);
 327
 328     bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BDRV_ACCT_READ);
 329
 330     trace_virtio_blk_handle_read(req, sector, req->qiov.size / 512);
 331
 332     if (sector & req->dev->sector_mask) {
 333         virtio_blk_rw_complete(req, -EIO);
 334         return;
 335     }
 336     if (req->qiov.size % req->dev->conf->logical_block_size) {
 337         virtio_blk_rw_complete(req, -EIO);
 338         return;
 339     }
 340     bdrv_aio_readv(req->dev->bs, sector, &req->qiov,
 341                    req->qiov.size / BDRV_SECTOR_SIZE,
 342                    virtio_blk_rw_complete, req);
 343 }
 344
 345 static void virtio_blk_handle_request(VirtIOBlockReq *req,
 346     MultiReqBuffer *mrb)
 347 {
 348     uint32_t type;
 349
 350     if (req->elem.out_num < 1 || req->elem.in_num < 1) {
 351         error_report("virtio-blk missing headers");
 352         exit(1);
 353     }
 354
 355     if (req->elem.out_sg[0].iov_len < sizeof(*req->out) ||
 356         req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) {
 357         error_report("virtio-blk header not in correct element");
 358         exit(1);
 359     }
 360
 361     req->out = (void *)req->elem.out_sg[0].iov_base;
 362     req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base;
 363
 364     type = ldl_p(&req->out->type);
 365
 366     if (type & VIRTIO_BLK_T_FLUSH) {
 367         virtio_blk_handle_flush(req, mrb);
 368     } else if (type & VIRTIO_BLK_T_SCSI_CMD) {
 369         virtio_blk_handle_scsi(req);
 370     } else if (type & VIRTIO_BLK_T_GET_ID) {
 371         VirtIOBlock *s = req->dev;
 372
 373         /*
 374          * NB: per existing s/n string convention the string is
 375          * terminated by '\0' only when shorter than buffer.
 376          */
 377         strncpy(req->elem.in_sg[0].iov_base,
 378                 s->blk.serial ? s->blk.serial : "",
 379                 MIN(req->elem.in_sg[0].iov_len, VIRTIO_BLK_ID_BYTES));
 380         virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
 381         g_free(req);
 382     } else if (type & VIRTIO_BLK_T_OUT) {
 383         qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
 384                                  req->elem.out_num - 1);
 385         virtio_blk_handle_write(req, mrb);
 386     } else if (type == VIRTIO_BLK_T_IN || type == VIRTIO_BLK_T_BARRIER) {
 387         /* VIRTIO_BLK_T_IN is 0, so we can't just & it. */
 388         qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
 389                                  req->elem.in_num - 1);
 390         virtio_blk_handle_read(req);
 391     } else {
 392         virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
 393         g_free(req);
 394     }
 395 }
 396
 397 static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
 398 {
 399     VirtIOBlock *s = to_virtio_blk(vdev);
 400     VirtIOBlockReq *req;
 401     MultiReqBuffer mrb = {
 402         .num_writes = 0,
 403     };
 404
 405 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
 406     /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start
 407      * dataplane here instead of waiting for .set_status().
 408      */
 409     if (s->dataplane) {
 410         virtio_blk_data_plane_start(s->dataplane);
 411         return;
 412     }
 413 #endif
 414
 415     while ((req = virtio_blk_get_request(s))) {
 416         virtio_blk_handle_request(req, &mrb);
 417     }
 418
 419     virtio_submit_multiwrite(s->bs, &mrb);
 420
 421     /*
 422      * FIXME: Want to check for completions before returning to guest mode,
 423      * so cached reads and writes are reported as quickly as possible. But
 424      * that should be done in the generic block layer.
 425      */
 426 }
 427
 428 static void virtio_blk_dma_restart_bh(void *opaque)
 429 {
 430     VirtIOBlock *s = opaque;
 431     VirtIOBlockReq *req = s->rq;
 432     MultiReqBuffer mrb = {
 433         .num_writes = 0,
 434     };
 435
 436     qemu_bh_delete(s->bh);
 437     s->bh = NULL;
 438
 439     s->rq = NULL;
 440
 441     while (req) {
 442         virtio_blk_handle_request(req, &mrb);
 443         req = req->next;
 444     }
 445
 446     virtio_submit_multiwrite(s->bs, &mrb);
 447 }
 448
 449 static void virtio_blk_dma_restart_cb(void *opaque, int running,
 450                                       RunState state)
 451 {
 452     VirtIOBlock *s = opaque;
 453
 454     if (!running) {
 455         return;
 456     }
 457
 458     if (!s->bh) {
 459         s->bh = qemu_bh_new(virtio_blk_dma_restart_bh, s);
 460         qemu_bh_schedule(s->bh);
 461     }
 462 }
 463
 464 static void virtio_blk_reset(VirtIODevice *vdev)
 465 {
 466 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
 467     VirtIOBlock *s = to_virtio_blk(vdev);
 468
 469     if (s->dataplane) {
 470         virtio_blk_data_plane_stop(s->dataplane);
 471     }
 472 #endif
 473
 474     /*
 475      * This should cancel pending requests, but can't do nicely until there
 476      * are per-device request lists.
 477      */
 478     bdrv_drain_all();
 479 }
 480
 481 /* coalesce internal state, copy to pci i/o region 0
 482  */
 483 static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
 484 {
 485     VirtIOBlock *s = to_virtio_blk(vdev);
 486     struct virtio_blk_config blkcfg;
 487     uint64_t capacity;
 488     int blk_size = s->conf->logical_block_size;
 489
 490     bdrv_get_geometry(s->bs, &capacity);
 491     memset(&blkcfg, 0, sizeof(blkcfg));
 492     stq_raw(&blkcfg.capacity, capacity);
 493     stl_raw(&blkcfg.seg_max, 128 - 2);
 494     stw_raw(&blkcfg.cylinders, s->conf->cyls);
 495     stl_raw(&blkcfg.blk_size, blk_size);
 496     stw_raw(&blkcfg.min_io_size, s->conf->min_io_size / blk_size);
 497     stw_raw(&blkcfg.opt_io_size, s->conf->opt_io_size / blk_size);
 498     blkcfg.heads = s->conf->heads;
 499     /*
 500      * We must ensure that the block device capacity is a multiple of
 501      * the logical block size. If that is not the case, lets use
 502      * sector_mask to adopt the geometry to have a correct picture.
 503      * For those devices where the capacity is ok for the given geometry
 504      * we dont touch the sector value of the geometry, since some devices
 505      * (like s390 dasd) need a specific value. Here the capacity is already
 506      * cyls*heads*secs*blk_size and the sector value is not block size
 507      * divided by 512 - instead it is the amount of blk_size blocks
 508      * per track (cylinder).
 509      */
 510     if (bdrv_getlength(s->bs) /  s->conf->heads / s->conf->secs % blk_size) {
 511         blkcfg.sectors = s->conf->secs & ~s->sector_mask;
 512     } else {
 513         blkcfg.sectors = s->conf->secs;
 514     }
 515     blkcfg.size_max = 0;
 516     blkcfg.physical_block_exp = get_physical_block_exp(s->conf);
 517     blkcfg.alignment_offset = 0;
 518     blkcfg.wce = bdrv_enable_write_cache(s->bs);
 519     memcpy(config, &blkcfg, sizeof(struct virtio_blk_config));
 520 }
 521
 522 static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
 523 {
 524     VirtIOBlock *s = to_virtio_blk(vdev);
 525     struct virtio_blk_config blkcfg;
 526
 527     memcpy(&blkcfg, config, sizeof(blkcfg));
 528     bdrv_set_enable_write_cache(s->bs, blkcfg.wce != 0);
 529 }
 530
 531 static uint32_t virtio_blk_get_features(VirtIODevice *vdev, uint32_t features)
 532 {
 533     VirtIOBlock *s = to_virtio_blk(vdev);
 534
 535     features |= (1 << VIRTIO_BLK_F_SEG_MAX);
 536     features |= (1 << VIRTIO_BLK_F_GEOMETRY);
 537     features |= (1 << VIRTIO_BLK_F_TOPOLOGY);
 538     features |= (1 << VIRTIO_BLK_F_BLK_SIZE);
 539     features |= (1 << VIRTIO_BLK_F_SCSI);
 540
 541     if (s->blk.config_wce) {
 542         features |= (1 << VIRTIO_BLK_F_CONFIG_WCE);
 543     }
 544     if (bdrv_enable_write_cache(s->bs))
 545         features |= (1 << VIRTIO_BLK_F_WCE);
 546
 547     if (bdrv_is_read_only(s->bs))
 548         features |= 1 << VIRTIO_BLK_F_RO;
 549
 550     return features;
 551 }
 552
 553 static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
 554 {
 555     VirtIOBlock *s = to_virtio_blk(vdev);
 556     uint32_t features;
 557
 558 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
 559     if (s->dataplane && !(status & (VIRTIO_CONFIG_S_DRIVER |
 560                                     VIRTIO_CONFIG_S_DRIVER_OK))) {
 561         virtio_blk_data_plane_stop(s->dataplane);
 562     }
 563 #endif
 564
 565     if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 566         return;
 567     }
 568
 569     features = vdev->guest_features;
 570     bdrv_set_enable_write_cache(s->bs, !!(features & (1 << VIRTIO_BLK_F_WCE)));
 571 }
 572
 573 static void virtio_blk_save(QEMUFile *f, void *opaque)
 574 {
 575     VirtIOBlock *s = opaque;
 576     VirtIOBlockReq *req = s->rq;
 577
 578     virtio_save(&s->vdev, f);
 579
 580     while (req) {
 581         qemu_put_sbyte(f, 1);
 582         qemu_put_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem));
 583         req = req->next;
 584     }
 585     qemu_put_sbyte(f, 0);
 586 }
 587
 588 static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id)
 589 {
 590     VirtIOBlock *s = opaque;
 591     int ret;
 592
 593     if (version_id != 2)
 594         return -EINVAL;
 595
 596     ret = virtio_load(&s->vdev, f);
 597     if (ret) {
 598         return ret;
 599     }
 600
 601     while (qemu_get_sbyte(f)) {
 602         VirtIOBlockReq *req = virtio_blk_alloc_request(s);
 603         qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem));
 604         req->next = s->rq;
 605         s->rq = req;
 606
 607         virtqueue_map_sg(req->elem.in_sg, req->elem.in_addr,
 608             req->elem.in_num, 1);
 609         virtqueue_map_sg(req->elem.out_sg, req->elem.out_addr,
 610             req->elem.out_num, 0);
 611     }
 612
 613     return 0;
 614 }
 615
 616 static void virtio_blk_resize(void *opaque)
 617 {
 618     VirtIOBlock *s = opaque;
 619
 620     virtio_notify_config(&s->vdev);
 621 }
 622
 623 static const BlockDevOps virtio_block_ops = {
 624     .resize_cb = virtio_blk_resize,
 625 };
 626
 627 void virtio_blk_set_conf(DeviceState *dev, VirtIOBlkConf *blk)
 628 {
 629     VirtIOBlock *s = VIRTIO_BLK(dev);
 630     memcpy(&(s->blk), blk, sizeof(struct VirtIOBlkConf));
 631 }
 632
 633 static VirtIODevice *virtio_blk_common_init(DeviceState *dev,
 634                                           VirtIOBlkConf *blk, VirtIOBlock **ps)
 635 {
 636     VirtIOBlock *s = *ps;
 637     static int virtio_blk_id;
 638
 639     if (!blk->conf.bs) {
 640         error_report("drive property not set");
 641         return NULL;
 642     }
 643     if (!bdrv_is_inserted(blk->conf.bs)) {
 644         error_report("Device needs media, but drive is empty");
 645         return NULL;
 646     }
 647
 648     blkconf_serial(&blk->conf, &blk->serial);
 649     if (blkconf_geometry(&blk->conf, NULL, 65535, 255, 255) < 0) {
 650         return NULL;
 651     }
 652
 653     /*
 654      * We have two cases here: the old virtio-blk-pci device, and the
 655      * refactored virtio-blk.
 656      */
 657     if (s == NULL) {
 658         /* virtio-blk-pci */
 659         s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
 660                                               sizeof(struct virtio_blk_config),
 661                                               sizeof(VirtIOBlock));
 662     } else {
 663         /* virtio-blk */
 664         virtio_init(VIRTIO_DEVICE(s), "virtio-blk", VIRTIO_ID_BLOCK,
 665                     sizeof(struct virtio_blk_config));
 666     }
 667
 668     s->vdev.get_config = virtio_blk_update_config;
 669     s->vdev.set_config = virtio_blk_set_config;
 670     s->vdev.get_features = virtio_blk_get_features;
 671     s->vdev.set_status = virtio_blk_set_status;
 672     s->vdev.reset = virtio_blk_reset;
 673     s->bs = blk->conf.bs;
 674     s->conf = &blk->conf;
 675     memcpy(&(s->blk), blk, sizeof(struct VirtIOBlkConf));
 676     s->rq = NULL;
 677     s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1;
 678
 679     s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
 680 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
 681     if (!virtio_blk_data_plane_create(&s->vdev, blk, &s->dataplane)) {
 682         virtio_cleanup(&s->vdev);
 683         return NULL;
 684     }
 685 #endif
 686
 687     s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
 688     s->qdev = dev;
 689     register_savevm(dev, "virtio-blk", virtio_blk_id++, 2,
 690                     virtio_blk_save, virtio_blk_load, s);
 691     bdrv_set_dev_ops(s->bs, &virtio_block_ops, s);
 692     bdrv_set_buffer_alignment(s->bs, s->conf->logical_block_size);
 693
 694     bdrv_iostatus_enable(s->bs);
 695     add_boot_device_path(s->conf->bootindex, dev, "/disk@0,0");
 696
 697     return &s->vdev;
 698 }
 699
 700 VirtIODevice *virtio_blk_init(DeviceState *dev, VirtIOBlkConf *blk)
 701 {
 702     VirtIOBlock *s = NULL;
 703     return virtio_blk_common_init(dev, blk, &s);
 704 }
 705
 706 void virtio_blk_exit(VirtIODevice *vdev)
 707 {
 708     VirtIOBlock *s = to_virtio_blk(vdev);
 709
 710 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
 711     virtio_blk_data_plane_destroy(s->dataplane);
 712     s->dataplane = NULL;
 713 #endif
 714     qemu_del_vm_change_state_handler(s->change);
 715     unregister_savevm(s->qdev, "virtio-blk", s);
 716     blockdev_mark_auto_del(s->bs);
 717     virtio_cleanup(vdev);
 718 }
 719
 720
 721 static int virtio_blk_device_init(VirtIODevice *vdev)
 722 {
 723     DeviceState *qdev = DEVICE(vdev);
 724     VirtIOBlock *s = VIRTIO_BLK(vdev);
 725     VirtIOBlkConf *blk = &(s->blk);
 726     if (virtio_blk_common_init(qdev, blk, &s) == NULL) {
 727         return -1;
 728     }
 729     return 0;
 730 }
 731
 732 static int virtio_blk_device_exit(DeviceState *dev)
 733 {
 734     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
 735     VirtIOBlock *s = VIRTIO_BLK(dev);
 736 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
 737     virtio_blk_data_plane_destroy(s->dataplane);
 738     s->dataplane = NULL;
 739 #endif
 740     qemu_del_vm_change_state_handler(s->change);
 741     unregister_savevm(s->qdev, "virtio-blk", s);
 742     blockdev_mark_auto_del(s->bs);
 743     virtio_common_cleanup(vdev);
 744     return 0;
 745 }
 746
 747 static Property virtio_blk_properties[] = {
 748     DEFINE_VIRTIO_BLK_PROPERTIES(VirtIOBlock, blk),
 749     DEFINE_PROP_END_OF_LIST(),
 750 };
 751
 752 static void virtio_blk_class_init(ObjectClass *klass, void *data)
 753 {
 754     DeviceClass *dc = DEVICE_CLASS(klass);
 755     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 756     dc->exit = virtio_blk_device_exit;
 757     dc->props = virtio_blk_properties;
 758     vdc->init = virtio_blk_device_init;
 759     vdc->get_config = virtio_blk_update_config;
 760     vdc->set_config = virtio_blk_set_config;
 761     vdc->get_features = virtio_blk_get_features;
 762     vdc->set_status = virtio_blk_set_status;
 763     vdc->reset = virtio_blk_reset;
 764 }
 765
 766 static const TypeInfo virtio_device_info = {
 767     .name = TYPE_VIRTIO_BLK,
 768     .parent = TYPE_VIRTIO_DEVICE,
 769     .instance_size = sizeof(VirtIOBlock),
 770     .class_init = virtio_blk_class_init,
 771 };
 772
 773 static void virtio_register_types(void)
 774 {
 775     type_register_static(&virtio_device_info);
 776 }
 777
 778 type_init(virtio_register_types)