hw/usb/dev-storage.c

   1 /*
   2  * USB Mass Storage Device emulation
   3  *
   4  * Copyright (c) 2006 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licensed under the LGPL.
   8  */
   9
  10 #include "qemu-common.h"
  11 #include "qemu/option.h"
  12 #include "qemu/config-file.h"
  13 #include "hw/usb.h"
  14 #include "hw/usb/desc.h"
  15 #include "hw/scsi.h"
  16 #include "ui/console.h"
  17 #include "monitor/monitor.h"
  18 #include "sysemu/sysemu.h"
  19 #include "sysemu/blockdev.h"
  20
  21 //#define DEBUG_MSD
  22
  23 #ifdef DEBUG_MSD
  24 #define DPRINTF(fmt, ...) \
  25 do { printf("usb-msd: " fmt , ## __VA_ARGS__); } while (0)
  26 #else
  27 #define DPRINTF(fmt, ...) do {} while(0)
  28 #endif
  29
  30 /* USB requests.  */
  31 #define MassStorageReset  0xff
  32 #define GetMaxLun         0xfe
  33
  34 enum USBMSDMode {
  35     USB_MSDM_CBW, /* Command Block.  */
  36     USB_MSDM_DATAOUT, /* Transfer data to device.  */
  37     USB_MSDM_DATAIN, /* Transfer data from device.  */
  38     USB_MSDM_CSW /* Command Status.  */
  39 };
  40
  41 struct usb_msd_csw {
  42     uint32_t sig;
  43     uint32_t tag;
  44     uint32_t residue;
  45     uint8_t status;
  46 };
  47
  48 typedef struct {
  49     USBDevice dev;
  50     enum USBMSDMode mode;
  51     uint32_t scsi_off;
  52     uint32_t scsi_len;
  53     uint32_t data_len;
  54     struct usb_msd_csw csw;
  55     SCSIRequest *req;
  56     SCSIBus bus;
  57     BlockConf conf;
  58     char *serial;
  59     SCSIDevice *scsi_dev;
  60     uint32_t removable;
  61     /* For async completion.  */
  62     USBPacket *packet;
  63 } MSDState;
  64
  65 struct usb_msd_cbw {
  66     uint32_t sig;
  67     uint32_t tag;
  68     uint32_t data_len;
  69     uint8_t flags;
  70     uint8_t lun;
  71     uint8_t cmd_len;
  72     uint8_t cmd[16];
  73 };
  74
  75 enum {
  76     STR_MANUFACTURER = 1,
  77     STR_PRODUCT,
  78     STR_SERIALNUMBER,
  79     STR_CONFIG_FULL,
  80     STR_CONFIG_HIGH,
  81     STR_CONFIG_SUPER,
  82 };
  83
  84 static const USBDescStrings desc_strings = {
  85     [STR_MANUFACTURER] = "QEMU",
  86     [STR_PRODUCT]      = "QEMU USB HARDDRIVE",
  87     [STR_SERIALNUMBER] = "1",
  88     [STR_CONFIG_FULL]  = "Full speed config (usb 1.1)",
  89     [STR_CONFIG_HIGH]  = "High speed config (usb 2.0)",
  90     [STR_CONFIG_SUPER] = "Super speed config (usb 3.0)",
  91 };
  92
  93 static const USBDescIface desc_iface_full = {
  94     .bInterfaceNumber              = 0,
  95     .bNumEndpoints                 = 2,
  96     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
  97     .bInterfaceSubClass            = 0x06, /* SCSI */
  98     .bInterfaceProtocol            = 0x50, /* Bulk */
  99     .eps = (USBDescEndpoint[]) {
 100         {
 101             .bEndpointAddress      = USB_DIR_IN | 0x01,
 102             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 103             .wMaxPacketSize        = 64,
 104         },{
 105             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 106             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 107             .wMaxPacketSize        = 64,
 108         },
 109     }
 110 };
 111
 112 static const USBDescDevice desc_device_full = {
 113     .bcdUSB                        = 0x0200,
 114     .bMaxPacketSize0               = 8,
 115     .bNumConfigurations            = 1,
 116     .confs = (USBDescConfig[]) {
 117         {
 118             .bNumInterfaces        = 1,
 119             .bConfigurationValue   = 1,
 120             .iConfiguration        = STR_CONFIG_FULL,
 121             .bmAttributes          = 0xc0,
 122             .nif = 1,
 123             .ifs = &desc_iface_full,
 124         },
 125     },
 126 };
 127
 128 static const USBDescIface desc_iface_high = {
 129     .bInterfaceNumber              = 0,
 130     .bNumEndpoints                 = 2,
 131     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
 132     .bInterfaceSubClass            = 0x06, /* SCSI */
 133     .bInterfaceProtocol            = 0x50, /* Bulk */
 134     .eps = (USBDescEndpoint[]) {
 135         {
 136             .bEndpointAddress      = USB_DIR_IN | 0x01,
 137             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 138             .wMaxPacketSize        = 512,
 139         },{
 140             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 141             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 142             .wMaxPacketSize        = 512,
 143         },
 144     }
 145 };
 146
 147 static const USBDescDevice desc_device_high = {
 148     .bcdUSB                        = 0x0200,
 149     .bMaxPacketSize0               = 64,
 150     .bNumConfigurations            = 1,
 151     .confs = (USBDescConfig[]) {
 152         {
 153             .bNumInterfaces        = 1,
 154             .bConfigurationValue   = 1,
 155             .iConfiguration        = STR_CONFIG_HIGH,
 156             .bmAttributes          = 0xc0,
 157             .nif = 1,
 158             .ifs = &desc_iface_high,
 159         },
 160     },
 161 };
 162
 163 static const USBDescIface desc_iface_super = {
 164     .bInterfaceNumber              = 0,
 165     .bNumEndpoints                 = 2,
 166     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
 167     .bInterfaceSubClass            = 0x06, /* SCSI */
 168     .bInterfaceProtocol            = 0x50, /* Bulk */
 169     .eps = (USBDescEndpoint[]) {
 170         {
 171             .bEndpointAddress      = USB_DIR_IN | 0x01,
 172             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 173             .wMaxPacketSize        = 1024,
 174             .bMaxBurst             = 15,
 175         },{
 176             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 177             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 178             .wMaxPacketSize        = 1024,
 179             .bMaxBurst             = 15,
 180         },
 181     }
 182 };
 183
 184 static const USBDescDevice desc_device_super = {
 185     .bcdUSB                        = 0x0300,
 186     .bMaxPacketSize0               = 9,
 187     .bNumConfigurations            = 1,
 188     .confs = (USBDescConfig[]) {
 189         {
 190             .bNumInterfaces        = 1,
 191             .bConfigurationValue   = 1,
 192             .iConfiguration        = STR_CONFIG_SUPER,
 193             .bmAttributes          = 0xc0,
 194             .nif = 1,
 195             .ifs = &desc_iface_super,
 196         },
 197     },
 198 };
 199
 200 static const USBDesc desc = {
 201     .id = {
 202         .idVendor          = 0x46f4, /* CRC16() of "QEMU" */
 203         .idProduct         = 0x0001,
 204         .bcdDevice         = 0,
 205         .iManufacturer     = STR_MANUFACTURER,
 206         .iProduct          = STR_PRODUCT,
 207         .iSerialNumber     = STR_SERIALNUMBER,
 208     },
 209     .full  = &desc_device_full,
 210     .high  = &desc_device_high,
 211     .super = &desc_device_super,
 212     .str   = desc_strings,
 213 };
 214
 215 static void usb_msd_copy_data(MSDState *s, USBPacket *p)
 216 {
 217     uint32_t len;
 218     len = p->iov.size - p->actual_length;
 219     if (len > s->scsi_len)
 220         len = s->scsi_len;
 221     usb_packet_copy(p, scsi_req_get_buf(s->req) + s->scsi_off, len);
 222     s->scsi_len -= len;
 223     s->scsi_off += len;
 224     s->data_len -= len;
 225     if (s->scsi_len == 0 || s->data_len == 0) {
 226         scsi_req_continue(s->req);
 227     }
 228 }
 229
 230 static void usb_msd_send_status(MSDState *s, USBPacket *p)
 231 {
 232     int len;
 233
 234     DPRINTF("Command status %d tag 0x%x, len %zd\n",
 235             s->csw.status, le32_to_cpu(s->csw.tag), p->iov.size);
 236
 237     assert(s->csw.sig == cpu_to_le32(0x53425355));
 238     len = MIN(sizeof(s->csw), p->iov.size);
 239     usb_packet_copy(p, &s->csw, len);
 240     memset(&s->csw, 0, sizeof(s->csw));
 241 }
 242
 243 static void usb_msd_packet_complete(MSDState *s)
 244 {
 245     USBPacket *p = s->packet;
 246
 247     /* Set s->packet to NULL before calling usb_packet_complete
 248        because another request may be issued before
 249        usb_packet_complete returns.  */
 250     DPRINTF("Packet complete %p\n", p);
 251     s->packet = NULL;
 252     usb_packet_complete(&s->dev, p);
 253 }
 254
 255 static void usb_msd_transfer_data(SCSIRequest *req, uint32_t len)
 256 {
 257     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 258     USBPacket *p = s->packet;
 259
 260     assert((s->mode == USB_MSDM_DATAOUT) == (req->cmd.mode == SCSI_XFER_TO_DEV));
 261     s->scsi_len = len;
 262     s->scsi_off = 0;
 263     if (p) {
 264         usb_msd_copy_data(s, p);
 265         p = s->packet;
 266         if (p && p->actual_length == p->iov.size) {
 267             p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
 268             usb_msd_packet_complete(s);
 269         }
 270     }
 271 }
 272
 273 static void usb_msd_command_complete(SCSIRequest *req, uint32_t status, size_t resid)
 274 {
 275     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 276     USBPacket *p = s->packet;
 277
 278     DPRINTF("Command complete %d tag 0x%x\n", status, req->tag);
 279
 280     s->csw.sig = cpu_to_le32(0x53425355);
 281     s->csw.tag = cpu_to_le32(req->tag);
 282     s->csw.residue = cpu_to_le32(s->data_len);
 283     s->csw.status = status != 0;
 284
 285     if (s->packet) {
 286         if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
 287             /* A deferred packet with no write data remaining must be
 288                the status read packet.  */
 289             usb_msd_send_status(s, p);
 290             s->mode = USB_MSDM_CBW;
 291         } else if (s->mode == USB_MSDM_CSW) {
 292             usb_msd_send_status(s, p);
 293             s->mode = USB_MSDM_CBW;
 294         } else {
 295             if (s->data_len) {
 296                 int len = (p->iov.size - p->actual_length);
 297                 usb_packet_skip(p, len);
 298                 s->data_len -= len;
 299             }
 300             if (s->data_len == 0) {
 301                 s->mode = USB_MSDM_CSW;
 302             }
 303         }
 304         p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
 305         usb_msd_packet_complete(s);
 306     } else if (s->data_len == 0) {
 307         s->mode = USB_MSDM_CSW;
 308     }
 309     scsi_req_unref(req);
 310     s->req = NULL;
 311 }
 312
 313 static void usb_msd_request_cancelled(SCSIRequest *req)
 314 {
 315     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 316
 317     if (req == s->req) {
 318         scsi_req_unref(s->req);
 319         s->req = NULL;
 320         s->scsi_len = 0;
 321     }
 322 }
 323
 324 static void usb_msd_handle_reset(USBDevice *dev)
 325 {
 326     MSDState *s = (MSDState *)dev;
 327
 328     DPRINTF("Reset\n");
 329     if (s->req) {
 330         scsi_req_cancel(s->req);
 331     }
 332     assert(s->req == NULL);
 333
 334     if (s->packet) {
 335         s->packet->status = USB_RET_STALL;
 336         usb_msd_packet_complete(s);
 337     }
 338
 339     s->mode = USB_MSDM_CBW;
 340 }
 341
 342 static void usb_msd_handle_control(USBDevice *dev, USBPacket *p,
 343                int request, int value, int index, int length, uint8_t *data)
 344 {
 345     MSDState *s = (MSDState *)dev;
 346     int ret;
 347
 348     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 349     if (ret >= 0) {
 350         return;
 351     }
 352
 353     switch (request) {
 354     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 355         break;
 356         /* Class specific requests.  */
 357     case ClassInterfaceOutRequest | MassStorageReset:
 358         /* Reset state ready for the next CBW.  */
 359         s->mode = USB_MSDM_CBW;
 360         break;
 361     case ClassInterfaceRequest | GetMaxLun:
 362         data[0] = 0;
 363         p->actual_length = 1;
 364         break;
 365     default:
 366         p->status = USB_RET_STALL;
 367         break;
 368     }
 369 }
 370
 371 static void usb_msd_cancel_io(USBDevice *dev, USBPacket *p)
 372 {
 373     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 374
 375     assert(s->packet == p);
 376     s->packet = NULL;
 377
 378     if (s->req) {
 379         scsi_req_cancel(s->req);
 380     }
 381 }
 382
 383 static void usb_msd_handle_data(USBDevice *dev, USBPacket *p)
 384 {
 385     MSDState *s = (MSDState *)dev;
 386     uint32_t tag;
 387     struct usb_msd_cbw cbw;
 388     uint8_t devep = p->ep->nr;
 389
 390     switch (p->pid) {
 391     case USB_TOKEN_OUT:
 392         if (devep != 2)
 393             goto fail;
 394
 395         switch (s->mode) {
 396         case USB_MSDM_CBW:
 397             if (p->iov.size != 31) {
 398                 fprintf(stderr, "usb-msd: Bad CBW size");
 399                 goto fail;
 400             }
 401             usb_packet_copy(p, &cbw, 31);
 402             if (le32_to_cpu(cbw.sig) != 0x43425355) {
 403                 fprintf(stderr, "usb-msd: Bad signature %08x\n",
 404                         le32_to_cpu(cbw.sig));
 405                 goto fail;
 406             }
 407             DPRINTF("Command on LUN %d\n", cbw.lun);
 408             if (cbw.lun != 0) {
 409                 fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
 410                 goto fail;
 411             }
 412             tag = le32_to_cpu(cbw.tag);
 413             s->data_len = le32_to_cpu(cbw.data_len);
 414             if (s->data_len == 0) {
 415                 s->mode = USB_MSDM_CSW;
 416             } else if (cbw.flags & 0x80) {
 417                 s->mode = USB_MSDM_DATAIN;
 418             } else {
 419                 s->mode = USB_MSDM_DATAOUT;
 420             }
 421             DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
 422                     tag, cbw.flags, cbw.cmd_len, s->data_len);
 423             assert(le32_to_cpu(s->csw.residue) == 0);
 424             s->scsi_len = 0;
 425             s->req = scsi_req_new(s->scsi_dev, tag, 0, cbw.cmd, NULL);
 426 #ifdef DEBUG_MSD
 427             scsi_req_print(s->req);
 428 #endif
 429             scsi_req_enqueue(s->req);
 430             if (s->req->cmd.xfer != SCSI_XFER_NONE) {
 431                 scsi_req_continue(s->req);
 432             }
 433             break;
 434
 435         case USB_MSDM_DATAOUT:
 436             DPRINTF("Data out %zd/%d\n", p->iov.size, s->data_len);
 437             if (p->iov.size > s->data_len) {
 438                 goto fail;
 439             }
 440
 441             if (s->scsi_len) {
 442                 usb_msd_copy_data(s, p);
 443             }
 444             if (le32_to_cpu(s->csw.residue)) {
 445                 int len = p->iov.size - p->actual_length;
 446                 if (len) {
 447                     usb_packet_skip(p, len);
 448                     s->data_len -= len;
 449                     if (s->data_len == 0) {
 450                         s->mode = USB_MSDM_CSW;
 451                     }
 452                 }
 453             }
 454             if (p->actual_length < p->iov.size) {
 455                 DPRINTF("Deferring packet %p [wait data-out]\n", p);
 456                 s->packet = p;
 457                 p->status = USB_RET_ASYNC;
 458             }
 459             break;
 460
 461         default:
 462             DPRINTF("Unexpected write (len %zd)\n", p->iov.size);
 463             goto fail;
 464         }
 465         break;
 466
 467     case USB_TOKEN_IN:
 468         if (devep != 1)
 469             goto fail;
 470
 471         switch (s->mode) {
 472         case USB_MSDM_DATAOUT:
 473             if (s->data_len != 0 || p->iov.size < 13) {
 474                 goto fail;
 475             }
 476             /* Waiting for SCSI write to complete.  */
 477             s->packet = p;
 478             p->status = USB_RET_ASYNC;
 479             break;
 480
 481         case USB_MSDM_CSW:
 482             if (p->iov.size < 13) {
 483                 goto fail;
 484             }
 485
 486             if (s->req) {
 487                 /* still in flight */
 488                 DPRINTF("Deferring packet %p [wait status]\n", p);
 489                 s->packet = p;
 490                 p->status = USB_RET_ASYNC;
 491             } else {
 492                 usb_msd_send_status(s, p);
 493                 s->mode = USB_MSDM_CBW;
 494             }
 495             break;
 496
 497         case USB_MSDM_DATAIN:
 498             DPRINTF("Data in %zd/%d, scsi_len %d\n",
 499                     p->iov.size, s->data_len, s->scsi_len);
 500             if (s->scsi_len) {
 501                 usb_msd_copy_data(s, p);
 502             }
 503             if (le32_to_cpu(s->csw.residue)) {
 504                 int len = p->iov.size - p->actual_length;
 505                 if (len) {
 506                     usb_packet_skip(p, len);
 507                     s->data_len -= len;
 508                     if (s->data_len == 0) {
 509                         s->mode = USB_MSDM_CSW;
 510                     }
 511                 }
 512             }
 513             if (p->actual_length < p->iov.size) {
 514                 DPRINTF("Deferring packet %p [wait data-in]\n", p);
 515                 s->packet = p;
 516                 p->status = USB_RET_ASYNC;
 517             }
 518             break;
 519
 520         default:
 521             DPRINTF("Unexpected read (len %zd)\n", p->iov.size);
 522             goto fail;
 523         }
 524         break;
 525
 526     default:
 527         DPRINTF("Bad token\n");
 528     fail:
 529         p->status = USB_RET_STALL;
 530         break;
 531     }
 532 }
 533
 534 static void usb_msd_password_cb(void *opaque, int err)
 535 {
 536     MSDState *s = opaque;
 537
 538     if (!err)
 539         err = usb_device_attach(&s->dev);
 540
 541     if (err)
 542         qdev_unplug(&s->dev.qdev, NULL);
 543 }
 544
 545 static void *usb_msd_load_request(QEMUFile *f, SCSIRequest *req)
 546 {
 547     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 548
 549     /* nothing to load, just store req in our state struct */
 550     assert(s->req == NULL);
 551     scsi_req_ref(req);
 552     s->req = req;
 553     return NULL;
 554 }
 555
 556 static const struct SCSIBusInfo usb_msd_scsi_info = {
 557     .tcq = false,
 558     .max_target = 0,
 559     .max_lun = 0,
 560
 561     .transfer_data = usb_msd_transfer_data,
 562     .complete = usb_msd_command_complete,
 563     .cancel = usb_msd_request_cancelled,
 564     .load_request = usb_msd_load_request,
 565 };
 566
 567 static int usb_msd_initfn(USBDevice *dev)
 568 {
 569     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 570     BlockDriverState *bs = s->conf.bs;
 571
 572     if (!bs) {
 573         error_report("drive property not set");
 574         return -1;
 575     }
 576
 577     blkconf_serial(&s->conf, &s->serial);
 578
 579     /*
 580      * Hack alert: this pretends to be a block device, but it's really
 581      * a SCSI bus that can serve only a single device, which it
 582      * creates automatically.  But first it needs to detach from its
 583      * blockdev, or else scsi_bus_legacy_add_drive() dies when it
 584      * attaches again.
 585      *
 586      * The hack is probably a bad idea.
 587      */
 588     bdrv_detach_dev(bs, &s->dev.qdev);
 589     s->conf.bs = NULL;
 590
 591     if (s->serial) {
 592         usb_desc_set_string(dev, STR_SERIALNUMBER, s->serial);
 593     } else {
 594         usb_desc_create_serial(dev);
 595     }
 596
 597     usb_desc_init(dev);
 598     scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info);
 599     s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable,
 600                                             s->conf.bootindex);
 601     if (!s->scsi_dev) {
 602         return -1;
 603     }
 604     s->bus.qbus.allow_hotplug = 0;
 605     usb_msd_handle_reset(dev);
 606
 607     if (bdrv_key_required(bs)) {
 608         if (cur_mon) {
 609             monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s);
 610             s->dev.auto_attach = 0;
 611         } else {
 612             autostart = 0;
 613         }
 614     }
 615
 616     return 0;
 617 }
 618
 619 static USBDevice *usb_msd_init(USBBus *bus, const char *filename)
 620 {
 621     static int nr=0;
 622     char id[8];
 623     QemuOpts *opts;
 624     DriveInfo *dinfo;
 625     USBDevice *dev;
 626     const char *p1;
 627     char fmt[32];
 628
 629     /* parse -usbdevice disk: syntax into drive opts */
 630     snprintf(id, sizeof(id), "usb%d", nr++);
 631     opts = qemu_opts_create(qemu_find_opts("drive"), id, 0, NULL);
 632
 633     p1 = strchr(filename, ':');
 634     if (p1++) {
 635         const char *p2;
 636
 637         if (strstart(filename, "format=", &p2)) {
 638             int len = MIN(p1 - p2, sizeof(fmt));
 639             pstrcpy(fmt, len, p2);
 640             qemu_opt_set(opts, "format", fmt);
 641         } else if (*filename != ':') {
 642             printf("unrecognized USB mass-storage option %s\n", filename);
 643             return NULL;
 644         }
 645         filename = p1;
 646     }
 647     if (!*filename) {
 648         printf("block device specification needed\n");
 649         return NULL;
 650     }
 651     qemu_opt_set(opts, "file", filename);
 652     qemu_opt_set(opts, "if", "none");
 653
 654     /* create host drive */
 655     dinfo = drive_init(opts, 0);
 656     if (!dinfo) {
 657         qemu_opts_del(opts);
 658         return NULL;
 659     }
 660
 661     /* create guest device */
 662     dev = usb_create(bus, "usb-storage");
 663     if (!dev) {
 664         return NULL;
 665     }
 666     if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 667         qdev_free(&dev->qdev);
 668         return NULL;
 669     }
 670     if (qdev_init(&dev->qdev) < 0)
 671         return NULL;
 672
 673     return dev;
 674 }
 675
 676 static const VMStateDescription vmstate_usb_msd = {
 677     .name = "usb-storage",
 678     .version_id = 1,
 679     .minimum_version_id = 1,
 680     .fields = (VMStateField []) {
 681         VMSTATE_USB_DEVICE(dev, MSDState),
 682         VMSTATE_UINT32(mode, MSDState),
 683         VMSTATE_UINT32(scsi_len, MSDState),
 684         VMSTATE_UINT32(scsi_off, MSDState),
 685         VMSTATE_UINT32(data_len, MSDState),
 686         VMSTATE_UINT32(csw.sig, MSDState),
 687         VMSTATE_UINT32(csw.tag, MSDState),
 688         VMSTATE_UINT32(csw.residue, MSDState),
 689         VMSTATE_UINT8(csw.status, MSDState),
 690         VMSTATE_END_OF_LIST()
 691     }
 692 };
 693
 694 static Property msd_properties[] = {
 695     DEFINE_BLOCK_PROPERTIES(MSDState, conf),
 696     DEFINE_PROP_STRING("serial", MSDState, serial),
 697     DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
 698     DEFINE_PROP_END_OF_LIST(),
 699 };
 700
 701 static void usb_msd_class_initfn(ObjectClass *klass, void *data)
 702 {
 703     DeviceClass *dc = DEVICE_CLASS(klass);
 704     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 705
 706     uc->init           = usb_msd_initfn;
 707     uc->product_desc   = "QEMU USB MSD";
 708     uc->usb_desc       = &desc;
 709     uc->cancel_packet  = usb_msd_cancel_io;
 710     uc->handle_attach  = usb_desc_attach;
 711     uc->handle_reset   = usb_msd_handle_reset;
 712     uc->handle_control = usb_msd_handle_control;
 713     uc->handle_data    = usb_msd_handle_data;
 714     dc->fw_name = "storage";
 715     dc->vmsd = &vmstate_usb_msd;
 716     dc->props = msd_properties;
 717 }
 718
 719 static const TypeInfo msd_info = {
 720     .name          = "usb-storage",
 721     .parent        = TYPE_USB_DEVICE,
 722     .instance_size = sizeof(MSDState),
 723     .class_init    = usb_msd_class_initfn,
 724 };
 725
 726 static void usb_msd_register_types(void)
 727 {
 728     type_register_static(&msd_info);
 729     usb_legacy_register("usb-storage", "disk", usb_msd_init);
 730 }
 731
 732 type_init(usb_msd_register_types)