palacios/src/devices/lnx_virtio_blk.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
  15  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20 #include <palacios/vmm.h>
  21 #include <palacios/vmm_dev_mgr.h>
  22 #include <devices/lnx_virtio_pci.h>
  23 #include <palacios/vm_guest_mem.h>
  24
  25 #include <devices/pci.h>
  26
  27
  28
  29 #ifndef V3_CONFIG_DEBUG_VIRTIO_BLK
  30 #undef PrintDebug
  31 #define PrintDebug(fmt, args...)
  32 #endif
  33
  34
  35 #define SECTOR_SIZE 512
  36
  37 #define BLK_CAPACITY_PORT     20
  38 #define BLK_MAX_SIZE_PORT     28
  39 #define BLK_MAX_SEG_PORT      32
  40 #define BLK_CYLINDERS_PORT    36
  41 #define BLK_HEADS_PORT        38
  42 #define BLK_SECTS_PORT        39
  43
  44 #define BLK_IN_REQ            0
  45 #define BLK_OUT_REQ           1
  46 #define BLK_SCSI_CMD          2
  47
  48 #define BLK_BARRIER_FLAG     0x80000000
  49
  50 #define BLK_STATUS_OK             0
  51 #define BLK_STATUS_ERR            1
  52 #define BLK_STATUS_NOT_SUPPORTED  2
  53
  54
  55 struct blk_config {
  56     uint64_t capacity;
  57     uint32_t max_size;
  58     uint32_t max_seg;
  59     uint16_t cylinders;
  60     uint8_t heads;
  61     uint8_t sectors;
  62     /*
  63     uint32_t blk_size;
  64     uint8_t phys_block_exp;
  65     uint8_t alignment_offset;
  66     uint16_t min_io_size;
  67     uint32_t opt_io_size;
  68     */
  69 } __attribute__((packed));
  70
  71
  72
  73 struct blk_op_hdr {
  74     uint32_t type;
  75     uint32_t prior;
  76     uint64_t sector;
  77 } __attribute__((packed));
  78
  79 #define QUEUE_SIZE 128
  80
  81 /* Host Feature flags */
  82 #define VIRTIO_BARRIER       0x01       /* Does host support barriers? */
  83 #define VIRTIO_SIZE_MAX      0x02       /* Indicates maximum segment size */
  84 #define VIRTIO_SEG_MAX       0x04       /* Indicates maximum # of segments */
  85 #define VIRTIO_LEGACY_GEOM   0x10       /* Indicates support of legacy geometry */
  86
  87
  88 struct virtio_dev_state {
  89     struct vm_device * pci_bus;
  90     struct list_head dev_list;
  91 };
  92
  93 struct virtio_blk_state {
  94
  95     struct pci_device * pci_dev;
  96     struct blk_config block_cfg;
  97     struct virtio_config virtio_cfg;
  98
  99
 100     struct virtio_queue queue;
 101
 102     struct v3_dev_blk_ops * ops;
 103
 104     void * backend_data;
 105
 106     int io_range_size;
 107
 108     struct virtio_dev_state * virtio_dev;
 109
 110     struct list_head dev_link;
 111 };
 112
 113
 114
 115
 116 static int blk_reset(struct virtio_blk_state * virtio) {
 117
 118     virtio->queue.ring_desc_addr = 0;
 119     virtio->queue.ring_avail_addr = 0;
 120     virtio->queue.ring_used_addr = 0;
 121     virtio->queue.pfn = 0;
 122     virtio->queue.cur_avail_idx = 0;
 123
 124     virtio->virtio_cfg.status = 0;
 125     virtio->virtio_cfg.pci_isr = 0;
 126     return 0;
 127 }
 128
 129
 130
 131
 132 static int handle_read_op(struct virtio_blk_state * blk_state, uint8_t * buf, uint64_t * sector, uint64_t len) {
 133     int ret = -1;
 134
 135     PrintDebug(info->vm_info, info, "Reading Disk\n");
 136     ret = blk_state->ops->read(buf, (*sector) * SECTOR_SIZE, len, (void *)(blk_state->backend_data));
 137     *sector += (len / SECTOR_SIZE);
 138
 139     return ret;
 140 }
 141
 142
 143 static int handle_write_op(struct virtio_blk_state * blk_state, uint8_t * buf, uint64_t * sector, uint64_t len) {
 144     int ret = -1;
 145
 146     PrintDebug(info->vm_info, info, "Writing Disk\n");
 147     ret = blk_state->ops->write(buf, (*sector) * SECTOR_SIZE, len, (void *)(blk_state->backend_data));
 148     *sector += (len / SECTOR_SIZE);
 149
 150     return ret;
 151 }
 152
 153
 154
 155 // multiple block operations need to increment the sector
 156
 157 static int handle_block_op(struct guest_info * core, struct virtio_blk_state * blk_state, struct blk_op_hdr * hdr,
 158                            struct vring_desc * buf_desc, uint8_t * status) {
 159     uint8_t * buf = NULL;
 160
 161     PrintDebug(core->vm_info, core, "Handling Block op\n");
 162     if (v3_gpa_to_hva(core, buf_desc->addr_gpa, (addr_t *)&(buf)) == -1) {
 163         PrintError(core->vm_info, core, "Could not translate buffer address\n");
 164         return -1;
 165     }
 166
 167     PrintDebug(core->vm_info, core, "Sector=%p Length=%d\n", (void *)(addr_t)(hdr->sector), buf_desc->length);
 168
 169     if (hdr->type == BLK_IN_REQ) {
 170         if (handle_read_op(blk_state, buf, &(hdr->sector), buf_desc->length) == -1) {
 171             *status = BLK_STATUS_ERR;
 172             return -1;
 173         } else {
 174             *status = BLK_STATUS_OK;
 175         }
 176     } else if (hdr->type == BLK_OUT_REQ) {
 177         if (handle_write_op(blk_state, buf, &(hdr->sector), buf_desc->length) == -1) {
 178             *status = BLK_STATUS_ERR;
 179             return -1;
 180         } else {
 181             *status = BLK_STATUS_OK;
 182         }
 183     } else if (hdr->type == BLK_SCSI_CMD) {
 184         PrintError(core->vm_info, core, "VIRTIO: SCSI Command Not supported!!!\n");
 185         *status = BLK_STATUS_NOT_SUPPORTED;
 186         return -1;
 187     }
 188
 189     PrintDebug(core->vm_info, core, "Returning Status: %d\n", *status);
 190
 191     return 0;
 192 }
 193
 194 static int get_desc_count(struct virtio_queue * q, int index) {
 195     struct vring_desc * tmp_desc = &(q->desc[index]);
 196     int cnt = 1;
 197
 198     while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
 199         tmp_desc = &(q->desc[tmp_desc->next]);
 200         cnt++;
 201     }
 202
 203     return cnt;
 204 }
 205
 206
 207
 208 static int handle_kick(struct guest_info * core, struct virtio_blk_state * blk_state) {
 209     struct virtio_queue * q = &(blk_state->queue);
 210
 211     PrintDebug(core->vm_info, core, "VIRTIO KICK: cur_index=%d (mod=%d), avail_index=%d\n",
 212                q->cur_avail_idx, q->cur_avail_idx % QUEUE_SIZE, q->avail->index);
 213
 214     while (q->cur_avail_idx != q->avail->index) {
 215         struct vring_desc * hdr_desc = NULL;
 216         struct vring_desc * buf_desc = NULL;
 217         struct vring_desc * status_desc = NULL;
 218         struct blk_op_hdr hdr;
 219         addr_t hdr_addr = 0;
 220         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 221         int desc_cnt = get_desc_count(q, desc_idx);
 222         int i = 0;
 223         uint8_t * status_ptr = NULL;
 224         uint8_t status = BLK_STATUS_OK;
 225         uint32_t req_len = 0;
 226
 227         PrintDebug(core->vm_info, core, "Descriptor Count=%d, index=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE);
 228
 229         if (desc_cnt < 3) {
 230             PrintError(core->vm_info, core, "Block operations must include at least 3 descriptors\n");
 231             return -1;
 232         }
 233
 234         hdr_desc = &(q->desc[desc_idx]);
 235
 236
 237         PrintDebug(core->vm_info, core, "Header Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", hdr_desc,
 238                    (void *)(hdr_desc->addr_gpa), hdr_desc->length, hdr_desc->flags, hdr_desc->next);
 239
 240         if (v3_gpa_to_hva(core, hdr_desc->addr_gpa, &(hdr_addr)) == -1) {
 241             PrintError(core->vm_info, core, "Could not translate block header address\n");
 242             return -1;
 243         }
 244
 245         // We copy the block op header out because we are going to modify its contents
 246         memcpy(&hdr, (void *)hdr_addr, sizeof(struct blk_op_hdr));
 247
 248         PrintDebug(core->vm_info, core, "Blk Op Hdr (ptr=%p) type=%d, sector=%p\n", (void *)hdr_addr, hdr.type, (void *)hdr.sector);
 249
 250         desc_idx = hdr_desc->next;
 251
 252         for (i = 0; i < desc_cnt - 2; i++) {
 253             uint8_t tmp_status = BLK_STATUS_OK;
 254
 255             buf_desc = &(q->desc[desc_idx]);
 256
 257             PrintDebug(core->vm_info, core, "Buffer Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", buf_desc,
 258                        (void *)(buf_desc->addr_gpa), buf_desc->length, buf_desc->flags, buf_desc->next);
 259
 260             if (handle_block_op(core, blk_state, &hdr, buf_desc, &tmp_status) == -1) {
 261                 PrintError(core->vm_info, core, "Error handling block operation\n");
 262                 return -1;
 263             }
 264
 265             if (tmp_status != BLK_STATUS_OK) {
 266                 status = tmp_status;
 267             }
 268
 269             req_len += buf_desc->length;
 270             desc_idx = buf_desc->next;
 271         }
 272
 273         status_desc = &(q->desc[desc_idx]);
 274
 275         PrintDebug(core->vm_info, core, "Status Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", status_desc,
 276                    (void *)(status_desc->addr_gpa), status_desc->length, status_desc->flags, status_desc->next);
 277
 278         if (v3_gpa_to_hva(core, status_desc->addr_gpa, (addr_t *)&(status_ptr)) == -1) {
 279             PrintError(core->vm_info, core, "Could not translate status address\n");
 280             return -1;
 281         }
 282
 283         req_len += status_desc->length;
 284         *status_ptr = status;
 285
 286         q->used->ring[q->used->index % QUEUE_SIZE].id = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 287         q->used->ring[q->used->index % QUEUE_SIZE].length = req_len; // What do we set this to????
 288
 289         q->used->index++;
 290         q->cur_avail_idx++;
 291     }
 292
 293     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 294         PrintDebug(core->vm_info, core, "Raising IRQ %d\n",  blk_state->pci_dev->config_header.intr_line);
 295         v3_pci_raise_irq(blk_state->virtio_dev->pci_bus, blk_state->pci_dev, 0);
 296         blk_state->virtio_cfg.pci_isr = 1;
 297     }
 298
 299     return 0;
 300 }
 301
 302 static int virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
 303     struct virtio_blk_state * blk_state = (struct virtio_blk_state *)private_data;
 304     int port_idx = port % blk_state->io_range_size;
 305
 306
 307     PrintDebug(core->vm_info, core, "VIRTIO BLOCK Write for port %d (index=%d) len=%d, value=%x\n",
 308                port, port_idx,  length, *(uint32_t *)src);
 309
 310
 311
 312     switch (port_idx) {
 313         case GUEST_FEATURES_PORT:
 314             if (length != 4) {
 315                 PrintError(core->vm_info, core, "Illegal write length for guest features\n");
 316                 return -1;
 317             }
 318
 319             blk_state->virtio_cfg.guest_features = *(uint32_t *)src;
 320             PrintDebug(core->vm_info, core, "Setting Guest Features to %x\n", blk_state->virtio_cfg.guest_features);
 321
 322             break;
 323         case VRING_PG_NUM_PORT:
 324             if (length == 4) {
 325                 addr_t pfn = *(uint32_t *)src;
 326                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 327
 328
 329                 blk_state->queue.pfn = pfn;
 330
 331                 blk_state->queue.ring_desc_addr = page_addr ;
 332                 blk_state->queue.ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 333                 blk_state->queue.ring_used_addr = ( blk_state->queue.ring_avail_addr + \
 334                                                  sizeof(struct vring_avail)    + \
 335                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 336
 337                 // round up to next page boundary.
 338                 blk_state->queue.ring_used_addr = (blk_state->queue.ring_used_addr + 0xfff) & ~0xfff;
 339
 340                 if (v3_gpa_to_hva(core, blk_state->queue.ring_desc_addr, (addr_t *)&(blk_state->queue.desc)) == -1) {
 341                     PrintError(core->vm_info, core, "Could not translate ring descriptor address\n");
 342                     return -1;
 343                 }
 344
 345
 346                 if (v3_gpa_to_hva(core, blk_state->queue.ring_avail_addr, (addr_t *)&(blk_state->queue.avail)) == -1) {
 347                     PrintError(core->vm_info, core, "Could not translate ring available address\n");
 348                     return -1;
 349                 }
 350
 351
 352                 if (v3_gpa_to_hva(core, blk_state->queue.ring_used_addr, (addr_t *)&(blk_state->queue.used)) == -1) {
 353                     PrintError(core->vm_info, core, "Could not translate ring used address\n");
 354                     return -1;
 355                 }
 356
 357                 PrintDebug(core->vm_info, core, "RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 358                            (void *)(blk_state->queue.ring_desc_addr),
 359                            (void *)(blk_state->queue.ring_avail_addr),
 360                            (void *)(blk_state->queue.ring_used_addr));
 361
 362                 PrintDebug(core->vm_info, core, "RingDesc=%p, Avail=%p, Used=%p\n",
 363                            blk_state->queue.desc, blk_state->queue.avail, blk_state->queue.used);
 364
 365             } else {
 366                 PrintError(core->vm_info, core, "Illegal write length for page frame number\n");
 367                 return -1;
 368             }
 369             break;
 370         case VRING_Q_SEL_PORT:
 371             blk_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 372
 373             if (blk_state->virtio_cfg.vring_queue_selector != 0) {
 374                 PrintError(core->vm_info, core, "Virtio Block device only uses 1 queue, selected %d\n",
 375                            blk_state->virtio_cfg.vring_queue_selector);
 376                 return -1;
 377             }
 378
 379             break;
 380         case VRING_Q_NOTIFY_PORT:
 381             PrintDebug(core->vm_info, core, "Handling Kick\n");
 382             if (handle_kick(core, blk_state) == -1) {
 383                 PrintError(core->vm_info, core, "Could not handle Block Notification\n");
 384                 return -1;
 385             }
 386             break;
 387         case VIRTIO_STATUS_PORT:
 388             blk_state->virtio_cfg.status = *(uint8_t *)src;
 389
 390             if (blk_state->virtio_cfg.status == 0) {
 391                 PrintDebug(core->vm_info, core, "Resetting device\n");
 392                 blk_reset(blk_state);
 393             }
 394
 395             break;
 396
 397         case VIRTIO_ISR_PORT:
 398             blk_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 399             break;
 400         default:
 401             return -1;
 402             break;
 403     }
 404
 405     return length;
 406 }
 407
 408
 409 static int virtio_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
 410     struct virtio_blk_state * blk_state = (struct virtio_blk_state *)private_data;
 411     int port_idx = port % blk_state->io_range_size;
 412
 413
 414     PrintDebug(core->vm_info, core, "VIRTIO BLOCK Read  for port %d (index =%d), length=%d\n",
 415                port, port_idx, length);
 416
 417
 418     switch (port_idx) {
 419         case HOST_FEATURES_PORT:
 420         case HOST_FEATURES_PORT + 1:
 421         case HOST_FEATURES_PORT + 2:
 422         case HOST_FEATURES_PORT + 3:
 423             if (port_idx + length > HOST_FEATURES_PORT + 4) {
 424                 PrintError(core->vm_info, core, "Illegal read length for host features (len=%d)\n", length);
 425                 return -1;
 426             }
 427
 428             memcpy(dst, &(blk_state->virtio_cfg.host_features), length);
 429             break;
 430         case VRING_PG_NUM_PORT:
 431         case VRING_PG_NUM_PORT + 1:
 432         case VRING_PG_NUM_PORT + 2:
 433         case VRING_PG_NUM_PORT + 3:
 434             if (port_idx + length > VRING_PG_NUM_PORT + 4) {
 435                 PrintError(core->vm_info, core, "Illegal read length for vring pg num (len=%d)\n", length);
 436                 return -1;
 437             }
 438
 439             memcpy(dst, &(blk_state->queue.pfn), length);
 440             break;
 441         case VRING_SIZE_PORT:
 442         case VRING_SIZE_PORT + 1:
 443             if (length > 2) {
 444                 PrintError(core->vm_info, core, "Illegal read length for vring size (len=%d)\n", length);
 445                 return -1;
 446             }
 447
 448             memcpy(dst, &(blk_state->queue.queue_size), length);
 449
 450             break;
 451
 452         case VIRTIO_STATUS_PORT:
 453             if (length != 1) {
 454                 PrintError(core->vm_info, core, "Illegal read length for status (len=%d)\n", length);
 455                 return -1;
 456             }
 457
 458             *(uint8_t *)dst = blk_state->virtio_cfg.status;
 459             break;
 460
 461         case VIRTIO_ISR_PORT:
 462             *(uint8_t *)dst = blk_state->virtio_cfg.pci_isr;
 463             blk_state->virtio_cfg.pci_isr = 0;
 464             v3_pci_lower_irq(blk_state->virtio_dev->pci_bus, blk_state->pci_dev, 0);
 465             break;
 466
 467         default:
 468             if ( (port_idx >= sizeof(struct virtio_config)) &&
 469                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct blk_config))) ) {
 470                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 471                 uint8_t * cfg_ptr = (uint8_t *)&(blk_state->block_cfg);
 472
 473                 memcpy(dst, cfg_ptr + cfg_offset, length);
 474
 475             } else {
 476
 477                 PrintError(core->vm_info,core,"Read of Unhandled Virtio Read. Returning 0\n");
 478                 if (length == 1) {
 479                     *(uint8_t *)dst = 0;
 480                 } else if (length == 2) {
 481                     *(uint16_t *)dst = 0;
 482                 } else if (length == 4) {
 483                     *(uint32_t *)dst = 0;
 484                 }
 485
 486             }
 487
 488             break;
 489     }
 490
 491     return length;
 492 }
 493
 494
 495 static int virtio_free(struct virtio_dev_state * virtio) {
 496     struct virtio_blk_state * blk_state = NULL;
 497     struct virtio_blk_state * tmp = NULL;
 498
 499     list_for_each_entry_safe(blk_state, tmp, &(virtio->dev_list), dev_link) {
 500
 501         // unregister from PCI
 502
 503         list_del(&(blk_state->dev_link));
 504         V3_Free(blk_state);
 505     }
 506
 507
 508     V3_Free(virtio);
 509
 510     return 0;
 511 }
 512
 513
 514
 515 static struct v3_device_ops dev_ops = {
 516     .free = (int (*)(void *))virtio_free,
 517
 518 };
 519
 520
 521
 522
 523
 524 static int register_dev(struct virtio_dev_state * virtio, struct virtio_blk_state * blk_state) {
 525     // initialize PCI
 526     struct pci_device * pci_dev = NULL;
 527     struct v3_pci_bar bars[6];
 528     int num_ports = sizeof(struct virtio_config) + sizeof(struct blk_config);
 529     int tmp_ports = num_ports;
 530     int i;
 531
 532
 533
 534     // This gets the number of ports, rounded up to a power of 2
 535     blk_state->io_range_size = 1; // must be a power of 2
 536
 537     while (tmp_ports > 0) {
 538         tmp_ports >>= 1;
 539         blk_state->io_range_size <<= 1;
 540     }
 541
 542     // this is to account for any low order bits being set in num_ports
 543     // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 544     if ((num_ports & ((blk_state->io_range_size >> 1) - 1)) == 0) {
 545         blk_state->io_range_size >>= 1;
 546     }
 547
 548
 549     for (i = 0; i < 6; i++) {
 550         bars[i].type = PCI_BAR_NONE;
 551     }
 552
 553     PrintDebug(VM_NONE, VCORE_NONE, "Virtio-BLK io_range_size = %d\n", blk_state->io_range_size);
 554
 555     bars[0].type = PCI_BAR_IO;
 556     bars[0].default_base_port = -1;
 557     bars[0].num_ports = blk_state->io_range_size;
 558
 559     bars[0].io_read = virtio_io_read;
 560     bars[0].io_write = virtio_io_write;
 561     bars[0].private_data = blk_state;
 562
 563     pci_dev = v3_pci_register_device(virtio->pci_bus, PCI_STD_DEVICE,
 564                                      0, PCI_AUTO_DEV_NUM, 0,
 565                                      "LNX_VIRTIO_BLK", bars,
 566                                      NULL, NULL, NULL, NULL, blk_state);
 567
 568     if (!pci_dev) {
 569         PrintError(VM_NONE, VCORE_NONE, "Could not register PCI Device\n");
 570         return -1;
 571     }
 572
 573     pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 574     pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 575
 576
 577     pci_dev->config_header.device_id = VIRTIO_BLOCK_DEV_ID;
 578     pci_dev->config_header.class = PCI_CLASS_STORAGE;
 579     pci_dev->config_header.subclass = PCI_STORAGE_SUBCLASS_OTHER;
 580
 581     pci_dev->config_header.subsystem_id = VIRTIO_BLOCK_SUBDEVICE_ID;
 582
 583
 584     pci_dev->config_header.intr_pin = 1;
 585
 586     pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 587
 588
 589     blk_state->pci_dev = pci_dev;
 590
 591
 592     /* Add backend to list of devices */
 593     list_add(&(blk_state->dev_link), &(virtio->dev_list));
 594
 595     /* Block configuration */
 596     blk_state->virtio_cfg.host_features = VIRTIO_SEG_MAX;
 597     blk_state->block_cfg.max_seg = QUEUE_SIZE - 2;
 598
 599
 600     // Virtio Block only uses one queue
 601     blk_state->queue.queue_size = QUEUE_SIZE;
 602
 603     blk_state->virtio_dev = virtio;
 604
 605     blk_reset(blk_state);
 606
 607
 608     return 0;
 609 }
 610
 611
 612 static int connect_fn(struct v3_vm_info * vm,
 613                       void * frontend_data,
 614                       struct v3_dev_blk_ops * ops,
 615                       v3_cfg_tree_t * cfg,
 616                       void * private_data) {
 617
 618     struct virtio_dev_state * virtio = (struct virtio_dev_state *)frontend_data;
 619
 620     struct virtio_blk_state * blk_state  = (struct virtio_blk_state *)V3_Malloc(sizeof(struct virtio_blk_state));
 621
 622     if (!blk_state) {
 623         PrintError(vm, VCORE_NONE, "Cannot allocate in connect\n");
 624         return -1;
 625     }
 626
 627
 628     memset(blk_state, 0, sizeof(struct virtio_blk_state));
 629
 630     register_dev(virtio, blk_state);
 631
 632     blk_state->ops = ops;
 633     blk_state->backend_data = private_data;
 634
 635     blk_state->block_cfg.capacity = ops->get_capacity(private_data) / SECTOR_SIZE;
 636
 637     PrintDebug(vm, VCORE_NONE, "Virtio Capacity = %d -- 0x%p\n", (int)(blk_state->block_cfg.capacity),
 638                (void *)(addr_t)(blk_state->block_cfg.capacity));
 639
 640     return 0;
 641 }
 642
 643
 644 static int virtio_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 645     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 646     struct virtio_dev_state * virtio_state = NULL;
 647     char * dev_id = v3_cfg_val(cfg, "ID");
 648
 649     PrintDebug(vm, VCORE_NONE, "Initializing VIRTIO Block device\n");
 650
 651     if (pci_bus == NULL) {
 652         PrintError(vm, VCORE_NONE, "VirtIO devices require a PCI Bus");
 653         return -1;
 654     }
 655
 656
 657     virtio_state  = (struct virtio_dev_state *)V3_Malloc(sizeof(struct virtio_dev_state));
 658
 659     if (!virtio_state) {
 660         PrintError(vm, VCORE_NONE, "Cannot allocate in init\n");
 661         return -1;
 662     }
 663
 664     memset(virtio_state, 0, sizeof(struct virtio_dev_state));
 665
 666     INIT_LIST_HEAD(&(virtio_state->dev_list));
 667     virtio_state->pci_bus = pci_bus;
 668
 669
 670     struct vm_device * dev = v3_add_device(vm, dev_id, &dev_ops, virtio_state);
 671
 672     if (dev == NULL) {
 673         PrintError(vm, VCORE_NONE, "Could not attach device %s\n", dev_id);
 674         V3_Free(virtio_state);
 675         return -1;
 676     }
 677
 678     if (v3_dev_add_blk_frontend(vm, dev_id, connect_fn, (void *)virtio_state) == -1) {
 679         PrintError(vm, VCORE_NONE, "Could not register %s as block frontend\n", dev_id);
 680         v3_remove_device(dev);
 681         return -1;
 682     }
 683
 684     return 0;
 685 }
 686
 687
 688 device_register("LNX_VIRTIO_BLK", virtio_init)