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 <devices/lnx_virtio_blk.h>
  24 #include <devices/block_dev.h>
  25 #include <palacios/vm_guest_mem.h>
  26
  27 #include <devices/pci.h>
  28
  29
  30
  31 #ifndef CONFIG_DEBUG_VIRTIO_BLK
  32 #undef PrintDebug
  33 #define PrintDebug(fmt, args...)
  34 #endif
  35
  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 } __attribute__((packed));
  63
  64
  65
  66 struct blk_op_hdr {
  67     uint32_t type;
  68     uint32_t prior;
  69     uint64_t sector;
  70 } __attribute__((packed));
  71
  72 #define QUEUE_SIZE 128
  73
  74 /* Host Feature flags */
  75 #define VIRTIO_BARRIER       0x01       /* Does host support barriers? */
  76 #define VIRTIO_SIZE_MAX      0x02       /* Indicates maximum segment size */
  77 #define VIRTIO_SEG_MAX       0x04       /* Indicates maximum # of segments */
  78 #define VIRTIO_LEGACY_GEOM   0x10       /* Indicates support of legacy geometry */
  79
  80
  81 struct virtio_dev_state {
  82     struct vm_device * pci_bus;
  83     struct list_head dev_list;
  84     struct guest_info * vm;
  85 };
  86
  87 struct virtio_blk_state {
  88
  89     struct pci_device * pci_dev;
  90     struct blk_config block_cfg;
  91     struct virtio_config virtio_cfg;
  92
  93
  94     struct virtio_queue queue;
  95
  96     union {
  97         struct v3_cd_ops * cd_ops;
  98         struct v3_hd_ops * hd_ops;
  99     };
 100
 101     v3_block_type_t block_type;
 102     void * backend_data;
 103
 104     int io_range_size;
 105
 106     struct virtio_dev_state * virtio_dev;
 107
 108     struct list_head dev_link;
 109 };
 110
 111
 112 static int virtio_free(struct vm_device * dev) {
 113     return -1;
 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 static int virtio_reset(struct vm_device * dev) {
 131     struct virtio_dev_state * dev_state = (struct virtio_dev_state *)(dev->private_data);
 132     struct virtio_blk_state * blk_state = NULL;
 133
 134     list_for_each_entry(blk_state, &(dev_state->dev_list), dev_link) {
 135         blk_reset(blk_state);
 136     }
 137
 138     return 0;
 139 }
 140
 141 static int handle_read_op(struct virtio_blk_state * blk_state, uint8_t * buf, uint64_t * sector, uint32_t len) {
 142     int ret = -1;
 143
 144     if (blk_state->block_type == BLOCK_DISK) {
 145         if (len % HD_SECTOR_SIZE) {
 146             PrintError("Write of something that is not a sector len %d, mod=%d\n", len, len % HD_SECTOR_SIZE);
 147             return -1;
 148         }
 149
 150
 151         PrintDebug("Reading Disk\n");
 152
 153         ret = blk_state->hd_ops->read(buf, len / HD_SECTOR_SIZE, *sector, blk_state->backend_data);
 154
 155         *sector += len / HD_SECTOR_SIZE;
 156
 157     } else if (blk_state->block_type == BLOCK_CDROM) {
 158         if (len % ATAPI_BLOCK_SIZE) {
 159             PrintError("Write of something that is not an ATAPI block len %d, mod=%d\n", len, len % ATAPI_BLOCK_SIZE);
 160             return -1;
 161         }
 162
 163         ret = blk_state->cd_ops->read(buf, len / ATAPI_BLOCK_SIZE, *sector , blk_state->backend_data);
 164
 165         *sector += len / ATAPI_BLOCK_SIZE;
 166     }
 167
 168     return ret;
 169 }
 170
 171
 172 static int handle_write_op(struct virtio_blk_state * blk_state, uint8_t * buf, uint64_t * sector, uint32_t len) {
 173     int ret = -1;
 174
 175     if (blk_state->block_type == BLOCK_DISK) {
 176         if (len % HD_SECTOR_SIZE) {
 177             PrintError("Write of something that is not a sector len %d, mod=%d\n", len, len % HD_SECTOR_SIZE);
 178             return -1;
 179         }
 180
 181         PrintDebug("Writing Disk\n");
 182
 183         ret = blk_state->hd_ops->write(buf, len / HD_SECTOR_SIZE, *sector, blk_state->backend_data);
 184
 185         *sector += len / HD_SECTOR_SIZE;
 186     }
 187
 188     return ret;
 189 }
 190
 191
 192
 193 // multiple block operations need to increment the sector
 194
 195 static int handle_block_op(struct virtio_blk_state * blk_state, struct blk_op_hdr * hdr,
 196                            struct vring_desc * buf_desc, uint8_t * status) {
 197     uint8_t * buf = NULL;
 198
 199     PrintDebug("Handling Block op\n");
 200
 201
 202
 203     if (guest_pa_to_host_va(blk_state->virtio_dev->vm, buf_desc->addr_gpa, (addr_t *)&(buf)) == -1) {
 204         PrintError("Could not translate buffer address\n");
 205         return -1;
 206     }
 207
 208
 209     PrintDebug("Sector=%p Length=%d\n", (void *)(addr_t)(hdr->sector), buf_desc->length);
 210
 211     if (hdr->type == BLK_IN_REQ) {
 212         if (blk_state->block_type != BLOCK_NONE) {
 213             if (handle_read_op(blk_state, buf, &(hdr->sector), buf_desc->length) == -1) {
 214                 *status = BLK_STATUS_ERR;
 215                 return -1;
 216             } else {
 217                 *status = BLK_STATUS_OK;
 218             }
 219         } else {
 220             *status = BLK_STATUS_NOT_SUPPORTED;
 221         }
 222
 223     } else if (hdr->type == BLK_OUT_REQ) {
 224         if (blk_state->block_type == BLOCK_DISK) {
 225             if (handle_write_op(blk_state, buf, &(hdr->sector), buf_desc->length) == -1) {
 226                 *status = BLK_STATUS_ERR;
 227                 return -1;
 228             } else {
 229                 *status = BLK_STATUS_OK;
 230             }
 231
 232         } else {
 233             *status = BLK_STATUS_NOT_SUPPORTED;
 234         }
 235
 236     } else if (hdr->type == BLK_SCSI_CMD) {
 237         PrintError("VIRTIO: SCSI Command Not supported!!!\n");
 238         *status = BLK_STATUS_NOT_SUPPORTED;
 239         return -1;
 240     }
 241
 242
 243
 244     PrintDebug("Returning Status: %d\n", *status);
 245
 246     return 0;
 247 }
 248
 249 static int get_desc_count(struct virtio_queue * q, int index) {
 250     struct vring_desc * tmp_desc = &(q->desc[index]);
 251     int cnt = 1;
 252
 253     while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
 254         tmp_desc = &(q->desc[tmp_desc->next]);
 255         cnt++;
 256     }
 257
 258     return cnt;
 259 }
 260
 261
 262
 263 static int handle_kick(struct virtio_blk_state * blk_state) {
 264     struct virtio_queue * q = &(blk_state->queue);
 265
 266     PrintDebug("VIRTIO KICK: cur_index=%d (mod=%d), avail_index=%d\n",
 267                q->cur_avail_idx, q->cur_avail_idx % QUEUE_SIZE, q->avail->index);
 268
 269     while (q->cur_avail_idx < q->avail->index) {
 270         struct vring_desc * hdr_desc = NULL;
 271         struct vring_desc * buf_desc = NULL;
 272         struct vring_desc * status_desc = NULL;
 273         struct blk_op_hdr hdr;
 274         addr_t hdr_addr = 0;
 275         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 276         int desc_cnt = get_desc_count(q, desc_idx);
 277         int i = 0;
 278         uint8_t * status_ptr = NULL;
 279         uint8_t status = BLK_STATUS_OK;
 280         uint32_t req_len = 0;
 281
 282         PrintDebug("Descriptor Count=%d, index=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE);
 283
 284         if (desc_cnt < 3) {
 285             PrintError("Block operations must include at least 3 descriptors\n");
 286             return -1;
 287         }
 288
 289         hdr_desc = &(q->desc[desc_idx]);
 290
 291
 292         PrintDebug("Header Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", hdr_desc,
 293                    (void *)(hdr_desc->addr_gpa), hdr_desc->length, hdr_desc->flags, hdr_desc->next);
 294
 295         if (guest_pa_to_host_va(blk_state->virtio_dev->vm, hdr_desc->addr_gpa, &(hdr_addr)) == -1) {
 296             PrintError("Could not translate block header address\n");
 297             return -1;
 298         }
 299
 300         // We copy the block op header out because we are going to modify its contents
 301         memcpy(&hdr, (void *)hdr_addr, sizeof(struct blk_op_hdr));
 302
 303         PrintDebug("Blk Op Hdr (ptr=%p) type=%d, sector=%p\n", (void *)hdr_addr, hdr.type, (void *)hdr.sector);
 304
 305         desc_idx = hdr_desc->next;
 306
 307         for (i = 0; i < desc_cnt - 2; i++) {
 308             uint8_t tmp_status = BLK_STATUS_OK;
 309
 310             buf_desc = &(q->desc[desc_idx]);
 311
 312             PrintDebug("Buffer Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", buf_desc,
 313                        (void *)(buf_desc->addr_gpa), buf_desc->length, buf_desc->flags, buf_desc->next);
 314
 315             if (handle_block_op(blk_state, &hdr, buf_desc, &tmp_status) == -1) {
 316                 PrintError("Error handling block operation\n");
 317                 return -1;
 318             }
 319
 320             if (tmp_status != BLK_STATUS_OK) {
 321                 status = tmp_status;
 322             }
 323
 324             req_len += buf_desc->length;
 325             desc_idx = buf_desc->next;
 326         }
 327
 328         status_desc = &(q->desc[desc_idx]);
 329
 330         PrintDebug("Status Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", status_desc,
 331                    (void *)(status_desc->addr_gpa), status_desc->length, status_desc->flags, status_desc->next);
 332
 333         if (guest_pa_to_host_va(blk_state->virtio_dev->vm, status_desc->addr_gpa, (addr_t *)&(status_ptr)) == -1) {
 334             PrintError("Could not translate status address\n");
 335             return -1;
 336         }
 337
 338         req_len += status_desc->length;
 339         *status_ptr = status;
 340
 341         q->used->ring[q->used->index % QUEUE_SIZE].id = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 342         q->used->ring[q->used->index % QUEUE_SIZE].length = req_len; // What do we set this to????
 343
 344         q->used->index++;
 345         q->cur_avail_idx++;
 346     }
 347
 348     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 349         PrintDebug("Raising IRQ %d\n",  blk_state->pci_dev->config_header.intr_line);
 350         v3_pci_raise_irq(blk_state->virtio_dev->pci_bus, 0, blk_state->pci_dev);
 351         blk_state->virtio_cfg.pci_isr = 1;
 352     }
 353
 354     return 0;
 355 }
 356
 357 static int virtio_io_write(uint16_t port, void * src, uint_t length, void * private_data) {
 358     struct virtio_blk_state * blk_state = (struct virtio_blk_state *)private_data;
 359     int port_idx = port % blk_state->io_range_size;
 360
 361
 362     PrintDebug("VIRTIO BLOCK Write for port %d (index=%d) len=%d, value=%x\n",
 363                port, port_idx,  length, *(uint32_t *)src);
 364
 365
 366
 367     switch (port_idx) {
 368         case GUEST_FEATURES_PORT:
 369             if (length != 4) {
 370                 PrintError("Illegal write length for guest features\n");
 371                 return -1;
 372             }
 373
 374             blk_state->virtio_cfg.guest_features = *(uint32_t *)src;
 375             PrintDebug("Setting Guest Features to %x\n", blk_state->virtio_cfg.guest_features);
 376
 377             break;
 378         case VRING_PG_NUM_PORT:
 379             if (length == 4) {
 380                 addr_t pfn = *(uint32_t *)src;
 381                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 382
 383
 384                 blk_state->queue.pfn = pfn;
 385
 386                 blk_state->queue.ring_desc_addr = page_addr ;
 387                 blk_state->queue.ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 388                 blk_state->queue.ring_used_addr = ( blk_state->queue.ring_avail_addr + \
 389                                                  sizeof(struct vring_avail)    + \
 390                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 391
 392                 // round up to next page boundary.
 393                 blk_state->queue.ring_used_addr = (blk_state->queue.ring_used_addr + 0xfff) & ~0xfff;
 394
 395                 if (guest_pa_to_host_va(blk_state->virtio_dev->vm, blk_state->queue.ring_desc_addr, (addr_t *)&(blk_state->queue.desc)) == -1) {
 396                     PrintError("Could not translate ring descriptor address\n");
 397                     return -1;
 398                 }
 399
 400
 401                 if (guest_pa_to_host_va(blk_state->virtio_dev->vm, blk_state->queue.ring_avail_addr, (addr_t *)&(blk_state->queue.avail)) == -1) {
 402                     PrintError("Could not translate ring available address\n");
 403                     return -1;
 404                 }
 405
 406
 407                 if (guest_pa_to_host_va(blk_state->virtio_dev->vm, blk_state->queue.ring_used_addr, (addr_t *)&(blk_state->queue.used)) == -1) {
 408                     PrintError("Could not translate ring used address\n");
 409                     return -1;
 410                 }
 411
 412                 PrintDebug("RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 413                            (void *)(blk_state->queue.ring_desc_addr),
 414                            (void *)(blk_state->queue.ring_avail_addr),
 415                            (void *)(blk_state->queue.ring_used_addr));
 416
 417                 PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n",
 418                            blk_state->queue.desc, blk_state->queue.avail, blk_state->queue.used);
 419
 420             } else {
 421                 PrintError("Illegal write length for page frame number\n");
 422                 return -1;
 423             }
 424             break;
 425         case VRING_Q_SEL_PORT:
 426             blk_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 427
 428             if (blk_state->virtio_cfg.vring_queue_selector != 0) {
 429                 PrintError("Virtio Block device only uses 1 queue, selected %d\n",
 430                            blk_state->virtio_cfg.vring_queue_selector);
 431                 return -1;
 432             }
 433
 434             break;
 435         case VRING_Q_NOTIFY_PORT:
 436             PrintDebug("Handling Kick\n");
 437             if (handle_kick(blk_state) == -1) {
 438                 PrintError("Could not handle Block Notification\n");
 439                 return -1;
 440             }
 441             break;
 442         case VIRTIO_STATUS_PORT:
 443             blk_state->virtio_cfg.status = *(uint8_t *)src;
 444
 445             if (blk_state->virtio_cfg.status == 0) {
 446                 PrintDebug("Resetting device\n");
 447                 blk_reset(blk_state);
 448             }
 449
 450             break;
 451
 452         case VIRTIO_ISR_PORT:
 453             blk_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 454             break;
 455         default:
 456             return -1;
 457             break;
 458     }
 459
 460     return length;
 461 }
 462
 463
 464 static int virtio_io_read(uint16_t port, void * dst, uint_t length, void * private_data) {
 465     struct virtio_blk_state * blk_state = (struct virtio_blk_state *)private_data;
 466     int port_idx = port % blk_state->io_range_size;
 467
 468
 469     PrintDebug("VIRTIO BLOCK Read  for port %d (index =%d), length=%d\n",
 470                port, port_idx, length);
 471
 472     switch (port_idx) {
 473         case HOST_FEATURES_PORT:
 474             if (length != 4) {
 475                 PrintError("Illegal read length for host features\n");
 476                 return -1;
 477             }
 478
 479             *(uint32_t *)dst = blk_state->virtio_cfg.host_features;
 480
 481             break;
 482         case VRING_PG_NUM_PORT:
 483             if (length != 4) {
 484                 PrintError("Illegal read length for page frame number\n");
 485                 return -1;
 486             }
 487
 488             *(uint32_t *)dst = blk_state->queue.pfn;
 489
 490             break;
 491         case VRING_SIZE_PORT:
 492             if (length != 2) {
 493                 PrintError("Illegal read length for vring size\n");
 494                 return -1;
 495             }
 496
 497             *(uint16_t *)dst = blk_state->queue.queue_size;
 498
 499             break;
 500
 501         case VIRTIO_STATUS_PORT:
 502             if (length != 1) {
 503                 PrintError("Illegal read length for status\n");
 504                 return -1;
 505             }
 506
 507             *(uint8_t *)dst = blk_state->virtio_cfg.status;
 508             break;
 509
 510         case VIRTIO_ISR_PORT:
 511             *(uint8_t *)dst = blk_state->virtio_cfg.pci_isr;
 512             blk_state->virtio_cfg.pci_isr = 0;
 513             v3_pci_lower_irq(blk_state->virtio_dev->pci_bus, 0, blk_state->pci_dev);
 514             break;
 515
 516         default:
 517             if ( (port_idx >= sizeof(struct virtio_config)) &&
 518                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct blk_config))) ) {
 519                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 520                 uint8_t * cfg_ptr = (uint8_t *)&(blk_state->block_cfg);
 521
 522                 memcpy(dst, cfg_ptr + cfg_offset, length);
 523
 524             } else {
 525                 PrintError("Read of Unhandled Virtio Read\n");
 526                 return -1;
 527             }
 528
 529             break;
 530     }
 531
 532     return length;
 533 }
 534
 535
 536
 537
 538 static struct v3_device_ops dev_ops = {
 539     .free = virtio_free,
 540     .reset = virtio_reset,
 541     .start = NULL,
 542     .stop = NULL,
 543 };
 544
 545
 546
 547
 548
 549 static int register_dev(struct virtio_dev_state * virtio, struct virtio_blk_state * blk_state) {
 550     // initialize PCI
 551     struct pci_device * pci_dev = NULL;
 552     struct v3_pci_bar bars[6];
 553     int num_ports = sizeof(struct virtio_config) + sizeof(struct blk_config);
 554     int tmp_ports = num_ports;
 555     int i;
 556
 557
 558
 559     // This gets the number of ports, rounded up to a power of 2
 560     blk_state->io_range_size = 1; // must be a power of 2
 561
 562     while (tmp_ports > 0) {
 563         tmp_ports >>= 1;
 564         blk_state->io_range_size <<= 1;
 565     }
 566
 567     // this is to account for any low order bits being set in num_ports
 568     // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 569     if ((num_ports & ((blk_state->io_range_size >> 1) - 1)) == 0) {
 570         blk_state->io_range_size >>= 1;
 571     }
 572
 573
 574     for (i = 0; i < 6; i++) {
 575         bars[i].type = PCI_BAR_NONE;
 576     }
 577
 578     PrintDebug("Virtio-BLK io_range_size = %d\n", blk_state->io_range_size);
 579
 580     bars[0].type = PCI_BAR_IO;
 581     bars[0].default_base_port = -1;
 582     bars[0].num_ports = blk_state->io_range_size;
 583
 584     bars[0].io_read = virtio_io_read;
 585     bars[0].io_write = virtio_io_write;
 586     bars[0].private_data = blk_state;
 587
 588     pci_dev = v3_pci_register_device(virtio->pci_bus, PCI_STD_DEVICE,
 589                                      0, PCI_AUTO_DEV_NUM, 0,
 590                                      "LNX_VIRTIO_BLK", bars,
 591                                      NULL, NULL, NULL, blk_state);
 592
 593     if (!pci_dev) {
 594         PrintError("Could not register PCI Device\n");
 595         return -1;
 596     }
 597
 598     pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 599     pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 600
 601
 602     pci_dev->config_header.device_id = VIRTIO_BLOCK_DEV_ID;
 603     pci_dev->config_header.class = PCI_CLASS_STORAGE;
 604     pci_dev->config_header.subclass = PCI_STORAGE_SUBCLASS_OTHER;
 605
 606     pci_dev->config_header.subsystem_id = VIRTIO_BLOCK_SUBDEVICE_ID;
 607
 608
 609     pci_dev->config_header.intr_pin = 1;
 610
 611     pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 612
 613
 614     blk_state->pci_dev = pci_dev;
 615
 616     /* Block configuration */
 617     blk_state->virtio_cfg.host_features = VIRTIO_SEG_MAX;
 618     blk_state->block_cfg.max_seg = QUEUE_SIZE - 2;
 619
 620     // Virtio Block only uses one queue
 621     blk_state->queue.queue_size = QUEUE_SIZE;
 622
 623     blk_state->virtio_dev = virtio;
 624
 625     blk_reset(blk_state);
 626
 627
 628     return 0;
 629 }
 630
 631
 632 int v3_virtio_register_cdrom(struct vm_device * dev, struct v3_cd_ops * ops, void * private_data) {
 633     struct virtio_dev_state * virtio = (struct virtio_dev_state *)dev->private_data;
 634     struct virtio_blk_state * blk_state  = (struct virtio_blk_state *)V3_Malloc(sizeof(struct virtio_blk_state));
 635     memset(blk_state, 0, sizeof(struct virtio_blk_state));
 636
 637     register_dev(virtio, blk_state);
 638
 639     blk_state->block_type = BLOCK_CDROM;
 640     blk_state->cd_ops = ops;
 641     blk_state->backend_data = private_data;
 642
 643     blk_state->block_cfg.capacity = ops->get_capacity(private_data);
 644
 645     return 0;
 646 }
 647
 648
 649 int v3_virtio_register_harddisk(struct vm_device * dev, struct v3_hd_ops * ops, void * private_data) {
 650     struct virtio_dev_state * virtio = (struct virtio_dev_state *)dev->private_data;
 651     struct virtio_blk_state * blk_state  = (struct virtio_blk_state *)V3_Malloc(sizeof(struct virtio_blk_state));
 652     memset(blk_state, 0, sizeof(struct virtio_blk_state));
 653
 654     register_dev(virtio, blk_state);
 655
 656     blk_state->block_type = BLOCK_DISK;
 657     blk_state->hd_ops = ops;
 658     blk_state->backend_data = private_data;
 659
 660     blk_state->block_cfg.capacity = ops->get_capacity(private_data);
 661
 662     PrintDebug("Virtio Capacity = %d -- 0x%p\n", (int)(virtio->block_cfg.capacity),
 663         (void *)(addr_t)(virtio->block_cfg.capacity));
 664
 665     return 0;
 666 }
 667
 668
 669
 670
 671 static int virtio_init(struct guest_info * vm, void * cfg_data) {
 672     struct vm_device * pci_bus = v3_find_dev(vm, (char *)cfg_data);
 673     struct virtio_dev_state * virtio_state = NULL;
 674
 675
 676     PrintDebug("Initializing VIRTIO Block device\n");
 677
 678     if (pci_bus == NULL) {
 679         PrintError("VirtIO devices require a PCI Bus");
 680         return -1;
 681     }
 682
 683
 684     virtio_state  = (struct virtio_dev_state *)V3_Malloc(sizeof(struct virtio_dev_state));
 685     memset(virtio_state, 0, sizeof(struct virtio_dev_state));
 686
 687     INIT_LIST_HEAD(&(virtio_state->dev_list));
 688     virtio_state->pci_bus = pci_bus;
 689     virtio_state->vm = vm;
 690
 691     struct vm_device * dev = v3_allocate_device("LNX_VIRTIO_BLK", &dev_ops, virtio_state);
 692     if (v3_attach_device(vm, dev) == -1) {
 693         PrintError("Could not attach device %s\n", "LNX_VIRTIO_BLK");
 694         return -1;
 695     }
 696
 697     return 0;
 698 }
 699
 700
 701
 702
 703 device_register("LNX_VIRTIO_BLK", virtio_init)