palacios/src/devices/lnx_virtio_vnet.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 <palacios/vm_guest_mem.h>
  23 #include <devices/lnx_virtio_pci.h>
  24 #include <palacios/vmm_vnet.h>
  25 #include <palacios/vmm_sprintf.h>
  26 #include <devices/pci.h>
  27
  28
  29 #ifndef CONFIG_DEBUG_LINUX_VIRTIO_VNET
  30 #undef PrintDebug
  31 #define PrintDebug(fmt, args...)
  32 #endif
  33
  34
  35 #define QUEUE_SIZE 128
  36 #define NUM_QUEUES 3
  37
  38 struct vnet_config {
  39     uint32_t num_devs;
  40     uint32_t num_routes;
  41 } __attribute__((packed));
  42
  43
  44 #define CTRL_QUEUE 0
  45 #define XMIT_QUEUE 1
  46 #define RECV_QUEUE 2
  47
  48 struct virtio_vnet_state {
  49     struct v3_vm_info * vm;
  50     struct vnet_config vnet_cfg;
  51     struct virtio_config virtio_cfg;
  52
  53     struct vm_device * pci_bus;
  54     struct pci_device * pci_dev;
  55
  56     struct virtio_queue queue[NUM_QUEUES];
  57
  58     struct virtio_queue * cur_queue;
  59
  60     int io_range_size;
  61     v3_lock_t lock;
  62 };
  63
  64 #define VNET_GET_ROUTES 10
  65 #define VNET_ADD_ROUTE 11
  66 #define VNET_DEL_ROUTE 12
  67
  68 #define VNET_GET_LINKS 20
  69 #define VNET_ADD_LINK 21
  70 #define VNET_DEL_LINK 22
  71
  72 // structure of the vnet command header
  73 struct vnet_ctrl_hdr {
  74     uint8_t cmd_type;
  75     uint32_t num_cmds;
  76 } __attribute__((packed));
  77
  78 struct vnet_virtio_pkt {
  79     uint32_t link_id;
  80     uint32_t pkt_size;
  81     uint8_t pkt[ETHERNET_PACKET_LEN];
  82 }__attribute__((packed));
  83
  84
  85 static int virtio_reset(struct virtio_vnet_state * vnet_state) {
  86
  87     memset(vnet_state->queue, 0, sizeof(struct virtio_queue) * 2);
  88
  89     vnet_state->cur_queue = &(vnet_state->queue[0]);
  90
  91     vnet_state->virtio_cfg.status = 0;
  92     vnet_state->virtio_cfg.pci_isr = 0;
  93
  94     vnet_state->queue[0].queue_size = QUEUE_SIZE;
  95     vnet_state->queue[1].queue_size = QUEUE_SIZE;
  96     vnet_state->queue[2].queue_size = QUEUE_SIZE;
  97
  98     memset(&(vnet_state->vnet_cfg), 0, sizeof(struct vnet_config));
  99     v3_lock_init(&(vnet_state->lock));
 100
 101     return 0;
 102 }
 103
 104
 105
 106 static int get_desc_count(struct virtio_queue * q, int index) {
 107     struct vring_desc * tmp_desc = &(q->desc[index]);
 108     int cnt = 1;
 109
 110     while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
 111         tmp_desc = &(q->desc[tmp_desc->next]);
 112         cnt++;
 113     }
 114
 115     return cnt;
 116 }
 117
 118
 119
 120
 121 static int handle_cmd_kick(struct guest_info * core, struct virtio_vnet_state * vnet_state) {
 122     struct virtio_queue * q = &(vnet_state->queue[0]);
 123
 124     PrintDebug("VNET Bridge: Handling command  queue\n");
 125
 126     while (q->cur_avail_idx != q->avail->index) {
 127         struct vring_desc * hdr_desc = NULL;
 128         struct vring_desc * buf_desc = NULL;
 129         struct vring_desc * status_desc = NULL;
 130         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 131         uint16_t desc_cnt = get_desc_count(q, desc_idx);
 132         struct vnet_ctrl_hdr * hdr = NULL;
 133         int i;
 134         int xfer_len = 0;
 135         uint8_t * status_ptr = NULL;
 136         uint8_t status = 0;
 137
 138
 139         PrintDebug("VNET Bridge: CMD: Descriptor Count=%d, index=%d, desc_idx=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE, desc_idx);
 140
 141         if (desc_cnt < 3) {
 142             PrintError("VNET Bridge cmd must include at least 3 descriptors (cnt=%d)\n", desc_cnt);
 143             return -1;
 144         }
 145
 146         hdr_desc = &(q->desc[desc_idx]);
 147
 148         if (guest_pa_to_host_va(core, hdr_desc->addr_gpa, (addr_t *)&hdr) == -1) {
 149             PrintError("Could not translate VirtioVNET header address\n");
 150             return -1;
 151         }
 152
 153         desc_idx = hdr_desc->next;
 154
 155         if (hdr->cmd_type == VNET_ADD_ROUTE) {
 156
 157             for (i = 0; i < hdr->num_cmds; i++) {
 158                 uint8_t tmp_status = 0;
 159                 struct v3_vnet_route * route = NULL;
 160
 161                 buf_desc = &(q->desc[desc_idx]);
 162
 163                 if (guest_pa_to_host_va(core, buf_desc->addr_gpa, (addr_t *)&(route)) == -1) {
 164                     PrintError("Could not translate route address\n");
 165                     return -1;
 166                 }
 167
 168                 // add route
 169                 PrintDebug("VNET Bridge: Adding VNET Route\n");
 170
 171                 tmp_status = v3_vnet_add_route(*route);
 172
 173                 PrintDebug("VNET Route Added\n");
 174
 175                 if (tmp_status != 0) {
 176                     PrintError("Error adding VNET ROUTE\n");
 177                     status = tmp_status;
 178                 }
 179
 180                 xfer_len += buf_desc->length;
 181                 desc_idx = buf_desc->next;
 182             }
 183
 184         }
 185
 186
 187
 188         status_desc = &(q->desc[desc_idx]);
 189
 190         if (guest_pa_to_host_va(core, status_desc->addr_gpa, (addr_t *)&status_ptr) == -1) {
 191             PrintError("VirtioVNET Error could not translate status address\n");
 192             return -1;
 193         }
 194
 195         xfer_len += status_desc->length;
 196         *status_ptr = status;
 197
 198         PrintDebug("Transferred %d bytes (xfer_len)\n", xfer_len);
 199         q->used->ring[q->used->index % QUEUE_SIZE].id = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 200         q->used->ring[q->used->index % QUEUE_SIZE].length = xfer_len; // set to total inbound xfer length
 201
 202         q->used->index++;
 203         q->cur_avail_idx++;
 204     }
 205
 206
 207     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 208         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 209         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 210         vnet_state->virtio_cfg.pci_isr = 1;
 211     }
 212
 213
 214     return 0;
 215 }
 216
 217
 218 static int vnet_pkt_input_cb(struct v3_vm_info * vm,  struct v3_vnet_pkt * pkt,  void * private_data){
 219     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 220     struct virtio_queue * q = &(vnet_state->queue[RECV_QUEUE]);
 221     int ret_val = -1;
 222     unsigned long flags;
 223
 224     flags = v3_lock_irqsave(vnet_state->lock);
 225
 226     if (q->ring_avail_addr == 0) {
 227         PrintError("Queue is not set\n");
 228         goto exit;
 229     }
 230
 231
 232     if (q->cur_avail_idx != q->avail->index) {
 233         uint16_t pkt_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 234         struct vring_desc * pkt_desc = NULL;
 235         struct vnet_virtio_pkt * virtio_pkt = NULL;
 236
 237
 238         pkt_desc = &(q->desc[pkt_idx]);
 239         PrintDebug("VNET Bridge RX: buffer desc len: %d\n", pkt_desc->length);
 240
 241         if (guest_pa_to_host_va(&(vm->cores[0]), pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 242             PrintError("Could not translate buffer address\n");
 243             return -1;
 244         }
 245
 246         PrintDebug("VNET Bridge: RX: pkt sent to guest pkt size: %d, dst link: %d\n", pkt->size, pkt->dst_id);
 247
 248         // Fill in dst packet buffer
 249         virtio_pkt->link_id = pkt->dst_id;
 250         virtio_pkt->pkt_size = pkt->size;
 251         memcpy(virtio_pkt->pkt, pkt->data, pkt->size);
 252
 253         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 254         q->used->ring[q->used->index % q->queue_size].length = sizeof(struct vnet_virtio_pkt); // This should be the total length of data sent to guest (header+pkt_data)
 255
 256         q->used->index++;
 257         q->cur_avail_idx++;
 258     } else {
 259         PrintError("Packet buffer overflow in the guest: cur_avai_idx %d, idx: %d\n", q->cur_avail_idx, q->avail->index);
 260     }
 261
 262     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 263         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 264         vnet_state->virtio_cfg.pci_isr = 0x1;
 265         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 266     }
 267
 268     ret_val = 0;
 269
 270 exit:
 271     v3_unlock_irqrestore(vnet_state->lock, flags);
 272
 273     return ret_val;
 274 }
 275
 276
 277 static int handle_pkt_kick(struct guest_info *core, struct virtio_vnet_state * vnet_state)
 278 {
 279     struct virtio_queue * q = &(vnet_state->queue[XMIT_QUEUE]);
 280     struct v3_vnet_pkt pkt;
 281
 282     while (q->cur_avail_idx != q->avail->index) {
 283         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 284         struct vring_desc * pkt_desc = NULL;
 285         struct vnet_virtio_pkt * virtio_pkt = NULL;
 286
 287         pkt_desc = &(q->desc[desc_idx]);
 288
 289         PrintDebug("VNET Bridge: Handle TX desc buf_len: %d\n", pkt_desc->length);
 290
 291         //PrintDebug("q: %p, %p, %p, %d\n", q, vnet_state->queue, &vnet_state->queue[XMIT_QUEUE], XMIT_QUEUE);
 292         //PrintDebug("q->used: %p\n", q->used);
 293         //PrintDebug("q->used->ring %p\n", q->used->ring);
 294
 295         if (guest_pa_to_host_va(core, pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 296             PrintError("Could not translate buffer address\n");
 297             return -1;
 298         }
 299
 300         PrintDebug("VNET Bridge: TX: pkt size: %d, dst link: %d\n", virtio_pkt->pkt_size, virtio_pkt->link_id);
 301
 302         pkt.size = virtio_pkt->pkt_size;
 303         pkt.src_id = virtio_pkt->link_id;
 304         pkt.src_type = LINK_EDGE;
 305         memcpy(pkt.header, virtio_pkt->pkt, ETHERNET_HEADER_LEN);
 306         pkt.data = virtio_pkt->pkt;
 307
 308         v3_vnet_send_pkt(&pkt, NULL);
 309
 310         q = (struct virtio_queue *)((addr_t)vnet_state->queue + XMIT_QUEUE*sizeof(struct virtio_queue));
 311
 312         PrintDebug("After q: %p, , %p, %p, %d\n", q, vnet_state->queue, &(vnet_state->queue[XMIT_QUEUE]), XMIT_QUEUE);
 313         //PrintDebug("After q->used: %p\n", q->used);
 314         //PrintDebug("After q->used->ring %p\n", q->used->ring);
 315
 316         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 317         q->used->ring[q->used->index % q->queue_size].length = pkt_desc->length; // What do we set this to????
 318         q->used->index++;
 319
 320         q->cur_avail_idx++;
 321     }
 322
 323     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 324         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 325         vnet_state->virtio_cfg.pci_isr = 0x1;
 326     }
 327
 328     return 0;
 329 }
 330
 331 static int virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
 332     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 333     int port_idx = port % vnet_state->io_range_size;
 334
 335     PrintDebug("VNET Bridge: VIRTIO VNET Write for port %d len=%d, value=%x\n",
 336                port, length, *(uint32_t *)src);
 337     PrintDebug("VNET Bridge: port idx=%d\n", port_idx);
 338
 339
 340     switch (port_idx) {
 341         case GUEST_FEATURES_PORT:
 342             if (length != 4) {
 343                 PrintError("Illegal write length for guest features\n");
 344                 return -1;
 345             }
 346             vnet_state->virtio_cfg.guest_features = *(uint32_t *)src;
 347
 348             break;
 349         case VRING_PG_NUM_PORT:
 350             if (length == 4) {
 351                 addr_t pfn = *(uint32_t *)src;
 352                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 353
 354                 vnet_state->cur_queue->pfn = pfn;
 355
 356                 vnet_state->cur_queue->ring_desc_addr = page_addr ;
 357                 vnet_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 358                 vnet_state->cur_queue->ring_used_addr = ( vnet_state->cur_queue->ring_avail_addr + \
 359                                                  sizeof(struct vring_avail)    + \
 360                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 361
 362                 // round up to next page boundary.
 363                 vnet_state->cur_queue->ring_used_addr = (vnet_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
 364
 365                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_desc_addr, (addr_t *)&(vnet_state->cur_queue->desc)) == -1) {
 366                     PrintError("Could not translate ring descriptor address\n");
 367                     return -1;
 368                 }
 369
 370                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_avail_addr, (addr_t *)&(vnet_state->cur_queue->avail)) == -1) {
 371                     PrintError("Could not translate ring available address\n");
 372                     return -1;
 373                 }
 374
 375                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_used_addr, (addr_t *)&(vnet_state->cur_queue->used)) == -1) {
 376                     PrintError("Could not translate ring used address\n");
 377                     return -1;
 378                 }
 379
 380                 PrintDebug("VNET Bridge: RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 381                            (void *)(vnet_state->cur_queue->ring_desc_addr),
 382                            (void *)(vnet_state->cur_queue->ring_avail_addr),
 383                            (void *)(vnet_state->cur_queue->ring_used_addr));
 384
 385                 PrintDebug("VNET Bridge: RingDesc=%p, Avail=%p, Used=%p\n",
 386                            vnet_state->cur_queue->desc, vnet_state->cur_queue->avail, vnet_state->cur_queue->used);
 387
 388             } else {
 389                 PrintError("Illegal write length for page frame number\n");
 390                 return -1;
 391             }
 392             break;
 393         case VRING_Q_SEL_PORT:
 394             vnet_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 395
 396             if (vnet_state->virtio_cfg.vring_queue_selector > NUM_QUEUES) {
 397                 PrintError("VNET Bridge device has no qeueues. Selected %d\n",
 398                            vnet_state->virtio_cfg.vring_queue_selector);
 399                 return -1;
 400             }
 401
 402             vnet_state->cur_queue = &(vnet_state->queue[vnet_state->virtio_cfg.vring_queue_selector]);
 403
 404             break;
 405         case VRING_Q_NOTIFY_PORT: {
 406             uint16_t queue_idx = *(uint16_t *)src;
 407
 408             PrintDebug("VNET Bridge: Handling Kick\n");
 409
 410             if (queue_idx == 0) {
 411                 if (handle_cmd_kick(core, vnet_state) == -1) {
 412                     PrintError("Could not handle Virtio VNET Control command\n");
 413                     return -1;
 414                 }
 415             } else if (queue_idx == 1) {
 416                 if (handle_pkt_kick(core, vnet_state) == -1){
 417                     PrintError("Could not handle Virtio VNET TX\n");
 418                     return -1;
 419                 }
 420             } else if (queue_idx == 2) {
 421                 PrintDebug("VNET Bridge: receive kick on RX Queue\n");
 422             } else {
 423                 PrintError("VNET Bridge: Kick on invalid queue (%d)\n", queue_idx);
 424                 return -1;
 425             }
 426
 427             break;
 428         }
 429         case VIRTIO_STATUS_PORT:
 430             vnet_state->virtio_cfg.status = *(uint8_t *)src;
 431
 432             if (vnet_state->virtio_cfg.status == 0) {
 433                 PrintDebug("VNET Bridge: Resetting device\n");
 434                 virtio_reset(vnet_state);
 435             }
 436
 437             break;
 438
 439         case VIRTIO_ISR_PORT:
 440             vnet_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 441             break;
 442         default:
 443             return -1;
 444             break;
 445     }
 446
 447     return length;
 448 }
 449
 450
 451 static int virtio_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
 452
 453     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 454     int port_idx = port % vnet_state->io_range_size;
 455
 456 /*
 457     PrintDebug("VirtioVNET: VIRTIO SYMBIOTIC Read  for port %d (index =%d), length=%d\n",
 458                port, port_idx, length);
 459 */
 460     switch (port_idx) {
 461         case HOST_FEATURES_PORT:
 462             if (length != 4) {
 463                 PrintError("Illegal read length for host features\n");
 464                 return -1;
 465             }
 466
 467             *(uint32_t *)dst = vnet_state->virtio_cfg.host_features;
 468
 469             break;
 470         case VRING_PG_NUM_PORT:
 471             if (length != 4) {
 472                 PrintError("Illegal read length for page frame number\n");
 473                 return -1;
 474             }
 475
 476             *(uint32_t *)dst = vnet_state->cur_queue->pfn;
 477
 478             break;
 479         case VRING_SIZE_PORT:
 480             if (length != 2) {
 481                 PrintError("Illegal read length for vring size\n");
 482                 return -1;
 483             }
 484
 485             *(uint16_t *)dst = vnet_state->cur_queue->queue_size;
 486
 487             break;
 488
 489         case VIRTIO_STATUS_PORT:
 490             if (length != 1) {
 491                 PrintError("Illegal read length for status\n");
 492                 return -1;
 493             }
 494
 495             *(uint8_t *)dst = vnet_state->virtio_cfg.status;
 496             break;
 497
 498         case VIRTIO_ISR_PORT:
 499             *(uint8_t *)dst = vnet_state->virtio_cfg.pci_isr;
 500             vnet_state->virtio_cfg.pci_isr = 0;
 501             v3_pci_lower_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 502             break;
 503
 504         default:
 505             if ( (port_idx >= sizeof(struct virtio_config)) &&
 506                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct vnet_config))) ) {
 507                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 508                 uint8_t * cfg_ptr = (uint8_t *)&(vnet_state->vnet_cfg);
 509
 510                 memcpy(dst, cfg_ptr + cfg_offset, length);
 511
 512             } else {
 513                 PrintError("Read of Unhandled Virtio Read\n");
 514                 return -1;
 515             }
 516
 517             break;
 518     }
 519
 520     return length;
 521 }
 522
 523
 524
 525 static struct v3_device_ops dev_ops = {
 526     .free = NULL,
 527     .reset = NULL,
 528     .start = NULL,
 529     .stop = NULL,
 530 };
 531
 532
 533 static int dev_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 534     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 535     struct virtio_vnet_state * vnet_state = NULL;
 536     struct pci_device * pci_dev = NULL;
 537     char * name = v3_cfg_val(cfg, "name");
 538
 539     PrintDebug("VNET Bridge: Initializing VNET Bridge Control device: %s\n", name);
 540
 541     if (pci_bus == NULL) {
 542         PrintError("VNET Bridge device require a PCI Bus");
 543         return -1;
 544     }
 545
 546     vnet_state  = (struct virtio_vnet_state *)V3_Malloc(sizeof(struct virtio_vnet_state));
 547     memset(vnet_state, 0, sizeof(struct virtio_vnet_state));
 548
 549     vnet_state->vm = vm;
 550
 551     struct vm_device * dev = v3_allocate_device(name, &dev_ops, vnet_state);
 552
 553     if (v3_attach_device(vm, dev) == -1) {
 554         PrintError("Could not attach device %s\n", name);
 555         return -1;
 556     }
 557
 558
 559     // PCI initialization
 560     {
 561         struct v3_pci_bar bars[6];
 562         int num_ports = sizeof(struct virtio_config) + sizeof(struct vnet_config);
 563         int tmp_ports = num_ports;
 564         int i;
 565
 566         // This gets the number of ports, rounded up to a power of 2
 567         vnet_state->io_range_size = 1; // must be a power of 2
 568
 569         while (tmp_ports > 0) {
 570             tmp_ports >>= 1;
 571             vnet_state->io_range_size <<= 1;
 572         }
 573
 574         // this is to account for any low order bits being set in num_ports
 575         // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 576         if ((num_ports & ((vnet_state->io_range_size >> 1) - 1)) == 0) {
 577             vnet_state->io_range_size >>= 1;
 578         }
 579
 580         for (i = 0; i < 6; i++) {
 581             bars[i].type = PCI_BAR_NONE;
 582         }
 583
 584         bars[0].type = PCI_BAR_IO;
 585         bars[0].default_base_port = -1;
 586         bars[0].num_ports = vnet_state->io_range_size;
 587         bars[0].io_read = virtio_io_read;
 588         bars[0].io_write = virtio_io_write;
 589         bars[0].private_data = vnet_state;
 590
 591         pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
 592                                          0, PCI_AUTO_DEV_NUM, 0,
 593                                          "LNX_VIRTIO_VNET", bars,
 594                                          NULL, NULL, NULL, vnet_state);
 595
 596         if (!pci_dev) {
 597             PrintError("Could not register PCI Device\n");
 598             return -1;
 599         }
 600
 601         pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 602         pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 603         pci_dev->config_header.device_id = VIRTIO_VNET_DEV_ID;
 604         pci_dev->config_header.class = PCI_CLASS_MEMORY;
 605         pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
 606         pci_dev->config_header.subsystem_id = VIRTIO_VNET_SUBDEVICE_ID;
 607         pci_dev->config_header.intr_pin = 1;
 608         pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 609
 610
 611         vnet_state->pci_dev = pci_dev;
 612         vnet_state->pci_bus = pci_bus;
 613     }
 614
 615     virtio_reset(vnet_state);
 616
 617     V3_Print("Registering Virtio device as vnet bridge\n");
 618     v3_vnet_add_bridge(vm, vnet_pkt_input_cb, (void *)vnet_state);
 619
 620     return 0;
 621 }
 622
 623
 624 device_register("LNX_VIRTIO_VNET", dev_init)