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_LINUX_VIRTIO_VNET_DEBUG
  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
  79 struct vnet_virtio_pkt {
  80     uint32_t link_id;
  81     uint32_t pkt_size;
  82     uint8_t pkt[1500];
  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("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("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     PrintDebug("VNET Bridge: RX: pkt sent to guest size: %d\n, pkt_header_len: %d\n", data_len, pkt_head_len);
 227
 228     if (q->ring_avail_addr == 0) {
 229         PrintError("Queue is not set\n");
 230         goto exit;
 231     }
 232
 233
 234     if (q->cur_avail_idx != q->avail->index) {
 235         uint16_t pkt_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 236         struct vring_desc * pkt_desc = NULL;
 237         struct vnet_virtio_pkt * virtio_pkt = NULL;
 238
 239
 240         pkt_desc = &(q->desc[pkt_idx]);
 241         PrintDebug("VNET Bridge RX: buffer desc len: %d\n", pkt_desc->length);
 242
 243         if (guest_pa_to_host_va(&(vm->cores[0]), pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 244             PrintError("Could not translate buffer address\n");
 245             return -1;
 246         }
 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
 254         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 255         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)
 256
 257         q->used->index++;
 258         q->cur_avail_idx++;
 259     } else {
 260         PrintError("Packet buffer overflow in the guest\n");
 261     }
 262
 263     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 264         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 265         vnet_state->virtio_cfg.pci_isr = 0x1;
 266         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 267     }
 268
 269
 270     ret_val = 0;
 271
 272 exit:
 273     v3_unlock_irqrestore(vnet_state->lock, flags);
 274
 275     return ret_val;
 276 }
 277
 278
 279 static int handle_pkt_kick(struct guest_info *core, struct virtio_vnet_state * vnet_state)
 280 {
 281     struct virtio_queue * q = &(vnet_state->queue[XMIT_QUEUE]);
 282
 283     PrintDebug("VNET Bridge Device: Handle TX\n");
 284
 285     while (q->cur_avail_idx != q->avail->index) {
 286         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 287         struct vring_desc * pkt_desc = NULL;
 288         struct vnet_virtio_pkt * virtio_pkt = NULL;
 289
 290         pkt_desc = &(q->desc[desc_idx]);
 291
 292         PrintDebug("VNET Bridge: Handle TX buf_len: %d\n", pkt_desc->length);
 293
 294         if (guest_pa_to_host_va(core, pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 295             PrintError("Could not translate buffer address\n");
 296             return -1;
 297         }
 298
 299         //TODO:  SETUP VNET PACKET data structure
 300
 301         /*
 302           if (v3_vnet_send_pkt(pkt, (void *)core) == -1) {
 303             PrintError("Error sending packet to vnet\n");
 304             return -1;
 305         }
 306         */
 307         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 308         q->used->ring[q->used->index % q->queue_size].length = pkt_desc->length; // What do we set this to????
 309         q->used->index++;
 310
 311         q->cur_avail_idx++;
 312     }
 313
 314     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 315         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 316         vnet_state->virtio_cfg.pci_isr = 0x1;
 317     }
 318
 319 #ifdef CONFIG_VNET_PROFILE
 320     uint64_t time;
 321     rdtscll(time);
 322     core->vnet_times.total_handle_time = time - core->vnet_times.virtio_handle_start;
 323     core->vnet_times.print = true;
 324 #endif
 325
 326     return 0;
 327 }
 328
 329 static int virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
 330     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 331     int port_idx = port % vnet_state->io_range_size;
 332
 333
 334     PrintDebug("VNET Bridge: VIRTIO VNET Write for port %d len=%d, value=%x\n",
 335                port, length, *(uint32_t *)src);
 336     PrintDebug("VNET Bridge: port idx=%d\n", port_idx);
 337
 338
 339     switch (port_idx) {
 340         case GUEST_FEATURES_PORT:
 341             if (length != 4) {
 342                 PrintError("Illegal write length for guest features\n");
 343                 return -1;
 344             }
 345             vnet_state->virtio_cfg.guest_features = *(uint32_t *)src;
 346
 347             break;
 348         case VRING_PG_NUM_PORT:
 349             if (length == 4) {
 350                 addr_t pfn = *(uint32_t *)src;
 351                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 352
 353                 vnet_state->cur_queue->pfn = pfn;
 354
 355                 vnet_state->cur_queue->ring_desc_addr = page_addr ;
 356                 vnet_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 357                 vnet_state->cur_queue->ring_used_addr = ( vnet_state->cur_queue->ring_avail_addr + \
 358                                                  sizeof(struct vring_avail)    + \
 359                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 360
 361                 // round up to next page boundary.
 362                 vnet_state->cur_queue->ring_used_addr = (vnet_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
 363
 364                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_desc_addr, (addr_t *)&(vnet_state->cur_queue->desc)) == -1) {
 365                     PrintError("Could not translate ring descriptor address\n");
 366                     return -1;
 367                 }
 368
 369                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_avail_addr, (addr_t *)&(vnet_state->cur_queue->avail)) == -1) {
 370                     PrintError("Could not translate ring available address\n");
 371                     return -1;
 372                 }
 373
 374                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_used_addr, (addr_t *)&(vnet_state->cur_queue->used)) == -1) {
 375                     PrintError("Could not translate ring used address\n");
 376                     return -1;
 377                 }
 378
 379                 PrintDebug("VNET Bridge: RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 380                            (void *)(vnet_state->cur_queue->ring_desc_addr),
 381                            (void *)(vnet_state->cur_queue->ring_avail_addr),
 382                            (void *)(vnet_state->cur_queue->ring_used_addr));
 383
 384                 PrintDebug("VNET Bridge: RingDesc=%p, Avail=%p, Used=%p\n",
 385                            vnet_state->cur_queue->desc, vnet_state->cur_queue->avail, vnet_state->cur_queue->used);
 386
 387             } else {
 388                 PrintError("Illegal write length for page frame number\n");
 389                 return -1;
 390             }
 391             break;
 392         case VRING_Q_SEL_PORT:
 393             vnet_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 394
 395             if (vnet_state->virtio_cfg.vring_queue_selector > NUM_QUEUES) {
 396                 PrintError("VNET Bridge device has no qeueues. Selected %d\n",
 397                            vnet_state->virtio_cfg.vring_queue_selector);
 398                 return -1;
 399             }
 400
 401             vnet_state->cur_queue = &(vnet_state->queue[vnet_state->virtio_cfg.vring_queue_selector]);
 402
 403             break;
 404         case VRING_Q_NOTIFY_PORT: {
 405             uint16_t queue_idx = *(uint16_t *)src;
 406
 407             PrintDebug("VNET Bridge: Handling Kick\n");
 408
 409             if (queue_idx == 0) {
 410                 if (handle_cmd_kick(core, vnet_state) == -1) {
 411                     PrintError("Could not handle Virtio VNET Control command\n");
 412                     return -1;
 413                 }
 414             } else if (queue_idx == 1) {
 415                 if (handle_pkt_kick(core, vnet_state) == -1){
 416                     PrintError("Could not handle Virtio VNET TX\n");
 417                     return -1;
 418                 }
 419             } else if (queue_idx == 2) {
 420                 PrintDebug("VNET Bridge: receive kick on RX Queue\n");
 421             } else {
 422                 PrintError("VNET Bridge: Kick on invalid queue (%d)\n", queue_idx);
 423                 return -1;
 424             }
 425
 426             break;
 427         }
 428         case VIRTIO_STATUS_PORT:
 429             vnet_state->virtio_cfg.status = *(uint8_t *)src;
 430
 431             if (vnet_state->virtio_cfg.status == 0) {
 432                 PrintDebug("VNET Bridge: Resetting device\n");
 433                 virtio_reset(vnet_state);
 434             }
 435
 436             break;
 437
 438         case VIRTIO_ISR_PORT:
 439             vnet_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 440             break;
 441         default:
 442             return -1;
 443             break;
 444     }
 445
 446     return length;
 447 }
 448
 449
 450 static int virtio_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
 451
 452     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 453     int port_idx = port % vnet_state->io_range_size;
 454
 455 /*
 456     PrintDebug("VirtioVNET: VIRTIO SYMBIOTIC Read  for port %d (index =%d), length=%d\n",
 457                port, port_idx, length);
 458 */
 459     switch (port_idx) {
 460         case HOST_FEATURES_PORT:
 461             if (length != 4) {
 462                 PrintError("Illegal read length for host features\n");
 463                 return -1;
 464             }
 465
 466             *(uint32_t *)dst = vnet_state->virtio_cfg.host_features;
 467
 468             break;
 469         case VRING_PG_NUM_PORT:
 470             if (length != 4) {
 471                 PrintError("Illegal read length for page frame number\n");
 472                 return -1;
 473             }
 474
 475             *(uint32_t *)dst = vnet_state->cur_queue->pfn;
 476
 477             break;
 478         case VRING_SIZE_PORT:
 479             if (length != 2) {
 480                 PrintError("Illegal read length for vring size\n");
 481                 return -1;
 482             }
 483
 484             *(uint16_t *)dst = vnet_state->cur_queue->queue_size;
 485
 486             break;
 487
 488         case VIRTIO_STATUS_PORT:
 489             if (length != 1) {
 490                 PrintError("Illegal read length for status\n");
 491                 return -1;
 492             }
 493
 494             *(uint8_t *)dst = vnet_state->virtio_cfg.status;
 495             break;
 496
 497         case VIRTIO_ISR_PORT:
 498             *(uint8_t *)dst = vnet_state->virtio_cfg.pci_isr;
 499             vnet_state->virtio_cfg.pci_isr = 0;
 500             v3_pci_lower_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 501             break;
 502
 503         default:
 504             if ( (port_idx >= sizeof(struct virtio_config)) &&
 505                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct vnet_config))) ) {
 506                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 507                 uint8_t * cfg_ptr = (uint8_t *)&(vnet_state->vnet_cfg);
 508
 509                 memcpy(dst, cfg_ptr + cfg_offset, length);
 510
 511             } else {
 512                 PrintError("Read of Unhandled Virtio Read\n");
 513                 return -1;
 514             }
 515
 516             break;
 517     }
 518
 519     return length;
 520 }
 521
 522
 523
 524 static struct v3_device_ops dev_ops = {
 525     .free = NULL,
 526     .reset = NULL,
 527     .start = NULL,
 528     .stop = NULL,
 529 };
 530
 531
 532 static int dev_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 533     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 534     struct virtio_vnet_state * vnet_state = NULL;
 535     struct pci_device * pci_dev = NULL;
 536     char * name = v3_cfg_val(cfg, "name");
 537
 538     PrintDebug("VNET Bridge: Initializing VNET Bridge Control device: %s\n", name);
 539
 540     if (pci_bus == NULL) {
 541         PrintError("VNET Bridge device require a PCI Bus");
 542         return -1;
 543     }
 544
 545     vnet_state  = (struct virtio_vnet_state *)V3_Malloc(sizeof(struct virtio_vnet_state));
 546     memset(vnet_state, 0, sizeof(struct virtio_vnet_state));
 547
 548     vnet_state->vm = vm;
 549
 550     struct vm_device * dev = v3_allocate_device(name, &dev_ops, vnet_state);
 551
 552     if (v3_attach_device(vm, dev) == -1) {
 553         PrintError("Could not attach device %s\n", name);
 554         return -1;
 555     }
 556
 557
 558     // PCI initialization
 559     {
 560         struct v3_pci_bar bars[6];
 561         int num_ports = sizeof(struct virtio_config) + sizeof(struct vnet_config);
 562         int tmp_ports = num_ports;
 563         int i;
 564
 565         // This gets the number of ports, rounded up to a power of 2
 566         vnet_state->io_range_size = 1; // must be a power of 2
 567
 568         while (tmp_ports > 0) {
 569             tmp_ports >>= 1;
 570             vnet_state->io_range_size <<= 1;
 571         }
 572
 573         // this is to account for any low order bits being set in num_ports
 574         // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 575         if ((num_ports & ((vnet_state->io_range_size >> 1) - 1)) == 0) {
 576             vnet_state->io_range_size >>= 1;
 577         }
 578
 579         for (i = 0; i < 6; i++) {
 580             bars[i].type = PCI_BAR_NONE;
 581         }
 582
 583         bars[0].type = PCI_BAR_IO;
 584         bars[0].default_base_port = -1;
 585         bars[0].num_ports = vnet_state->io_range_size;
 586         bars[0].io_read = virtio_io_read;
 587         bars[0].io_write = virtio_io_write;
 588         bars[0].private_data = vnet_state;
 589
 590         pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
 591                                          0, PCI_AUTO_DEV_NUM, 0,
 592                                          "LNX_VIRTIO_VNET", bars,
 593                                          NULL, NULL, NULL, vnet_state);
 594
 595         if (!pci_dev) {
 596             PrintError("Could not register PCI Device\n");
 597             return -1;
 598         }
 599
 600         pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
 601         pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
 602         pci_dev->config_header.device_id = VIRTIO_VNET_DEV_ID;
 603         pci_dev->config_header.class = PCI_CLASS_MEMORY;
 604         pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
 605         pci_dev->config_header.subsystem_id = VIRTIO_VNET_SUBDEVICE_ID;
 606         pci_dev->config_header.intr_pin = 1;
 607         pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 608
 609
 610         vnet_state->pci_dev = pci_dev;
 611         vnet_state->pci_bus = pci_bus;
 612     }
 613
 614     virtio_reset(vnet_state);
 615
 616     v3_vnet_add_bridge(vm, vnet_pkt_input_cb, (void *)vnet_state);
 617
 618     return 0;
 619 }
 620
 621
 622 device_register("LNX_VIRTIO_VNET", dev_init)