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 struct vnet_virtio_pkt {
  79     uint32_t link_id;
  80     uint32_t pkt_size;
  81     uint8_t pkt[1500];
  82 };
  83
  84 static int virtio_reset(struct virtio_vnet_state * vnet_state) {
  85
  86     memset(vnet_state->queue, 0, sizeof(struct virtio_queue) * 2);
  87
  88     vnet_state->cur_queue = &(vnet_state->queue[0]);
  89
  90     vnet_state->virtio_cfg.status = 0;
  91     vnet_state->virtio_cfg.pci_isr = 0;
  92
  93     vnet_state->queue[0].queue_size = QUEUE_SIZE;
  94     vnet_state->queue[1].queue_size = QUEUE_SIZE;
  95     vnet_state->queue[2].queue_size = QUEUE_SIZE;
  96
  97     memset(&(vnet_state->vnet_cfg), 0, sizeof(struct vnet_config));
  98     v3_lock_init(&(vnet_state->lock));
  99
 100     return 0;
 101 }
 102
 103
 104
 105 static int get_desc_count(struct virtio_queue * q, int index) {
 106     struct vring_desc * tmp_desc = &(q->desc[index]);
 107     int cnt = 1;
 108
 109     while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
 110         tmp_desc = &(q->desc[tmp_desc->next]);
 111         cnt++;
 112     }
 113
 114     return cnt;
 115 }
 116
 117
 118
 119
 120 static int handle_cmd_kick(struct guest_info * core, struct virtio_vnet_state * vnet_state) {
 121     struct virtio_queue * q = &(vnet_state->queue[0]);
 122
 123     PrintDebug("VNET Bridge: Handling command  queue\n");
 124
 125     while (q->cur_avail_idx != q->avail->index) {
 126         struct vring_desc * hdr_desc = NULL;
 127         struct vring_desc * buf_desc = NULL;
 128         struct vring_desc * status_desc = NULL;
 129         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 130         uint16_t desc_cnt = get_desc_count(q, desc_idx);
 131         struct vnet_ctrl_hdr * hdr = NULL;
 132         int i;
 133         int xfer_len = 0;
 134         uint8_t * status_ptr = NULL;
 135         uint8_t status = 0;
 136
 137
 138         PrintDebug("VNET Bridge: CMD: Descriptor Count=%d, index=%d, desc_idx=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE, desc_idx);
 139
 140         if (desc_cnt < 3) {
 141             PrintError("VNET Bridge cmd must include at least 3 descriptors (cnt=%d)\n", desc_cnt);
 142             return -1;
 143         }
 144
 145         hdr_desc = &(q->desc[desc_idx]);
 146
 147         if (guest_pa_to_host_va(core, hdr_desc->addr_gpa, (addr_t *)&hdr) == -1) {
 148             PrintError("Could not translate VirtioVNET header address\n");
 149             return -1;
 150         }
 151
 152         desc_idx = hdr_desc->next;
 153
 154         if (hdr->cmd_type == VNET_ADD_ROUTE) {
 155
 156             for (i = 0; i < hdr->num_cmds; i++) {
 157                 uint8_t tmp_status = 0;
 158                 struct v3_vnet_route * route = NULL;
 159
 160                 buf_desc = &(q->desc[desc_idx]);
 161
 162                 if (guest_pa_to_host_va(core, buf_desc->addr_gpa, (addr_t *)&(route)) == -1) {
 163                     PrintError("Could not translate route address\n");
 164                     return -1;
 165                 }
 166
 167                 // add route
 168                 PrintDebug("VNET Bridge: Adding VNET Route\n");
 169
 170                 tmp_status = v3_vnet_add_route(*route);
 171
 172                 PrintDebug("VNET Route Added\n");
 173
 174                 if (tmp_status != 0) {
 175                     PrintError("Error adding VNET ROUTE\n");
 176                     status = tmp_status;
 177                 }
 178
 179                 xfer_len += buf_desc->length;
 180                 desc_idx = buf_desc->next;
 181             }
 182
 183         }
 184
 185
 186
 187         status_desc = &(q->desc[desc_idx]);
 188
 189         if (guest_pa_to_host_va(core, status_desc->addr_gpa, (addr_t *)&status_ptr) == -1) {
 190             PrintError("VirtioVNET Error could not translate status address\n");
 191             return -1;
 192         }
 193
 194         xfer_len += status_desc->length;
 195         *status_ptr = status;
 196
 197         PrintDebug("Transferred %d bytes (xfer_len)\n", xfer_len);
 198         q->used->ring[q->used->index % QUEUE_SIZE].id = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
 199         q->used->ring[q->used->index % QUEUE_SIZE].length = xfer_len; // set to total inbound xfer length
 200
 201         q->used->index++;
 202         q->cur_avail_idx++;
 203     }
 204
 205
 206     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 207         PrintDebug("Raising IRQ %d\n",  vnet_state->pci_dev->config_header.intr_line);
 208         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 209         vnet_state->virtio_cfg.pci_isr = 1;
 210     }
 211
 212
 213     return 0;
 214 }
 215
 216
 217 static int vnet_pkt_input_cb(struct v3_vm_info * vm,  struct v3_vnet_pkt * pkt,  void * private_data){
 218     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 219     struct virtio_queue * q = &(vnet_state->queue[RECV_QUEUE]);
 220     int ret_val = -1;
 221     unsigned long flags;
 222
 223     flags = v3_lock_irqsave(vnet_state->lock);
 224
 225     PrintDebug("VNET Bridge: RX: pkt sent to guest size: %d\n, pkt_header_len: %d\n", data_len, pkt_head_len);
 226
 227     if (q->ring_avail_addr == 0) {
 228         PrintError("Queue is not set\n");
 229         goto exit;
 230     }
 231
 232
 233     if (q->cur_avail_idx != q->avail->index) {
 234         uint16_t pkt_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 235         struct vring_desc * pkt_desc = NULL;
 236         struct vnet_virtio_pkt * virtio_pkt = NULL;
 237
 238
 239         pkt_desc = &(q->desc[pkt_idx]);
 240         PrintDebug("VNET Bridge RX: buffer desc len: %d\n", pkt_desc->length);
 241
 242         if (guest_pa_to_host_va(&(vm->cores[0]), pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 243             PrintError("Could not translate buffer address\n");
 244             return -1;
 245         }
 246
 247         // Fill in dst packet buffer
 248         virtio_pkt->link_id = pkt->dst_id;
 249         virtio_pkt->pkt_size = pkt->size;
 250         memcpy(virtio_pkt->pkt, pkt->data, pkt->size);
 251
 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\n");
 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
 269     ret_val = 0;
 270
 271 exit:
 272     v3_unlock_irqrestore(vnet_state->lock, flags);
 273
 274     return ret_val;
 275 }
 276
 277
 278 static int handle_pkt_kick(struct guest_info *core, struct virtio_vnet_state * vnet_state)
 279 {
 280     struct virtio_queue * q = &(vnet_state->queue[XMIT_QUEUE]);
 281
 282     PrintDebug("VNET Bridge Device: Handle TX\n");
 283
 284     while (q->cur_avail_idx != q->avail->index) {
 285         uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
 286         struct vring_desc * pkt_desc = NULL;
 287         struct vnet_virtio_pkt * virtio_pkt = NULL;
 288
 289         pkt_desc = &(q->desc[desc_idx]);
 290
 291         PrintDebug("VNET Bridge: Handle TX buf_len: %d\n", pkt_desc->length);
 292
 293         if (guest_pa_to_host_va(core, pkt_desc->addr_gpa, (addr_t *)&(virtio_pkt)) == -1) {
 294             PrintError("Could not translate buffer address\n");
 295             return -1;
 296         }
 297
 298         //TODO:  SETUP VNET PACKET data structure
 299
 300         /*
 301           if (v3_vnet_send_pkt(pkt, (void *)core) == -1) {
 302             PrintError("Error sending packet to vnet\n");
 303             return -1;
 304         }
 305         */
 306         q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
 307         q->used->ring[q->used->index % q->queue_size].length = pkt_desc->length; // What do we set this to????
 308         q->used->index++;
 309
 310         q->cur_avail_idx++;
 311     }
 312
 313     if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
 314         v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 315         vnet_state->virtio_cfg.pci_isr = 0x1;
 316     }
 317
 318 #ifdef CONFIG_VNET_PROFILE
 319     uint64_t time;
 320     rdtscll(time);
 321     core->vnet_times.total_handle_time = time - core->vnet_times.virtio_handle_start;
 322     core->vnet_times.print = true;
 323 #endif
 324
 325     return 0;
 326 }
 327
 328 static int virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
 329     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 330     int port_idx = port % vnet_state->io_range_size;
 331
 332     PrintDebug("VNET Bridge: VIRTIO VNET Write for port %d len=%d, value=%x\n",
 333                port, length, *(uint32_t *)src);
 334     PrintDebug("VNET Bridge: port idx=%d\n", port_idx);
 335
 336
 337     switch (port_idx) {
 338         case GUEST_FEATURES_PORT:
 339             if (length != 4) {
 340                 PrintError("Illegal write length for guest features\n");
 341                 return -1;
 342             }
 343             vnet_state->virtio_cfg.guest_features = *(uint32_t *)src;
 344
 345             break;
 346         case VRING_PG_NUM_PORT:
 347             if (length == 4) {
 348                 addr_t pfn = *(uint32_t *)src;
 349                 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
 350
 351                 vnet_state->cur_queue->pfn = pfn;
 352
 353                 vnet_state->cur_queue->ring_desc_addr = page_addr ;
 354                 vnet_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
 355                 vnet_state->cur_queue->ring_used_addr = ( vnet_state->cur_queue->ring_avail_addr + \
 356                                                  sizeof(struct vring_avail)    + \
 357                                                  (QUEUE_SIZE * sizeof(uint16_t)));
 358
 359                 // round up to next page boundary.
 360                 vnet_state->cur_queue->ring_used_addr = (vnet_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
 361
 362                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_desc_addr, (addr_t *)&(vnet_state->cur_queue->desc)) == -1) {
 363                     PrintError("Could not translate ring descriptor address\n");
 364                     return -1;
 365                 }
 366
 367                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_avail_addr, (addr_t *)&(vnet_state->cur_queue->avail)) == -1) {
 368                     PrintError("Could not translate ring available address\n");
 369                     return -1;
 370                 }
 371
 372                 if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_used_addr, (addr_t *)&(vnet_state->cur_queue->used)) == -1) {
 373                     PrintError("Could not translate ring used address\n");
 374                     return -1;
 375                 }
 376
 377                 PrintDebug("VNET Bridge: RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
 378                            (void *)(vnet_state->cur_queue->ring_desc_addr),
 379                            (void *)(vnet_state->cur_queue->ring_avail_addr),
 380                            (void *)(vnet_state->cur_queue->ring_used_addr));
 381
 382                 PrintDebug("VNET Bridge: RingDesc=%p, Avail=%p, Used=%p\n",
 383                            vnet_state->cur_queue->desc, vnet_state->cur_queue->avail, vnet_state->cur_queue->used);
 384
 385             } else {
 386                 PrintError("Illegal write length for page frame number\n");
 387                 return -1;
 388             }
 389             break;
 390         case VRING_Q_SEL_PORT:
 391             vnet_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
 392
 393             if (vnet_state->virtio_cfg.vring_queue_selector > NUM_QUEUES) {
 394                 PrintError("VNET Bridge device has no qeueues. Selected %d\n",
 395                            vnet_state->virtio_cfg.vring_queue_selector);
 396                 return -1;
 397             }
 398
 399             vnet_state->cur_queue = &(vnet_state->queue[vnet_state->virtio_cfg.vring_queue_selector]);
 400
 401             break;
 402         case VRING_Q_NOTIFY_PORT: {
 403             uint16_t queue_idx = *(uint16_t *)src;
 404
 405             PrintDebug("VNET Bridge: Handling Kick\n");
 406
 407             if (queue_idx == 0) {
 408                 if (handle_cmd_kick(core, vnet_state) == -1) {
 409                     PrintError("Could not handle Virtio VNET Control command\n");
 410                     return -1;
 411                 }
 412             } else if (queue_idx == 1) {
 413                 if (handle_pkt_kick(core, vnet_state) == -1){
 414                     PrintError("Could not handle Virtio VNET TX\n");
 415                     return -1;
 416                 }
 417             } else if (queue_idx == 2) {
 418                 PrintDebug("VNET Bridge: receive kick on RX Queue\n");
 419             } else {
 420                 PrintError("VNET Bridge: Kick on invalid queue (%d)\n", queue_idx);
 421                 return -1;
 422             }
 423
 424             break;
 425         }
 426         case VIRTIO_STATUS_PORT:
 427             vnet_state->virtio_cfg.status = *(uint8_t *)src;
 428
 429             if (vnet_state->virtio_cfg.status == 0) {
 430                 PrintDebug("VNET Bridge: Resetting device\n");
 431                 virtio_reset(vnet_state);
 432             }
 433
 434             break;
 435
 436         case VIRTIO_ISR_PORT:
 437             vnet_state->virtio_cfg.pci_isr = *(uint8_t *)src;
 438             break;
 439         default:
 440             return -1;
 441             break;
 442     }
 443
 444     return length;
 445 }
 446
 447
 448 static int vnetbrg_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
 449
 450     struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
 451     int port_idx = port % vnet_state->io_range_size;
 452
 453 /*
 454     PrintDebug("VirtioVNET: VIRTIO SYMBIOTIC Read  for port %d (index =%d), length=%d\n",
 455                port, port_idx, length);
 456 */
 457     switch (port_idx) {
 458         case HOST_FEATURES_PORT:
 459             if (length != 4) {
 460                 PrintError("Illegal read length for host features\n");
 461                 return -1;
 462             }
 463
 464             *(uint32_t *)dst = vnet_state->virtio_cfg.host_features;
 465
 466             break;
 467         case VRING_PG_NUM_PORT:
 468             if (length != 4) {
 469                 PrintError("Illegal read length for page frame number\n");
 470                 return -1;
 471             }
 472
 473             *(uint32_t *)dst = vnet_state->cur_queue->pfn;
 474
 475             break;
 476         case VRING_SIZE_PORT:
 477             if (length != 2) {
 478                 PrintError("Illegal read length for vring size\n");
 479                 return -1;
 480             }
 481
 482             *(uint16_t *)dst = vnet_state->cur_queue->queue_size;
 483
 484             break;
 485
 486         case VIRTIO_STATUS_PORT:
 487             if (length != 1) {
 488                 PrintError("Illegal read length for status\n");
 489                 return -1;
 490             }
 491
 492             *(uint8_t *)dst = vnet_state->virtio_cfg.status;
 493             break;
 494
 495         case VIRTIO_ISR_PORT:
 496             *(uint8_t *)dst = vnet_state->virtio_cfg.pci_isr;
 497             vnet_state->virtio_cfg.pci_isr = 0;
 498             v3_pci_lower_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
 499             break;
 500
 501         default:
 502             if ( (port_idx >= sizeof(struct virtio_config)) &&
 503                  (port_idx < (sizeof(struct virtio_config) + sizeof(struct vnet_config))) ) {
 504                 int cfg_offset = port_idx - sizeof(struct virtio_config);
 505                 uint8_t * cfg_ptr = (uint8_t *)&(vnet_state->vnet_cfg);
 506
 507                 memcpy(dst, cfg_ptr + cfg_offset, length);
 508
 509             } else {
 510                 PrintError("Read of Unhandled Virtio Read\n");
 511                 return -1;
 512             }
 513
 514             break;
 515     }
 516
 517     return length;
 518 }
 519
 520
 521
 522 static struct v3_device_ops dev_ops = {
 523     .free = NULL,
 524     .reset = NULL,
 525     .start = NULL,
 526     .stop = NULL,
 527 };
 528
 529
 530 static int dev_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 531     struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
 532     struct virtio_vnet_state * vnet_state = NULL;
 533     struct pci_device * pci_dev = NULL;
 534     char * name = v3_cfg_val(cfg, "name");
 535
 536     PrintDebug("VNET Bridge: Initializing VNET Bridge Control device: %s\n", name);
 537
 538     if (pci_bus == NULL) {
 539         PrintError("VNET Bridge device require a PCI Bus");
 540         return -1;
 541     }
 542
 543     vnet_state  = (struct virtio_vnet_state *)V3_Malloc(sizeof(struct virtio_vnet_state));
 544     memset(vnet_state, 0, sizeof(struct virtio_vnet_state));
 545
 546     vnet_state->vm = vm;
 547
 548     struct vm_device * dev = v3_allocate_device(name, &dev_ops, vnet_state);
 549
 550     if (v3_attach_device(vm, dev) == -1) {
 551         PrintError("Could not attach device %s\n", name);
 552         return -1;
 553     }
 554
 555
 556     // PCI initialization
 557     {
 558         struct v3_pci_bar bars[6];
 559         int num_ports = sizeof(struct virtio_config) + sizeof(struct vnet_config);
 560         int tmp_ports = num_ports;
 561         int i;
 562
 563         // This gets the number of ports, rounded up to a power of 2
 564         vnet_state->io_range_size = 1; // must be a power of 2
 565
 566         while (tmp_ports > 0) {
 567             tmp_ports >>= 1;
 568             vnet_state->io_range_size <<= 1;
 569         }
 570
 571         // this is to account for any low order bits being set in num_ports
 572         // if there are none, then num_ports was already a power of 2 so we shift right to reset it
 573         if ((num_ports & ((vnet_state->io_range_size >> 1) - 1)) == 0) {
 574             vnet_state->io_range_size >>= 1;
 575         }
 576
 577         for (i = 0; i < 6; i++) {
 578             bars[i].type = PCI_BAR_NONE;
 579         }
 580
 581         bars[0].type = PCI_BAR_IO;
 582         bars[0].default_base_port = -1;
 583         bars[0].num_ports = vnet_state->io_range_size;
 584         bars[0].io_read = virtio_io_read;
 585         bars[0].io_write = virtio_io_write;
 586         bars[0].private_data = vnet_state;
 587
 588         pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
 589                                          0, PCI_AUTO_DEV_NUM, 0,
 590                                          "LNX_VIRTIO_VNET", bars,
 591                                          NULL, NULL, NULL, vnet_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         pci_dev->config_header.device_id = VIRTIO_VNET_DEV_ID;
 601         pci_dev->config_header.class = PCI_CLASS_MEMORY;
 602         pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
 603         pci_dev->config_header.subsystem_id = VIRTIO_VNET_SUBDEVICE_ID;
 604         pci_dev->config_header.intr_pin = 1;
 605         pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
 606
 607
 608         vnet_state->pci_dev = pci_dev;
 609         vnet_state->pci_bus = pci_bus;
 610     }
 611
 612     virtio_reset(vnet_state);
 613
 614     V3_Print("Registering Virtio device as vnet bridge\n");
 615     v3_vnet_add_bridge(vm, vnet_pkt_input_cb, (void *)vnet_state);
 616
 617     return 0;
 618 }
 619
 620
 621 device_register("LNX_VIRTIO_VNET", dev_init)