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.
6 * The V3VEE Project is a joint project between Northwestern University
7 * and the University of New Mexico. You can find out more at
10 * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
11 * Copyright (c) 2008, Lei Xia <lxia@northwestern.edu>
12 * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
13 * All rights reserved.
15 * Author: Jack Lange <jarusl@cs.northwestern.edu>
16 * Lei Xia <lxia@northwestern.edu>
19 * This is free software. You are permitted to use,
20 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
23 #include <palacios/vmm.h>
24 #include <palacios/vmm_dev_mgr.h>
25 #include <devices/lnx_virtio_pci.h>
26 #include <palacios/vm_guest_mem.h>
27 #include <palacios/vmm_sprintf.h>
29 #include <devices/pci.h>
32 #ifndef CONFIG_DEBUG_VIRTIO_BLK
34 #define PrintDebug(fmt, args...)
37 /* The feature bitmap for virtio net */
38 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
39 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
40 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
41 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
42 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
43 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
44 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
45 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
46 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
47 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
48 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
49 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
50 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
51 #define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
52 #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */
53 #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */
54 #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */
55 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */
56 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
58 /* Maximum packet size we can receive from tap device: header + 64k */
59 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
62 struct virtio_net_hdr {
65 #define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */
68 uint16_t hdr_len; /* Ethernet + IP + tcp/udp hdrs */
69 uint16_t gso_size; /* Bytes to append to hdr_len per frame */
70 uint16_t csum_start; /* Position to start checksumming from */
71 uint16_t csum_offset; /* Offset after that to place checksum */
72 }__attribute__((packed));
77 #define QUEUE_SIZE 256
78 #define CTRL_QUEUE_SIZE 64
82 struct virtio_net_config
84 uint8_t mac[ETH_ALEN];
85 // See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above
87 } __attribute__((packed));
89 struct virtio_dev_state {
90 struct vm_device * pci_bus;
91 struct list_head dev_list;
92 struct guest_info * vm;
95 struct virtio_net_state {
96 struct virtio_net_config net_cfg;
97 struct virtio_config virtio_cfg;
99 //struct vm_device * pci_bus;
100 struct pci_device * pci_dev;
102 struct virtio_queue rx_vq; //index 0, rvq in Linux virtio driver, handle packet to guest
103 struct virtio_queue tx_vq; //index 1, svq in Linux virtio driver, handle packet from guest
104 struct virtio_queue ctrl_vq; //index 2, ctrol info from guest
106 struct v3_dev_net_ops * net_ops;
110 struct virtio_dev_state * virtio_dev;
112 struct list_head dev_link;
120 //Temporarly for debug
121 static void print_packet(uchar_t *pkt, int size) {
122 PrintDebug("Vnet: print_data_packet: size: %d\n", size);
123 v3_hexdump(pkt, size, NULL, 0);
126 static int send (uchar_t *buf, uint_t len)
128 print_packet(buf, len);
134 static int virtio_free(struct vm_device * dev)
140 static int virtio_reset(struct virtio_net_state * virtio)
142 virtio->rx_vq.ring_desc_addr = 0;
143 virtio->rx_vq.ring_avail_addr = 0;
144 virtio->rx_vq.ring_used_addr = 0;
145 virtio->rx_vq.pfn = 0;
146 virtio->rx_vq.cur_avail_idx = 0;
148 virtio->tx_vq.ring_desc_addr = 0;
149 virtio->tx_vq.ring_avail_addr = 0;
150 virtio->tx_vq.ring_used_addr = 0;
151 virtio->tx_vq.pfn = 0;
152 virtio->tx_vq.cur_avail_idx = 0;
154 virtio->ctrl_vq.ring_desc_addr = 0;
155 virtio->ctrl_vq.ring_avail_addr = 0;
156 virtio->ctrl_vq.ring_used_addr = 0;
157 virtio->ctrl_vq.pfn = 0;
158 virtio->ctrl_vq.cur_avail_idx = 0;
160 virtio->virtio_cfg.status = VIRTIO_NET_S_LINK_UP;
161 virtio->virtio_cfg.pci_isr = 0;
162 virtio->private_data = NULL;
168 //sending guest's packet to network sink
169 static int pkt_write(struct vm_device *dev, struct vring_desc *buf_desc)
171 struct virtio_net_state * virtio = (struct virtio_net_state *)dev->private_data;
173 uint32_t len = buf_desc->length;
175 PrintDebug("Handling Virtio Net write\n");
177 if (guest_pa_to_host_va(dev->vm, buf_desc->addr_gpa, (addr_t *)&(buf)) == -1) {
178 PrintError("Could not translate buffer address\n");
182 PrintDebug("Length=%d\n", buf_desc->length);
184 if (virtio->net_ops->send(buf, len, virtio->private_data, NULL) == -1) {
192 static int build_receive_header(struct virtio_net_hdr *hdr, const void *buf, int raw)
197 memcpy(hdr, buf, sizeof(struct virtio_net_hdr));
199 memset(hdr, 0, sizeof(struct virtio_net_hdr));
206 //sending guest's packet to network sink
207 static int copy_data_to_desc(struct vm_device * dev, struct vring_desc *desc, uchar_t *buf, uint_t buf_len)
210 uint8_t *desc_buf = NULL;
212 if (guest_pa_to_host_va(dev->vm, desc->addr_gpa, (addr_t *)&(desc_buf)) == -1) {
213 PrintError("Could not translate buffer address\n");
217 len = (desc->length < buf_len)?desc->length:buf_len;
219 memcpy(desc_buf, buf, len);
221 PrintDebug("Length=%d\n", len);
228 static int send_pkt_to_guest(struct vm_device * dev, uchar_t *buf, uint_t size, int raw, void *private_data)
230 struct virtio_net_state *virtio = (struct virtio_net_state *)dev->private_data;
231 struct virtio_queue *q = &(virtio->rx_vq);
233 PrintDebug("VIRTIO Handle RX: cur_index=%d (mod=%d), avail_index=%d\n",
234 q->cur_avail_idx, q->cur_avail_idx % q->queue_size, q->avail->index);
236 struct virtio_net_hdr hdr;
237 uint32_t hdr_len = sizeof(struct virtio_net_hdr);
239 uint32_t data_len = size;
243 build_receive_header(&hdr, buf, 1);
245 //queue is not set yet
246 if (q->ring_avail_addr == 0)
249 \r uint32_t offset = 0;
250 if (q->cur_avail_idx < q->avail->index) {
251 struct vring_desc * hdr_desc = NULL;
253 uint16_t hdr_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
255 PrintDebug("Descriptor Count=%d, index=%d\n", desc_cnt, q->cur_avail_idx % q->queue_size);
257 hdr_desc = &(q->desc[hdr_idx]);
259 PrintDebug("Header Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", hdr_desc,
260 (void *)(hdr_desc->addr_gpa), hdr_desc->length, hdr_desc->flags, hdr_desc->next);
262 if (guest_pa_to_host_va(dev->vm, hdr_desc->addr_gpa, &(hdr_addr)) == -1) {
263 PrintError("Could not translate receive buffer address\n");
267 //copy header to the header descriptor
268 memcpy((void *)hdr_addr, &hdr, sizeof(struct virtio_net_hdr));
270 uint16_t buf_idx = 0;
271 struct vring_desc * buf_desc = NULL;
272 //copy data to the next descriptors
273 for (buf_idx = 0; offset < data_len; buf_idx = q->desc[hdr_idx].next) {
274 q->desc[buf_idx].flags = VIRTIO_NEXT_FLAG;
275 buf_desc = &(q->desc[buf_idx]);
276 uint32_t len = copy_data_to_desc(dev, buf_desc, buf+offset, data_len - offset);
278 buf_desc->length = len; // TODO: do we need this?
281 q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
282 q->used->ring[q->used->index % q->queue_size].length = data_len; // What do we set this to????
288 if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
289 PrintDebug("Raising IRQ %d\n", virtio->pci_dev->config_header.intr_line);
290 v3_pci_raise_irq(virtio->virtio_dev->pci_bus, 0, virtio->pci_dev);
291 virtio->virtio_cfg.pci_isr = 0x1;
298 int virtio_send(struct vm_device * dev, uchar_t *buf, uint_t size)
300 return send_pkt_to_guest(dev, buf, size, 1, NULL);
304 static int get_desc_count(struct virtio_queue * q, int index)
306 struct vring_desc * tmp_desc = &(q->desc[index]);
309 while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
310 tmp_desc = &(q->desc[tmp_desc->next]);
318 static int handle_ctrl(struct vm_device * dev)
325 //get packet from guest
326 static int handle_pkt_tx(struct vm_device * dev)
328 struct virtio_net_state *virtio = (struct virtio_net_state *)dev->private_data;
329 struct virtio_queue *q = &(virtio->tx_vq);
331 PrintDebug("VIRTIO NIC pkt_tx: cur_index=%d (mod=%d), avail_index=%d\n",
332 q->cur_avail_idx, q->cur_avail_idx % q->queue_size, q->avail->index);
334 while (q->cur_avail_idx < q->avail->index) {
335 struct vring_desc * hdr_desc = NULL;
336 struct vring_desc * buf_desc = NULL;
339 uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % q->queue_size];
340 int desc_cnt = get_desc_count(q, desc_idx);
341 uint32_t req_len = 0;
343 PrintDebug("Descriptor Count=%d, index=%d\n", desc_cnt, q->cur_avail_idx % q->queue_size);
345 hdr_desc = &(q->desc[desc_idx]);
347 PrintDebug("Header Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", hdr_desc,
348 (void *)(hdr_desc->addr_gpa), hdr_desc->length, hdr_desc->flags, hdr_desc->next);
350 if (guest_pa_to_host_va(dev->vm, hdr_desc->addr_gpa, &(hdr_addr)) == -1) {
351 PrintError("Could not translate block header address\n");
355 //memcpy(&hdr, (void *)hdr_addr, sizeof(struct virtio_net_hdr));
356 hdr_desc = (struct vring_desc *)hdr_addr;
358 PrintDebug("NIC Op Hdr (ptr=%p) type=%d, sector=%p\n", (void *)hdr_addr, hdr.hdr_len, (void *)hdr.csum_start)
360 desc_idx= hdr_desc->next;
362 for (i = 0; i < desc_cnt - 1; i++) {
363 buf_desc = &(q->desc[desc_idx]);
365 PrintDebug("Buffer Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", buf_desc,
366 (void *)(buf_desc->addr_gpa), buf_desc->length, buf_desc->flags, buf_desc->next);
368 if (pkt_write(dev, buf_desc) == -1) {
369 PrintError("Error handling nic operation\n");
373 req_len += buf_desc->length;
374 desc_idx = buf_desc->next;
377 q->used->ring[q->used->index % q->queue_size].id = q->avail->ring[q->cur_avail_idx % q->queue_size];
378 q->used->ring[q->used->index % q->queue_size].length = req_len; // What do we set this to????
384 if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
385 PrintDebug("Raising IRQ %d\n", virtio->pci_dev->config_header.intr_line);
386 v3_pci_raise_irq(virtio->virtio_dev->pci_bus, 0, virtio->pci_dev);
387 virtio->virtio_cfg.pci_isr = 0x1;
394 static int virtio_setup_queue(struct vm_device * dev, struct virtio_queue *queue, addr_t pfn, addr_t page_addr)
398 queue->ring_desc_addr = page_addr ;
399 queue->ring_avail_addr = page_addr + (queue->queue_size* sizeof(struct vring_desc));
400 queue->ring_used_addr = (queue->ring_avail_addr + \
401 sizeof(struct vring_avail) + \
402 (queue->queue_size * sizeof(uint16_t)));
404 // round up to next page boundary.
405 queue->ring_used_addr = (queue->ring_used_addr + 0xfff) & ~0xfff;
407 if (guest_pa_to_host_va(dev->vm, queue->ring_desc_addr, (addr_t *)&(queue->desc)) == -1) {
408 PrintError("Could not translate ring descriptor address\n");
413 if (guest_pa_to_host_va(dev->vm, queue->ring_avail_addr, (addr_t *)&(queue->avail)) == -1) {
414 PrintError("Could not translate ring available address\n");
419 if (guest_pa_to_host_va(dev->vm, queue->ring_used_addr, (addr_t *)&(queue->used)) == -1) {
420 PrintError("Could not translate ring used address\n");
424 PrintDebug("RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
425 (void *)(queue->ring_desc_addr),
426 (void *)(queue->ring_avail_addr),
427 (void *)(queue->ring_used_addr));
429 PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n",
430 queue->desc, queue->avail, queue->used);
437 static int virtio_io_write(uint16_t port, void * src, uint_t length, void * private_data)
439 struct vm_device * dev = (struct vm_device *)private_data;
440 struct virtio_net_state * virtio = (struct virtio_net_state *)dev->private_data;
441 int port_idx = port % virtio->io_range_size;
444 PrintDebug("VIRTIO NIC Write for port %d (index=%d) len=%d, value=%x\n",
445 port, port_idx, length, *(uint32_t *)src);
449 case GUEST_FEATURES_PORT:
451 PrintError("Illegal write length for guest features\n");
455 virtio->virtio_cfg.guest_features = *(uint32_t *)src;
456 PrintDebug("Setting Guest Features to %x\n", virtio->virtio_cfg.guest_features);
459 case VRING_PG_NUM_PORT:
461 addr_t pfn = *(uint32_t *)src;
462 addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
464 uint16_t queue_idx = virtio->virtio_cfg.vring_queue_selector;
467 virtio_setup_queue(dev, &virtio->rx_vq, pfn, page_addr);
470 virtio_setup_queue(dev, &virtio->tx_vq, pfn, page_addr);
473 virtio_setup_queue(dev, &virtio->ctrl_vq, pfn, page_addr);
480 PrintError("Illegal write length for page frame number\n");
484 case VRING_Q_SEL_PORT:
485 virtio->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
487 if (virtio->virtio_cfg.vring_queue_selector > 2) {
488 PrintError("Virtio NIC device only uses 3 queue, selected %d\n",
489 virtio->virtio_cfg.vring_queue_selector);
494 case VRING_Q_NOTIFY_PORT:
495 PrintDebug("Handling Kick\n");
496 uint16_t queue_idx = *(uint16_t *)src;
498 PrintError("receive queue notification\n");
499 }else if (queue_idx == 1){
500 if (handle_pkt_tx(dev) == -1) {
501 PrintError("Could not handle NIC Notification\n");
504 }else if (queue_idx == 2){
505 if (handle_ctrl(dev) == -1) {
506 PrintError("Could not handle NIC Notification\n");
510 PrintError("Virtio NIC device only uses 3 queue, selected %d\n",
515 case VIRTIO_STATUS_PORT:
516 virtio->virtio_cfg.status = *(uint8_t *)src;
518 if (virtio->virtio_cfg.status == 0) {
519 PrintDebug("Resetting device\n");
520 virtio_reset(virtio);
525 case VIRTIO_ISR_PORT:
526 virtio->virtio_cfg.pci_isr = *(uint8_t *)src;
537 static int virtio_io_read(uint16_t port, void * dst, uint_t length, void * private_data)
539 struct vm_device * dev = (struct vm_device *)private_data;
540 struct virtio_net_state * virtio = (struct virtio_net_state *)dev->private_data;
541 int port_idx = port % virtio->io_range_size;
542 uint16_t queue_idx = virtio->virtio_cfg.vring_queue_selector;
545 PrintDebug("VIRTIO NIC Read for port %d (index =%d), length=%d\n",
546 port, port_idx, length);
549 case HOST_FEATURES_PORT:
551 PrintError("Illegal read length for host features\n");
555 *(uint32_t *)dst = virtio->virtio_cfg.host_features;
558 case VRING_PG_NUM_PORT:
561 PrintError("Illegal read length for page frame number\n");
567 *(uint32_t *)dst = virtio->rx_vq.pfn;
570 *(uint32_t *)dst = virtio->tx_vq.pfn;
573 *(uint32_t *)dst = virtio->ctrl_vq.pfn;
580 case VRING_SIZE_PORT:
582 PrintError("Illegal read length for vring size\n");
588 *(uint16_t *)dst = virtio->rx_vq.queue_size;
591 *(uint32_t *)dst = virtio->tx_vq.queue_size;
594 *(uint32_t *)dst = virtio->ctrl_vq.queue_size;
601 case VIRTIO_STATUS_PORT:
603 PrintError("Illegal read length for status\n");
607 *(uint8_t *)dst = virtio->virtio_cfg.status;
610 case VIRTIO_ISR_PORT:
611 *(uint8_t *)dst = virtio->virtio_cfg.pci_isr;
612 virtio->virtio_cfg.pci_isr = 0;
613 v3_pci_lower_irq(virtio->virtio_dev->pci_bus, 0, virtio->pci_dev);
617 PrintError("Read of Unhandled Virtio Read\n");
625 static struct v3_device_ops dev_ops = {
633 static int register_dev(struct virtio_dev_state * virtio, struct virtio_net_state * net_state) {
635 struct pci_device * pci_dev = NULL;
636 struct v3_pci_bar bars[6];
637 int num_ports = sizeof(struct virtio_config);
638 int tmp_ports = num_ports;
641 // This gets the number of ports, rounded up to a power of 2
642 net_state->io_range_size = 1; // must be a power of 2
644 while (tmp_ports > 0) {
646 net_state->io_range_size <<= 1;
649 // this is to account for any low order bits being set in num_ports
650 // if there are none, then num_ports was already a power of 2 so we shift right to reset it
651 if ((num_ports & ((net_state->io_range_size >> 1) - 1)) == 0) {
652 net_state->io_range_size >>= 1;
656 for (i = 0; i < 6; i++) {
657 bars[i].type = PCI_BAR_NONE;
660 PrintDebug("Virtio-BLK io_range_size = %d\n", blk_state->io_range_size);
662 bars[0].type = PCI_BAR_IO;
663 bars[0].default_base_port = -1;
664 bars[0].num_ports = net_state->io_range_size;
666 bars[0].io_read = virtio_io_read;
667 bars[0].io_write = virtio_io_write;
668 bars[0].private_data = net_state;
670 pci_dev = v3_pci_register_device(virtio->pci_bus, PCI_STD_DEVICE,
671 0, PCI_AUTO_DEV_NUM, 0,
672 "LNX_VIRTIO_BLK", bars,
673 NULL, NULL, NULL, net_state);
676 PrintError("Could not register PCI Device\n");
680 pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
681 pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
684 pci_dev->config_header.device_id = VIRTIO_NET_DEV_ID;
685 pci_dev->config_header.class = PCI_CLASS_NETWORK;
686 pci_dev->config_header.subclass = PCI_NET_SUBCLASS_OTHER;
688 //TODO:how to define new one for virtio net device
689 pci_dev->config_header.subsystem_id = VIRTIO_BLOCK_SUBDEVICE_ID;
691 pci_dev->config_header.intr_pin = 1;
693 pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
696 net_state->pci_dev = pci_dev;
697 //net_state->pci_bus = pci_bus;
699 net_state->virtio_cfg.host_features = 0; //no features support now
701 net_state->rx_vq.queue_size = QUEUE_SIZE;
702 net_state->tx_vq.queue_size = QUEUE_SIZE;
703 net_state->ctrl_vq.queue_size = CTRL_QUEUE_SIZE;
705 net_state->virtio_dev = virtio;
707 virtio_reset(net_state);
714 static int connect_fn(struct guest_info * info,
715 void * frontend_data,
716 struct v3_dev_net_ops * ops,
718 void * private_data) {
720 struct virtio_dev_state * virtio = (struct virtio_dev_state *)frontend_data;
722 struct virtio_net_state * net_state = (struct virtio_net_state *)V3_Malloc(sizeof(struct virtio_net_state));
723 memset(net_state, 0, sizeof(struct virtio_net_state));
725 register_dev(virtio, net_state);
727 net_state->net_ops = ops;
728 net_state->backend_data = private_data;
734 struct net_frontend {
735 int (*connect)(struct guest_info * info,
736 void * frontend_data,
737 struct v3_dev_net_ops * ops,
742 struct list_head net_node;
748 int v3_dev_add_net_frontend(struct guest_info * info,
750 int (*connect)(struct guest_info * info,
751 void * frontend_data,
752 struct v3_dev_net_ops * ops,
754 void * private_data),
757 struct net_frontend * frontend = NULL;
759 frontend = (struct net_frontend *)V3_Malloc(sizeof(struct net_frontend));
760 memset(frontend, 0, sizeof(struct net_frontend));
762 frontend->connect = connect;
763 frontend->priv_data = priv_data;
765 list_add(&(frontend->net_node), &(info->dev_mgr.net_list));
766 v3_htable_insert(info->dev_mgr.net_table, (addr_t)(name), (addr_t)frontend);
772 int v3_dev_connect_net(struct guest_info * info,
773 char * frontend_name,
774 struct v3_dev_net_ops * ops,
776 void * private_data){
777 struct net_frontend * frontend = NULL;
779 frontend = (struct net_frontend *)v3_htable_search(info->dev_mgr.net_table,
780 (addr_t)frontend_name);
782 if (frontend == NULL) {
783 PrintError("Could not find frontend net device %s\n", frontend_name);
787 if (frontend->connect(info, frontend->priv_data, ops, cfg, private_data) == -1) {
788 PrintError("Error connecting to block frontend %s\n", frontend_name);
795 static int virtio_init(struct guest_info * vm, v3_cfg_tree_t * cfg) {
796 struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
797 struct virtio_dev_state * virtio_state = NULL;
798 char * name = v3_cfg_val(cfg, "name");
800 PrintDebug("Initializing VIRTIO Network device\n");
802 if (pci_bus == NULL) {
803 PrintError("VirtIO devices require a PCI Bus");
807 virtio_state = (struct virtio_dev_state *)V3_Malloc(sizeof(struct virtio_dev_state));
808 memset(virtio_state, 0, sizeof(struct virtio_dev_state));
810 INIT_LIST_HEAD(&(virtio_state->dev_list));
811 virtio_state->pci_bus = pci_bus;
812 virtio_state->vm = vm;
814 struct vm_device * dev = v3_allocate_device(name, &dev_ops, virtio_state);
815 if (v3_attach_device(vm, dev) == -1) {
816 PrintError("Could not attach device %s\n", name);
820 if (v3_dev_add_net_frontend(vm, name, connect_fn, (void *)virtio_state) == -1) {
821 PrintError("Could not register %s as block frontend\n", name);
828 device_register("LNX_VIRTIO_NIC", virtio_init)