--- /dev/null
+/*
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National
+ * Science Foundation and the Department of Energy.
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico. You can find out more at
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
+ * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
+ * All rights reserved.
+ *
+ * Author: Jack Lange <jarusl@cs.northwestern.edu>
+ *
+ * This is free software. You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+#include <palacios/vmm.h>
+#include <palacios/vmm_dev_mgr.h>
+#include <palacios/vm_guest_mem.h>
+#include <devices/lnx_virtio_pci.h>
+
+#include <devices/pci.h>
+
+
+#define QUEUE_SIZE 128
+#define NUM_QUEUES 3
+
+struct vnet_config {
+ uint32_t num_links;
+ uint32_t num_routes;
+} __attribute__((packed));
+
+
+
+struct virtio_vnet_state {
+ struct vnet_config vnet_cfg;
+ struct virtio_config virtio_cfg;
+
+
+ struct vm_device * pci_bus;
+ struct pci_device * pci_dev;
+
+
+#define CTRL_QUEUE 0
+#define RECV_QUEUE 1
+#define XMIT_QUEUE 2
+ struct virtio_queue queue[NUM_QUEUES];
+
+ struct virtio_queue * cur_queue;
+
+
+ int io_range_size;
+};
+
+#define VNET_GET_ROUTES 10
+#define VNET_ADD_ROUTE 11
+#define VNET_DEL_ROUTE 12
+
+#define VNET_GET_LINKS 20
+#define VNET_ADD_LINK 21
+#define VNET_DEL_LINK 22
+
+// structure of the symmod notifier ring structures
+struct vnet_ctrl_hdr {
+ uint8_t cmd_type;
+ uint32_t num_cmds;
+} __attribute__((packed));
+
+
+static int virtio_reset(struct virtio_vnet_state * virtio) {
+
+ memset(virtio->queue, 0, sizeof(struct virtio_queue) * 2);
+
+ virtio->cur_queue = &(virtio->queue[0]);
+
+ virtio->virtio_cfg.status = 0;
+ virtio->virtio_cfg.pci_isr = 0;
+
+ virtio->queue[0].queue_size = QUEUE_SIZE;
+
+ memset(&(virtio->vnet_cfg), 0, sizeof(struct vnet_config));
+
+ return 0;
+}
+
+
+
+static int get_desc_count(struct virtio_queue * q, int index) {
+ struct vring_desc * tmp_desc = &(q->desc[index]);
+ int cnt = 1;
+
+ while (tmp_desc->flags & VIRTIO_NEXT_FLAG) {
+ tmp_desc = &(q->desc[tmp_desc->next]);
+ cnt++;
+ }
+
+ return cnt;
+}
+
+
+
+
+static int handle_cmd_kick(struct guest_info * core, struct virtio_vnet_state * vnet_state) {
+ struct virtio_queue * q = vnet_state->cur_queue;
+
+ PrintDebug("VirtioVNET: Virtio Kick on command queue\n");
+
+ while (q->cur_avail_idx < q->avail->index) {
+ struct vring_desc * hdr_desc = NULL;
+ struct vring_desc * buf_desc = NULL;
+ struct vring_desc * status_desc = NULL;
+ uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
+ uint16_t desc_cnt = get_desc_count(q, desc_idx);
+ struct vnet_ctrl_hdr * hdr = NULL;
+ int i;
+ int xfer_len = 0;
+ uint8_t * status_ptr = NULL;
+ uint8_t status = 0;
+
+
+ PrintDebug("Descriptor Count=%d, index=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE);
+
+ if (desc_cnt < 3) {
+ PrintError("Symmod loads must include at least 3 descriptors (cnt=%d)\n", desc_cnt);
+ return -1;
+ }
+
+ hdr_desc = &(q->desc[desc_idx]);
+
+ if (guest_pa_to_host_va(core, hdr_desc->addr_gpa, (addr_t *)&hdr) == -1) {
+ PrintError("Could not translate VirtioVNET header address\n");
+ return -1;
+ }
+
+ desc_idx = hdr_desc->next;
+
+ if (hdr->cmd_type == VNET_ADD_ROUTE) {
+
+ for (i = 0; i < hdr->num_cmds; i++) {
+ uint8_t tmp_status = 0;
+ uint8_t * buf = NULL;
+
+ buf_desc = &(q->desc[desc_idx]);
+
+ if (guest_pa_to_host_va(core, buf_desc->addr_gpa, (addr_t *)&(buf)) == -1) {
+ PrintError("Could not translate buffer address\n");
+ return -1;
+ }
+
+ // add route
+ PrintDebug("Adding VNET Route\n");
+
+ if (tmp_status != 0) {
+ PrintError("Error loading module segment\n");
+ status = tmp_status;
+ }
+
+ xfer_len += buf_desc->length;
+ desc_idx = buf_desc->next;
+ }
+
+ } else if (hdr->cmd_type == VNET_ADD_LINK) {
+
+
+ }
+
+
+
+ status_desc = &(q->desc[desc_idx]);
+
+ if (guest_pa_to_host_va(core, status_desc->addr_gpa, (addr_t *)&status_ptr) == -1) {
+ PrintError("SYMMOD Error could not translate status address\n");
+ return -1;
+ }
+
+ xfer_len += status_desc->length;
+ *status_ptr = status;
+
+ PrintDebug("Transferred %d bytes (xfer_len)\n", xfer_len);
+ q->used->ring[q->used->index % QUEUE_SIZE].id = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
+ q->used->ring[q->used->index % QUEUE_SIZE].length = xfer_len; // set to total inbound xfer length
+
+ q->used->index++;
+ q->cur_avail_idx++;
+ }
+
+
+ if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
+ PrintDebug("Raising IRQ %d\n", vnet_state->pci_dev->config_header.intr_line);
+ v3_pci_raise_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
+ vnet_state->virtio_cfg.pci_isr = 1;
+ }
+
+
+ return 0;
+}
+
+
+static int virtio_io_write(struct guest_info * core, uint16_t port, void * src, uint_t length, void * private_data) {
+ struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
+ int port_idx = port % vnet_state->io_range_size;
+
+
+ PrintDebug("VirtioVNET: VIRTIO VNET Write for port %d len=%d, value=%x\n",
+ port, length, *(uint32_t *)src);
+ PrintDebug("VirtioVNET: port idx=%d\n", port_idx);
+
+
+ switch (port_idx) {
+ case GUEST_FEATURES_PORT:
+ if (length != 4) {
+ PrintError("Illegal write length for guest features\n");
+ return -1;
+ }
+
+ vnet_state->virtio_cfg.guest_features = *(uint32_t *)src;
+
+ break;
+ case VRING_PG_NUM_PORT:
+ if (length == 4) {
+ addr_t pfn = *(uint32_t *)src;
+ addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT);
+
+ vnet_state->cur_queue->pfn = pfn;
+
+ vnet_state->cur_queue->ring_desc_addr = page_addr ;
+ vnet_state->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
+ vnet_state->cur_queue->ring_used_addr = ( vnet_state->cur_queue->ring_avail_addr + \
+ sizeof(struct vring_avail) + \
+ (QUEUE_SIZE * sizeof(uint16_t)));
+
+ // round up to next page boundary.
+ vnet_state->cur_queue->ring_used_addr = (vnet_state->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
+
+ if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_desc_addr, (addr_t *)&(vnet_state->cur_queue->desc)) == -1) {
+ PrintError("Could not translate ring descriptor address\n");
+ return -1;
+ }
+
+
+ if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_avail_addr, (addr_t *)&(vnet_state->cur_queue->avail)) == -1) {
+ PrintError("Could not translate ring available address\n");
+ return -1;
+ }
+
+
+ if (guest_pa_to_host_va(core, vnet_state->cur_queue->ring_used_addr, (addr_t *)&(vnet_state->cur_queue->used)) == -1) {
+ PrintError("Could not translate ring used address\n");
+ return -1;
+ }
+
+ PrintDebug("VirtioVNET: RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
+ (void *)(vnet_state->cur_queue->ring_desc_addr),
+ (void *)(vnet_state->cur_queue->ring_avail_addr),
+ (void *)(vnet_state->cur_queue->ring_used_addr));
+
+ PrintDebug("VirtioVNET: RingDesc=%p, Avail=%p, Used=%p\n",
+ vnet_state->cur_queue->desc, vnet_state->cur_queue->avail, vnet_state->cur_queue->used);
+
+ } else {
+ PrintError("Illegal write length for page frame number\n");
+ return -1;
+ }
+ break;
+ case VRING_Q_SEL_PORT:
+ vnet_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
+
+ if (vnet_state->virtio_cfg.vring_queue_selector > NUM_QUEUES) {
+ PrintError("Virtio Symbiotic device has no qeueues. Selected %d\n",
+ vnet_state->virtio_cfg.vring_queue_selector);
+ return -1;
+ }
+
+ vnet_state->cur_queue = &(vnet_state->queue[vnet_state->virtio_cfg.vring_queue_selector]);
+
+ break;
+ case VRING_Q_NOTIFY_PORT: {
+ uint16_t queue_idx = *(uint16_t *)src;
+
+ PrintDebug("VirtioVNET: Handling Kick\n");
+
+ if (queue_idx == 0) {
+ if (handle_cmd_kick(core, vnet_state) == -1) {
+ PrintError("Could not handle VNET Control command\n");
+ return -1;
+ }
+ } else {
+ PrintError("Kick on invalid queue (%d)\n", queue_idx);
+ return -1;
+ }
+
+ break;
+ }
+ case VIRTIO_STATUS_PORT:
+ vnet_state->virtio_cfg.status = *(uint8_t *)src;
+
+ if (vnet_state->virtio_cfg.status == 0) {
+ PrintDebug("VirtioVNET: Resetting device\n");
+ virtio_reset(vnet_state);
+ }
+
+ break;
+
+ case VIRTIO_ISR_PORT:
+ vnet_state->virtio_cfg.pci_isr = *(uint8_t *)src;
+ break;
+ default:
+ return -1;
+ break;
+ }
+
+ return length;
+}
+
+
+static int virtio_io_read(struct guest_info * core, uint16_t port, void * dst, uint_t length, void * private_data) {
+
+ struct virtio_vnet_state * vnet_state = (struct virtio_vnet_state *)private_data;
+ int port_idx = port % vnet_state->io_range_size;
+
+/*
+ PrintDebug("VirtioVNET: VIRTIO SYMBIOTIC Read for port %d (index =%d), length=%d\n",
+ port, port_idx, length);
+*/
+ switch (port_idx) {
+ case HOST_FEATURES_PORT:
+ if (length != 4) {
+ PrintError("Illegal read length for host features\n");
+ return -1;
+ }
+
+ *(uint32_t *)dst = vnet_state->virtio_cfg.host_features;
+
+ break;
+ case VRING_PG_NUM_PORT:
+ if (length != 4) {
+ PrintError("Illegal read length for page frame number\n");
+ return -1;
+ }
+
+ *(uint32_t *)dst = vnet_state->cur_queue->pfn;
+
+ break;
+ case VRING_SIZE_PORT:
+ if (length != 2) {
+ PrintError("Illegal read length for vring size\n");
+ return -1;
+ }
+
+ *(uint16_t *)dst = vnet_state->cur_queue->queue_size;
+
+ break;
+
+ case VIRTIO_STATUS_PORT:
+ if (length != 1) {
+ PrintError("Illegal read length for status\n");
+ return -1;
+ }
+
+ *(uint8_t *)dst = vnet_state->virtio_cfg.status;
+ break;
+
+ case VIRTIO_ISR_PORT:
+ *(uint8_t *)dst = vnet_state->virtio_cfg.pci_isr;
+ vnet_state->virtio_cfg.pci_isr = 0;
+ v3_pci_lower_irq(vnet_state->pci_bus, 0, vnet_state->pci_dev);
+ break;
+
+ default:
+ if ( (port_idx >= sizeof(struct virtio_config)) &&
+ (port_idx < (sizeof(struct virtio_config) + sizeof(struct vnet_config))) ) {
+ int cfg_offset = port_idx - sizeof(struct virtio_config);
+ uint8_t * cfg_ptr = (uint8_t *)&(vnet_state->vnet_cfg);
+
+ memcpy(dst, cfg_ptr + cfg_offset, length);
+
+ } else {
+ PrintError("Read of Unhandled Virtio Read\n");
+ return -1;
+ }
+
+ break;
+ }
+
+ return length;
+}
+
+
+
+static struct v3_device_ops dev_ops = {
+ .free = NULL,
+ .reset = NULL,
+ .start = NULL,
+ .stop = NULL,
+};
+
+
+static int vnet_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
+ struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus"));
+ struct virtio_vnet_state * virtio_state = NULL;
+ struct pci_device * pci_dev = NULL;
+ char * name = v3_cfg_val(cfg, "name");
+
+ PrintDebug("VirtioVNET: Initializing VIRTIO VNET Control device\n");
+
+ if (pci_bus == NULL) {
+ PrintError("VirtIO devices require a PCI Bus");
+ return -1;
+ }
+
+ virtio_state = (struct virtio_vnet_state *)V3_Malloc(sizeof(struct virtio_vnet_state));
+ memset(virtio_state, 0, sizeof(struct virtio_vnet_state));
+
+ struct vm_device * dev = v3_allocate_device(name, &dev_ops, virtio_state);
+
+ if (v3_attach_device(vm, dev) == -1) {
+ PrintError("Could not attach device %s\n", name);
+ return -1;
+ }
+
+
+ // PCI initialization
+ {
+ struct v3_pci_bar bars[6];
+ int num_ports = sizeof(struct virtio_config) + sizeof(struct vnet_config);
+ int tmp_ports = num_ports;
+ int i;
+
+
+ // This gets the number of ports, rounded up to a power of 2
+ virtio_state->io_range_size = 1; // must be a power of 2
+
+ while (tmp_ports > 0) {
+ tmp_ports >>= 1;
+ virtio_state->io_range_size <<= 1;
+ }
+
+ // this is to account for any low order bits being set in num_ports
+ // if there are none, then num_ports was already a power of 2 so we shift right to reset it
+ if ((num_ports & ((virtio_state->io_range_size >> 1) - 1)) == 0) {
+ virtio_state->io_range_size >>= 1;
+ }
+
+
+ for (i = 0; i < 6; i++) {
+ bars[i].type = PCI_BAR_NONE;
+ }
+
+ bars[0].type = PCI_BAR_IO;
+ bars[0].default_base_port = -1;
+ bars[0].num_ports = virtio_state->io_range_size;
+
+ bars[0].io_read = virtio_io_read;
+ bars[0].io_write = virtio_io_write;
+ bars[0].private_data = virtio_state;
+
+ pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
+ 0, PCI_AUTO_DEV_NUM, 0,
+ "LNX_VIRTIO_VNET", bars,
+ NULL, NULL, NULL, virtio_state);
+
+ if (!pci_dev) {
+ PrintError("Could not register PCI Device\n");
+ return -1;
+ }
+
+ pci_dev->config_header.vendor_id = VIRTIO_VENDOR_ID;
+ pci_dev->config_header.subsystem_vendor_id = VIRTIO_SUBVENDOR_ID;
+
+
+ pci_dev->config_header.device_id = VIRTIO_VNET_DEV_ID;
+ pci_dev->config_header.class = PCI_CLASS_MEMORY;
+ pci_dev->config_header.subclass = PCI_MEM_SUBCLASS_RAM;
+
+ pci_dev->config_header.subsystem_id = VIRTIO_VNET_SUBDEVICE_ID;
+
+
+ pci_dev->config_header.intr_pin = 1;
+
+ pci_dev->config_header.max_latency = 1; // ?? (qemu does it...)
+
+
+ virtio_state->pci_dev = pci_dev;
+ virtio_state->pci_bus = pci_bus;
+ }
+
+ virtio_reset(virtio_state);
+
+
+ return 0;
+}
+
+
+device_register("LNX_VIRTIO_VNET", vnet_init)
