/* * 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 * Copyright (c) 2008, The V3VEE Project * All rights reserved. * * Author: Jack Lange * * This is free software. You are permitted to use, * redistribute, and modify it as specified in the file "V3VEE_LICENSE". */ #include #include #include #include #include #include #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 vnet command header 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; virtio->queue[1].queue_size = QUEUE_SIZE; virtio->queue[2].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->queue[0]); 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, desc_idx=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE, desc_idx); if (desc_cnt < 3) { PrintError("VirtioVNET cmd 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; struct v3_vnet_route * route = NULL; buf_desc = &(q->desc[desc_idx]); if (guest_pa_to_host_va(core, buf_desc->addr_gpa, (addr_t *)&(route)) == -1) { PrintError("Could not translate route address\n"); return -1; } // add route PrintDebug("Adding VNET Route\n"); tmp_status = v3_vnet_add_route(route); PrintDebug("VNET Route Added\n"); if (tmp_status != 0) { PrintError("Error adding VNET ROUTE\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("VirtioVNET 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 if (queue_idx == 1) { // down queue } else if (queue_idx == 2) { // up queue } 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)