--- /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 SYM_MAGIC_PORT 20
+#define SYM_SWAP_BASE_PORT 24
+#define SYM_SWAP_SIZE_PORT 32
+
+
+#define QUEUE_SIZE 128
+
+struct sym_config {
+ uint32_t magic;
+ uint64_t swap_base;
+ uint32_t swap_size;
+} __attribute__((packed));
+
+
+
+struct virtio_sym_state {
+ struct sym_config sym_cfg;
+ struct virtio_config virtio_cfg;
+
+
+ struct vm_device * pci_bus;
+ struct pci_device * pci_dev;
+
+ struct virtio_queue queue[1];
+
+ struct virtio_queue * cur_queue;
+
+ int io_range_size;
+};
+
+
+
+
+
+static int virtio_reset(struct vm_device * dev) {
+ struct virtio_sym_state * virtio = (struct virtio_sym_state *)dev->private_data;
+
+ memset(virtio->queue, 0, sizeof(struct virtio_queue));
+
+ virtio->cur_queue = &(virtio->queue[0]);
+
+
+ virtio->virtio_cfg.status = 0;
+ virtio->virtio_cfg.pci_isr = 0;
+
+ virtio->queue[1].queue_size = QUEUE_SIZE;
+
+
+ memset(&(virtio->sym_cfg), 0, sizeof(struct sym_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_kick(struct vm_device * dev) {
+ struct virtio_sym_state * virtio = (struct virtio_sym_state *)dev->private_data;
+ struct virtio_queue * q = virtio->cur_queue;
+
+ return -1;
+
+ PrintDebug("VIRTIO Symbiotic KICK: cur_index=%d (mod=%d), avail_index=%d\n",
+ q->cur_avail_idx, q->cur_avail_idx % QUEUE_SIZE, q->avail->index);
+
+ while (q->cur_avail_idx < q->avail->index) {
+ struct vring_desc * tmp_desc = NULL;
+ uint16_t desc_idx = q->avail->ring[q->cur_avail_idx % QUEUE_SIZE];
+ int desc_cnt = get_desc_count(q, desc_idx);
+ int i = 0;
+ uint32_t req_len = 0;
+
+
+ PrintDebug("Descriptor Count=%d, index=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE);
+
+ for (i = 0; i < desc_cnt; i++) {
+ addr_t page_addr;
+ tmp_desc = &(q->desc[desc_idx]);
+
+ PrintDebug("Header Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", tmp_desc,
+ (void *)(tmp_desc->addr_gpa), tmp_desc->length,
+ tmp_desc->flags, tmp_desc->next);
+
+
+ if (guest_pa_to_host_va(dev->vm, tmp_desc->addr_gpa, (addr_t *)&(page_addr)) == -1) {
+ PrintError("Could not translate block header address\n");
+ return -1;
+ }
+
+ /*
+ if (handle_sym_op(dev, tmp_desc, buf_desc, status_desc) == -1) {
+ PrintError("Error handling symbiotic operation\n");
+ return -1;
+ }
+ */
+
+ PrintDebug("Symbiotic Device Currently Ignored\n");
+
+
+ req_len += tmp_desc->length;
+ desc_idx = tmp_desc->next;
+ }
+
+ 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 = req_len; // What do we set this to????
+
+ q->used->index++;
+ q->cur_avail_idx++;
+ }
+
+ if (!(q->avail->flags & VIRTIO_NO_IRQ_FLAG)) {
+ PrintDebug("Raising IRQ %d\n", virtio->pci_dev->config_header.intr_line);
+ v3_pci_raise_irq(virtio->pci_bus, 0, virtio->pci_dev);
+ virtio->virtio_cfg.pci_isr = VIRTIO_ISR_ACTIVE;
+ }
+
+ return 0;
+}
+
+
+static int virtio_io_write(uint16_t port, void * src, uint_t length, struct vm_device * dev) {
+ struct virtio_sym_state * virtio = (struct virtio_sym_state *)dev->private_data;
+ int port_idx = port % virtio->io_range_size;
+
+
+ PrintDebug("VIRTIO SYMBIOTIC Write for port %d (index=%d) len=%d, value=%x\n",
+ port, port_idx, length, *(uint32_t *)src);
+
+
+
+ switch (port_idx) {
+ case GUEST_FEATURES_PORT:
+ if (length != 4) {
+ PrintError("Illegal write length for guest features\n");
+ return -1;
+ }
+
+ virtio->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);
+
+
+ virtio->cur_queue->pfn = pfn;
+
+ virtio->cur_queue->ring_desc_addr = page_addr ;
+ virtio->cur_queue->ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
+ virtio->cur_queue->ring_used_addr = ( virtio->cur_queue->ring_avail_addr + \
+ sizeof(struct vring_avail) + \
+ (QUEUE_SIZE * sizeof(uint16_t)));
+
+ // round up to next page boundary.
+ virtio->cur_queue->ring_used_addr = (virtio->cur_queue->ring_used_addr + 0xfff) & ~0xfff;
+
+ if (guest_pa_to_host_va(dev->vm, virtio->cur_queue->ring_desc_addr, (addr_t *)&(virtio->cur_queue->desc)) == -1) {
+ PrintError("Could not translate ring descriptor address\n");
+ return -1;
+ }
+
+
+ if (guest_pa_to_host_va(dev->vm, virtio->cur_queue->ring_avail_addr, (addr_t *)&(virtio->cur_queue->avail)) == -1) {
+ PrintError("Could not translate ring available address\n");
+ return -1;
+ }
+
+
+ if (guest_pa_to_host_va(dev->vm, virtio->cur_queue->ring_used_addr, (addr_t *)&(virtio->cur_queue->used)) == -1) {
+ PrintError("Could not translate ring used address\n");
+ return -1;
+ }
+
+ PrintDebug("RingDesc_addr=%p, Avail_addr=%p, Used_addr=%p\n",
+ (void *)(virtio->cur_queue->ring_desc_addr),
+ (void *)(virtio->cur_queue->ring_avail_addr),
+ (void *)(virtio->cur_queue->ring_used_addr));
+
+ PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n",
+ virtio->cur_queue->desc, virtio->cur_queue->avail, virtio->cur_queue->used);
+
+ } else {
+ PrintError("Illegal write length for page frame number\n");
+ return -1;
+ }
+ break;
+ case VRING_Q_SEL_PORT:
+ virtio->virtio_cfg.vring_queue_selector = *(uint16_t *)src;
+
+ if (virtio->virtio_cfg.vring_queue_selector > 0) {
+ PrintError("Virtio Symbiotic device has not qeueues. Selected %d\n",
+ virtio->virtio_cfg.vring_queue_selector);
+ return -1;
+ }
+
+ virtio->cur_queue = &(virtio->queue[virtio->virtio_cfg.vring_queue_selector]);
+
+ break;
+ case VRING_Q_NOTIFY_PORT:
+ PrintDebug("Handling Kick\n");
+ if (handle_kick(dev) == -1) {
+ PrintError("Could not handle Symbiotic Notification\n");
+ return -1;
+ }
+ break;
+ case VIRTIO_STATUS_PORT:
+ virtio->virtio_cfg.status = *(uint8_t *)src;
+
+ if (virtio->virtio_cfg.status == 0) {
+ PrintDebug("Resetting device\n");
+ virtio_reset(dev);
+ }
+
+ break;
+
+ case VIRTIO_ISR_PORT:
+ virtio->virtio_cfg.pci_isr = *(uint8_t *)src;
+ break;
+ default:
+ return -1;
+ break;
+ }
+
+ return length;
+}
+
+
+static int virtio_io_read(uint16_t port, void * dst, uint_t length, struct vm_device * dev) {
+ struct virtio_sym_state * virtio = (struct virtio_sym_state *)dev->private_data;
+ int port_idx = port % virtio->io_range_size;
+
+
+ PrintDebug("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 = virtio->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 = virtio->cur_queue->pfn;
+
+ break;
+ case VRING_SIZE_PORT:
+ if (length != 2) {
+ PrintError("Illegal read length for vring size\n");
+ return -1;
+ }
+
+ *(uint16_t *)dst = virtio->cur_queue->queue_size;
+
+ break;
+
+ case VIRTIO_STATUS_PORT:
+ if (length != 1) {
+ PrintError("Illegal read length for status\n");
+ return -1;
+ }
+
+ *(uint8_t *)dst = virtio->virtio_cfg.status;
+ break;
+
+ case VIRTIO_ISR_PORT:
+ *(uint8_t *)dst = virtio->virtio_cfg.pci_isr;
+ virtio->virtio_cfg.pci_isr = 0;
+ v3_pci_lower_irq(virtio->pci_bus, 0, virtio->pci_dev);
+ break;
+
+ default:
+ if ( (port_idx >= sizeof(struct virtio_config)) &&
+ (port_idx < (sizeof(struct virtio_config) + sizeof(struct sym_config))) ) {
+ int cfg_offset = port_idx - sizeof(struct virtio_config);
+ uint8_t * cfg_ptr = (uint8_t *)&(virtio->sym_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 virtio_init(struct guest_info * vm, void * cfg_data) {
+ struct vm_device * pci_bus = v3_find_dev(vm, (char *)cfg_data);
+ struct virtio_sym_state * virtio_state = NULL;
+ struct pci_device * pci_dev = NULL;
+
+ PrintDebug("Initializing VIRTIO Symbiotic device\n");
+
+ if (pci_bus == NULL) {
+ PrintError("VirtIO devices require a PCI Bus");
+ return -1;
+ }
+
+
+ virtio_state = (struct virtio_sym_state *)V3_Malloc(sizeof(struct virtio_sym_state));
+ memset(virtio_state, 0, sizeof(struct virtio_sym_state));
+
+
+ struct vm_device * dev = v3_allocate_device("LNX_VIRTIO_SYM", &dev_ops, virtio_state);
+ if (v3_attach_device(vm, dev) == -1) {
+ PrintError("Could not attach device %s\n", "LNX_VIRTIO_SYM");
+ return -1;
+ }
+
+
+ // PCI initialization
+ {
+ struct v3_pci_bar bars[6];
+ int num_ports = sizeof(struct virtio_config) + sizeof(struct sym_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;
+
+ pci_dev = v3_pci_register_device(pci_bus, PCI_STD_DEVICE,
+ 0, PCI_AUTO_DEV_NUM, 0,
+ "LNX_VIRTIO_SYM", bars,
+ NULL, NULL, NULL, dev);
+
+ 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_SYMBIOTIC_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_SYMBIOTIC_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(dev);
+
+
+ return 0;
+}
+
+
+device_register("LNX_VIRTIO_SYM", virtio_init)
