#include <palacios/vmm.h>
#include <palacios/vmm_dev_mgr.h>
#include <devices/lnx_virtio_pci.h>
-
+#include <devices/lnx_virtio_blk.h>
+#include <devices/block_dev.h>
+#include <palacios/vm_guest_mem.h>
#include <devices/pci.h>
+#define BLK_CAPACITY_PORT 20
+#define BLK_MAX_SIZE_PORT 28
+#define BLK_MAX_SEG_PORT 32
+#define BLK_CYLINDERS_PORT 36
+#define BLK_HEADS_PORT 38
+#define BLK_SECTS_PORT 39
+
+#define BLK_IN_REQ 0
+#define BLK_OUT_REQ 1
+#define BLK_SCSI_CMD 2
+
+#define BLK_BARRIER_FLAG 0x80000000
+
+#define BLK_STATUS_OK 0
+#define BLK_STATUS_ERR 1
+#define BLK_STATUS_NOT_SUPPORTED 2
+
+
struct blk_config {
uint64_t capacity;
uint32_t max_size;
+struct blk_op_hdr {
+ uint32_t type;
+ uint32_t prior;
+ uint64_t sector;
+} __attribute__((packed));
+
+#define QUEUE_SIZE 128
/* Host Feature flags */
#define VIRTIO_BARRIER 0x01 /* Does host support barriers? */
+
struct virtio_blk_state {
struct blk_config block_cfg;
struct virtio_config virtio_cfg;
struct vm_device * pci_bus;
struct pci_device * pci_dev;
-
- struct virtio_device * virtio_dev; // the virtio device struction for _this_ device
+ struct virtio_queue queue;
+
+ union {
+ struct v3_cd_ops * cd_ops;
+ struct v3_hd_ops * hd_ops;
+ };
+
+ v3_block_type_t block_type;
+ void * backend_data;
int io_range_size;
};
+static int virtio_free(struct vm_device * dev) {
+ return -1;
+}
+
+static int virtio_reset(struct vm_device * dev) {
+ struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data;
+
+ virtio->queue.ring_desc_addr = 0;
+ virtio->queue.ring_avail_addr = 0;
+ virtio->queue.ring_used_addr = 0;
+ virtio->queue.pfn = 0;
+ virtio->queue.cur_avail_idx = 0;
+
+ virtio->virtio_cfg.status = 0;
+ virtio->virtio_cfg.pci_isr = 0;
+
+ return 0;
+}
+
+static int handle_read_op(struct vm_device * dev, uint8_t * buf, uint64_t sector, uint32_t len) {
+ struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data;
+
+ if (virtio->block_type == BLOCK_DISK) {
+ if (len % HD_SECTOR_SIZE) {
+ PrintError("Write of something that is not a sector len %d, mod=%d\n", len, len % HD_SECTOR_SIZE);
+ return -1;
+ }
+
+
+ PrintDebug("Reading Disk\n");
+
+ return virtio->hd_ops->read(buf, len / HD_SECTOR_SIZE, sector * HD_SECTOR_SIZE, virtio->backend_data);
+ } else if (virtio->block_type == BLOCK_CDROM) {
+ if (len % ATAPI_BLOCK_SIZE) {
+ PrintError("Write of something that is not an ATAPI block len %d, mod=%d\n", len, len % ATAPI_BLOCK_SIZE);
+ return -1;
+ }
+
+ return virtio->cd_ops->read(buf, len / ATAPI_BLOCK_SIZE, sector * ATAPI_BLOCK_SIZE, virtio->backend_data);
+
+ }
+
+ return -1;
+}
+
+
+static int handle_write_op(struct vm_device * dev, uint8_t * buf, uint64_t sector, uint32_t len) {
+ struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data;
+
+
+ if (virtio->block_type == BLOCK_DISK) {
+ if (len % HD_SECTOR_SIZE) {
+ PrintError("Write of something that is not a sector len %d, mod=%d\n", len, len % HD_SECTOR_SIZE);
+ return -1;
+ }
+
+ PrintDebug("Writing Disk\n");
+
+ return virtio->hd_ops->write(buf, len / HD_SECTOR_SIZE, sector * HD_SECTOR_SIZE, virtio->backend_data);
+ }
+
+ return -1;
+}
+
+
+static int handle_block_op(struct vm_device * dev, struct vring_desc * hdr_desc,
+ struct vring_desc * buf_desc, struct vring_desc * status_desc) {
+ struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data;
+ struct blk_op_hdr * hdr = NULL;
+ uint8_t * buf = NULL;
+ uint8_t * status = NULL;
+
+
+ PrintDebug("Handling Block op\n");
+
+ if (guest_pa_to_host_va(dev->vm, hdr_desc->addr_gpa, (addr_t *)&(hdr)) == -1) {
+ PrintError("Could not translate block header address\n");
+ return -1;
+ }
+
+
+ if (guest_pa_to_host_va(dev->vm, buf_desc->addr_gpa, (addr_t *)&(buf)) == -1) {
+ PrintError("Could not translate buffer address\n");
+ return -1;
+ }
+
+ if (guest_pa_to_host_va(dev->vm, status_desc->addr_gpa, (addr_t *)&(status)) == -1) {
+ PrintError("Could not translate status address\n");
+ return -1;
+ }
+
+ if (hdr->type == BLK_IN_REQ) {
+ if (virtio->block_type != BLOCK_NONE) {
+ if (handle_read_op(dev, buf, hdr->sector, buf_desc->length) == -1) {
+ *status = BLK_STATUS_ERR;
+ } else {
+ *status = BLK_STATUS_OK;
+ }
+ } else {
+ *status = BLK_STATUS_NOT_SUPPORTED;
+ }
+
+ } else if (hdr->type == BLK_OUT_REQ) {
+ if (virtio->block_type == BLOCK_DISK) {
+ if (handle_write_op(dev, buf, hdr->sector, buf_desc->length) == -1) {
+ *status = BLK_STATUS_ERR;
+ } else {
+ *status = BLK_STATUS_OK;
+ }
+ } else {
+ *status = BLK_STATUS_NOT_SUPPORTED;
+ }
+ } else if (hdr->type == BLK_SCSI_CMD) {
+ *status = BLK_STATUS_NOT_SUPPORTED;
+ }
+
+
+
+
+ return 0;
+}
+
+
+
+static int handle_kick(struct vm_device * dev) {
+ struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data;
+ struct virtio_queue * q = &(virtio->queue);
+
+
+ PrintDebug("VIRTIO KICK: cur_index=%d, avail_index=%d\n", q->cur_avail_idx, q->avail->index);
+
+ 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 chain_idx = q->avail->ring[q->cur_avail_idx];
+ uint32_t req_len = 0;
+ int chained = 1;
+
+ PrintDebug("chained=%d, Chain Index=%d\n", chained, chain_idx);
+
+ while (chained) {
+ hdr_desc = &(q->desc[chain_idx]);
+
+ PrintDebug("Header Descriptor gpa=%p, len=%d, flags=%x, next=%d\n",
+ (void *)(hdr_desc->addr_gpa), hdr_desc->length, hdr_desc->flags, hdr_desc->next);
+
+
+ if (!(hdr_desc->flags & VIRTIO_NEXT_FLAG)) {
+ PrintError("Block operations must chain a buffer descriptor\n");
+ return -1;
+ }
+
+ buf_desc = &(q->desc[hdr_desc->next]);
+
+
+ PrintDebug("Buffer Descriptor gpa=%p, len=%d, flags=%x, next=%d\n",
+ (void *)(buf_desc->addr_gpa), buf_desc->length, buf_desc->flags, buf_desc->next);
+
+
+ if (!(buf_desc->flags & VIRTIO_NEXT_FLAG)) {
+ PrintError("Block operatoins must chain a status descriptor\n");
+ return -1;
+ }
+
+ status_desc = &(q->desc[buf_desc->next]);
+
+ // We detect whether we are chained here...
+ if (status_desc->flags & VIRTIO_NEXT_FLAG) {
+ chained = 1;
+ chain_idx = status_desc->next;
+ } else {
+ chained = 0;
+ }
+
+ PrintDebug("Status Descriptor gpa=%p, len=%d, flags=%x, next=%d\n",
+ (void *)(status_desc->addr_gpa), status_desc->length, status_desc->flags, status_desc->next);
+
+
+ if (handle_block_op(dev, hdr_desc, buf_desc, status_desc) == -1) {
+ PrintError("Error handling block operation\n");
+ return -1;
+ }
+
+ req_len += (buf_desc->length + status_desc->length);
+
+ }
+
+ q->used->ring[q->used->index].id = q->cur_avail_idx;
+ q->used->ring[q->used->index].length = req_len; // What do we set this to????
+
+ q->used->index = (q->used->index + 1) % (QUEUE_SIZE * sizeof(struct vring_desc));;
+ q->cur_avail_idx = (q->cur_avail_idx + 1) % (QUEUE_SIZE * sizeof(struct vring_desc));
+ }
+
+ 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);
+ }
+
+ return 0;
+}
+
static int virtio_io_write(uint16_t port, void * src, uint_t length, struct vm_device * dev) {
struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data;
int port_idx = port % virtio->io_range_size;
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->queue.pfn = pfn;
+
+ virtio->queue.ring_desc_addr = page_addr ;
+ virtio->queue.ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc));
+ virtio->queue.ring_used_addr = ( virtio->queue.ring_avail_addr + \
+ sizeof(struct vring_avail) + \
+ (QUEUE_SIZE * sizeof(uint16_t)));
+
+ // round up to next page boundary.
+ virtio->queue.ring_used_addr = (virtio->queue.ring_used_addr + 0xfff) & ~0xfff;
+
+ if (guest_pa_to_host_va(dev->vm, virtio->queue.ring_desc_addr, (addr_t *)&(virtio->queue.desc)) == -1) {
+ PrintError("Could not translate ring descriptor address\n");
+ return -1;
+ }
+
+
+ if (guest_pa_to_host_va(dev->vm, virtio->queue.ring_avail_addr, (addr_t *)&(virtio->queue.avail)) == -1) {
+ PrintError("Could not translate ring available address\n");
+ return -1;
+ }
+
+
+ if (guest_pa_to_host_va(dev->vm, virtio->queue.ring_used_addr, (addr_t *)&(virtio->queue.used)) == -1) {
+ PrintError("Could not translate ring used address\n");
+ return -1;
+ }
+
+ PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n",
+ (void *)(virtio->queue.ring_desc_addr),
+ (void *)(virtio->queue.ring_avail_addr),
+ (void *)(virtio->queue.ring_used_addr));
+
+ } 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 Block device only uses 1 queue, selected %d\n",
+ virtio->virtio_cfg.vring_queue_selector);
+ return -1;
+ }
+
+ break;
case VRING_Q_NOTIFY_PORT:
- // handle output
- PrintError("Notification\n");
- return -1;
+ PrintDebug("Handling Kick\n");
+ if (handle_kick(dev) == -1) {
+ PrintError("Could not handle Block 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");
- return -1;
- //reset
+ virtio_reset(dev);
}
+
break;
default:
return -1;
port, port_idx, length);
switch (port_idx) {
- // search for device....
- // call and return dev config read
+ 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->queue.pfn;
+
+ break;
+ case VRING_SIZE_PORT:
+ if (length != 2) {
+ PrintError("Illegal read length for vring size\n");
+ return -1;
+ }
+
+ *(uint16_t *)dst = virtio->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;
+
default:
- return -1;
+ if ( (port_idx >= sizeof(struct virtio_config)) &&
+ (port_idx < (sizeof(struct virtio_config) + sizeof(struct blk_config))) ) {
+
+ uint8_t * cfg_ptr = (uint8_t *)&(virtio->block_cfg);
+ memcpy(dst, cfg_ptr, length);
+
+ } else {
+ PrintError("Read of Unhandled Virtio Read\n");
+ return -1;
+ }
+
+ break;
}
- return length;
-}
-static int virtio_free(struct vm_device * dev) {
- return -1;
+ return length;
}
+int v3_virtio_register_cdrom(struct vm_device * dev, struct v3_cd_ops * ops, void * private_data) {
+ struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data;
+
+ virtio->block_type = BLOCK_CDROM;
+ virtio->cd_ops = ops;
+ virtio->backend_data = private_data;
+
+ virtio->block_cfg.capacity = ops->get_capacity(private_data);
+
+ return 0;
+}
+
+
+int v3_virtio_register_harddisk(struct vm_device * dev, struct v3_hd_ops * ops, void * private_data) {
+ struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data;
+
+ virtio->block_type = BLOCK_DISK;
+ virtio->hd_ops = ops;
+ virtio->backend_data = private_data;
+
+ virtio->block_cfg.capacity = ops->get_capacity(private_data);
+
+ return 0;
+}
+
static int virtio_init(struct guest_info * vm, void * cfg_data) {
virtio_state->pci_dev = pci_dev;
virtio_state->pci_bus = pci_bus;
-
- /* Block configuration */
}
-
+
+ /* Block configuration */
+ virtio_state->virtio_cfg.host_features = VIRTIO_SEG_MAX;
+
+ // Virtio Block only uses one queue
+ virtio_state->queue.queue_size = QUEUE_SIZE;
+
+ virtio_reset(dev);
+
+ virtio_state->backend_data = NULL;
+ virtio_state->block_type = BLOCK_NONE;
+ virtio_state->hd_ops = NULL;
+
return 0;
}
