X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=blobdiff_plain;f=palacios%2Fsrc%2Fdevices%2Flnx_virtio_blk.c;h=7bc41a63209e28f73a0242bf5aa02f5c9f0daf0a;hp=5b40144468054b56bbb4405adcd5eb3452220c67;hb=123a1ba27ea09c8fa77a1b36ce625b43d7c48b14;hpb=ec75f3ad6503e3c7996e7a445404b8813740804d diff --git a/palacios/src/devices/lnx_virtio_blk.c b/palacios/src/devices/lnx_virtio_blk.c index 5b40144..7bc41a6 100644 --- a/palacios/src/devices/lnx_virtio_blk.c +++ b/palacios/src/devices/lnx_virtio_blk.c @@ -18,13 +18,38 @@ */ #include - +#include #include - +#include #include + +#ifndef CONFIG_DEBUG_VIRTIO_BLK +#undef PrintDebug +#define PrintDebug(fmt, args...) +#endif + + +#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; @@ -36,6 +61,13 @@ struct blk_config { +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? */ @@ -44,69 +76,427 @@ struct blk_config { #define VIRTIO_LEGACY_GEOM 0x10 /* Indicates support of legacy geometry */ +struct virtio_dev_state { + struct vm_device * pci_bus; + struct list_head dev_list; + struct guest_info * vm; +}; 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 blk_config block_cfg; + struct virtio_config virtio_cfg; - struct virtio_device * virtio_dev; // the virtio device struction for _this_ device + struct virtio_queue queue; - int io_range_size; -}; + struct v3_dev_blk_ops * ops; + void * backend_data; + int io_range_size; + struct virtio_dev_state * virtio_dev; + struct list_head dev_link; +}; static int virtio_free(struct vm_device * dev) { return -1; } +static int blk_reset(struct virtio_blk_state * virtio) { + 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 struct v3_device_ops dev_ops = { - .free = virtio_free, - .reset = NULL, - .start = NULL, - .stop = NULL, -}; +static int virtio_reset(struct vm_device * dev) { + struct virtio_dev_state * dev_state = (struct virtio_dev_state *)(dev->private_data); + struct virtio_blk_state * blk_state = NULL; + list_for_each_entry(blk_state, &(dev_state->dev_list), dev_link) { + blk_reset(blk_state); + } + return 0; +} +static int handle_read_op(struct virtio_blk_state * blk_state, uint8_t * buf, uint64_t * sector, uint64_t len) { + int ret = -1; + PrintDebug("Reading Disk\n"); + ret = blk_state->ops->read(buf, *sector, len, (void *)(blk_state->backend_data)); + *sector += len; -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_blk_state * virtio_state = NULL; - struct pci_device * pci_dev = NULL; + return ret; +} - PrintDebug("Initializing VIRTIO Block device\n"); - if (pci_bus == NULL) { - PrintError("VirtIO devices require a PCI Bus"); +static int handle_write_op(struct virtio_blk_state * blk_state, uint8_t * buf, uint64_t * sector, uint64_t len) { + int ret = -1; + + PrintDebug("Writing Disk\n"); + ret = blk_state->ops->write(buf, *sector, len, (void *)(blk_state->backend_data)); + *sector += len; + + return ret; +} + + + +// multiple block operations need to increment the sector + +static int handle_block_op(struct virtio_blk_state * blk_state, struct blk_op_hdr * hdr, + struct vring_desc * buf_desc, uint8_t * status) { + uint8_t * buf = NULL; + + PrintDebug("Handling Block op\n"); + if (guest_pa_to_host_va(blk_state->virtio_dev->vm, buf_desc->addr_gpa, (addr_t *)&(buf)) == -1) { + PrintError("Could not translate buffer address\n"); + return -1; + } + + PrintDebug("Sector=%p Length=%d\n", (void *)(addr_t)(hdr->sector), buf_desc->length); + + if (hdr->type == BLK_IN_REQ) { + if (handle_read_op(blk_state, buf, &(hdr->sector), buf_desc->length) == -1) { + *status = BLK_STATUS_ERR; + return -1; + } else { + *status = BLK_STATUS_OK; + } + } else if (hdr->type == BLK_OUT_REQ) { + if (handle_write_op(blk_state, buf, &(hdr->sector), buf_desc->length) == -1) { + *status = BLK_STATUS_ERR; + return -1; + } else { + *status = BLK_STATUS_OK; + } + } else if (hdr->type == BLK_SCSI_CMD) { + PrintError("VIRTIO: SCSI Command Not supported!!!\n"); + *status = BLK_STATUS_NOT_SUPPORTED; return -1; } + PrintDebug("Returning Status: %d\n", *status); + + return 0; +} + +static int get_desc_count(struct virtio_queue * q, int index) { + struct vring_desc * tmp_desc = &(q->desc[index]); + int cnt = 1; - virtio_state = (struct virtio_blk_state *)V3_Malloc(sizeof(struct virtio_blk_state)); - memset(virtio_state, 0, sizeof(struct virtio_blk_state)); + while (tmp_desc->flags & VIRTIO_NEXT_FLAG) { + tmp_desc = &(q->desc[tmp_desc->next]); + cnt++; + } + return cnt; +} - struct vm_device * dev = v3_allocate_device("LNX_VIRTIO_BLK", &dev_ops, virtio_state); - if (v3_attach_device(vm, dev) == -1) { - PrintError("Could not attach device %s\n", "LNX_VIRTIO_BLK"); - return -1; +static int handle_kick(struct virtio_blk_state * blk_state) { + struct virtio_queue * q = &(blk_state->queue); + + PrintDebug("VIRTIO 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 * hdr_desc = NULL; + struct vring_desc * buf_desc = NULL; + struct vring_desc * status_desc = NULL; + struct blk_op_hdr hdr; + addr_t hdr_addr = 0; + 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; + uint8_t * status_ptr = NULL; + uint8_t status = BLK_STATUS_OK; + uint32_t req_len = 0; + + PrintDebug("Descriptor Count=%d, index=%d\n", desc_cnt, q->cur_avail_idx % QUEUE_SIZE); + + if (desc_cnt < 3) { + PrintError("Block operations must include at least 3 descriptors\n"); + return -1; + } + + hdr_desc = &(q->desc[desc_idx]); + + + PrintDebug("Header Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", hdr_desc, + (void *)(hdr_desc->addr_gpa), hdr_desc->length, hdr_desc->flags, hdr_desc->next); + + if (guest_pa_to_host_va(blk_state->virtio_dev->vm, hdr_desc->addr_gpa, &(hdr_addr)) == -1) { + PrintError("Could not translate block header address\n"); + return -1; + } + + // We copy the block op header out because we are going to modify its contents + memcpy(&hdr, (void *)hdr_addr, sizeof(struct blk_op_hdr)); + + PrintDebug("Blk Op Hdr (ptr=%p) type=%d, sector=%p\n", (void *)hdr_addr, hdr.type, (void *)hdr.sector); + + desc_idx = hdr_desc->next; + + for (i = 0; i < desc_cnt - 2; i++) { + uint8_t tmp_status = BLK_STATUS_OK; + + buf_desc = &(q->desc[desc_idx]); + + PrintDebug("Buffer Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", buf_desc, + (void *)(buf_desc->addr_gpa), buf_desc->length, buf_desc->flags, buf_desc->next); + + if (handle_block_op(blk_state, &hdr, buf_desc, &tmp_status) == -1) { + PrintError("Error handling block operation\n"); + return -1; + } + + if (tmp_status != BLK_STATUS_OK) { + status = tmp_status; + } + + req_len += buf_desc->length; + desc_idx = buf_desc->next; + } + + status_desc = &(q->desc[desc_idx]); + + PrintDebug("Status Descriptor (ptr=%p) gpa=%p, len=%d, flags=%x, next=%d\n", status_desc, + (void *)(status_desc->addr_gpa), status_desc->length, status_desc->flags, status_desc->next); + + if (guest_pa_to_host_va(blk_state->virtio_dev->vm, status_desc->addr_gpa, (addr_t *)&(status_ptr)) == -1) { + PrintError("Could not translate status address\n"); + return -1; + } + + req_len += status_desc->length; + *status_ptr = status; + + 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", blk_state->pci_dev->config_header.intr_line); + v3_pci_raise_irq(blk_state->virtio_dev->pci_bus, 0, blk_state->pci_dev); + blk_state->virtio_cfg.pci_isr = 1; + } + + return 0; +} + +static int virtio_io_write(uint16_t port, void * src, uint_t length, void * private_data) { + struct virtio_blk_state * blk_state = (struct virtio_blk_state *)private_data; + int port_idx = port % blk_state->io_range_size; + + + PrintDebug("VIRTIO BLOCK 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; + } + + blk_state->virtio_cfg.guest_features = *(uint32_t *)src; + PrintDebug("Setting Guest Features to %x\n", blk_state->virtio_cfg.guest_features); + + break; + case VRING_PG_NUM_PORT: + if (length == 4) { + addr_t pfn = *(uint32_t *)src; + addr_t page_addr = (pfn << VIRTIO_PAGE_SHIFT); + + + blk_state->queue.pfn = pfn; + + blk_state->queue.ring_desc_addr = page_addr ; + blk_state->queue.ring_avail_addr = page_addr + (QUEUE_SIZE * sizeof(struct vring_desc)); + blk_state->queue.ring_used_addr = ( blk_state->queue.ring_avail_addr + \ + sizeof(struct vring_avail) + \ + (QUEUE_SIZE * sizeof(uint16_t))); + + // round up to next page boundary. + blk_state->queue.ring_used_addr = (blk_state->queue.ring_used_addr + 0xfff) & ~0xfff; + + if (guest_pa_to_host_va(blk_state->virtio_dev->vm, blk_state->queue.ring_desc_addr, (addr_t *)&(blk_state->queue.desc)) == -1) { + PrintError("Could not translate ring descriptor address\n"); + return -1; + } + + + if (guest_pa_to_host_va(blk_state->virtio_dev->vm, blk_state->queue.ring_avail_addr, (addr_t *)&(blk_state->queue.avail)) == -1) { + PrintError("Could not translate ring available address\n"); + return -1; + } + + + if (guest_pa_to_host_va(blk_state->virtio_dev->vm, blk_state->queue.ring_used_addr, (addr_t *)&(blk_state->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 *)(blk_state->queue.ring_desc_addr), + (void *)(blk_state->queue.ring_avail_addr), + (void *)(blk_state->queue.ring_used_addr)); + + PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n", + blk_state->queue.desc, blk_state->queue.avail, blk_state->queue.used); + + } else { + PrintError("Illegal write length for page frame number\n"); + return -1; + } + break; + case VRING_Q_SEL_PORT: + blk_state->virtio_cfg.vring_queue_selector = *(uint16_t *)src; + + if (blk_state->virtio_cfg.vring_queue_selector != 0) { + PrintError("Virtio Block device only uses 1 queue, selected %d\n", + blk_state->virtio_cfg.vring_queue_selector); + return -1; + } + + break; + case VRING_Q_NOTIFY_PORT: + PrintDebug("Handling Kick\n"); + if (handle_kick(blk_state) == -1) { + PrintError("Could not handle Block Notification\n"); + return -1; + } + break; + case VIRTIO_STATUS_PORT: + blk_state->virtio_cfg.status = *(uint8_t *)src; + + if (blk_state->virtio_cfg.status == 0) { + PrintDebug("Resetting device\n"); + blk_reset(blk_state); + } + + break; + + case VIRTIO_ISR_PORT: + blk_state->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, void * private_data) { + struct virtio_blk_state * blk_state = (struct virtio_blk_state *)private_data; + int port_idx = port % blk_state->io_range_size; + + + PrintDebug("VIRTIO BLOCK 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 = blk_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 = blk_state->queue.pfn; + + break; + case VRING_SIZE_PORT: + if (length != 2) { + PrintError("Illegal read length for vring size\n"); + return -1; + } + + *(uint16_t *)dst = blk_state->queue.queue_size; + + break; + + case VIRTIO_STATUS_PORT: + if (length != 1) { + PrintError("Illegal read length for status\n"); + return -1; + } + + *(uint8_t *)dst = blk_state->virtio_cfg.status; + break; + + case VIRTIO_ISR_PORT: + *(uint8_t *)dst = blk_state->virtio_cfg.pci_isr; + blk_state->virtio_cfg.pci_isr = 0; + v3_pci_lower_irq(blk_state->virtio_dev->pci_bus, 0, blk_state->pci_dev); + break; + + default: + if ( (port_idx >= sizeof(struct virtio_config)) && + (port_idx < (sizeof(struct virtio_config) + sizeof(struct blk_config))) ) { + int cfg_offset = port_idx - sizeof(struct virtio_config); + uint8_t * cfg_ptr = (uint8_t *)&(blk_state->block_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 = virtio_free, + .reset = virtio_reset, + .start = NULL, + .stop = NULL, +}; + + + + + +static int register_dev(struct virtio_dev_state * virtio, struct virtio_blk_state * blk_state) { + // initialize PCI + struct pci_device * pci_dev = NULL; struct v3_pci_bar bars[6]; int num_ports = sizeof(struct virtio_config) + sizeof(struct blk_config); int tmp_ports = num_ports; @@ -115,65 +505,135 @@ static int virtio_init(struct guest_info * vm, void * cfg_data) { // 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 - + blk_state->io_range_size = 1; // must be a power of 2 + while (tmp_ports > 0) { tmp_ports >>= 1; - virtio_state->io_range_size <<= 1; + blk_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; + if ((num_ports & ((blk_state->io_range_size >> 1) - 1)) == 0) { + blk_state->io_range_size >>= 1; } - - + + for (i = 0; i < 6; i++) { bars[i].type = PCI_BAR_NONE; } - + + PrintDebug("Virtio-BLK io_range_size = %d\n", blk_state->io_range_size); + 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, + bars[0].num_ports = blk_state->io_range_size; + + bars[0].io_read = virtio_io_read; + bars[0].io_write = virtio_io_write; + bars[0].private_data = blk_state; + + pci_dev = v3_pci_register_device(virtio->pci_bus, PCI_STD_DEVICE, 0, PCI_AUTO_DEV_NUM, 0, "LNX_VIRTIO_BLK", bars, - NULL, NULL, NULL, dev); - + NULL, NULL, NULL, blk_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_BLOCK_DEV_ID; pci_dev->config_header.class = PCI_CLASS_STORAGE; pci_dev->config_header.subclass = PCI_STORAGE_SUBCLASS_OTHER; pci_dev->config_header.subsystem_id = VIRTIO_BLOCK_SUBDEVICE_ID; + + + pci_dev->config_header.intr_pin = 1; + + pci_dev->config_header.max_latency = 1; // ?? (qemu does it...) + + + blk_state->pci_dev = pci_dev; + + /* Block configuration */ + blk_state->virtio_cfg.host_features = VIRTIO_SEG_MAX; + blk_state->block_cfg.max_seg = QUEUE_SIZE - 2; + // Virtio Block only uses one queue + blk_state->queue.queue_size = QUEUE_SIZE; - pci_dev->config_header.intr_pin = 1; + blk_state->virtio_dev = virtio; - pci_dev->config_header.max_latency = 1; // ?? (qemu does it...) + blk_reset(blk_state); + + + return 0; +} + + +static int connect_fn(struct guest_info * info, + void * frontend_data, + struct v3_dev_blk_ops * ops, + v3_cfg_tree_t * cfg, + void * private_data) { + + struct virtio_dev_state * virtio = (struct virtio_dev_state *)frontend_data; + + struct virtio_blk_state * blk_state = (struct virtio_blk_state *)V3_Malloc(sizeof(struct virtio_blk_state)); + memset(blk_state, 0, sizeof(struct virtio_blk_state)); + + register_dev(virtio, blk_state); + + blk_state->ops = ops; + blk_state->backend_data = private_data; + + blk_state->block_cfg.capacity = ops->get_capacity(private_data); + PrintDebug("Virtio Capacity = %d -- 0x%p\n", (int)(virtio->block_cfg.capacity), + (void *)(addr_t)(virtio->block_cfg.capacity)); - virtio_state->pci_dev = pci_dev; + return 0; +} + + +static int virtio_init(struct guest_info * vm, v3_cfg_tree_t * cfg) { + struct vm_device * pci_bus = v3_find_dev(vm, v3_cfg_val(cfg, "bus")); + struct virtio_dev_state * virtio_state = NULL; + char * name = v3_cfg_val(cfg, "name"); + + PrintDebug("Initializing VIRTIO Block device\n"); + + if (pci_bus == NULL) { + PrintError("VirtIO devices require a PCI Bus"); + return -1; + } + + + virtio_state = (struct virtio_dev_state *)V3_Malloc(sizeof(struct virtio_dev_state)); + memset(virtio_state, 0, sizeof(struct virtio_dev_state)); + + INIT_LIST_HEAD(&(virtio_state->dev_list)); virtio_state->pci_bus = pci_bus; + virtio_state->vm = vm; - /* Block configuration */ + 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; + } + if (v3_dev_add_blk_frontend(vm, name, connect_fn, (void *)virtio_state) == -1) { + PrintError("Could not register %s as block frontend\n", name); + return -1; + } - - return -1; + return 0; }