X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fdevices%2Flnx_virtio_blk.c;h=0720e933f181bf0de23d55ef84a280a7f4db13e6;hb=f7bc654c609c9780d52f6fa980de987ddd337416;hp=5eefbf832ed8e8de0cb1fee48c7c09dfb120d620;hpb=fd7198bbcdc5240b8f8545741787e51fd69da12a;p=palacios.git diff --git a/palacios/src/devices/lnx_virtio_blk.c b/palacios/src/devices/lnx_virtio_blk.c index 5eefbf8..0720e93 100644 --- a/palacios/src/devices/lnx_virtio_blk.c +++ b/palacios/src/devices/lnx_virtio_blk.c @@ -18,13 +18,40 @@ */ #include - +#include #include - +#include +#include +#include #include +/* +#ifndef 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 +63,13 @@ 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? */ @@ -45,86 +79,443 @@ struct blk_config { + 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; + int ret = -1; + + 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"); + + ret = virtio->hd_ops->read(buf, len / HD_SECTOR_SIZE, *sector, virtio->backend_data); + + *sector += len / HD_SECTOR_SIZE; + + } 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; + } + + ret = virtio->cd_ops->read(buf, len / ATAPI_BLOCK_SIZE, *sector , virtio->backend_data); + + *sector += len / ATAPI_BLOCK_SIZE; + } + + return ret; +} + + +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; + int ret = -1; + + 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"); + + ret = virtio->hd_ops->write(buf, len / HD_SECTOR_SIZE, *sector, virtio->backend_data); + + *sector += len / HD_SECTOR_SIZE; + } + + return ret; +} + + + +// multiple block operations need to increment the sector + +static int handle_block_op(struct vm_device * dev, struct blk_op_hdr * hdr, + struct vring_desc * buf_desc, uint8_t * status) { + struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data; + uint8_t * buf = NULL; + + PrintDebug("Handling Block op\n"); + + + + 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; + } + + + PrintDebug("Sector=%p Length=%d\n", (void *)(addr_t)(hdr->sector), buf_desc->length); + + 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; + return -1; + } 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; + return -1; + } else { + *status = BLK_STATUS_OK; + } + + } else { + *status = BLK_STATUS_NOT_SUPPORTED; + } + + } 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; + + 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_blk_state * virtio = (struct virtio_blk_state *)dev->private_data; + struct virtio_queue * q = &(virtio->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(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(dev, &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(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", virtio->pci_dev->config_header.intr_line); + v3_pci_raise_irq(virtio->pci_bus, 0, virtio->pci_dev); + virtio->virtio_cfg.pci_isr = 1; + } + + return 0; +} static int virtio_io_write(uint16_t port, void * src, uint_t length, struct vm_device * dev) { - struct virtio_device * virtio_dev = find_virtio_dev(dev); + struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data; int port_idx = port % virtio->io_range_size; - uint8_t * cfg_ptr = (uint8_t *)cfg; + PrintDebug("VIRTIO BLOCK Write for port %d (index=%d) len=%d, value=%x\n", port, port_idx, length, *(uint32_t *)src); - switch (port_index) { + 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; + PrintDebug("Setting Guest Features to %x\n", virtio->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); + + + 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_addr=%p, Avail_addr=%p, Used_addr=%p\n", + (void *)(virtio->queue.ring_desc_addr), + (void *)(virtio->queue.ring_avail_addr), + (void *)(virtio->queue.ring_used_addr)); + + PrintDebug("RingDesc=%p, Avail=%p, Used=%p\n", + virtio->queue.desc, virtio->queue.avail, virtio->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 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 VRING_STATUS_PORT: - if (cfg->status == 0) { + 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; + + 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 blk_state * virtio = (struct blk_state *)dev->private_data; + struct virtio_blk_state * virtio = (struct virtio_blk_state *)dev->private_data; int port_idx = port % virtio->io_range_size; - uint8_t * cfg_ptr = (uint8_t *)cfg; + PrintDebug("VIRTIO BLOCK Read for port %d (index =%d), length=%d\n", port, port_idx, length); switch (port_idx) { - // search for device.... - // call and return dev config read - default: - return -1; - } + 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; + } - return length; -} + *(uint32_t *)dst = virtio->queue.pfn; -struct v3_dev_ops = { - .free = virtio_free, - .reset = NULL, - .stop = NULL, - .start = NULL -}; + 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; -static int virtio_free(struct vm_device * dev) { - return -1; + 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 blk_config))) ) { + int cfg_offset = port_idx - sizeof(struct virtio_config); + uint8_t * cfg_ptr = (uint8_t *)&(virtio->block_cfg); + + memcpy(dst, cfg_ptr + cfg_offset, length); + + } else { + PrintError("Read of Unhandled Virtio Read\n"); + return -1; + } + + break; + } + + return length; } @@ -140,6 +531,34 @@ static struct v3_device_ops dev_ops = { +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); + + PrintDebug("Virtio Capacity = %d -- 0x%p\n", (int)(virtio->block_cfg.capacity), + (void *)(addr_t)(virtio->block_cfg.capacity)); + + return 0; +} + static int virtio_init(struct guest_info * vm, void * cfg_data) { @@ -194,6 +613,8 @@ static int virtio_init(struct guest_info * vm, void * cfg_data) { bars[i].type = PCI_BAR_NONE; } + PrintDebug("Virtio-BLK io_range_size = %d\n", virtio_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; @@ -229,10 +650,23 @@ 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_state->block_cfg.max_seg = QUEUE_SIZE - 2; + + // 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; }