/* * Virtio Block Device * * Copyright IBM, Corp. 2007 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #ifndef _QEMU_VIRTIO_BLK_H #define _QEMU_VIRTIO_BLK_H #include "virtio.h" #include "block.h" #include "pci.h" /* from Linux's linux/virtio_blk.h */ /* The ID for virtio_block */ #define VIRTIO_ID_BLOCK 2 /* Feature bits */ #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ #define VIRTIO_BLK_F_GEOMETRY 4 /* Indicates support of legacy geometry */ struct virtio_blk_config { uint64_t capacity; uint32_t size_max; uint32_t seg_max; uint16_t cylinders; uint8_t heads; uint8_t sectors; } __attribute__((packed)); /* These two define direction. */ #define VIRTIO_BLK_T_IN 0 #define VIRTIO_BLK_T_OUT 1 /* This bit says it's a scsi command, not an actual read or write. */ #define VIRTIO_BLK_T_SCSI_CMD 2 /* Barrier before this op. */ #define VIRTIO_BLK_T_BARRIER 0x80000000 /* This is the first element of the read scatter-gather list. */ struct virtio_blk_outhdr { /* VIRTIO_BLK_T* */ uint32_t type; /* io priority. */ uint32_t ioprio; /* Sector (ie. 512 byte offset) */ uint64_t sector; }; #define VIRTIO_BLK_S_OK 0 #define VIRTIO_BLK_S_IOERR 1 #define VIRTIO_BLK_S_UNSUPP 2 /* This is the first element of the write scatter-gather list */ struct virtio_blk_inhdr { unsigned char status; }; void *virtio_blk_init(PCIBus *bus, BlockDriverState *bs); #endif