/* * 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 "standard-headers/linux/virtio_blk.h" #include "hw/virtio/virtio.h" #include "hw/block/block.h" #include "sysemu/iothread.h" #include "sysemu/block-backend.h" #include "qom/object.h" #define TYPE_VIRTIO_BLK "virtio-blk-device" OBJECT_DECLARE_SIMPLE_TYPE(VirtIOBlock, VIRTIO_BLK) /* This is the last element of the write scatter-gather list */ struct virtio_blk_inhdr { unsigned char status; }; #define VIRTIO_BLK_AUTO_NUM_QUEUES UINT16_MAX struct VirtIOBlkConf { BlockConf conf; IOThread *iothread; char *serial; uint32_t request_merging; uint16_t num_queues; uint16_t queue_size; bool seg_max_adjust; uint32_t max_discard_sectors; uint32_t max_write_zeroes_sectors; bool x_enable_wce_if_config_wce; }; struct VirtIOBlockDataPlane; struct VirtIOBlockReq; struct VirtIOBlock { VirtIODevice parent_obj; BlockBackend *blk; void *rq; QEMUBH *bh; VirtIOBlkConf conf; unsigned short sector_mask; bool original_wce; VMChangeStateEntry *change; bool dataplane_disabled; bool dataplane_started; struct VirtIOBlockDataPlane *dataplane; uint64_t host_features; size_t config_size; }; typedef struct VirtIOBlockReq { VirtQueueElement elem; int64_t sector_num; VirtIOBlock *dev; VirtQueue *vq; IOVDiscardUndo inhdr_undo; IOVDiscardUndo outhdr_undo; struct virtio_blk_inhdr *in; struct virtio_blk_outhdr out; QEMUIOVector qiov; size_t in_len; struct VirtIOBlockReq *next; struct VirtIOBlockReq *mr_next; BlockAcctCookie acct; } VirtIOBlockReq; #define VIRTIO_BLK_MAX_MERGE_REQS 32 typedef struct MultiReqBuffer { VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS]; unsigned int num_reqs; bool is_write; } MultiReqBuffer; bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq); void virtio_blk_process_queued_requests(VirtIOBlock *s, bool is_bh); #endif