4 * Copyright IBM, Corp. 2007
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #ifndef _QEMU_VIRTIO_BLK_H
15 #define _QEMU_VIRTIO_BLK_H
17 #include "hw/virtio/virtio.h"
18 #include "hw/block/block.h"
20 #define TYPE_VIRTIO_BLK "virtio-blk-device"
21 #define VIRTIO_BLK(obj) \
22 OBJECT_CHECK(VirtIOBlock, (obj), TYPE_VIRTIO_BLK)
24 /* from Linux's linux/virtio_blk.h */
26 /* The ID for virtio_block */
27 #define VIRTIO_ID_BLOCK 2
30 #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
31 #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
32 #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */
33 #define VIRTIO_BLK_F_GEOMETRY 4 /* Indicates support of legacy geometry */
34 #define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
35 #define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/
36 #define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */
37 /* #define VIRTIO_BLK_F_IDENTIFY 8 ATA IDENTIFY supported, DEPRECATED */
38 #define VIRTIO_BLK_F_WCE 9 /* write cache enabled */
39 #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */
40 #define VIRTIO_BLK_F_CONFIG_WCE 11 /* write cache configurable */
42 #define VIRTIO_BLK_ID_BYTES 20 /* ID string length */
44 struct virtio_blk_config
53 uint8_t physical_block_exp
;
54 uint8_t alignment_offset
;
60 /* These two define direction. */
61 #define VIRTIO_BLK_T_IN 0
62 #define VIRTIO_BLK_T_OUT 1
64 /* This bit says it's a scsi command, not an actual read or write. */
65 #define VIRTIO_BLK_T_SCSI_CMD 2
67 /* Flush the volatile write cache */
68 #define VIRTIO_BLK_T_FLUSH 4
70 /* return the device ID string */
71 #define VIRTIO_BLK_T_GET_ID 8
73 /* Barrier before this op. */
74 #define VIRTIO_BLK_T_BARRIER 0x80000000
76 /* This is the first element of the read scatter-gather list. */
77 struct virtio_blk_outhdr
83 /* Sector (ie. 512 byte offset) */
87 #define VIRTIO_BLK_S_OK 0
88 #define VIRTIO_BLK_S_IOERR 1
89 #define VIRTIO_BLK_S_UNSUPP 2
91 /* This is the last element of the write scatter-gather list */
92 struct virtio_blk_inhdr
97 /* SCSI pass-through header */
98 struct virtio_scsi_inhdr
115 struct VirtIOBlockDataPlane
;
117 typedef struct VirtIOBlock
{
118 VirtIODevice parent_obj
;
119 BlockDriverState
*bs
;
125 unsigned short sector_mask
;
127 VMChangeStateEntry
*change
;
128 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
129 Notifier migration_state_notifier
;
130 struct VirtIOBlockDataPlane
*dataplane
;
134 #define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \
135 DEFINE_VIRTIO_COMMON_FEATURES(_state, _field)
138 #define DEFINE_VIRTIO_BLK_PROPERTIES(_state, _field) \
139 DEFINE_BLOCK_PROPERTIES(_state, _field.conf), \
140 DEFINE_BLOCK_CHS_PROPERTIES(_state, _field.conf), \
141 DEFINE_PROP_STRING("serial", _state, _field.serial), \
142 DEFINE_PROP_BIT("config-wce", _state, _field.config_wce, 0, true), \
143 DEFINE_PROP_BIT("scsi", _state, _field.scsi, 0, true)
145 #define DEFINE_VIRTIO_BLK_PROPERTIES(_state, _field) \
146 DEFINE_BLOCK_PROPERTIES(_state, _field.conf), \
147 DEFINE_BLOCK_CHS_PROPERTIES(_state, _field.conf), \
148 DEFINE_PROP_STRING("serial", _state, _field.serial), \
149 DEFINE_PROP_BIT("config-wce", _state, _field.config_wce, 0, true)
150 #endif /* __linux__ */
152 void virtio_blk_set_conf(DeviceState
*dev
, VirtIOBlkConf
*blk
);