40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
|
/*
|
||
|
|
* Virtio Block Device common helpers
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "qemu/osdep.h"
|
||
|
|
|
||
|
|
#include "standard-headers/linux/virtio_blk.h"
|
||
|
|
#include "hw/virtio/virtio.h"
|
||
|
|
#include "hw/virtio/virtio-blk-common.h"
|
||
|
|
|
||
|
|
/* Config size before the discard support (hide associated config fields) */
|
||
|
|
#define VIRTIO_BLK_CFG_SIZE offsetof(struct virtio_blk_config, \
|
||
|
|
max_discard_sectors)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Starting from the discard feature, we can use this array to properly
|
||
|
|
* set the config size depending on the features enabled.
|
||
|
|
*/
|
||
|
|
static const VirtIOFeature feature_sizes[] = {
|
||
|
|
{.flags = 1ULL << VIRTIO_BLK_F_DISCARD,
|
||
|
|
.end = endof(struct virtio_blk_config, discard_sector_alignment)},
|
||
|
|
{.flags = 1ULL << VIRTIO_BLK_F_WRITE_ZEROES,
|
||
|
|
.end = endof(struct virtio_blk_config, write_zeroes_may_unmap)},
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
|
||
|
|
const VirtIOConfigSizeParams virtio_blk_cfg_size_params = {
|
||
|
|
.min_size = VIRTIO_BLK_CFG_SIZE,
|
||
|
|
.max_size = sizeof(struct virtio_blk_config),
|
||
|
|
.feature_sizes = feature_sizes
|
||
|
|
};
|