blob: ac52d7c176e7685450a489f5e602eeccc776fb0e [file] [log] [blame]
/*
* 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
};