qemu

FORK: QEMU emulator
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virtio-blk-common.c (1221B)

      1 /*
      2  * Virtio Block Device common helpers
      3  *
      4  * Copyright IBM, Corp. 2007
      5  *
      6  * Authors:
      7  *  Anthony Liguori   <aliguori@us.ibm.com>
      8  *
      9  * This work is licensed under the terms of the GNU GPL, version 2.  See
     10  * the COPYING file in the top-level directory.
     11  */
     12 
     13 #include "qemu/osdep.h"
     14 
     15 #include "standard-headers/linux/virtio_blk.h"
     16 #include "hw/virtio/virtio.h"
     17 #include "hw/virtio/virtio-blk-common.h"
     18 
     19 /* Config size before the discard support (hide associated config fields) */
     20 #define VIRTIO_BLK_CFG_SIZE offsetof(struct virtio_blk_config, \
     21                                      max_discard_sectors)
     22 
     23 /*
     24  * Starting from the discard feature, we can use this array to properly
     25  * set the config size depending on the features enabled.
     26  */
     27 static const VirtIOFeature feature_sizes[] = {
     28     {.flags = 1ULL << VIRTIO_BLK_F_DISCARD,
     29      .end = endof(struct virtio_blk_config, discard_sector_alignment)},
     30     {.flags = 1ULL << VIRTIO_BLK_F_WRITE_ZEROES,
     31      .end = endof(struct virtio_blk_config, write_zeroes_may_unmap)},
     32     {}
     33 };
     34 
     35 const VirtIOConfigSizeParams virtio_blk_cfg_size_params = {
     36     .min_size = VIRTIO_BLK_CFG_SIZE,
     37     .max_size = sizeof(struct virtio_blk_config),
     38     .feature_sizes = feature_sizes
     39 };