ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 20:51:03 +02:00
Code Issues Packages Projects Releases Wiki Activity

virtio: add explicit big-endian support to memory accessors

Browse Source 
The current memory accessors logic is:
- little endian if little_endian
- native endian (i.e. no byteswap) if !little_endian

If we want to fully support cross-endian vhost, we also need to be
able to convert to big endian.

Instead of changing the little_endian argument to some 3-value enum, this
patch changes the logic to:
- little endian if little_endian
- big endian if !little_endian

The native endian case is handled by all users with a trivial helper. This
patch doesn't change any functionality, nor it does add overhead.

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz
2015-04-24 14:26:24 +02:00
committed by Michael S. Tsirkin
parent ab27c07f60
commit 7d82410950
6 changed files with 24 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/virtio_config.h
View File

@@ -207,7 +207,8 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu)
static inline bool virtio_is_little_endian(struct virtio_device *vdev)
{
return virtio_has_feature(vdev, VIRTIO_F_VERSION_1);
return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
virtio_legacy_is_little_endian();
}
/* Memory accessors */