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authorGreg Kurz <gkurz@linux.vnet.ibm.com>2015-04-24 14:26:24 +0200
committerMichael S. Tsirkin <mst@redhat.com>2015-06-01 15:48:54 +0200
commit7d82410950aa74adccf035c332e409af2bb93e92 (patch)
treeff910c555820a2bf0fbd7b17231fa75d0cea5427 /drivers/vhost
parentab27c07f607253f928cbc8c64d9c0d273df09e6b (diff)
downloadop-kernel-dev-7d82410950aa74adccf035c332e409af2bb93e92.zip
op-kernel-dev-7d82410950aa74adccf035c332e409af2bb93e92.tar.gz
virtio: add explicit big-endian support to memory accessors
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>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vhost.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 6a49960..a4fa33a 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -175,7 +175,8 @@ static inline bool vhost_has_feature(struct vhost_virtqueue *vq, int bit)
static inline bool vhost_is_little_endian(struct vhost_virtqueue *vq)
{
- return vhost_has_feature(vq, VIRTIO_F_VERSION_1);
+ return vhost_has_feature(vq, VIRTIO_F_VERSION_1) ||
+ virtio_legacy_is_little_endian();
}
/* Memory accessors */
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