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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 /include/linux/vringh.h
parentab27c07f607253f928cbc8c64d9c0d273df09e6b (diff)
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 'include/linux/vringh.h')
-rw-r--r--include/linux/vringh.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/vringh.h b/include/linux/vringh.h
index 3ed62efc2bc5..bc6c28d04263 100644
--- a/include/linux/vringh.h
+++ b/include/linux/vringh.h
@@ -228,7 +228,8 @@ static inline void vringh_notify(struct vringh *vrh)
static inline bool vringh_is_little_endian(const struct vringh *vrh)
{
- return vrh->little_endian;
+ return vrh->little_endian ||
+ virtio_legacy_is_little_endian();
}
static inline u16 vringh16_to_cpu(const struct vringh *vrh, __virtio16 val)