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author | Greg Kurz <gkurz@linux.vnet.ibm.com> | 2015-04-24 14:26:24 +0200 |
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committer | Michael S. Tsirkin <mst@redhat.com> | 2015-06-01 15:48:54 +0200 |
commit | 7d82410950aa74adccf035c332e409af2bb93e92 (patch) | |
tree | ff910c555820a2bf0fbd7b17231fa75d0cea5427 /include/linux/vringh.h | |
parent | ab27c07f607253f928cbc8c64d9c0d273df09e6b (diff) | |
download | linux-stable-7d82410950aa74adccf035c332e409af2bb93e92.tar.gz linux-stable-7d82410950aa74adccf035c332e409af2bb93e92.tar.bz2 linux-stable-7d82410950aa74adccf035c332e409af2bb93e92.zip |
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.h | 3 |
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) |