On Fri, Apr 24, 2015 at 02:27:24PM +0200, Greg Kurz wrote: > This patch brings cross-endian support to vhost when used to implement > legacy virtio devices. Since it is a relatively rare situation, the > feature availability is controlled by a kernel config option (not set > by default). > > The vq->is_le boolean field is added to cache the endianness to be > used for ring accesses. It defaults to native endian, as expected > by legacy virtio devices. When the ring gets active, we force little > endian if the device is modern. When the ring is deactivated, we > revert to the native endian default. > > If cross-endian was compiled in, a vq->user_be boolean field is added > so that userspace may request a specific endianness. This field is > used to override the default when activating the ring of a legacy > device. It has no effect on modern devices. > > Signed-off-by: Greg Kurz <gkurz@xxxxxxxxxxxxxxxxxx> Reviewed-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx> -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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