On Fri, 24 Apr 2015 14:27:24 +0200 Greg Kurz <[email protected]> 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 <[email protected]> > --- > > Changes since v5: > - fixed description in Kconfig > - fixed error description in uapi header > - dropped useless semi-colon in the vhost_vq_reset_user_be() stub > > drivers/vhost/Kconfig | 15 ++++++++ > drivers/vhost/vhost.c | 85 > +++++++++++++++++++++++++++++++++++++++++++- > drivers/vhost/vhost.h | 11 +++++- > include/uapi/linux/vhost.h | 14 +++++++ > 4 files changed, 122 insertions(+), 3 deletions(-) > Reviewed-by: Cornelia Huck <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
