From a122ab24725c0392d4f53105aff343e703119fbe Mon Sep 17 00:00:00 2001 From: Greg Kurz Date: Fri, 5 Feb 2016 11:45:40 +0100 Subject: virtio: move cross-endian helper to vhost If target is bi-endian (ppc64, arm), the virtio_legacy_is_cross_endian() indeed returns the runtime state of the virtio device. However, it returns false unconditionally in the general case. This sounds a bit strange given the name of the function. This helper is only useful for vhost actually, where indeed non bi-endian targets don't have to deal with cross-endian issues. This patch moves the helper to vhost.c and gives it a more appropriate name. Reviewed-by: Cornelia Huck Reviewed-by: Laurent Vivier Signed-off-by: Greg Kurz Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: Laurent Vivier --- hw/virtio/vhost.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) (limited to 'hw/virtio') diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 7dff75547d..6fea07c8ae 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -749,6 +749,19 @@ static void vhost_log_stop(MemoryListener *listener, /* FIXME: implement */ } +static inline bool vhost_needs_vring_endian(VirtIODevice *vdev) +{ +#ifdef TARGET_IS_BIENDIAN +#ifdef HOST_WORDS_BIGENDIAN + return !virtio_is_big_endian(vdev); +#else + return virtio_is_big_endian(vdev); +#endif +#else + return false; +#endif +} + static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev *dev, bool is_big_endian, int vhost_vq_index) @@ -800,7 +813,7 @@ static int vhost_virtqueue_start(struct vhost_dev *dev, } if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && - virtio_legacy_is_cross_endian(vdev)) { + vhost_needs_vring_endian(vdev)) { r = vhost_virtqueue_set_vring_endian_legacy(dev, virtio_is_big_endian(vdev), vhost_vq_index); @@ -897,7 +910,7 @@ static void vhost_virtqueue_stop(struct vhost_dev *dev, * native as legacy devices expect so by default. */ if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && - virtio_legacy_is_cross_endian(vdev)) { + vhost_needs_vring_endian(vdev)) { r = vhost_virtqueue_set_vring_endian_legacy(dev, !virtio_is_big_endian(vdev), vhost_vq_index); -- cgit v1.2.3