On Wed, May 18, 2016 at 02:12:43PM +0200, Cornelia Huck wrote:
> As virtio-1 devices use little endian on their queues, we need
> to make sure the pfns are in virtio32 format before we put
> them on the queue.
>
> Signed-off-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
I have a less hacky version that I was testing.
Will post now.
> ---
> drivers/virtio/virtio_balloon.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> index 7b6d74f..89da06c 100644
> --- a/drivers/virtio/virtio_balloon.c
> +++ b/drivers/virtio/virtio_balloon.c
> @@ -76,6 +76,7 @@ struct virtio_balloon {
> /* The array of pfns we tell the Host about. */
> unsigned int num_pfns;
> u32 pfns[VIRTIO_BALLOON_ARRAY_PFNS_MAX];
> + __virtio32 vpfns[VIRTIO_BALLOON_ARRAY_PFNS_MAX];
>
> /* Memory statistics */
> struct virtio_balloon_stat stats[VIRTIO_BALLOON_S_NR];
> @@ -115,8 +116,11 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq)
> {
> struct scatterlist sg;
> unsigned int len;
> + int i;
>
> - sg_init_one(&sg, vb->pfns, sizeof(vb->pfns[0]) * vb->num_pfns);
> + for (i = 0; i < vb->num_pfns; i++)
> + vb->vpfns[i] = cpu_to_virtio32(vb->vdev, vb->pfns[i]);
> + sg_init_one(&sg, vb->vpfns, sizeof(vb->vpfns[0]) * vb->num_pfns);
>
> /* We should always be able to add one buffer to an empty queue. */
> virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL);
> --
> 2.6.6
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