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SubjectRe: [PATCH] virtio_balloon: disable VIOMMU support
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On 2017年06月14日 02:00, Michael S. Tsirkin wrote:
> virtio balloon bypasses the DMA API entirely so does not support the
> VIOMMU right now. It's not clear we need that support, for now let's
> just make sure we don't pretend to support it.
>
> Cc: stable@vger.kernel.org
> Cc: Wei Wang <wei.w.wang@intel.com>
> Fixes: 1a937693993f ("virtio: new feature to detect IOMMU device quirk")
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> drivers/virtio/virtio_balloon.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> index 408c174..22caf80 100644
> --- a/drivers/virtio/virtio_balloon.c
> +++ b/drivers/virtio/virtio_balloon.c
> @@ -663,6 +663,12 @@ static int virtballoon_restore(struct virtio_device *vdev)
> }
> #endif
>
> +static int virtballoon_validate(struct virtio_device *vdev)
> +{
> + __virtio_clear_bit(vdev, VIRTIO_F_IOMMU_PLATFORM);
> + return 0;
> +}
> +
> static unsigned int features[] = {
> VIRTIO_BALLOON_F_MUST_TELL_HOST,
> VIRTIO_BALLOON_F_STATS_VQ,
> @@ -675,6 +681,7 @@ static struct virtio_driver virtio_balloon_driver = {
> .driver.name = KBUILD_MODNAME,
> .driver.owner = THIS_MODULE,
> .id_table = id_table,
> + .validate = virtballoon_validate,
> .probe = virtballoon_probe,
> .remove = virtballoon_remove,
> .config_changed = virtballoon_changed,

Acked-by: Jason Wang <jasowang@redhat.com>

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