On Thu, 11 Dec 2014 14:25:14 +0100
Cornelia Huck <cornelia.huck@xxxxxxxxxx> wrote:
> For virtio-1 devices, the driver must not attempt to set feature bits
> after it set FEATURES_OK in the device status. Simply reject it in
> that case.
>
> Signed-off-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
> ---
> hw/virtio/virtio.c | 16 ++++++++++++++--
> include/hw/virtio/virtio.h | 2 ++
> 2 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
> index 57190ba..a3dd67b 100644
> --- a/hw/virtio/virtio.c
> +++ b/hw/virtio/virtio.c
> @@ -978,7 +978,7 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
> vmstate_save_state(f, &vmstate_virtio, vdev);
> }
>
> -int virtio_set_features(VirtIODevice *vdev, uint64_t val)
> +static int __virtio_set_features(VirtIODevice *vdev, uint64_t val)
Maybe avoid the double underscores here? But unfortunately, I also fail
to come up with a better suggestion for a name here ...
> {
> BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
> VirtioBusClass *vbusk = VIRTIO_BUS_GET_CLASS(qbus);
> @@ -994,6 +994,18 @@ int virtio_set_features(VirtIODevice *vdev, uint64_t val)
> return bad ? -1 : 0;
> }
>
> +int virtio_set_features(VirtIODevice *vdev, uint64_t val)
> +{
> + /*
> + * The driver must not attempt to set features after feature negotiation
> + * has finished.
> + */
> + if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) {
> + return -EINVAL;
> + }
Hmm, according to your patch description, the FEATURES_OK check only
applies to virtio-1.0 devices ... so shouldn't there be a check for
virtio-1 here? Or did I miss something?
> + return __virtio_set_features(vdev, val);
> +}
Thomas
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