Re: [Qemu-devel] [RFC v6 15/22] virtio-iommu: Implement fault reporting

[Jean-Philippe Brucker]

Hi Eric,

On 12/02/18 18:58, Eric Auger wrote:
[...]
> +    for (;;) {
> +        elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
> +
> +        if (!elem) {
> +            virtio_error(vdev,
> +                         "no buffer available in event queue to report 
> event");
> +            return;
> +        }

When $user attempts something silly like trying VFIO without the VFIO
patches, this outputs thousands of messages per second... I guess it would
also happen if the driver isn't consuming error reports fast enough. Is
there a simple way of ratelimiting printfs so the context of the error
doesn't get washed away?

Thanks,
Jean