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

From: Jean-Philippe Brucker
Subject: Re: [Qemu-arm] [RFC v6 15/22] virtio-iommu: Implement fault reporting
Date: Wed, 21 Mar 2018 13:15:43 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

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?


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