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Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom

From: H. Peter Anvin
Subject: Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom
Date: Fri, 15 Apr 2016 08:56:59 -0700
User-agent: K-9 Mail for Android

On April 15, 2016 3:41:34 AM PDT, Cole Robinson <address@hidden> wrote:
>Libvirt currently rejects using host /dev/urandom as an input source
>for a
>virtio-rng device. The only accepted sources are /dev/random and
>This is the result of discussions on qemu-devel around when the feature
>first added (2013). Examples:
>libvirt's rejection of /dev/urandom has generated some complaints from
>* cited: http://www.2uo.de/myths-about-urandom/
>I think it's worth having another discussion about this, at least with
>recent argument in one place so we can put it to bed. I'm CCing a bunch
>people. I think the questions are:
>1) is the original recommendation to never use virtio-rng+/dev/urandom
>2) regardless of #1, should we continue to reject that config in

Using /dev/urandom for virtio-rng, *except* perhaps for a small seed, it a 
complete waste of cycles.  There is absolutely no reason to have one prng feed 
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