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[Qemu-devel] RFC: virtio-rng and /dev/urandom
From: |
Cole Robinson |
Subject: |
[Qemu-devel] RFC: virtio-rng and /dev/urandom |
Date: |
Fri, 15 Apr 2016 06:41:34 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 |
Libvirt currently rejects using host /dev/urandom as an input source for a
virtio-rng device. The only accepted sources are /dev/random and /dev/hwrng.
This is the result of discussions on qemu-devel around when the feature was
first added (2013). Examples:
http://lists.gnu.org/archive/html/qemu-devel/2012-09/msg02387.html
https://lists.gnu.org/archive/html/qemu-devel/2013-03/threads.html#00023
libvirt's rejection of /dev/urandom has generated some complaints from users:
https://bugzilla.redhat.com/show_bug.cgi?id=1074464
* cited: http://www.2uo.de/myths-about-urandom/
http://www.redhat.com/archives/libvir-list/2016-March/msg01062.html
http://www.redhat.com/archives/libvir-list/2016-April/msg00186.html
I think it's worth having another discussion about this, at least with a
recent argument in one place so we can put it to bed. I'm CCing a bunch of
people. I think the questions are:
1) is the original recommendation to never use virtio-rng+/dev/urandom correct?
2) regardless of #1, should we continue to reject that config in libvirt?
Thanks,
Cole
- [Qemu-devel] RFC: virtio-rng and /dev/urandom,
Cole Robinson <=
- Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom, Richard W.M. Jones, 2016/04/15
- Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom, Eric Blake, 2016/04/15
- Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom, Hubert Kario, 2016/04/15
- Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom, H. Peter Anvin, 2016/04/15
- Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom, H. Peter Anvin, 2016/04/15
- Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom, Paolo Bonzini, 2016/04/16
- Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom, H. Peter Anvin, 2016/04/17
- Re: [Qemu-devel] RFC: virtio-rng and /dev/urandom, H. Peter Anvin, 2016/04/17