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[Qemu-devel] [PATCH 0/8] add paravirtualization hwrng support (v2)
From: |
Anthony Liguori |
Subject: |
[Qemu-devel] [PATCH 0/8] add paravirtualization hwrng support (v2) |
Date: |
Tue, 30 Oct 2012 18:02:50 -0500 |
Hi,
This series implements the backend and frontend infrastructure for virtio-rng.
This is similar to previous series sent out by both Amit and myself although
it has been trimmed down considerably.
In terms of backends, a file and EGD backend are supported. The file defaults
to /dev/random based on the feedback from Peter. It's still possible to
support /dev/urandom though as an entropy source by overriding the file name.
v1 -> v2:
- Include default backend patch from separate series
- Add a rate limiting patch
My take away from all of the various discussions on what the Right Way to
use virtio-rng is:
1) /dev/random should always be used as the entropy source (I've left it
configurable though)
2) I think the Right Way to configure virtio-rng is to figure out what the
available entropy is on the host, and then decide how to allocate that
to each guest. As such, I've implemented rate limiting.
I think QEMU is the right place to do this because this is a property of
specific virtual machines. I can imagine a cloud provider wanting to
guarantee a certain level of entropy for different classes of VMs. Even
if rngd could be used to do this, configuring it differently for different
guests would be cumbersome.
3) `qemu -device virtio-rng-pci` will Just Work but risks exhausting host
entropy. This means we can't make it the default for machines. But for
most command line users, I think this is the behavior they want.
- [Qemu-devel] [PATCH 0/8] add paravirtualization hwrng support (v2),
Anthony Liguori <=
- [Qemu-devel] [PATCH 5/8] rng-egd: introduce EGD compliant RNG backend, Anthony Liguori, 2012/10/30
- [Qemu-devel] [PATCH 4/8] rng-random: add an RNG backend that uses /dev/random (v2), Anthony Liguori, 2012/10/30
- [Qemu-devel] [PATCH 3/8] rng: add RndBackend abstract object class, Anthony Liguori, 2012/10/30
- [Qemu-devel] [PATCH 7/8] virtio-rng: add rate limiting support, Anthony Liguori, 2012/10/30
- [Qemu-devel] [PATCH 6/8] virtio-rng: hardware random number generator device, Anthony Liguori, 2012/10/30
- [Qemu-devel] [PATCH 1/8] vl: add -object option to create QOM objects from the command line, Anthony Liguori, 2012/10/30
- [Qemu-devel] [PATCH 8/8] virtio-rng-pci: create a default backend if none exists, Anthony Liguori, 2012/10/30
- [Qemu-devel] [PATCH 2/8] object: add object_property_add_bool (v2), Anthony Liguori, 2012/10/30
- Re: [Qemu-devel] [PATCH 0/8] add paravirtualization hwrng support (v2), H. Peter Anvin, 2012/10/30