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Date: Thu, 07 Aug 2014 12:31:11 -0700 From: "H. Peter Anvin" <hpa@...ux.intel.com> To: Amit Shah <amit.shah@...hat.com>, jgarzik@...pay.com CC: Virtualization List <virtualization@...ts.linux-foundation.org>, Amos Kong <akong@...hat.com>, Rusty Russell <rusty@...tcorp.com.au>, linux-kernel@...r.kernel.org, Ricardo Neri <ricardo.neri-calderon@...ux.intel.com> Subject: Re: [PATCH 1/2] rngd: add udev rule to source from hwrng if virtio-rng present On 08/07/2014 06:08 AM, Amit Shah wrote: > On KVM guests where the virtio-rng device is available, and set as the > current rng, this udev rule will start rngd which will feed in the > host-provided entropy to /dev/random. > > Signed-off-by: Amit Shah <amit.shah@...hat.com> > --- > 90-virtio-rng.rules | 1 + > 1 file changed, 1 insertion(+) > create mode 100644 90-virtio-rng.rules > > diff --git a/90-virtio-rng.rules b/90-virtio-rng.rules > new file mode 100644 > index 0000000..07f2f9c > --- /dev/null > +++ b/90-virtio-rng.rules > @@ -0,0 +1 @@ > +KERNEL=="hw_random", ATTR{rng_current}=="virtio*", RUN+="/sbin/rngd -r /dev/hwrng" > I'm not sure this is really right. rngd can receive input from a number of sources, and I suspect it would be better to rngd to be started much earlier and perhaps get sent a SIGHUP to reconfigure when a hw_random device appears ... not just the virtio one. Currently rngd exits if there is no daemon. There are a few ways to deal with that: one is to run rngd on changes and leave a pid file around; the rngd can try to signal the old rngd or launch itself; another option would be to have a different rngd for each source. To some degree the above is obsolete when we get khwrngd widely deployed, but that is a new-kernel-only kind of thing. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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