linux-kernel - Re: [PATCH 2/2] lguest: virtio-rng support

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Message-Id: <200805191905.11452.rusty@rustcorp.com.au>
Date:	Mon, 19 May 2008 19:05:10 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Theodore Tso <tytso@....edu>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Jeff Garzik <jeff@...zik.org>,
	LKML <linux-kernel@...r.kernel.org>,
	virtualization@...ts.linux-foundation.org,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Matt Mackall <mpm@...enic.com>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: [PATCH 2/2] lguest: virtio-rng support

On Saturday 17 May 2008 17:47:01 Jeremy Fitzhardinge wrote:
> But the host->guest protocol should include the number of bits estimated
> entropy along with the bits themselves.

If we go down that path, we have to come up with a way of feeding that 
information to guest userspace.  Patches welcome.  If we meanwhile assume 
entropy == #bits, it fits the current /dev/hwrng model, and we can add an 
entropy count later if we want to change that.

I'll change my lguest implementation to suck from /dev/random, since noone 
else seems to consider its depletion to be a real issue.  It's no worse than 
what any other process can do.

Thanks,
Rusty.
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