linux-kernel - Re: Virt RNG?

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Message-Id: <200805152231.56967.borntraeger@de.ibm.com>
Date:	Thu, 15 May 2008 22:31:56 +0200
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, virtualization@...ts.osdl.org,
	Rusty Russell <rusty@...tcorp.com.au>, jeremy@...source.com,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Avi Kivity <avi@...ranet.com>
Subject: Re: Virt RNG?

Am Donnerstag, 15. Mai 2008 schrieb Jeff Garzik:
> Has anyone yet written a "hw" RNG module for virt, that reads the host's 
> random number pool?
> 
> All this talk[1] about IRQF_SAMPLE_RANDOM in network drivers reminds me 
> that virt guest instances should be grabbing random numbers from the 
> host, especially if the host has a hardware RNG.

Yes, there was a drivers/char/hw_random/virtio-rng.c in Rusty's lguest 
repository. 
http://www.mail-archive.com/virtualization%40lists.linux-foundation.org/msg02902.html

I have tested this driver with this fix
https://lists.linux-foundation.org/pipermail/virtualization/2008-January/009737.html
and it worked.
As it transfers only 4 byte per hypercall it is not mindblowingly fast, but I 
guess it is fast enough.

Dont know why it never hit mainline.

Christian

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