linux-kernel - Re: [PATCH 3/3] KVM: PPC: Book3S: Add support for hwrng found on some powernv systems

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Date:	Thu, 03 Oct 2013 17:22:59 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	Alexander Graf <agraf@...e.de>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <michael@...erman.id.au>,
	linux-kernel@...r.kernel.org, mpm@...enic.com,
	herbert@...dor.hengli.com.au, linuxppc-dev@...abs.org,
	kvm@...r.kernel.org, kvm-ppc@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH 3/3] KVM: PPC: Book3S: Add support for hwrng found on
 some powernv systems

On Thu, 2013-10-03 at 08:43 +0300, Gleb Natapov wrote:
> Why it can be a bad idea? User can drain hwrng continuously making other
> users of it much slower, or even worse, making them fall back to another
> much less reliable, source of entropy.

Not in a very significant way, we generate entropy at 1Mhz after all, which
is pretty good.

Cheers,
Ben.


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