From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Xen-devel] [RFC] Hypervisor RNG and enumeration
Date: Thu, 30 Oct 2014 13:25:42 +0100
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To: David Vrabel <david.vrabel@citrix.com>, Andy Lutomirski <luto@amacapital.net>, Linux Virtualization <virtualization@lists.linux-foundation.org>
Cc: Mathew John <mathewj@microsoft.com>, Theodore Ts'o <tytso@mit.edu>, Jim Mattson <jmattson@vmware.com>, kvm list <kvm@vger.kernel.org>, Gleb Natapov <gleb@kernel.org>, Niels Ferguson <niels@microsoft.com>, David Hepkin <davidhep@microsoft.com>, Doug Covelli <dcovelli@vmware.com>, "H. Peter Anvin" <hpa@zytor.com>, Jake Oshins <jakeo@microsoft.com>, xen-devel@lists.xenproject.org, Alok Kataria <akataria@vmware.com>, John Starks <John.Starks@microsoft.com>
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On 10/30/2014 01:21 PM, David Vrabel wrote:
> I would add:
> 
>   If the hypervisor's pool of random data is exhausted, it MAY
>   return 0.  The hypervisor MUST provide at least 4 (?) non-zero
>   numbers to each guest.

Mandating "non-zero numbers" sounds like a bad idea.  Just use the RNG
for what it was designed; returning non-random numbers will not be a
problem.

Paolo