linux-kernel - Re: [PATCH 0/4] random,x86,kvm: Add and use MSR_KVM_GET_RNG

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Message-ID: <20140716145322.GX18167@minantech.com>
Date:	Wed, 16 Jul 2014 17:53:22 +0300
From:	Gleb Natapov <gleb@...nel.org>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	kvm list <kvm@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Theodore Ts'o <tytso@....edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Subject: Re: [PATCH 0/4] random,x86,kvm: Add and use MSR_KVM_GET_RNG_SEED

On Wed, Jul 16, 2014 at 04:32:19PM +0200, Paolo Bonzini wrote:
> Il 16/07/2014 16:07, Andy Lutomirski ha scritto:
> >This patch has nothing whatsoever to do with how much I trust the CPU
> >vs the hypervisor.  It's for the enormous installed base of machines
> >without RDRAND.
> 
> Ok.  I think an MSR is fine, though I don't think it's useful for the guest
> to use it if it already has RDRAND and/or RDSEED.
> 
Agree. It is unfortunate that we add PV interfaces for a HW that will be extinct
in a couple of years though :(

--
			Gleb.
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