linux-kernel - Re: [PATCH v4 2/5] random: Add and use arch_get_rng

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Message-ID: <53CED2B2.1040401@zytor.com>
Date:	Tue, 22 Jul 2014 14:08:02 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	"Theodore Ts'o" <tytso@....edu>, kvm list <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Bandan Das <bsd@...hat.com>, Andrew Honig <ahonig@...gle.com>
Subject: Re: [PATCH v4 2/5] random: Add and use arch_get_rng_seed

On 07/22/2014 02:04 PM, Andy Lutomirski wrote:
> 
> Just to check: do you mean the RDRAND is very likely to work (i.e.
> arch_get_random_long will return true) or that RDRAND will actually
> reseed several times during initialization?
> 

I mean that RDRAND will actually reseed several times during
initialization.  The documented architectural limit is actually
extremely conservative.

Either way, it isn't really different from seeding from a VM hosts
/dev/urandom...

	-hpa

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