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

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Message-ID: <53C6A4A3.1040702@zytor.com>
Date:	Wed, 16 Jul 2014 09:13:23 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Paolo Bonzini <pbonzini@...hat.com>,
	Andy Lutomirski <luto@...capital.net>
CC:	Daniel Borkmann <dborkman@...hat.com>,
	Gleb Natapov <gleb@...nel.org>, kvm list <kvm@...r.kernel.org>,
	"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 07/16/2014 09:08 AM, Paolo Bonzini wrote:
> Il 16/07/2014 18:03, H. Peter Anvin ha scritto:
>> I suggested emulating RDRAND *but not set the CPUID bit*.  We already
>> developed a protocol in KVM/Qemu to enumerate emulated features (created
>> for MOVBE as I recall), specifically to service the semantic "feature X
>> will work but will be substantially slower than normal."
> 
> But those will set the CPUID bit.  There is currently no way for KVM
> guests to know if a CPUID bit is real or emulated.
> 

OK, so there wasn't any protocol implemented in the end.  I sit corrected.

	-hpa


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