From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: memtest 4.20+ does not work with -cpu host
Date: Thu, 13 Sep 2012 09:55:06 +0200
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Cc: Avi Kivity <avi@redhat.com>, Gleb Natapov <gleb@redhat.com>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>
To: Peter Lieven <pl@dlhnet.de>
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Il 13/09/2012 09:53, Peter Lieven ha scritto:
>>>>
>>> rdmsr returns it cannot read those MSRs. regardless if I use -cpu host
>>> or -cpu qemu64.
>> On the host.
>>
>>
> did you get my output?
> 
> #rdmsr -0 0x194
> 0000000000011100
> #rdmsr -0 0xce
> 00000c0004011103

Yes, that can help implementing it in KVM.  But without a spec to
understand what the bits actually mean, it's just as risky...

Peter, do you have any idea where to get the spec of the memory
controller MSRs in Nehalem and newer processors?  Apparently, memtest is
using them (and in particular 0x194) to find the speed of the FSB, or
something like that.

Paolo