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Date: Thu, 13 Sep 2012 10:57:34 +0300
From: Gleb Natapov <gleb@redhat.com>
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Subject: Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Peter Lieven <pl@dlhnet.de>, Avi Kivity <avi@redhat.com>, "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Thu, Sep 13, 2012 at 09:55:06AM +0200, Paolo Bonzini wrote:
> 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.
> 
Why would anyone will want to run memtest in a vm? May be just add those
MSRs to ignore list and that's it.

--
			Gleb.