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Date: Thu, 13 Sep 2012 10:00:26 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host
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To: Gleb Natapov <gleb@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>

Il 13/09/2012 09:57, Gleb Natapov ha scritto:
>>> > > 
>>> > > #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.

>>From the output it looks like it's basically a list of bits.  Returning
something sensible is better, same as for the speed scaling MSRs.

Paolo