On Thu, Sep 13, 2012 at 10:00:26AM +0200, Paolo Bonzini wrote:
> 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.
>
Everything is list of bits in computers :) At least 0xce is documented in SDM.
It cannot be implemented in a migration safe manner.
--
Gleb.
