Re: [Xen-devel] [RFT] x86/pvh: disable all MTRR CPU features on cpuid for dom0

["Luis R. Rodriguez" <mcgrof@xxxxxxxx>]

On Fri, Mar 27, 2015 at 09:32:10AM +0100, Roger Pau Monné wrote:
> El 27/03/15 a les 0.33, Luis R. Rodriguez ha escrit:
> > From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>
> > 
> > Commit 586ab6a by Roger disabled the main MTRR CPU feature
> > on the cpuid when on pvh in order to avoid having MTRR code
> > run on the OS on dom0. This missed the fact that not all CPUs
> > use this cpuid to identify MTRR support, this complets that.
> > 
> > This could in theory fix some potential issues where MTRR
> > code was previously enabled, for instance running cat /proc/mtrr
> > on a Linux system where MTRR was actually disabled.
> 
> AFAICT we will never support PVH on those CPU types, so I'm not sure if
> it's worth disabling it. AMD K6, Centaur and VIA chips don't have the
> necessary hardware extensions to allow running PVH guests.

Great, should this be annotated?

  Luis

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