Re: [GIT PULL] x86/cpu changes for v3.9

[Boris Ostrovsky]

On 02/19/2013 01:21 PM, H. Peter Anvin wrote:
> On 02/19/2013 10:19 AM, Boris Ostrovsky wrote:
> > On 02/19/2013 12:57 PM, Konrad Rzeszutek Wilk wrote:
> > > On Tue, Feb 19, 2013 at 06:47:58PM +0100, Borislav Petkov wrote:
> > > > On Tue, Feb 19, 2013 at 09:38:31AM -0800, H. Peter Anvin wrote:
> > > > > My fault... I was tracking the fix and lost track of the thread.
> > > > >
> > > > > The problem is that the fix is necessary but not sufficient, as it
> > > > > introduces an undesirable host-guest dependency.  In order to allow
> > > > > neerw guests to work on older hosts we also should use the
> > > > > {rd,wr}msr_safe() functions to manipulate this MSR, with a comment
> > > > > as to why.
> > > > >
> > > > > Boris, could you prepare such a patch, please?
> > > > I don't think Boris O. is at AMD anymore. Want me to add that to my 
> > > > fix
> > > > for kvm or prep a separate patch?
> > > CC-ing Boris.
> >
> > BorisP's patch is what I should have done. Can you take it?
>
> As I stated:
>
> >>>> The problem is that the fix is necessary but not sufficient, as it
> >>>> introduces an undesirable host-guest dependency. In order to allow
> >>>> neerw guests to work on older hosts we also should use the
> >>>> {rd,wr}msr_safe() functions to manipulate this MSR, with a comment
> >>>> as to why.

Ah, sorry --- I missed that part.

-boris

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