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

[H. Peter Anvin]

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.

	-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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