Re: [PATCH] x86: limit mwait_idle to Intel CPUs

[Markus Rechberger]

H. Peter Anvin wrote:
> Andreas Herrmann wrote:
> > It is not equivalent. Usually users check /proc/cpuinfo for their
> > CPU features. Deleting that flag is kind of obfuscation.
> >
> > I guess some time ago people did not care about their "svm" or "vmx"
> > flags. Nowadays (e.g. with kvm) some people are quite happy
> > if one of those strings occurs in /proc/cpuinfo (and they are quite
> > disappointed if this feature was disabled by BIOS).
>
> What you're saying is that you want it to appear in /proc/cpuinfo for 
> marketing reasons even though it's not usable.
>
> The ones in /proc/cpuinfo are cooked values anyway; there is plenty of 
> history to that effect.
>
> I would agree with Andi that if as far as Linux is concerned mwait is 
> unusable on AMD Fam10 processors, then the CPU detection code should 
> turn this bit off on AMD Fam10 processors.
please see:

http://kvm.qumranet.com/kvmwiki/FAQ

"How can I tell if I have Intel VT or AMD-V?"

Markus

--
Markus Rechberger
Operating System Research Center
AMD Saxony LLC & Co. KG



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