Re: [Xen-devel] [patch] make cpufreq with speedstep-centrino work underXen

[Christian Krafft <parabelboi@xxxxxxxxxxxxxxx>]

Ian Pratt wrote:

> > The attached patch fixes the speedstep-centrino driver, to 
> > use the hypervisors MSR's instead of direct MSR access.
> > Without the patch the frequency seems to have changed, but 
> > the powerconsumption of the CPU has not.
> > Thanks to the patch of Matt T. Yourst found here 
> > http://lists.xensource.com/archives/html/xen-devel/2006-03/msg
> > 01410.html
> > It was easy to fix the centrino driver, too.
> >
> > If someone could review the patch and bring it upsream (if 
> > it's ok), it would be very nice.
> >    
> Why not just update xen's MSR emulation code to handle this case? The
> msr hypercall is pretty much a legacy thing.
>
> Ian 
>
>  
Hi Ian,

that sounds even better, no need to change all the other cpufreq drivers ;-)
Unfortunately I don't know how to fix the MSR emulation code.
Any idea, how much effort it will be, resp. when the fix might be 
available ?
Thanks,
ck

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