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RE: [Xen-devel] [patch] make cpufreq with speedstep-centrino work underX

To: "Christian Krafft" <parabelboi@xxxxxxxxxxxxxxx>, <Xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [patch] make cpufreq with speedstep-centrino work underXen
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Mon, 17 Apr 2006 21:24:56 +0100
Delivery-date: Mon, 17 Apr 2006 13:25:13 -0700
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Thread-topic: [Xen-devel] [patch] make cpufreq with speedstep-centrino work underXen
> 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.


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