Re: [Xen-devel] Powernow-k8 support

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 14 Jun 2006, at 22:43, Langsdorf, Mark wrote:

> Should I (as the powernow-k8 maintainer) be modifying this
> code as we add new features?  Most of it looks pretty safe,
> but the new 2.00.00 driver uses different MSRs, and there
> are other things coming up that will confuse things.
One thing I'm a bit undecided on is whether MSR emulation is the right 
way to go, or whether we should just pull the low-level cpufreq drivers 
verbatim into Xen and then provide access to them via hypercalls. We 
could then have a paravirtual cpufreq driver added to Linux. This has 
the advantage that we have less new per-cpu-type code to maintain in 
Xen (we can more easily sync with cpufreq changes in Linux) but it does 
mean we change more Linux code and we'd want to be a bit careful not to 
make the hypercall interface too Linux specific (or too x86 specific).
 -- Keir


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