Re: [Xen-devel] cpufreq implementation for OMAP under xen hypervisor.

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

It is not stupid, it is actually possible to do it that way.

It would be similar to do cpufreq in dom0: anything you can run in Dom0,
you can also run separately in a little stubdom.

However I think that it would be best to do it in Xen.

On Tue, 19 Aug 2014, Vitaly V. Ch wrote:
> Hi Stefano,
> 
> What do you think about implementation cpufreq driver as stub driver domain?
> 
> Just now I'm not familar enought with latest XEN fetures so my question can 
> be a little stupid :)
> 
> With best regards,
> 
> Vitaly
> 
> 
> On Tue, Aug 12, 2014 at 3:15 PM, Stefano Stabellini 
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
>       On Tue, 12 Aug 2014, Oleksandr Dmytryshyn wrote:
>       > Hi to all.
>       >
>       > I want to implement an cpufreq support for OMAP processors in xen. I
>       > use the Linux kernel as Dom0.
>       >
>       > I know that there are 2 implementations of cpufreq: Domain0 based
>       > cpufreq and Hypervisor based cpufreq. But those implementations are
>       > made only for x86 architecture, not for the ARM architecture.
>       >
>       > Could anybody give me an advise how to do that?
> 
> I think that the best way would be to introduce cpufreq support directly
> in the Xen hypervisor. I would:
> 
> 1) get cpufreq (xen/drivers/cpufreq) to build and run on ARM, with a dummy 
> driver
> although the cpufreq infrastructure has been written with x86 in mind,
> it should be generalizable
> 
> 2) write a cpufreq driver for OMAP
> 
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> 
> 
> 
>

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