Re: [Xen-devel] [RFC PATCH 11/13] cpufreq: add xen-cpufreq driver

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.10.14 at 13:59, <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx> wrote:
> There are few reasons to not implement PV I2C in Xen:
> 1. It is difficult to implement concurrent access to I2C controller

I already outlined how I think this could be made work.

> 2. I2C code is closely integrated to the Linux kernel code and
> I2C driver has lots of levels of abstraction. It is very difficult to cut
> I2C code from kernel and make kernel working without it. Kernel folks
> will not take this solution to the mainline.
> 3. Implementation of the  I2C driver in Xen will rather be more complex
> than simple.

Others seem to be of different opinion.

> 4. There will be overhead to do all steps above.

Not sure what you mean here.

In any event I don't think we should discard an architecturally clean
option before having tried it. The Dom0-based CPUfreq handling in
x86 also had turned out a mostly dead end (and I'd be glad to see
it gone altogether from the sources).

Jan


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