Re: [Xen-devel] [PATCH] Allow dom0 to write MSR IA32_ENERGY_PERF_BIAS

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 05/01/2011 07:59, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>>> Why would you allow this only if Dom0 has its vcpus pinned?
>> 
>> It is meaningless if dom0 can't control all pcpus exactly. Only in case of
>> dom0 vcpus pinned, it makes sense.
> 
> Disagree. The user mode tool could set its own affinity (virtual and
> physical) and then issue the MSR write. Please don't enforce
> restrictions where not really needed (I actually suppose that the
> restriction should be removed for MSR_IA32_THERM_CONTROL too).

If so, it deserves a separate patch to strip out *all* the is_pinned checks
at the same time.

 -- Keir



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