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Re: [Xen-devel] Xen Platform QoS design discussion

>>> "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> 05/30/14 9:52 AM >>>
> From: Jan Beulich [mailto:jbeulich@xxxxxxxx]
>> Question is whether this mechanism (which I'd like to be done so it can also
>> later get added support for e.g. port I/O: see Linux'es dcdbas_smi_request()
>> for where this might be useful) should become a sysctl op or - to be
>> easily usable by the kernel too - a platform one.
>For CQM, this MSR access hypercall may be somewhat specific, because it
>requires one MSR write and one MSR read, which cannot be split into two
>separate hypercalls to avoid preemption in the middle.

Sure - you'd need a flag to suppress preemption between two specific (batched)


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