[Xen-devel] Core parking feature enable

["Liu, Jinsong" <jinsong.liu@xxxxxxxxx>]

Core parking is a power control feature and it can co-work with NPTM to control 
system power budget through online/offline some CPUs in the system. These 
patches implement core parking feature for xen. They consist of 2 parts: dom0 
patches and xen hypervisor patches.

At dom0 side, patches include
[Patch 1/3] intercept native pad (Processor Aggregator Device) logic, providing 
a native interface for natvie platform and a paravirt template for paravirt 
platform, so that os can implicitly hook to proper ops accordingly;
[Patch 2/3] redirect paravirt template to Xen pv ops;
[Patch 3/3] implement Xen pad logic, and when getting pad device notification, 
it hypercalls to Xen hypervisor for core parking. Due to the characteristic of 
xen continue_hypercall_on_cpu, dom0 seperately send/get core parking 
request/result;

At Xen hypervisor side, patches include
[Patch 1/2] implement hypercall through which dom0 send core parking request, 
and get core parking result;
[Patch 2/2] implement Xen core parking. Different core parking sequence has 
different power/performance result, due to cpu socket/core/thread topology. 
This patch provide power-first and performance-first policies, users can choose 
core parking policy on their own demand, considering power and performance 
tradeoff.

cc Shaohua, core parking feature author at linux kernel side.

Thanks,
Jinsong
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