From: Liu, Jinsong <jinsong.liu@intel.com>
Date: Mon, 11 Jun 2012 12:38:08 +0000 (+0800)
Subject: xen/pcpu: Xen physical cpus online/offline sys interface
X-Git-Tag: v3.6-rc1~123^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f65c9bb3fb725551d3e405f4d092caf24929cebe;p=pandora-kernel.git

xen/pcpu: Xen physical cpus online/offline sys interface

This patch provide Xen physical cpus online/offline sys interface.
User can use it for their own purpose, like power saving:
by offlining some cpus when light workload it save power greatly.

Its basic workflow is, user online/offline cpu via sys interface,
then hypercall xen to implement, after done xen inject virq back to dom0,
and then dom0 sync cpu status.

Signed-off-by: Jiang, Yunhong <yunhong.jiang@intel.com>
Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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