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

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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>
This commit is contained in:
Liu, Jinsong
2012-06-11 20:38:08 +08:00
committed by Konrad Rzeszutek Wilk
parent 05e36006ad
commit f65c9bb3fb
5 changed files with 401 additions and 0 deletions
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8
include/xen/interface/platform.h
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@@ -314,6 +314,13 @@ struct xenpf_pcpuinfo {
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_pcpuinfo);
#define XENPF_cpu_online 56
#define XENPF_cpu_offline 57
struct xenpf_cpu_ol {
uint32_t cpuid;
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_cpu_ol);
struct xen_platform_op {
uint32_t cmd;
uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -330,6 +337,7 @@ struct xen_platform_op {
struct xenpf_getidletime getidletime;
struct xenpf_set_processor_pminfo set_pminfo;
struct xenpf_pcpuinfo pcpu_info;
struct xenpf_cpu_ol cpu_ol;
uint8_t pad[128];
} u;
};