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DOM0 could deliever whatever performance statistic (Px, _CPC) it parses, it is Xen's responsibility to decide which one it shall accept. Xen rely on XEN_PROCESSOR_PM_xxx flag to tell which mode ( Px or CPPC ) current cpufreq driver supports, and accepts relative info. It will neglect unsupported-mode request and yields success. Signed-off-by: Penny Zheng <Penny.Zheng@amd.com> Acked-by: Jan Beulich <jbeulich@suse.com>