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Add a new guest_flag GUEST_FLAG_PMU_PASSTHROUGH to indicate whether to passthrough Performance Monitor Unit (PMU) to a VM or not. If GUEST_FLAG_PMU_PASSTHROUGH is set for a VM, passthrough PMU. Currently, PEBS is not supported. Tracked-On: #5132 Signed-off-by: Binbin Wu <binbin.wu@intel.com>