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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4424 In Relaxed-AP Sync Mode, BSP will not wait for all Aps arrive. However, PerformRemainingTasks() needs to wait all Aps arrive before calling SetMemMapAttributes and ConfigSmmCodeAccessCheck() when mSmmReadyToLock is true. In SetMemMapAttributes(), SmmSetMemoryAttributesEx() will call FlushTlbForAll() that need to start up the aps. So it need to let all aps arrive. Same as SetMemMapAttributes(), ConfigSmmCodeAccessCheck() also will start up the aps. Cc: Eric Dong <eric.dong@intel.com> Cc: Ray Ni <ray.ni@intel.com> Signed-off-by: Zhihao Li <zhihao.li@intel.com> Reviewed-by: Ray Ni <ray.ni@intel.com>