+ //\r
+ // During memory attributes updating, new pages may be allocated to setup\r
+ // smaller granularity of page table. Page allocation action might then cause\r
+ // another calling of CpuSetMemoryAttributes() recursively, due to memory\r
+ // protection policy configured (such as PcdDxeNxMemoryProtectionPolicy).\r
+ // Since this driver will always protect memory used as page table by itself,\r
+ // there's no need to apply protection policy requested from memory service.\r
+ // So it's safe to just return EFI_SUCCESS if this time of calling is caused\r
+ // by page table memory allocation.\r
+ //\r
+ if (mIsAllocatingPageTable) {\r
+ DEBUG((DEBUG_VERBOSE, " Allocating page table memory\n"));\r
+ return EFI_SUCCESS;\r
+ }\r