add PTATTR_DIRTY

refs #18

arch/x86/kernel/include/arch-memory.h

@@ -113,6 +113,7 @@ enum ihk_mc_pt_attribute {
 	PTATTR_ACTIVE     = 0x01,
 	PTATTR_WRITABLE   = 0x02,
 	PTATTR_USER       = 0x04,
+	PTATTR_DIRTY      = 0x40,
 	PTATTR_LARGEPAGE  = 0x80,
 	PTATTR_NO_EXECUTE = 0x8000000000000000,
 	PTATTR_UNCACHABLE = 0x10000,

kernel/process.c

@@ -1240,6 +1240,7 @@ static int protection_fault_process_memory_range(struct process_vm *vm, struct v
 	}
 
 	attr = vrflag_to_ptattr(range->flag);
+	attr |= PTATTR_DIRTY;
 	error = ihk_mc_pt_set_pte(vm->page_table, ptep, pgsize, newpa, attr);
 	if (error) {
 		kprintf("protection_fault_process_memory_range"