diff --git a/labcodes/lab1/Makefile b/labcodes/lab1/Makefile
index eacc043..d7e7daf 100644
--- a/labcodes/lab1/Makefile
+++ b/labcodes/lab1/Makefile
@@ -208,12 +208,12 @@ TARGETS: $(TARGETS)
 
 .PHONY: qemu qemu-nox debug debug-nox
 qemu-mon: $(UCOREIMG)
-	$(V)$(QEMU) -monitor stdio -hda $< -serial null
+	$(V)$(QEMU)  -no-reboot -monitor stdio -hda $< -serial null
 qemu: $(UCOREIMG)
-	$(V)$(QEMU) -parallel stdio -hda $< -serial null
+	$(V)$(QEMU) -no-reboot -parallel stdio -hda $< -serial null
 
 qemu-nox: $(UCOREIMG)
-	$(V)$(QEMU) -serial mon:stdio -hda $< -nographic
+	$(V)$(QEMU)   -no-reboot -serial mon:stdio -hda $< -nographic
 TERMINAL        :=gnome-terminal
 debug: $(UCOREIMG)
 	$(V)$(QEMU) -S -s -parallel stdio -hda $< -serial null &
diff --git a/labcodes/lab2/Makefile b/labcodes/lab2/Makefile
index c7dc43d..5496909 100644
--- a/labcodes/lab2/Makefile
+++ b/labcodes/lab2/Makefile
@@ -232,12 +232,12 @@ QEMUOPTS = -hda $(UCOREIMG)
 
 .PHONY: qemu qemu-nox gdb debug debug-mon debug-nox
 qemu-mon: targets
-	$(V)$(QEMU) -monitor stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -monitor stdio $(QEMUOPTS) -serial null
 qemu: targets
-	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -parallel stdio $(QEMUOPTS) -serial null
 
 qemu-nox: targets
-	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+	$(V)$(QEMU)  -no-reboot -serial mon:stdio $(QEMUOPTS) -nographic
 
 gdb:
 	$(V)$(GDB) -q -x tools/gdbinit
diff --git a/labcodes/lab3/Makefile b/labcodes/lab3/Makefile
index bdc49e6..0628063 100644
--- a/labcodes/lab3/Makefile
+++ b/labcodes/lab3/Makefile
@@ -226,12 +226,12 @@ QEMUOPTS = -hda $(UCOREIMG) -drive file=$(SWAPIMG),media=disk,cache=writeback
 
 .PHONY: qemu qemu-nox debug debug-nox
 qemu-mon: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -monitor stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -monitor stdio $(QEMUOPTS) -serial null
 qemu: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -parallel stdio $(QEMUOPTS) -serial null
 
 qemu-nox: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+	$(V)$(QEMU)  -no-reboot -serial mon:stdio $(QEMUOPTS) -nographic
 
 TERMINAL := gnome-terminal
 
diff --git a/labcodes/lab4/Makefile b/labcodes/lab4/Makefile
index 74cc61d..a79cf9f 100644
--- a/labcodes/lab4/Makefile
+++ b/labcodes/lab4/Makefile
@@ -230,12 +230,12 @@ QEMUOPTS = -hda $(UCOREIMG) -drive file=$(SWAPIMG),media=disk,cache=writeback
 
 .PHONY: qemu qemu-nox debug debug-nox
 qemu-mon: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -monitor stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -monitor stdio $(QEMUOPTS) -serial null
 qemu: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -parallel stdio $(QEMUOPTS) -serial null
 
 qemu-nox: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+	$(V)$(QEMU)  -no-reboot -serial mon:stdio $(QEMUOPTS) -nographic
 
 TERMINAL := gnome-terminal
 
diff --git a/labcodes/lab5/Makefile b/labcodes/lab5/Makefile
index 0ebae6d..d5ea58f 100644
--- a/labcodes/lab5/Makefile
+++ b/labcodes/lab5/Makefile
@@ -269,12 +269,12 @@ QEMUOPTS = -hda $(UCOREIMG) -drive file=$(SWAPIMG),media=disk,cache=writeback
 
 .PHONY: qemu qemu-nox debug debug-nox
 qemu-mon: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -monitor stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -monitor stdio $(QEMUOPTS) -serial null
 qemu: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -parallel stdio $(QEMUOPTS) -serial null
 
 qemu-nox: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+	$(V)$(QEMU)  -no-reboot -serial mon:stdio $(QEMUOPTS) -nographic
 
 TERMINAL := gnome-terminal
 
diff --git a/labcodes/lab6/Makefile b/labcodes/lab6/Makefile
index e87d265..fe161c0 100644
--- a/labcodes/lab6/Makefile
+++ b/labcodes/lab6/Makefile
@@ -269,12 +269,12 @@ QEMUOPTS = -hda $(UCOREIMG) -drive file=$(SWAPIMG),media=disk,cache=writeback
 
 .PHONY: qemu qemu-nox debug debug-nox
 qemu-mon: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -monitor stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -monitor stdio $(QEMUOPTS) -serial null
 qemu: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -parallel stdio $(QEMUOPTS) -serial null
 
 qemu-nox: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+	$(V)$(QEMU)  -no-reboot -serial mon:stdio $(QEMUOPTS) -nographic
 
 TERMINAL := gnome-terminal
 
diff --git a/labcodes/lab7/Makefile b/labcodes/lab7/Makefile
index b1a879b..613b097 100644
--- a/labcodes/lab7/Makefile
+++ b/labcodes/lab7/Makefile
@@ -269,12 +269,12 @@ QEMUOPTS = -hda $(UCOREIMG) -drive file=$(SWAPIMG),media=disk,cache=writeback
 
 .PHONY: qemu qemu-nox debug debug-nox
 qemu-mon: $(UCOREIMG)  $(SWAPIMG)
-	$(V)$(QEMU) -monitor stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -monitor stdio $(QEMUOPTS) -serial null
 qemu: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -parallel stdio $(QEMUOPTS) -serial null
 
 qemu-nox: $(UCOREIMG) $(SWAPIMG)
-	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+	$(V)$(QEMU)  -no-reboot -serial mon:stdio $(QEMUOPTS) -nographic
 
 TERMINAL := gnome-terminal
 
diff --git a/labcodes/lab8/Makefile b/labcodes/lab8/Makefile
index 1125da0..d87f0a8 100644
--- a/labcodes/lab8/Makefile
+++ b/labcodes/lab8/Makefile
@@ -309,15 +309,15 @@ QEMUOPTS = -hda $(UCOREIMG) -drive file=$(SWAPIMG),media=disk,cache=writeback -d
 
 .PHONY: qemu qemu-nox debug debug-nox monitor
 qemu-mon: $(UCOREIMG) $(SWAPIMG) $(SFSIMG)
-	$(V)$(QEMU) -monitor stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -monitor stdio $(QEMUOPTS) -serial null
 qemu: $(UCOREIMG) $(SWAPIMG) $(SFSIMG)
-	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot -parallel stdio $(QEMUOPTS) -serial null
 
 qemu-nox: $(UCOREIMG) $(SWAPIMG) $(SFSIMG)
-	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+	$(V)$(QEMU)  -no-reboot -serial mon:stdio $(QEMUOPTS) -nographic
 
 monitor: $(UCOREIMG) $(SWAPING) $(SFSIMG)
-	$(V)$(QEMU) -monitor stdio $(QEMUOPTS) -serial null
+	$(V)$(QEMU)  -no-reboot  -monitor stdio $(QEMUOPTS) -serial null
 
 TERMINAL := gnome-terminal