tools: labs: qemu: Add option for nested virtualization

Author: krady21

tools/labs/qemu/Makefile

@@ -27,8 +27,13 @@ QEMU_OPTS = -kernel $(ZIMAGE) \
 	--append "root=/dev/vda loglevel=15 console=hvc0" \
 	--display $(QEMU_DISPLAY) -s -m 256
 
+ifdef ENABLE_KVM
+QEMU_OPTS += -enable-kvm -cpu host
+ENABLE_KVM_SUDO = sudo
+endif
+
 boot: .modinst tap0 tap1 pipe1.in pipe1.out pipe2.in pipe2.out disk1.img disk2.img nttcp-run
-	ARCH=$(ARCH) qemu/qemu.sh $(QEMU_OPTS)
+	$(ENABLE_KVM_SUDO) ARCH=$(ARCH) qemu/qemu.sh $(QEMU_OPTS)
 
 TEMPDIR := $(shell mktemp -u)