added virtio post

1 files changed, 57 insertions, 0 deletions

diff --git a/content/2021-12-02-toying-with-virtio/Makefile b/content/2021-12-02-toying-with-virtio/Makefile
new file mode 100644
index 0000000..4009862
--- /dev/null
+++ b/content/2021-12-02-toying-with-virtio/Makefile
@@ -0,0 +1,57 @@
+VER := 5.15.6
+
+all: kernel init
+
+help:
+	@echo "Build targets:"
+	@echo "* init       - Build busybox based initramfs."
+	@echo "* kernel     - Build minimal linux kernel."
+	@echo "  clean      - Cleanup downloads & builds."
+	@echo ""
+	@echo "Run targets:"
+	@echo "  run        - Boot into the initramfs (qemu)."
+	@echo "  vcon       - Attach to guest virtio console."
+	@echo "               This needs an already running guest VM and must be"
+	@echo "               executed in the same domain as the 'run' target"
+	@echo "               (docker or host)."
+	@echo "               Login as 'root' user, no passwd required."
+	@echo ""
+	@echo "Docker targets:"
+	@echo "  docker     - Build and start the docker container."
+	@echo "  attach     - Start an additional bash in the container."
+	@echo "               This needs an already running container."
+
+kernel:
+	./build_kernel.sh
+
+init:
+	./build_initramfs.sh
+
+run:
+	qemu-system-x86_64                                            \
+	  -nographic                                                  \
+	  -cpu host                                                   \
+	  -enable-kvm                                                 \
+	  -kernel ./linux-$(VER)/arch/x86/boot/bzImage                \
+	  -append "earlyprintk=ttyS0 console=ttyS0 root=/dev/ram0 ro" \
+	  -initrd ./initramfs.cpio.gz                                 \
+	  -device virtio-serial-pci                                   \
+	  -device virtconsole,chardev=vcon,name=console.0             \
+	  -chardev socket,id=vcon,ipv4=on,host=localhost,port=2222,server,telnet=on,wait=off \
+	  -drive format=raw,if=virtio,file=rootfs.ext2 \
+	  -nic user,model=virtio-net-pci
+
+vcon:
+	telnet -4 localhost 2222
+
+clean:
+	$(RM) initramfs.cpio.gz
+	$(RM) -r busybox-*
+	$(RM) -r linux-$(VER)*
+
+docker:
+	DOCKER_BUILDKIT=1 docker build --build-arg UID=$(shell id -u) -t virtio-dev .
+	docker run --name virtio -it --rm -v $(PWD):/develop --device /dev/kvm virtio-dev
+
+attach:
+	docker exec -it virtio bash