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VER := 5.15.6
all: kernel init
help:
@echo "Build targets:"
@echo "* init - Build busybox based initramfs."
@echo "* kernel - Build minimal linux kernel."
@echo " ext2 - Build minimal ext2 fs as virtio blkdev backend (uses sudo)."
@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
ext2:
./build_ext2.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=blk.ext2 \
-nic user,model=virtio-net-pci
vcon:
telnet -4 localhost 2222
clean:
$(RM) initramfs.cpio.gz
$(RM) -r busybox-*
$(RM) -r linux-$(VER)*
$(RM) blk.ext2
docker:
DOCKER_BUILDKIT=1 docker build --build-arg UID=$(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
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