QEMU-KVM boot a new x86-64 Virtual Machine from kernel and initrd #qemu

qemu_boot_from_kernel_initrd.sh

#!/usr/bin/env sh

# assume you have bzImage, initrd, cmdline, share, bootdisk, maindisk
# the below will boot a QEMU VM with 2 disks attached (as raw), with host port 55555 mapped to 22
# and also pass the share directory into the VM

qemu-system-x86_64 \
  -kernel ./bzImage \
  -initrd ./initrd \
  -smp $(nproc) \
  -m 8G \
  -append "$(cat ./cmdline)" \
  -vga std \
  -accel kvm \
  -drive file=./bootdisk,format=raw \
  -drive file=./maindisk,format=raw \
  -device virtio-net,netdev=vmnic \
  -netdev user,id=vmnic,hostfwd=tcp:127.0.0.1:55555-:22 \
  -virtfs local,path=./share,mount_tag=share,security_model=passthrough

# you will also need to run `mount -t 9p -o trans=virtio share /mnt/share` inside the guest OS to mount the shared directory

# note that the above is a paravirtualized system, it requires support from the guest OS to have virtio drivers