chore: add QEMU script

This script will help in low-level development.

Signed-off-by: Andrew Rynhard <andrew@andrewrynhard.com>

hack/dev/qemu-boot.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -e
+
+if [[ $# -ne 1 ]]; then
+  echo 1>&2 "Usage: $0 <machine config URL>"
+  exit 3
+fi
+
+case $(uname -s) in
+  LINUX*)
+    ACCEL=kvm
+    ;;
+
+  Darwin*)
+    ACCEL=hvf
+    ;;
+  *)
+    exit 1
+    ;;
+esac
+
+KERNEL="build/vmlinuz"
+INITRD="build/initramfs.xz"
+IMAGE="/tmp/rootfs.qcow2"
+MACHINE_CONFIG="${1}"
+
+qemu-img create -f qcow2 ${IMAGE} 8G
+
+qemu-system-x86_64 \
+    -m 2048 \
+    -accel ${ACCEL},thread=multi \
+    -cpu max \
+    -smp 2 \
+    -hda ${IMAGE} \
+    -netdev user,id=talos,ipv4=on,net=10.254.0.0/24,dhcpstart=10.254.0.10,hostfwd=tcp::50000-:50000,hostname=master-1 \
+    -device virtio-net,netdev=talos \
+    -nographic \
+    -serial mon:stdio \
+    -no-reboot \
+    -append "talos.platform=metal page_poison=1 slab_nomerge pti=on random.trust_cpu=on printk.devkmsg=on earlyprintk=serial,tty0,keep console=tty0 talos.userdata=${MACHINE_CONFIG}" \
+    -kernel ${KERNEL} \
+    -initrd ${INITRD}