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diff --git a/test-machine-m1 b/test-machine-m1
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+#! /usr/bin/env bash
+
+# Test a virtual machine with KVM on Apple M1. Notes:
+#
+# - Need QEMU 7 or later.
+# - Expect to find QEMU_EFI.fd and QEMU_VARS.fd next to disk.img.
+# - Installing with -cdrom does not work, have to use scsi-cd:
+#
+#   -device virtio-scsi-pci,id=scsi0 \
+#   -drive if=none,id=cd,file=/tmp/debian-....iso \
+#   -device scsi-cd,drive=cd
+#
+# - Replaced -usb (EHCI) with -device qemu-xhci (XHCI).
+# - Added virtio-gpu-pci (otherwise no graphical output).
+# - Added usb-kbd (otherwise no keyboard).
+# - Must run on either P or E cores (https://gitlab.com/qemu-project/qemu/-/issues/1002)
+# - On M1 0-3 are E, 4-7 are P (lscpu, lscpu -e)
+#
+# -n <nic>
+#   Network adapter to use, for example, virtio-net-pci (default), e1000,
+#   or vmxnet3.
+#
+# -t <tap>
+#   Existing tap interface to use instead of creating a new one (as tap9).
+#
+usage="usage: $0 [-n <nic>] <machine-dir> [<qemu-option>...]"
+
+owd="$(pwd)"
+trap "{ cd '$owd'; exit 1; }" ERR
+set -o errtrace # Trap in functions.
+
+function info () { echo "$*" 1>&2; }
+function error () { info "$*"; exit 1; }
+
+br=br0
+mac="de:ad:be:ef:b8:da"
+
+arch="$(uname -m)"
+kvm=(taskset -c 4-7 "qemu-system-$arch" -enable-kvm)
+
+nic=virtio-net-pci
+etap=
+
+while [ "$#" -gt 0 ]; do
+  case "$1" in
+    -n)
+      shift
+      nic="$1"
+      shift
+      ;;
+    -t)
+      shift
+      etap="$1"
+      shift
+      ;;
+    *)
+      break
+      ;;
+  esac
+done
+
+
+dir="${1%/}"
+shift
+
+if [ -z "$dir" ]; then
+  error "missing machine directory"
+fi
+
+if [ -z "$etap" ]; then
+  tap=tap9
+  sudo ip tuntap delete "$tap" mode tap || true
+  sudo ip tuntap add "$tap" mode tap user "$(whoami)"
+  sudo ip link set "$tap" up
+  #sleep 0.5s
+  sudo ip link set "$tap" master "$br"
+else
+  tap="$etap"
+fi
+
+"${kvm[@]}" \
+  -M virt \
+  \
+  -m 4G \
+  -cpu host -smp "4,sockets=1,cores=4,threads=1" \
+  \
+  -drive "if=pflash,format=raw,readonly=on,file=$dir/QEMU_EFI.fd" \
+  -drive "if=pflash,format=raw,file=$dir/QEMU_VARS.fd" \
+  \
+  -netdev "tap,id=net0,ifname=$tap,script=no" \
+  -device "$nic,netdev=net0,mac=$mac" \
+  \
+  -drive  "if=none,id=disk0,file=$dir/disk.img,format=raw" \
+  -device "virtio-blk-pci,scsi=off,drive=disk0" \
+  \
+  -device qemu-xhci \
+  -device usb-kbd \
+  -device usb-tablet \
+  \
+  -device virtio-gpu-pci \
+  -display default,show-cursor=on \
+  \
+  -chardev stdio,id=qmp \
+  -mon chardev=qmp,mode=control,pretty=on \
+  \
+  -boot c "$@"
+
+if [ -z "$etap" ]; then
+  sudo ip tuntap delete "$tap" mode tap
+fi