#! /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 next to disk.img.
# - Replaced -usb (EHCI) with -device qemu-xhci (XHCI).
# - 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

"${kvm[@]}" \
  -M virt \
  -bios "$dir/QEMU_EFI.fd" \
  \
  -m 4G \
  -cpu host -smp "4,sockets=1,cores=4,threads=1" \
  \
  -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-tablet \
  \
  -chardev stdio,id=qmp \
  -mon chardev=qmp,mode=control,pretty=on \
  \
  -boot c "$@"

#  -chardev socket,id=mon,path=/tmp/test-machine-sock,server,nowait \
#  -mon chardev=mon,mode=readline \

# { "execute": "qmp_capabilities" }

#  -device "virtio-blk-pci,scsi=off,drive=disk0"
#
#  -device "virtio-scsi-pci,id=scsi" \
#  -device "scsi-hd,drive=disk0" \

#  -vnc "localhost:1" \
# -monitor "telnet::5555,server,nowait"

# -vnc "localhost:1" - 5901
# vncviewer localhost:5901

#-vnc "unix:$dir/vnc" \
#-monitor "unix:$dir/monitor,server,nowait"

if [ -z "$etap" ]; then
  sudo ip tuntap delete "$tap" mode tap
fi

exit 0

sudo "${kvm[@]}" \
  -m 8G \
  -cpu host -smp "sockets=1,cores=4,threads=2" \
  -device "$nic,netdev=net0,mac=$mac" \
  -netdev "tap,id=net0,script=./qemu-ifup" \
  -device "virtio-scsi-pci,id=scsi" \
  -device "scsi-hd,drive=disk1" \
  -drive  "if=none,id=disk1,file=$dir/disk.img,format=raw" \
  -boot c

#  -kernel buildos-image -initrd buildos-initrd \
#  -append "buildos.smtp_relay=build2.org buildos.admin_email=admin@build2.org"

#/usr/bin/kvm-spice -name windows10-vc15rc2 -S -machine pc-i440fx-wily,accel=kvm,usb=off -cpu Broadwell,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff -m 4096 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 16237884-61fb-4000-bdca-5c86bb83fe1a -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-windows10-vc15rc2/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2 -drive file=/home/vm/windows10-vc15rc2.img,format=raw,if=none,id=drive-virtio-disk0 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive if=none,id=drive-ide0-0-0,readonly=on -device ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev tap,fd=26,id=hostnet0,vhost=on,vhostfd=28 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:8f:c4:d5,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc 127.0.0.1:0 -device VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -msg timestamp=on

#/usr/bin/kvm-spice -name debian8 -S -machine pc-i440fx-xenial,accel=kvm,usb=off -cpu Broadwell -m 4096 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid eb483372-8ffe-4c60-8ad9-9c89cb74e314 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-debian8/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2 -drive file=/btrfs/boris/machines/linux_debian_8-gcc_4.9-1.0/disk.img,format=raw,if=none,id=drive-virtio-disk0 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=27,id=hostnet0,vhost=on,vhostfd=29 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:52:2e:fb,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -device usb-tablet,id=input0 -vnc 127.0.0.1:1 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 -msg timestamp=on