Generic QEMU on-the-fly VM startup from a disk image

boot-qemu.sh

#!/bin/bash
#########################################################
#
# Generic QEMU on-the-fly VM startup from a disk image.
# 
# Adapted from: https://github.com/kholia/OSX-KVM 
#
#########################################################
set -e

MY_OPTIONS="+aes,+xsave,+avx,+xsaveopt,avx2,+smep"

#Uncomment to enable DVD
#DVD_DRIVE="-drive id=MacDVD,if=none,snapshot=on,media=cdrom,file=./HighSierra.iso -device ide-drive,bus=ide.0,drive=MacDVD "

USE_SPICE="-spice port=5901,addr=127.0.0.1,disable-ticketing,image-compression=off,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x2"

CPU_PENRYN="-cpu Penryn"
CPU_HOST="-cpu host"
CPU="$CPU_HOST,kvm=on,vendor=GenuineIntel,+invtsc,vmware-cpuid-freq=on,$MY_OPTIONS"
declare -a DEFAULT_HDD=( \
	-device ide-drive,bus=ide.1,drive=MacHDD \
	-drive id=GuestHDD,if=none,file=./guest-hdd.img,format=qcow2 \
)

declare -a STORAGE_OPTS=()

getUSBInfo() {
	local deviceName="$1"
	[ -z "$deviceName" ] && { echo "Need to specify a USB device name" >&2; exit -1; }
	usbInfo=$(lsusb | grep "$deviceName")
	[ -z "$usbInfo" ] && { echo "Could not find USB device with name '$deviceName'" >&2; exit -1; }
	sed -E "s/Bus 0*([0-9]+) Device 0*([0-9]+):.+$/hostbus=\1,hostaddr=\2/" <<< $usbInfo
}

usage() {
	cat << EOF

USAGE:
$(basename $0) OPTIONS COMMAND [COMMAND-ARGUMENTS...]

Options:
         -h:           Show this help

         -k:           Always include the default image file with any boot mode

      --usb:           Add a USB device, as specified by name

Commands:
      block:           Boot from the block device specified as an argument
                       E.g.:
                       $(basename $0) block /dev/sdb

    default:           Boot with the default mac HDD image file

       nohd:           Boot without an hard disk

       usb2:
       usb3:           Boot from a USB2 or USB3 drive, using the specified USB
                       device name, as showed by 'lsusb'
                       E.g.:
                       $(basename $0) usb2 Seageate

NOTE: Comment out the "MY_OPTIONS" line in case you are having booting problems!

EOF
}


while [[ "$1" =~ ^- ]]; do
	option="$1"
	case "$option" in
		-h)
			usage
			exit 0
			;;

		--usb)
			shift
			deviceName=$1
			EXTRA_ARGS+=(-device usb-host,$(getUSBInfo $deviceName))
			;;

		-k)
			STORAGE_OPTS+=(${DEFAULT_HDD[@]})
			;;

		*)
			echo "Invalid option"
			usage
			exit 1
			;;
	esac
	shift
done

cmd="$1"
case "$cmd" in
	default)
		STORAGE_OPTS=(${DEFAULT_HDD[@]})
		;;
	usb2)
		STORAGE_OPTS+=(-device usb-host,$(getUSBInfo $2))
		;;
	usb3)
		STORAGE_OPTS+=( \
			-device qemu-xhci,id=xhci \
			-device usb-host,bus=xhci.0,$(getUSBInfo $2) \
		)
		;;
	nohd)
		STORAGE_OPTS=()
		;;
	block)
		blockDevice="$2"
		[[ "$blockDevice" =~ /dev/sd ]] || { echo "Invalid block device specified"; exit -1; }

		STORAGE_OPTS+=( \
			-device ide-drive,bus=ide.1,drive=rawBlock \
			-drive id=rawBlock,file=${blockDevice},format=raw,if=none \
		)
		;;
	*)
		if [ -n "$command" ]; then
			echo "Invalid command"
		else
			echo "A command is required"
		fi
		usage
		exit 1
esac

AUDIO_PA="-audiodev pa,id=pa1,server=/run/user/1000/pulse/native"
AUDIO_ALSA="-audiodev alsa,id=alsa1"
AUDIO=" -soundhw hda $AUDIO_PA"
AUDIO=""

( sleep .2; spicy -h localhost -p 5901 2>/dev/null; ) &

qemu-system-x86_64 -enable-kvm -m 8192 $CPU \
	  -machine pc-q35-2.9 \
	  -smp 8,cores=4 \
	  -usb -device usb-kbd -device usb-tablet \
	  -smbios type=2 \
	  $DVD_DRIVE \
	  $USE_SPICE \
	  $AUDIO \
	  ${STORAGE_OPTS[@]} \
	  -netdev user,id=net0 -device e1000-82545em,netdev=net0,id=net0,mac=52:54:00:c9:18:27 \
	  ${EXTRA_ARGS[@]} \
	  -monitor stdio