windows_vm.sh

#!/bin/bash

MEMORY=8192
CORES=4
DISK_IMAGE=windows10.qcow2
LIVE_CD=Win10_French_x64.iso # Download this from https://www.microsoft.com/fr-fr/software-download/windows10

create () {
    # Will create a blank disk of 64G maximum capacity
    # It does not require 64G of disk space on your computer, but just creates a file that can contain up to 64G in a VM
    qemu-img create -f qcow2 "$DISK_IMAGE" 64G
}

install () {
    # Launch the actual installation of windows, you need to go through it manually
    qemu-system-x86_64 \
    -m $MEMORY \
    -boot d \
    -net nic \
    -smp $CORES \
    -net user \
    -enable-kvm \
    -hda "./$DISK_IMAGE" \
    -cdrom "./$LIVE_CD"
}

start () {
    # start the created VM
    qemu-system-x86_64 \
    -m $MEMORY \
    -boot d \
    -net nic \
    -smp $CORES \
    -net user \
    -enable-kvm \
    -hda "./$DISK_IMAGE"
}

First run:

source ./windows_vm.sh
create # Create the disk
install # Start the VM with the inserted installation disk

Once this has exited, start the VM using that command each time:

source ./windows_vm.sh
start