virno-vfio

#!/bin/sh

# Launches one-time modified domain with video switched to VGA and VGA passthrough removed
# Requires libvirt and virtinst
# Assumes you have VGA passthrough with a display server attached, with video device likely set to 'none'

# Your domain name
DOMAIN="mydomain"
# Set to qxl if you wish
NEW_VIDEO="vga"
# your passed through VGA card devices findable by virt-xml
VGA_DEVICES="27:00.0 27:00.1"

virt-xml --edit --video model.type=${2:-$NEW_VIDEO} --connect qemu:///system ${1:-$DOMAIN} --print-xml > /tmp/custom-virsh-create_novfio.xml
for DEVICE in ${3:-$VGA_DEVICES}
    do virt-xml --remove-device --hostdev $DEVICE --print-xml < /tmp/custom-virsh-create_novfio.xml > /tmp/custom-virsh-create_remove-$DEVICE.xml
    cat /tmp/custom-virsh-create_remove-$DEVICE.xml > /tmp/custom-virsh-create_novfio.xml
    rm /tmp/custom-virsh-create_remove-$DEVICE.xml
done

virsh --connect qemu:///system create /tmp/custom-virsh-create_novfio.xml
rm /tmp/custom-virsh-create_novfio.xml