(vm (name 'pvtest')(memory 420)(maxmem 420)(vcpus 2)(uuid '596a5d21-71f4-8fb2-e068-e2386a5c413e')(bootloader '/usr/bin/pypxeboot')(bootloader_args 'mac=AA:00:86:e2:35:72')(on_poweroff 'destroy')(on_reboot 'destroy')(on_crash 'destroy')(device (vbd (dev 'xvda')(uname 'file:/root/some.img')(mode 'w'))))