My Xen 4.8 Config File

arch = 'amd64'
arch_libdir = 'lib64'
firmware_override = "/usr/lib/xen-4.8/boot/hvmloader"
builder='hvm'
memory = 4096
maxmem = 4096
cpus = ["0","1","2","3"]
vcpus = 4
cap = 400
pae = 1
viridian = 0
hpet = 0
localtime = 1
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
usb = 1
usbdevice = "host:17ef:4811"
sdl = 0
shadow_memory = 64
name = "Windows7x64"
acpi = 1
apic = 1
disk = [ 'phy:/dev/sda3,hda,w' , 'file:/root/Desktop/win72.iso,hdc:cdrom,r' ]
boot = "c"
vif = [ 'type=ioemu, mac=ec:55:f9:c9:48:6d, ip=192.168.0.125, model=virtio-net' ]
device_model_override = '/usr/bin/qemu-system-x86_64'
device_model_version = "qemu-xen"
serial='pty'
vnc=1