apt-get install bcc bin86 gawk bridge-utils iproute libcurl3 libcurl4-openssl-dev bzip2 module-init-tools transfig tgif texinfo texlive-latex-base texlive-latex-recommended texlive-fonts-extra texlive-fonts-recommended pciutils-dev mercurial make gcc libc6-dev zlib1g-dev python python-dev python-twisted libncurses5-dev patch libvncserver-dev libsdl-dev iasl libbz2-dev e2fslibs-dev git-core uuid-dev ocaml ocaml-findlib libx11-dev bison flex xz-utils libyajl-dev gettext libpixman-1-dev
 
apt-get build-dep xen
 
cd /usr/src
wget http://bits.xensource.com/oss-xen/release/4.4.0/xen-4.4.0.tar.gz
tar xvzf xen-4.4.0.tar.gz
cd xen-4.4.0
./configure --prefix=/usr
make dist
make install

/etc/network/interfaces

iface eth0 inet manual
 
auto xenbr0
iface xenbr0 inet dhcp
  bridge_ports eth0

update-rc.d xencommons defaults
update-rc.d xendomains defaults
update-rc.d xen-watchdog defaults

apt-get install virt-manager
mkdir /var/log/libvirt/libxl/

notes: for some reason libvirt-bin needs /var/log/libvirt/libxl/ created otherwise libvirtd will not start. You also need to add a new xen hypervisor connection to virt-manager the first time you start virt-manager.

cd /boot/
rm xen-4.4.gz xen-4.gz xen.gz

update-grub

Notes: By default ubuntu will not boot xen so you either need to change the default boot entry or force grub boot menu to be displayed

apt-get build-dep libvirt
tar xvzf libvirt-1.2.2.tar.gz -C /usr/src
cd /usr/src/libvirt-1.2.2
./configure --prefix=/usr/
make
make install

# =====================================================================
# Example HVM guest configuration
# =====================================================================
#
# This is a fairly minimal example of what is required for an
# HVM guest. For a more complete guide see xl.cfg(5)

# This configures an HVM rather than PV guest
builder = "hvm"

# Guest name
name = "win7"

device_model_version ="qemu-xen"
device_model_override="/usr/lib/xen/bin/qemu-system-i386"

# 128-bit UUID for the domain as a hexadecimal number.
# Use "uuidgen" to generate one if required.
# The default behavior is to generate a new UUID each time the guest is
started.
#uuid = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"

# Enable Microsoft Hyper-V compatibile paravirtualisation /
# enlightenment interfaces. Turning this on can improve Windows guest
# performance and is therefore recommended
#viridian = 1

# Initial memory allocation (MB)
memory = 1024

# Maximum memory (MB)
# If this is greater than `memory' then the slack will start ballooned
# (this assumes guest kernel support for ballooning)
#maxmem = 512

# Number of VCPUS
vcpus = 2

# Network devices
# A list of 'vifspec' entries as described in
# docs/misc/xl-network-configuration.markdown
vif = [ 'type=ioemu, mac=00:16:3E:*:*:*,bridge=br0']

# Disk Devices
# A list of `diskspec' entries as described in
# docs/misc/xl-disk-configuration.txt
disk = [ '/root/win7.img,raw,hda,rw' ]

# Guest VGA console configuration, either SDL or VNC
sdl = 0
#vnc = 1
#vnclisten="0.0.0.0"
stdvga=0
spice=1
spicehost='10.10.*.*'
spiceport=6000
spicedisable_ticketing=1
stdvga=0
#videoram=128
#device_model_args=["-device","qxl-vga"]

#hap=1
pae=1
acpi=1
apic=1
nx=1
xen_platform_pci=1
usbdevice='tablet'
qxl=1
audio=1
soundhw='es1370'