* RPM - http://upload.packages.lcfg.ucs.ed.ac.uk/pkgs/devolved/world/sl5_64/rpms/lcfg-libvirt-0.1.2-1.noarch.rpm
* SRPM - http://upload.packages.lcfg.ucs.ed.ac.uk/pkgs/devolved/world/sl5_64/srpms/lcfg-libvirt-0.1.2-1.src.rpm
* Schema - http://upload.packages.lcfg.ucs.ed.ac.uk/pkgs/devolved/world/sl5_64/rpms/lcfg-libvirt-defaults-s1-0.1.2-1.noarch.rpm

Any bug reports to lcfg-xen have been applied to lcfrg-libvirt as well. Any future bug reports to lcfg-xen will be applied to lcfg-libvirt where there's common code/functionality.

For XEN hosts, the following header (libvirt_xen.h) is required:

#ifndef MDP_OPTIONS_LIBVIRT
#ifndef DENY_MDP_OPTIONS_LIBVIRT
#define MDP_OPTIONS_LIBVIRT

#ifdef OS_LINUX

!profile.packages  mADD(lcfg-libvirt-0.1.2-1/noarch)

/* Make sure we've got the Xen packagelist installed */
#include <lcfg/options/xen.h>

/* Need to install more recent version of libvirt for
 * converting standard Xen config files to libvirt's XML */
!profile.packages   mEXTRA(+libvirt-python-0.6.4-3.phys)
!profile.packages   mEXTRA(+libvirt-devel-0.6.4-3.phys)
!profile.packages   mEXTRA(+libvirt-0.6.4-3.phys)

/* Add qemu package that the latest xen component depends on */
!profile.packages mEXTRA(qemu-img-0.9.1-11.el5)

/* Pull in the default resources */
#include <mdp/defaults/libvirt.h>

!libvirt.hosttype   mSET(xen)

/* Add the required packages if running a minimal build */
!profile.pkgcppopts mADD(-DXEN)

/* Instruct the kernel component to manage the xen type of kernel
 symbolic links (for initrd, kernel, etc.) */
!kernel.kerneltype mSET(xen)

/* Add GRUB stanzas (at the beginning) for the xen kernel (and xen
 kernel single user) and set it to be default.  Warning, these
 settings assume a "standard" MDP GRUB config.  See
 'mdp/defaults/grub.h'.  The PIE 'image-build-lcfg' script looks for
 'xen' in the grub.menuitems_defaultboot resource, and if there is
 one it then munges the menu.lst that the grub component created to
 ensure it boots by default the 'disk1' entry, since the XEN kernel
 isn't installed at first boot (it's not in the image). */

#ifdef MDP_DEFAULTS_GRUB

!grub.menuitems_defaultboot        mPREPEND(xen xensingle)

grub.root_defaultboot_xen          (hd0,4)
grub.kernel_defaultboot_xen        /boot/xen.gz
grub.modules_defaultboot_xen       kernel initrd
grub.module_defaultboot_xen_kernel /boot/vmlinuz root=<%grub.kroot_defaultboot_disk1%> <%grub.kernelargs_defaultboot_disk1%>
grub.module_defaultboot_xen_initrd /boot/initrd.img
grub.boot_defaultboot_xen          yes
grub.title_defaultboot_xen         Scientific Linux (XEN)

grub.root_defaultboot_xensingle          (hd0,4)
grub.kernel_defaultboot_xensingle        /boot/xen.gz
grub.modules_defaultboot_xensingle       kernel initrd
grub.module_defaultboot_xensingle_kernel /boot/vmlinuz root=<%grub.kroot_defaultboot_disk1single%> <%grub.kernelargs_defaultboot_disk1single%>
grub.module_defaultboot_xensingle_initrd /boot/initrd.img
grub.boot_defaultboot_xensingle          yes
grub.title_defaultboot_xensingle         Scientific Linux (XEN Single User)

#else
#error Must include mdp/defaults/grub.h before mdp/defaults/xen-host.h.
#endif /* MDP_DEFAULTS_GRUB */

/* FIXME: Temporarily remove the i386 version of libvirt which was
 erroneously (at my and Panos' request) added to
 lcfg_sl5_64_xen.rpms.  Check if still needed after the 20080911???
 release. */
#ifdef ARCH_X86_64
!profile.packages mEXTRA(-i386/libvirt-*-*)
#endif /* ARCH_X86_64 */

#else
#error Only Linux clients can run libvirt.
#endif /* OS_LINUX */

#else
#pragma LCFG denied "mdp/options/libvirt.h"
#endif /* DENY_MDP_OPTIONS_LIBVIRT */
#else
#pragma LCFG seen "mdp/options/libvirt.h"
#endif /* MDP_OPTIONS_LIBVIRT */

/* eof */

For KVM host, the following header (libvirt_kvm.h) is required:

#ifndef MDP_OPTIONS_LIBVIRT
#ifndef DENY_MDP_OPTIONS_LIBVIRT
#define MDP_OPTIONS_LIBVIRT

#ifdef OS_LINUX

!profile.packages  mADD(lcfg-libvirt-0.1.2-1/noarch)

/* Get our default resources set */
#include <mdp/defaults/libvirt.h>

/* Add some packages which are missing from the full build */
/* FIXME:  Why don't we include the xen packagelist to get
 *         most of these? */
!profile.packages  mADD(libvirt)
profile.packages_libvirt \
xen-libs-3.0.3-94.el5_4.1 \
kvm-kmod-2.6.30.1-1.phys \
xen-devel-3.0.3-94.el5_4.1 \
qemu-kvm-0.11.0-1.phys \
libvirt-python-0.6.4-3.phys \
libvirt-devel-0.6.4-3.phys \
libvirt-0.6.4-3.phys \
virt-manager-0.5.3-10.el5 \
python-virtinst-0.300.2-12.sl.1/noarch \
pulseaudio-libs-0.9.10-1.el5.3 \
/** lcfg-network-1.99.34_dev-23/noarch **/

!libvirt.hosttype   mSET(kvm)

#else
#error Only Linux clients can run libvirt.
#endif /* OS_LINUX */

#else
#pragma LCFG denied "mdp/options/libvirt.h"
#endif /* DENY_MDP_OPTIONS_LIBVIRT */
#else
#pragma LCFG seen "mdp/options/libvirt.h"
#endif /* MDP_OPTIONS_LIBVIRT */
/* eof */

Having created the headers, they could be used by including them in the host's profile as bellow (one per host - they can't co-exist):

#include <phys/options/epcc/libvirt_xen.h>
#include <phys/options/epcc/libvirt_kvm.h>

To have libvirt work effectively, it requires active bridge networking. lcfg-network supports this:

!network.interfaces     mADD(eth0 br0)

!network.hwaddr_eth0    mSET(XX:XX:XX:XX:XX:XX)
!network.ipaddr_eth0    DHCP

!network.bridge_eth0    br0
 
!network.ipaddr_br0     DHCP
!network.type_br0       Bridge

Virtual host example:

!libvirt.vms    mADD(pe2900x1 pe2900x2)

!libvirt.name_pe2900x1                  mSET(pe2900x1)
!libvirt.type_pe2900x1                  mSET(hvm)
!libvirt.uuid_pe2900x1                  mSET(56bcea35-a598-4ce8-97f1-02cba34e325)
!libvirt.disks_pe2900x1                 mADD(root)
!libvirt.diskname_pe2900x1_root         mSET(pe2900x1)
!libvirt.disksize_pe2900x1_root         mSET(32)
!libvirt.diskpath_pe2900x1_root         mSET(/guests)
!libvirt.boot_pe2900x1                  mSET(yes)
!libvirt.opts_pe2900x1                  mADD(vnc monitor)
!libvirt.optvalue_pe2900x1_vnc          mSET(1)
!libvirt.optvalue_pe2900x1_monitor      mSET(pty)

!libvirt.nethost_pe2900x1               mADD(vif1)
!libvirt.hostmac_pe2900x1_vif1          mSET(11:11:aa:cc:dd:ff)
!libvirt.bridge_pe2900x1_vif1           mSET(routed)
!libvirt.netmode_pe2900x1_vif1          mSET(network)

!libvirt.name_pe2900x2                  mSET(pe2900x2)
!libvirt.type_pe2900x2                  mSET(hvm)
!libvirt.uuid_pe2900x2                  mSET(56bcea35-a598-4ce8-97f1-02aba24f2819)
!libvirt.disks_pe2900x2                 mADD(root)
!libvirt.diskname_pe2900x2_root         mSET(pe2900x2)
!libvirt.disksize_pe2900x2_root         mSET(32)
!libvirt.diskpath_pe2900x2_root         mSET(/guests)
!libvirt.opts_pe2900x2                  mADD(vnc monitor)
!libvirt.optvalue_pe2900x2_vnc          mSET(1)
!libvirt.optvalue_pe2900x2_monitor      mSET(pty)

!libvirt.nethost_pe2900x2               mSET(vif1 vif2)
!libvirt.hostmac_pe2900x2_vif1          mSET(21:22:33:44:55:1c)
!libvirt.bridge_pe2900x2_vif1           mSET(routed)
!libvirt.netmode_pe2900x2_vif1          mSET(network)
!libvirt.hostmac_pe2900x2_vif2          mSET(22:2d:ab:21:2c:4a)
!libvirt.bridge_pe2900x2_vif2           mSET(default)
!libvirt.netmode_pe2900x2_vif2          mSET(network)
!libvirt.template_pe2900x2              mSET(/guests/pe2900x1.img)
!libvirt.partition_pe2900x2             mSET(1)

Additional interface example:

!libvirt.networking             mADD(routed)
!libvirt.nettype_routed         mSET(interface)
!libvirt.netname_routed         mSET(routed)
!libvirt.netuuid_routed         mSET(56bcea35-a598-4ce8-97f1-12def24s5125)
!libvirt.bridgename_routed      mSET(virbr19)
!libvirt.mode_routed            mSET(nat)
!libvirt.ipaddr_routed          mSET(192.168.7.1)
!libvirt.netmask_routed         mSET(255.255.255.0)
!libvirt.dhcpstart_routed       mSET(192.168.7.2)
!libvirt.dhcpend_routed         mSET(192.168.7.254)
!libvirt.activate_routed        mSET(yes)

Virtual group example:

!libvirt.virtualgroup               mADD(cluster1) 
!libvirt.groupmemory_cluster1       mSET(1024) 
!libvirt.groupvcpus_cluster1        mSET(2)
!libvirt.groupnettype_cluster1      mSET(network)
!libvirt.groupbridge_cluster1       mSET(routed)

Storage pool example:

!libvirt.storagepools           mADD(testpool)
!libvirt.pooltype_testpool      mSET(dir)
!libvirt.poolname_testpool      mSET(testpool)
!libvirt.pooluuid_testpool      mSET(0ff699dd-a286-443d-a35a-31f00c9d82e7)
!libvirt.targetPath_testpool    mSET(/mnt/test)
!libvirt.allocation_testpool    mSET(200)
!libvirt.capacity_testpool      mSET(150)
!libvirt.available_testpool     mSET(100)
!libvirt.targetOwner_testpool   mSET(980)