[ Thanks to Boris
Derzhavets for this link. ]
“Michael Young wrote xen-4.0.0-0.2.rc4.fc12.src.rpm for
Xen-4-rc4 for Fedora 12 to install Hypervisor (changeset 20950).
Schema bellow modifying content of mentioned src.rpm allows to
build set of RPMS upgrading Xen Hypersor 4.0 matching current tip
CS of http://xenbits.xensource.com/xen-unstable.hg,no matter of rc4
in fact, via hot upgrade without rebuilding development Xen System
on top of F12 with recent PVOps kernel 2.6.32.9. Directory
gemu-xen.git is only determined by value of QEMU_TAG in Config.mk
file under xen-unstable tree clone.“Make a fresh clone of Xen unstable (4.0)
# hg clone http://xenbits.xensource.com/xen-unstable.hg
# cd xen-unstable.hg
# hg log|more”