Official Xen Guide and the offical wiki page:
- https://wiki.gentoo.org/wiki/Xen
- https://wiki.xen.org/wiki/Main_Page


If you use OpenRC:
It is recommended to utilise the xencommons script to configure the system at
boot time.


If you use QEMU:
The qemu-bridge-helper is renamed to the xen-bridge-helper in the in
source build of qemu.  This allows for app-emulation/qemu to be emerged
concurrently with the qemu capable xen.  It is up to the user to
distinguish between and utilise the qemu-bridge-helper and the
xen-bridge-helper. File bugs of any issues that arise.