Pkg xen devel - Dec 2012 - Bug#688311: xen-utils-4.2: qemu-dm not available

Qemu upstream now can be added on xen >=4.2, seabios added support for xen:

  seabios (1.7.1-1) unstable; urgency=low

    * updated to new minor upstream release (1.7.1):
     - native scsi boot support (Closes: #652530)
     - usb-attached scsi boot support
     - Xen support (Closes: #678042)
     - better integration with qemu
     - some bugfixes
    * removed fix-==-in-shell.patch (not needed anymore)
    * updated debian/rules (adapted for upstream changes a bit)
    * updated multiboot.S and fw_cfg.h in debian/optionrom from qemu-1.3
    * updated debian/control VCS links to canonical anonscm.debian.org ones
    * break old qemu-system, not conflict with it, and mention qemu-kvm too

  -- Michael Tokarev <mjt at tls.msk.ru>  Sat, 29 Dec 2012 19:48:28 +0400

Now also qemu package in experimental have xen support.
In these days I have done some test with qemu debian experimental 
package and xen-unstable from source and it works (should work also on 
xen 4.2.x), no critical bugs found, only some minor ones of xen upstream.
All tests I have done are with xl using qemu-system-x86_64 as device 
mapper override (I think that on xen debian package it needs to be used 
by default and it should be done with a debian patch) and seabios 1.7.2 
from experimental (the debian patch to use seabios from package is 
already on svn, I tested it and is working).