[Xen-users] regression in 4.3.3 - can't boot anymore from GPT disk

[Atom2 <ariel.atom2@xxxxxxxxxx>]

Hi guys,
After updating to the latest version of xen 4.3.3 on gentoo (from 
4.3.3-r2 to 4.3.3-r3) I am unable to start two of my previously 
flawlessyly working freebsd HVM domUs; a third one is still working fine 
(that's the pfsense domU which is based on freebsd as well).
Upon investigation it turned out that the working freebsd (pfsense) domU 
uses MBR for the disk partition schema wheras the two other domUs use 
GPT partitioned disks.
Both non-working domUs simply hang (but consume CPU cycles) and don't 
start any part of the BSD bootloader. It appears as if the disk is not 
found. The messages in the VNC screen are as follows:
====== VNC screen ======
SeaBIOS (version ?-20141222_100956-vm-host)

Press F12 for boot menu.

Booting from Hard Disk...
====== end VNC screen =======

On the (serial) console which is redirected to a GNU-screen session the 
following information is displayed:
======= serial console ========
Parsing config from /etc/xen/auto/dc1
xc: info: VIRTUAL MEMORY ARRANGEMENT:
  Loader:        0000000000100000->00000000001c1284
  Modules:       0000000000000000->0000000000000000
  TOTAL:         0000000000000000->000000007f800000
  ENTRY ADDRESS: 0000000000100000
xc: info: PHYSICAL MEMORY ALLOCATION:
  4KB PAGES: 0x0000000000000200
  2MB PAGES: 0x00000000000003fb
  1GB PAGES: 0x0000000000000000
Daemon running with PID 4653
======= end serial console ========

The setup for all three domU disks (the working and the two 
non-woprking) is based on LVM and it's always the complete disk (i.e. no 
partitions) that's being passed through to XEN. The only visible 
difference is MBR versus GPT.
All freebsd installations on the LVM disks are o.k. and working because 
I am able to fire-up the non-booting domUs by starting from a live CD 
through XEN (passing through the live CD ISO file and changing the boot 
order to D instead of C) by instructing the (then appearing) bootloader 
to start the installed system from the disk instead of from the CD.
I wonder whether recently there have been any changes to the way (GPT) 
disks are handled in SeaBIOS?
I very much appreciate any help and I am clearly happy to provide 
further information.
Thanks in advance,

Atom2

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