Xen users - Jun 2009 - OpenSolaris 103 HVM no longer boots after upgrade from Xen 3.2 to Xen 3.4

I''ve performed an upgrade of our Xen machines from a 32 bit 3.2 
hypervisor to a 64 bit 3.4 one. Pretty much all has gone well but we 
have a few Open Solaris HVM machines (we had to do HVM as PV domU was 
causing dom0 to randomly lock up hard).

Anyway, the problem I''m having is that I cannot succesfully boot these 
Solaris HVMs on the newer hypervisor. I get to grub and this boots the 
kernel, but it doesn''t get much further than this before giving an
error
and trying to reboot.

I think the cause of this is because the disk subsystem is being exposed 
differently and my kernel is looking for it elsewhere as the boot 
archive was created under the 3.2 hypervisor, but I''m struggling to
find
any documentation to back this up.

My config file is:

  name = "solaris-dev"
  builder = "hvm"
  memory = "512"
  disk = [ ''phy:/dev/drbd29,hda,w'' ]
  vif = [ ''type=ioemu,bridge=eth0,mac=00:16:3E:06:F3:65'' ]
  kernel = "/usr/lib/xen/boot/hvmloader"
  vnc=1
  boot="c"
  vcpus=1
  serial = "pty"
  on_reboot = ''preserve''
  on_crash = ''preserve''

and if I boot this on my remaining 3.2 hypervisor it comes up fine.
The error message I get when booting under the 3.4 hypervisor is:

  WARNING: pv driver failed to connect: /xpvd/xdf@768
  Cannot mount root on /pci@0,0/pci-ide@1,1/ide@0/cmdk@0,0:a fstype ufs

  panic[cpu0]/thread=fffffffffbc2a120: vfs_mountroot: cannot mount root

If I don''t have ''preserve'' in my config then it just
reboots.

If I boot into recovery mode then it just gives me a "No installed OS 
instances found" message when I would expect it to offer me the 
opportunity to mount the OS at /a.

Has anyone had any similar experience to this or could offer any advice?

Thanks in advance,

Wilb

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