Xen Linux domU version compared to NetBSD dom0

[Joel Carnat <joel%carnat.net@localhost>]

Hello,

I hope I didn't miss the answer in mail-index@...

I'm currently running xenkernel33-3.3.1nb1 on netbsd-5-stable/amd64.
Which Xen kernel version can be used as a domU compared to the NetBSD  
dom0 version ?

Should the Linux Xen domU be the exact same version as the dom0 ?
Is it possible to use a "greater" Xen version for a domU ?
Should I use 3.3.1 or less as the domU's Xen kernel version ?

TIA,
    Jo

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