From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: dom0_mem  with 2.6.29-rc8
Date: Fri, 20 Mar 2009 12:35:09 -0700
Message-ID: <49C3EFED.7050002@goop.org>
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Boris Derzhavets wrote:
> System loaded with grub entry:-
>
> title Xen 3.4 / Ubuntu 8.10, kernel 2.6.29-tip
> uuid    9efba9a5-9f2b-4bf6-b8b5-7d6d53eb02d9
> kernel  /boot/xen-3.4.gz
> module  /boot/vmlinuz-2.6.29-rc8-tip root=/dev/sdb14 ro console=tty0
> module  /boot/initrd-2.6.29-rc8-tip.img
>
> seems to allocate required amount of memory for DomUs with no problems.
>

Yes.  Originally dom0_mem was needed to make sure that the dom0 memory 
didn't overlap the pci window in the physical address space, but that's 
no longer needed.  Ballooning takes care of shrinking dom0 to make space 
for domUs (though in a dedicated Xen system, starting dom0 with a 
limited amount of memory to leave a well-defined amount of space for domUs.

    J