[Xen-users] domU kernel does not use complete RAM

[Paul Hink <paul+ml-xen-users.lists.xensource.com@xxxxxxxxx>]

Whenever a domU is configured to get more than approximately 4 GB of
RAM (e.g. by setting "memory = 4500") the domU kernel detects only ~4
GB less than the amount of memory that Xen assigned to it (e.g. with
memory = 4500 the domU only uses 500 MB of RAM, with memory = 6000 it
only uses 2 GB etc.). xentop and `xm list` display the correct
(configured) amount of memory but the domU kernel does not use it.

This problem occurs with the following software versions:

- Debian etch (in both dom0 and domU)
- xen-hypervisor-3.0.3-1-i386-pae (from etch)
- linux-image-2.6.18-6-xen-686 (dom0 kernel from etch)
- linux-xenu-2.6.24 (self-compiled domU kernel based on source code
  from backports.org)

Any ideas what the problem might be or how to track it down?

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