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[Xen-users] Highmem for domU in 2.0.7

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Highmem for domU in 2.0.7
From: Michael Paesold <mpaesold@xxxxxx>
Date: Sat, 10 Sep 2005 14:09:18 +0200
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I would like to use more than 832MB for a single domU. dmesg for the domU says:

BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 000000001b600000 (usable)
Warning only 832MB will be used.
Use a HIGHMEM enabled kernel.
832MB LOWMEM available.

The kernel configuration has:

CONFIG_NOHIGHMEM=y
# CONFIG_HIGHMEM4G is not set

What options should I set here? I would like to give up to about 1.5GB to a domU. Why is highmem disabled by default? Any negative effects on the stability, are there known problems?

Best Regards,
Michael Paesold

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