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Re: [Xen-devel] dom0 boot failure with 256G

from [Keir Fraser] [Permanent Link][Original]
To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] dom0 boot failure with 256G
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Thu, 05 Jun 2008 13:58:15 +0100
Cc: "Kurt C. Hackel" <kurt.hackel@xxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, mukesh.rathor@xxxxxxxxxx
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On 5/6/08 13:54, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:

> Keir Fraser wrote:
>> Actually compat guests are good for up to 128GB, so you should be fine with
>> no dom0_mem= parameter.
>>   
> 
> Real PAE processors are limited to 2^36 = 64GB, and the guest kernel may
> mask ptes at that point.

A paravirtualised kernel needs to have its PAGE_MASK widened. This is a bug
we've bumped into once or twice.

 -- Keir



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