linux-kernel - Re: [PATCH 3/3] xen: eliminate scalability issues from initial mapping setup

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Message-ID: <54096E56.3050809@suse.com>
Date:	Fri, 05 Sep 2014 10:03:34 +0200
From:	Juergen Gross <jgross@...e.com>
To:	David Vrabel <david.vrabel@...rix.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	jbeulich@...e.com
Subject: Re: [PATCH 3/3] xen: eliminate scalability issues from initial mapping
 setup

On 09/04/2014 02:59 PM, David Vrabel wrote:
> On 04/09/14 13:38, Juergen Gross wrote:
>> Direct Xen to place the initial P->M table outside of the initial
>> mapping, as otherwise the 1G (implementation) / 2G (theoretical)
>> restriction on the size of the initial mapping limits the amount
>> of memory a domain can be handed initially.
>
> The three level p2m limits memory to 512 GiB on x86-64 but this patch
> doesn't seem to address this limit and thus seems a bit useless to me.

Yeah, there seem to be some bits missing...

I'll add another patch to support a 4 level p2m scheme in the kernel.
For the Xen tools I'll do it, too.


Juergen
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