linux-kernel - Re: [Patch V4 13/16] xen: add explicit memblock

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Message-ID: <5575878E.4040109@citrix.com>
Date:	Mon, 8 Jun 2015 13:16:14 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Juergen Gross <jgross@...e.com>, <xen-devel@...ts.xensource.com>,
	<konrad.wilk@...cle.com>, <boris.ostrovsky@...cle.com>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Patch V4 13/16] xen: add explicit memblock_reserve() calls for
 special pages

On 08/06/15 13:06, Juergen Gross wrote:
> Some special pages containing interfaces to xen are being reserved
> implicitly only today. The memblock_reserve() call to reserve them is
> meant to reserve the p2m list supplied by xen. It is just reserving
> not only the p2m list itself, but some more pages up to the start of
> the xen built page tables.
> 
> To be able to move the p2m list to another pfn range, which is needed
> for support of huge RAM, this memblock_reserve() must be split up to
> cover all affected reserved pages explicitly.
> 
> The affected pages are:
> - start_info page
> - xenstore ring
> - console ring
> - shared_info page

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

David
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