linux-kernel - Re: [Xen-devel] [PATCH V2 1/5] Xen: Delay remapping memory of pv-domain

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Message-ID: <545CDDF6.9080902@citrix.com>
Date:	Fri, 7 Nov 2014 14:57:58 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Juergen Gross <jgross@...e.com>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xensource.com>, <konrad.wilk@...cle.com>,
	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>,
	<x86@...nel.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<hpa@...or.com>
Subject: Re: [Xen-devel] [PATCH V2 1/5] Xen: Delay remapping memory of pv-domain

On 06/11/14 05:47, Juergen Gross wrote:
> Early in the boot process the memory layout of a pv-domain is changed
> to match the E820 map (either the host one for Dom0 or the Xen one)
> regarding placement of RAM and PCI holes. This requires removing memory
> pages initially located at positions not suitable for RAM and adding
> them later at higher addresses where no restrictions apply.
> 
> To be able to operate on the hypervisor supported p2m list until a
> virtual mapped linear p2m list can be constructed, remapping must
> be delayed until virtual memory management is initialized, as the
> initial p2m list can't be extended unlimited at physical memory
> initialization time due to it's fixed structure.
> 
> A further advantage is the reduction in complexity and code volume as
> we don't have to be careful regarding memory restrictions during p2m
> updates.

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

But I would like a second reviewed-by.

David
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