linux-kernel - Re: [Xen-devel] [PATCH 0/2] xen: Switch to virtual mapped linear p2m list

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Message-ID: <544F8F3A.3030505@citrix.com>
Date:	Tue, 28 Oct 2014 12:42:34 +0000
From:	Andrew Cooper <andrew.cooper3@...rix.com>
To:	David Vrabel <david.vrabel@...rix.com>,
	Juergen Gross <jgross@...e.com>,
	Ian Campbell <Ian.Campbell@...rix.com>
CC:	<boris.ostrovsky@...cle.com>, <xen-devel@...ts.xensource.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 0/2] xen: Switch to virtual mapped linear
 p2m list

On 28/10/14 12:39, David Vrabel wrote:
> On 28/10/14 12:07, Juergen Gross wrote:
>> Okay, back to the original question: is the (up to) 64 MB virtual
>> mapping of the p2m list on 32-bit pv domains a problem or not?
> I think up-to 64 MiB of vmalloc area is fine.  The vmalloc space can be
> increased with a command line option in the unlikely event that there
> are domUs that would be affected.
>
>> If yes, the virtual mapped linear p2m list could still be used on
>> 64 bit domains, paving the way for support of more than 512 GB of
>> domain memory. OTOH having to keep the p2m tree coding alive isn't
>> my favorite solution...
> Having to keep both the tree and linear p2m code would be awful.  Let's
> not do this!
>
> David

How is the toolstack expected to find and mutate this p2m on migrate? 
The toolstack does not use guest pagetables.

~Andrew
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