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

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Message-ID: <544F9440.6070404@suse.com>
Date:	Tue, 28 Oct 2014 14:04:00 +0100
From:	Juergen Gross <jgross@...e.com>
To:	David Vrabel <david.vrabel@...rix.com>,
	Andrew Cooper <andrew.cooper3@...rix.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 10/28/2014 01:39 PM, 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.

Okay.

>
>> 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!

Agreed. :-)


Juergen

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