Message-ID: <544F9440.6070404@suse.com>
Date: Tue, 28 Oct 2014 14:04:00 +0100
From: Juergen Gross <jgross@suse.com>
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To: David Vrabel <david.vrabel@citrix.com>,
        Andrew Cooper <andrew.cooper3@citrix.com>,
        Ian Campbell <Ian.Campbell@citrix.com>
CC: boris.ostrovsky@oracle.com, xen-devel@lists.xensource.com,
        linux-kernel@vger.kernel.org
Subject: Re: [Xen-devel] [PATCH 0/2] xen: Switch to virtual mapped linear
 p2m list
References: <1414421551-31555-1-git-send-email-jgross@suse.com>	<544E61DD.8050305@citrix.com>	<544F22E4.9040706@suse.com> <1414489898.23883.25.camel@citrix.com> <544F83C1.3010402@citrix.com> <544F8713.9040803@suse.com> <544F8E89.6070006@citrix.com>
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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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