From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: Xen max supported memory per guest VM?
Date: Mon, 16 Aug 2010 10:18:53 +0100
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To: Jan Beulich <JBeulich@novell.com>, "pasik@iki.fi" <pasik@iki.fi>
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On 16/08/2010 10:04, "Jan Beulich" <JBeulich@novell.com> wrote:

>>> But what's the max supported amount of memory for a (64bit) guest?
>> 
>> Allocating the whole 1TB should work. It's unlikely to have been tested
>> though.
> 
> Not everything will work with more than 512G: Anything that wants
> to access the guest's pfn_to_mfn_frame_list_list won't work, as
> there's no specification of how more than a page worth of these top
> level pointers should be expressed. Affected would be (afaict) save/
> restore/migrate, kexec, and dumping of a crashed guest.

Okay, so that's a further restriction on PV guests. HVM guests should
theoretically still be good up to 1TB.

 -- Keir