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Re: [Xen-devel] Xen max supported memory per guest VM?

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Xen max supported memory per guest VM?
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Mon, 16 Aug 2010 12:34:57 +0300
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>
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On Mon, Aug 16, 2010 at 10:18:53AM +0100, Keir Fraser wrote:
> On 16/08/2010 10:04, "Jan Beulich" <JBeulich@xxxxxxxxxx> 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.

Ok, I updated this info to:

-- Pasi

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