From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xen.org>
Subject: Re: Can't see more than 3.5GB of RAM / UEFI / no e820
 memory map detected
Date: Thu, 23 Aug 2012 09:12:15 +0100
Message-ID: <CC5BA46F.49F32%keir@xen.org>
References: <5035DB70.8090800@abpni.co.uk>
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To: Jonathan Tripathy <jonnyt@abpni.co.uk>, Pasi =?ISO-8859-1?B?S+Rya2vkaW5lbg==?= <pasik@iki.fi>
Cc: Jan Beulich <jbeulich@suse.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org

On 23/08/2012 08:27, "Jonathan Tripathy" <jonnyt@abpni.co.uk> wrote:

> Thanks, Pasi.
> 
> A couple of questions:
> 
> I'm guessing xen.efi (from 4.2) just replaces grub??
> 
> Also, if I were to apply that patch from superuser
> (http://serverfault.com/questions/342109/xen-only-sees-512mb-of-system-ram-sho
> uld-be-8gb-uefi-boot),
> would have have any bad consequences? I'm very security conscience as
> the DomUs are untrusted...

Firstly, the same effect *should* be had by adding no-real-mode to your Xen
command line. So try that first.

Secondly, it is arguable that we should patch Xen to prefer "Multiboot-e820"
over "Xen-e801".

And yes, overall if you have a UEFI BIOS then using UEFI Xen is probably
best of all :)

 -- Keir

> Thanks
> 
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