From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Tripathy Subject: Re: Can't see more than 3.5GB of RAM / UEFI / no e820 memory map detected Date: Thu, 23 Aug 2012 08:27:44 +0100 Message-ID: <5035DB70.8090800@abpni.co.uk> References: <50356E43.3030208@abpni.co.uk> <50356FB1.2070904@abpni.co.uk> <20120823060620.GE19851@reaktio.net> <20120823072218.GF19851@reaktio.net> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20120823072218.GF19851@reaktio.net> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: =?ISO-8859-1?Q?Pasi_K=E4rkk=E4inen?= Cc: "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org On 23/08/2012 08:22, Pasi K=E4rkk=E4inen wrote: > On Thu, Aug 23, 2012 at 09:06:20AM +0300, Pasi K=E4rkk=E4inen wrote: >> On Thu, Aug 23, 2012 at 12:48:01AM +0100, Jonathan Tripathy wrote: >>> Hi Everyone, >>> >>> CC: Xen-users >>> >>> I am running Ubuntu 12.04 x86_64. My machine has a supermicro >>> motherboard X9SCI-LN4F with 32GB of RAM installed. To get Xen, I simply >>> did apt-get install xen-hypervisor which gives me Ubuntu's 4.1 xen vers= ion. >>> >>> For some reason, Xen can't see any more than about 3.5GB of RAM. I can >>> confirm this by xentop as well as xm info. I am definately running a >>> 64-bit Dom0 kernel as when I boot into it without Xen, I can see all >>> 32GB of RAM by running "free -m". >>> >>> Has anybody come across this issue before? For what it's worth, I'm >>> booting my system using UEFI - could that have something to do with it? >>> >>> Any help is very much appreciated >>> >> Yes, this is UEFI related issue. Can you turn UEFI off? >> >> It looks like you're not running UEFI capable Xen hypervisor. >> (Xen 4.2 has UEFI support, and some vendors have backported UEFI support= on older versions, >> for example Suse SLES11SP2 contains UEFI support in Xen 4.1). >> > Fixed the line above :) > = > -- Pasi > 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-= should-be-8gb-uefi-boot), = would have have any bad consequences? I'm very security conscience as = the DomUs are untrusted... Thanks