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Re: [Xen-devel] Can't see more than 3.5GB of RAM / UEFI / no e820 memory map detected


  • To: <xen-devel@xxxxxxxxxxxxx>
  • From: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
  • Date: Thu, 23 Aug 2012 09:28:31 +0100
  • Delivery-date: Thu, 23 Aug 2012 08:29:28 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>



On 23.08.2012 09:12, Keir Fraser wrote:
On 23/08/2012 08:27, "Jonathan Tripathy" <jonnyt@xxxxxxxxxxx> 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 :)


Unfortunately, no-real-mode didn't work :(

In xm info, I see

xen_commandline : placeholder no-real-mode

Not sure where placeholder is coming from...

Also, I'm conscience that no-real-mode may cause other problems as it's designed for debugging?

Thanks


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