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

[Jonathan Tripathy <jonnyt@xxxxxxxxxxx>]

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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