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

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> Jonathan Tripathy <jonnyt@xxxxxxxxxxx> 08/23/12 9:29 AM >>>
>I'm guessing xen.efi (from 4.2) just replaces grub??

"Replaces" is the wrong term. It simply makes the use of grub.efi (or however
it's named) unnecessary.

>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...

If you wanted to do that, I'd strongly recommend only removing the E801 code
(obviously, from your log, you don't get E820 entries reported anyway, so this
would be to not harm using hypervisors built from the same source on other
systems) or simply swapping the E801 and multiboot handling order (which may
actually be something to consider even upstream, so you'd be welcome to post
such a patch).

But in the end, in order to indeed use UEFI as intended, you'll need to switch 
to
using xen.efi and an EFI-enabled Dom0 kernel (which upstream pv-ops for now
isn't).

Jan


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