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 08:39, Jan Beulich wrote:
> > > > 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
Hi Jan,

I'll submit a patch with the map entries in the if block swapped. I'll 
make the patch, then test it for you guys, then post it. Do I just send 
it to this list (for the benefit of others and for upstream 
consideration)?
When you say "use UEFI as intended", is there something wrong with just 
flipping the if block on its head?
Thanks


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