Re: Fix for xen guest with mem > 3.7G

From: Ingo Molnar
Date: Sun Sep 14 2008 - 09:21:28 EST



* Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

> Roberto De Ioris wrote:
> > Xen domU kernel 2.6.26 and 2.6.27-rc cannot allocate
> > more than 3.7GB of ram on my PAE systems (compiled
> > with gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)).
> >
> > I have found the problem is in function xen_memory_setup (in
> > arch/x86/xen/setup.c).
> >
> > It set max_pfn as 'unsigned long' but add_memory_region()
> > takes 'unsigned long long'.
> >
> > I do not know if it is a compiler problem but this is the simple fix
> > (works on my systems):
> >
>
> Thanks very much for the patch. We have a more general fix for this in
> Ingo's tip.git tree, but I overlooked that this particular problem
> affected current -rc.
>
> Ingo, this is fixed by the phys_addr_t + PFN_PHYS() patches. Should
> we send them up to Linus, or do an ad-hoc fix in this one place?

send an ad-hoc fix please .. the phys_addr_t patches have a too wide
impact i think.

Ingo
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