[Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Andi Kleen wrote:
> Jeremy Fitzhardinge <jeremy@xxxxxxxx> writes:
>   
> > This moves __PAGE_OFFSET up by 16 GDT slots, from 0xffff810000000000
> >     
> GDT?  PDP?
>   
I meant PGD slots.  Or PML4 in x86 terms.

> > to 0xffff880000000000.  I have no general justification for this: th
> >     
> This will significantly decrease the maximum amount of physical
> memory supported by Linux longer term.
>   
A bit, but not "significantly".  We'd already discussed that if the 
amount of physical starts approaching 2^48 then we'd hope that the chips 
will grow some more virtual bits.
   J

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