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

[Andi Kleen]

Jeremy Fitzhardinge <jeremy@xxxxxxxx> writes:
>
> This moves __PAGE_OFFSET up by 16 GDT slots, from 0xffff810000000000

GDT?  PDP?

> 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.

> "x86_64: PSE no longer a hard requirement."
>
> Because booting under Xen doesn't set PSE, it's no longer a hard
> requirement for the kernel.  PSE will be used whereever possible.

Both sound like cases of "let's hack Linux to work around Xen 
problems"

-Andi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/