Re: [PATCH -v2 0/4] EFI 1:1 mapping

[Ingo Molnar]

* Matthew Garrett <mjg59@xxxxxxxxxxxxx> wrote:

> On Wed, Jun 19, 2013 at 03:04:34PM +0200, Ingo Molnar wrote:
> > * Borislav Petkov <bp@xxxxxxxxx> wrote:
> > > And yet there are the Macs which reportedly cannot stomach this.
> > 
> > Do we know why?
> 
> I got lost in a maze of pointer arithmetic. There seems to be an 
> assumption that nvram writes should be forbidden if in runtime mode but 
> with pointers still below the phys/virt split, which obviously makes no 
> sense but hey.
> 
> But, as always, the only reliable thing to do here is to behave as much 
> like Windows as possible. [...]

Amen ...

> [...] Which means performing the 1:1 mapping but maintaining the high 
> mapping, and passing the high values via SetVirtualAddressMap.

Cool - and supposedly this will work in a Mac environment as well? Would 
be very nice to avoid fundamentally fragile system specific quirks for 
something as fundamental as the EFI runtime memory mapping model ...

Thanks,

	Ingo
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