Re: [PATCH 4/4] x86, efi: Map runtime services 1:1

From: Borislav Petkov
Date: Thu Jun 06 2013 - 09:29:28 EST

On Thu, Jun 06, 2013 at 02:14:39PM +0100, Matt Fleming wrote:
> This patch makes my TunnelMountain machine spin in handle_pte_fault()
> when triggering one of the "firmware makes references to physical
> addresses" code paths.
> I'll try and dig into this tomorrow to figure out what's going on.

Hmmm, looks like we have forgotten to map an EFI region and we do a #PF
when executing the EFI code.

If so, I'm thinking we don't want to touch the #PF code and teach it
about EFI so maybe we should make sure we've mapped *everything* EFI
runtime would need before we switch PGDs...


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