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

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Date:	Thu, 6 Jun 2013 15:29:08 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Linux EFI <linux-efi@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Jiri Kosina <jkosina@...e.cz>, X86-ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH 4/4] x86, efi: Map runtime services 1:1

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...

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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