linux-kernel - Re: [PATCH -v2] EFI: Runtime services virtual mapping

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Message-ID: <20130922163801.GD28718@pd.tnic>
Date:	Sun, 22 Sep 2013 18:38:01 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Dave Young <dyoung@...hat.com>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Vivek Goyal <vgoyal@...hat.com>, linux-efi@...r.kernel.org
Subject: Re: [PATCH -v2] EFI: Runtime services virtual mapping

On Sun, Sep 22, 2013 at 08:27:34AM -0700, H. Peter Anvin wrote:a
> The address that faults is interesting in that it is indeed just below
> -4G. The question at hand is probably what information you are using
> to build the EFI mappings in the secondary kernel and what could make
> it not match the primary.

Yep, so obviously we're not building the pagetable in the second kernel
the same way as the first or we're missing some pieces.

Btw, for debugging situations like this one, one could use
arch/x86/mm/dump_pagetables.c successfully by sticking in the right CR3
value into *start.

:-)

-- 
Regards/Gruss,
    Boris.

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