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

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Message-ID: <20130604081544.GA23640@pd.tnic>
Date:	Tue, 4 Jun 2013 10:15:44 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Linux EFI <linux-efi@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>, X86-ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>,
	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH 0/4] EFI 1:1 mapping

On Mon, Jun 03, 2013 at 03:54:12PM +0100, Matt Fleming wrote:
> On Mon, 03 Jun, at 03:32:52PM, Matthew Garrett wrote:
> > We can only pass one set of addresses to SetVirtualAddressMap(), but it 
> > doesn't seem like there's any intrinsic reason we can't the runtime 
> > regions mapped to multiple virtual addresses.
> 
> Indeed. That's the approach I took with my 1:1 series from last year. If
> Windows is mapping things at higher addresses like you said, then
> they're probably doing the same.

Right, the way I've done it now is to do the virtual mapping
unconditionally, then do the 1:1 mapping and call SetVirtualAddressMap
(f*cking camelcase is so nasty to type - that's why they need whole IDEs
to program :-)) with that map, if "efi=1:1_map" has been passed on the
cmd line.

After the call, we use *only* the 1:1 map but the virtual mapping is
still there.

The initial approach to addressing the b0rked Macs would then be to
never use the 1:1 map on them.

-- 
Regards/Gruss,
    Boris.

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