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

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Message-ID: <20130619132520.GB28300@pd.tnic>
Date:	Wed, 19 Jun 2013 15:25:20 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linux EFI <linux-efi@...r.kernel.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <mjg59@...f.ucam.org>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH -v2 0/4] EFI 1:1 mapping

On Wed, Jun 19, 2013 at 03:04:34PM +0200, Ingo Molnar wrote:
> Do we know why?

Well, according to mjg59 some Macs break if we don't give them a map
which uses high addresses.

I can imagine flipping the meaning of this option to be on by default
and "efi=no_11_map" to disable the 1:1 map for those Macs.

> A bug I suspect?

Probably. The problem is, it is very hard to debug the boot stub that
early. And of course, I can't reproduce it in qemu :(. If only I had a
hardware debugger...

> But once it works reliably we can enable it, right?

It's all the same to me - I hate EFI with passion so whatever people
agree upon, I'll do it.

-- 
Regards/Gruss,
    Boris.

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