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

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Date:	Wed, 19 Jun 2013 15:04:34 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
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


* Borislav Petkov <bp@...en8.de> wrote:

> On Wed, Jun 19, 2013 at 02:52:43PM +0200, Ingo Molnar wrote:
> > I hope making it a weird boot option is not the end plan, there's
> > little point in _not_ enabling 1:1 mappings by default eventually:
> > the 1:1 mapping is supposed to emulate a "Windows compatible" EFI
> > environment better and is expected to work around certain EFI runtime
> > crashes.
> 
> And yet there are the Macs which reportedly cannot stomach this.

Do we know why?

> And then there's the issue where some boxes cannot boot through the EFI 
> stub with those patches even without "efi=1:1_map" on the command line. 
> The issue has something to do with the "cmpb $0, efi_use_11_map" in the 
> efi_callX stubs.

A bug I suspect?

> And then again, other boxes have no problem with it and boot perfectly 
> fine.
> 
> So I don't know - it all looks like a weird boot, opt-in option for now.

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

Thanks,

	Ingo
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