linux-kernel - Re: [PATCH 3/4] x86, efi: Add an efi= kernel command line parameter

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Date:	Thu, 6 Jun 2013 20:35:48 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Matt Fleming <matt@...sole-pimps.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>
Subject: Re: [PATCH 3/4] x86, efi: Add an efi= kernel command line parameter

On Thu, Jun 06, 2013 at 08:51:40PM +0200, Borislav Petkov wrote:
> On Thu, Jun 06, 2013 at 06:50:52PM +0100, Matthew Garrett wrote:
> > On Thu, Jun 06, 2013 at 03:26:03PM +0200, Borislav Petkov wrote:
> > 
> > > This would break the Macs, remember?
> > 
> > I think the Macs will be fine as long as we're passing the high mappings 
> > into SetVirtualAddressMap().
> 
> Right, on those we'll fall back to the current mappings and simply not
> have the 1:1 thing.

No, I think that's the wrong thing to do. We should set up the current 
mappings and the 1:1 mappings, and pass the current mappings through 
SetVirtualAddressMap(). That matches the behaviour of Windows.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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