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

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Message-ID: <20130620093337.GI32694@pd.tnic>
Date:	Thu, 20 Jun 2013 11:33:37 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Linux EFI <linux-efi@...r.kernel.org>,
	Matt Fleming <matt@...sole-pimps.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 Thu, Jun 20, 2013 at 11:22:37AM +0200, Ingo Molnar wrote:
> > > Cool - and supposedly this will work in a Mac environment as well? Would 
> > > be very nice to avoid fundamentally fragile system specific quirks for 
> > > something as fundamental as the EFI runtime memory mapping model ...
> > 
> > Apple is the only case where I'd expect there to be an issue, since they 
> > only started supporting booting Windows via UEFI on very recent systems. 
> > However, unless they're actually sniffing the page tables on UEFI entry, 
> > I can't see any way that this could break things???
> 
> Agreed - I was susprised to see that the runtime was able to _break_ in 
> any way due to 1:1: my assumption was that it can only get better.
> 
> But I did not realize that the 1:1 boot flag also changed what was passed 
> down, which probably explains the breakages.

Right, in the next version, the boot flag will influence only what's
being passed down.

> I'd even argue to not do this whole boot flag thing at all - just 
> standardize on the Windows compatibility model as closely as possible.

This will break the Macs so maybe we can do

efi=no_11_map

so the Macs can still boot but use the 1:1 map by default.

-- 
Regards/Gruss,
    Boris.

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