linux-kernel - Re: [regression, bisected] x86: efi: Pass boot services variable info to runtime code

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Date:	Fri, 24 May 2013 08:45:44 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Russ Anderson <rja@....com>
Cc:	Matthew Garrett <matthew.garrett@...ula.com>,
	matt.fleming@...el.com, linux-efi@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Josh Boyer <jwboyer@...hat.com>
Subject: Re: [regression, bisected] x86: efi: Pass boot services variable
 info to runtime code

On Thu, 23 May, at 05:23:21PM, Russ Anderson wrote:
> Interesting data point.  The failure is on a rhel7/grub2 root.
> The identical kernel on a rhel6/grub root boots.  So maybe
> grub2 brings out the failure?  I suspect Fedora19/grub2 on
> EFI should hit the problem (for someone looking to reproduce
> it).
> 
> In both cases the kernel boot line options are the same.

I'll bet that rhel7 is using the EFI handover protocol which uses the
internal mechanisms of the EFI boot stub.

I don't know whether anyone will be able to reproduce it, it looks like
it's a bug that's specific to your firmware.

-- 
Matt Fleming, Intel Open Source Technology Center
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