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

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Message-ID: <20130528105041.GP14575@console-pimps.org>
Date:	Tue, 28 May 2013 11:50:41 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Russ Anderson <rja@....com>
Cc:	Matthew Garrett <matthew.garrett@...ula.com>,
	"matt.fleming@...el.com" <matt.fleming@...el.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [regression, bisected] x86: efi: Pass boot services variable
 info to runtime code

On Fri, 24 May, at 03:49:38PM, Russ Anderson wrote:
> Why does the kernel still try to create /sys/firmware/efivars/
> entries in the original failure even though efi_call_phys4()
> failed?  Or does it always try to create those entries
> and GetNextVariable() blows up in the original failure
> but not in my experiment?

CONFIG_EFI_VARS will try to create /sys/firmware/efivars even without
the additional info from the early EFI boot variable code. The early
variable code is only a heuristic that is supposed to improve the
anti-bricking algorithm in the EFI variable code.

-- 
Matt Fleming, Intel Open Source Technology Center
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