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

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Message-ID: <alpine.LNX.2.00.1305310029560.30576@pobox.suse.cz>
Date:	Fri, 31 May 2013 00:30:43 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Russ Anderson <rja@....com>
Cc:	Matthew Garrett <matthew.garrett@...ula.com>,
	joeyli <jlee@...e.com>, Matt Fleming <matt@...sole-pimps.org>,
	"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 Thu, 30 May 2013, Russ Anderson wrote:

> > > That's a great idea.  This patch moves the QueryVariableInfo()
> > > call from bootime to runtime, in efi_late_init().  The attached
> > > patch is consistent with the UEFI spec and avoids the problem.
> > 
> > No, that defeats the entire point of the original patch.
> 
> How so?  It is still calling QueryVariableInfo()
> before the data is used.

You lose information provided by QueryVariableInfo() about boot-only 
variables once the transition boot -> runtime has happened.

-- 
Jiri Kosina
SUSE Labs
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