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

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Message-ID: <1369953129.11620.15.camel@x230>
Date:	Thu, 30 May 2013 22:32:09 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	Russ Anderson <rja@....com>
CC:	joeyli <jlee@...e.com>, Jiri Kosina <jkosina@...e.cz>,
	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, 2013-05-30 at 17:28 -0500, Russ Anderson wrote:
> On Thu, May 30, 2013 at 10:21:53PM +0000, Matthew Garrett wrote:
> > On Thu, 2013-05-30 at 17:17 -0500, 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.

We want to know how much space is used by variables that aren't visible
at runtime.

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