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

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Message-ID: <20130531025438.GB24287@sgi.com>
Date:	Thu, 30 May 2013 21:54:38 -0500
From:	Russ Anderson <rja@....com>
To:	Matthew Garrett <matthew.garrett@...ula.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, May 30, 2013 at 10:32:09PM +0000, Matthew Garrett wrote:
> 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.

We want to boot.  We could boot up through 3.9-rc7.

Knowing how much space is used by variables that aren't
visible at runtime it moot if you can't boot.


And again, maybe this is a bios bug - we have bios people
looking into it - and maybe that call _should_ work, but
the fact is the kernel booted without that change[1] and does
not boot with it.  


[1] commit cc5a080c5d40c36089bb08a8a16fa3fc7047fe0f

Thanks,
-- 
Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc          rja@....com
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