linux-kernel - Re: [PATCH 5/5] efi: Capsule update support and pstore backend

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Date:	Thu, 17 Oct 2013 12:55:14 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>,
	Seiji Aguchi <seiji.aguchi@....com>, x86@...nel.org,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 5/5] efi: Capsule update support and pstore backend

On Wed, 16 Oct, at 03:19:39PM, Matthew Garrett wrote:
> On Wed, Oct 16, 2013 at 02:51:00PM +0100, Matt Fleming wrote:
> 
> > +	  Many EFI machines have buggy implementations of the UpdateCapsule()
> > +	  runtime service. This option will enable code that may not function
> > +	  correctly with your firmware.
> 
> Where by "May not function correctly" you mean "May crash the system"? 

Bingo.

> I'm a little uneasy having this run by default if enabled, even if it's 
> disabled by default in the config.

What would be the canonical way to enable this feature then? Have a file
along the lines of /sys/kernel/debug/capsule_enable, where a user would
be required to,

  echo 1 > /sys/kernel/debug/capsule_enable

to turn on the functionality?

-- 
Matt Fleming, Intel Open Source Technology Center
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