linux-kernel - RE: Re: [PATCH v2 3/3] efi: Capsule update with user helper interface

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Date:	Wed, 25 Feb 2015 12:38:20 +0000
From:	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Andy Lutomirski <luto@...capital.net>,
	Sam Protsenko <semen.protsenko@...aro.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	Ming Lei <ming.lei@...onical.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Ong, Boon Leong" <boon.leong.ong@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
Subject: RE: Re: [PATCH v2 3/3] efi: Capsule update with user helper
 interface

> -----Original Message-----
> From: Borislav Petkov [mailto:bp@...en8.de]
> Sent: Wednesday, February 25, 2015 7:48 PM
> 
> On Tue, Feb 24, 2015 at 12:49:09PM +0000, Kweh, Hock Leong wrote:
> 
> So this sounds pretty overengineered for no reason, or maybe I'm missing
> the reason.
> 
> If I had to give an example from the microcode loader, what we do there
> is put the microcode in /lib/firmware/... and do
> 
> echo 1 > /sys/devices/system/cpu/microcode/reload
> 
> which goes and calls reload_store() in
> arch/x86/kernel/cpu/microcode/core.c which grabs a mutex, disables CPU
> hotplug, etc, etc...
> 
> And this mechanism is as simple as it can get. Maybe capsules can be
> loaded like that too?
> 
> Error code can be propagated too, if needed, of course.
> 
> --
> Regards/Gruss,
>     Boris.
> 
> ECO tip #101: Trim your mails when you reply.
> --

Hi Boris,

The reason we use this interface for efi capsule is that efi capsule
support multi binaries to be uploaded and each binary file name
can be different.


Regards,
Wilson