linux-kernel - Re: [RFC] How implement Secure Data Path ?

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Date:	Tue, 5 May 2015 09:27:52 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Thierry Reding <treding@...dia.com>,
	Dave Airlie <airlied@...hat.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Tom Gall <tom.gall@...aro.org>
Subject: Re: [RFC] How implement Secure Data Path ?

On Tue, May 05, 2015 at 05:39:57PM +0200, Benjamin Gaignard wrote:
> Since few months I'm looking for Linaro to how do Secure Data Path (SPD).
> I have tried and implemented multiple thinks but I always facing architecture
> issues so I would like to get your help to solve the problem.
> 
> First what is Secure Data Path ? SDP is a set of hardware features to garanty
> that some memories regions could only be read and/or write by specific hardware
> IPs. You can imagine it as a kind of memory firewall which grant/revoke
> accesses to memory per devices. Firewall configuration must be done in a trusted
> environment: for ARM architecture we plan to use OP-TEE + a trusted
> application to do that.
> 
> One typical use case for SDP in a video playback which involve those elements:
> decrypt -> video decoder -> transform -> display

Sounds like a good enough reason not to implement it ever.
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