linux-kernel - Re: [PATCH v5 1/5] ARM: add basic Trusted Foundations support

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Message-ID: <CACRpkdaphSqM1oOphC-t1UPmkxaEemC3R3aDfEXb79GWNNyNMA@mail.gmail.com>
Date:	Fri, 6 Sep 2013 18:48:15 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Dave Martin <Dave.Martin@....com>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Kevin Hilman <khilman@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 1/5] ARM: add basic Trusted Foundations support

On Thu, Sep 5, 2013 at 5:27 AM, Alexandre Courbot <acourbot@...dia.com> wrote:

> Trusted Foundations is a TrustZone-based secure monitor for ARM that
> can be invoked  using a consistent SMC-based API on all supported
> platforms. This patch adds initial basic support for Trusted
> Foundations using the ARM firmware API. Current features are limited
> to the ability to boot secondary processors.
>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> Reviewed-by: Tomasz Figa <t.figa@...sung.com>
> Reviewed-by: Stephen Warren <swarren@...dia.com>

I take it that this means that it is a set of standard routines
living in the secure world that can be called by way of this
API, correct? The commit message is written a bit like
everybody knows what this is about but I don't :-)

Some more background here would be nice, like where did this
thing come from, and are there other platforms in existance that
use trusted foundations or is it a Tegra-only thing? Does a
specification of this thing listing available services exist for
example?

How does it relate to the (arch-neutral) trusted execution
environment and such things that other vendors are pushing for?
Can the trusted foundations be used "underneath" such
frameworks for trusted applications, or is it a parallell thing
altogether?

Simple things like that...

I tried googling it, is this a relevant URL?
http://www.arm.com/community/partners/display_product/rw/ProductId/5393/

Thanks,
Linus Walleij
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