linux-kernel - Re: [GIT PATCH] more Driver core patches for 2.6.19

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Message-ID: <20061214093028.GF6674@rhun.haifa.ibm.com>
Date:	Thu, 14 Dec 2006 11:30:28 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Linus Torvalds <torvalds@...l.org>, Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: [GIT PATCH] more Driver core patches for 2.6.19

On Wed, Dec 13, 2006 at 10:15:47PM +0100, Arjan van de Ven wrote:

> with DRI you have the case where "something" needs to do security
> validation of the commands that are sent to the card. (to avoid a
> non-privileged user to DMA all over your memory)

We also have the interesting case where your card is behind an
isolation-capable IOMMU, so if you let userspace program it, you need
a userspace-accessible DMA-API for IOMMU mappings (or to pre-map
everything in the IOMMU, which loses on some of the benefits of
isolation-capable IOMMUs (i.e., only map what you need to use right
now)).

Cheers,
Muli
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