linux-kernel - Re: [patch 01/22] AMD IOMMU: enable device isolation per default

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Message-ID: <20081218130015.GA1420@ucw.cz>
Date:	Thu, 18 Dec 2008 14:00:15 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Domenico Andreoli <cavokz@...il.com>, Willy Tarreau <w@....eu>,
	Rodrigo Rubira Branco <rbranco@...checkpoint.com>,
	Jake Edge <jake@....net>, Eugene Teo <eteo@...hat.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Joerg Roedel <joerg.roedel@....com>
Subject: Re: [patch 01/22] AMD IOMMU: enable device isolation per default

On Tue 2008-12-16 16:03:53, Greg KH wrote:
> 2.6.27-stable review patch.  If anyone has any objections, please let us know.
> 
> ------------------
> 
> From: Joerg Roedel <joerg.roedel@....com>
> 
> commit 3ce1f93c6d53c3f91c3846cf66b018276c8ac2e7 upstream.
> 
> Impact: makes device isolation the default for AMD IOMMU
> 
> Some device drivers showed double-free bugs of DMA memory while testing
> them with AMD IOMMU. If all devices share the same protection domain
> this can lead to data corruption and data loss. Prevent this by putting
> each device into its own protection domain per default.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

This does not look like 'fix for a serious bug' to
me. stable_kernel_rules.txt says '...not a "this could be a problem"
type thing'.

Yes, maybe iommu is mature enough that we want it enabled, but...

(Or maybe Documentation/stable_kernel_rules.txt needs updating. The
patch for penguin dirty feet already got in.....)
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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