linux-kernel - Re: [regression, bisected] fails to boot on Dell Optiplex 760 with VT-d enabled

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Date:	Mon, 17 Aug 2009 23:17:03 +0100
From:	David Woodhouse <david.woodhouse@...el.com>
To:	Faidon Liambotis <paravoid@...ian.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Han, Weidong" <weidong.han@...el.com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"Kay, Allen M" <allen.m.kay@...el.com>,
	"Yu, Fenghua" <fenghua.yu@...el.com>
Subject: Re: [regression, bisected] fails to boot on Dell Optiplex 760 with
 VT-d enabled

On Mon, 2009-08-17 at 14:27 -0700, Faidon Liambotis wrote:
> I am experiencin a bug on an Dell Optiplex 760 with a configuration that
> has an Intel Core2 Q9550 CPU and with an up-to-date BIOS, version A03.
> 
> When "VT for Direct I/O" is enabled in the BIOS, v2.6.30 boots and works
> perfectly, while v2.6.31-rc1..rc6 fail (both of them x86-64).
> 
> More specifically, I get an endless loop of printing the following
> messages in
> the screen:
>         DMAR: [DMA Read] Request device [ff:1f.7] fault addr
>               fffffffffffff000
>         DMAR: [fault reason 255] Unknown
> and the boot process doesn't move on from there.

Is it fixed by http://git.infradead.org/iommu-2.6.git/commit/0815565a ?

I strongly suspect you weren't actually using the IOMMU in your
'working' 2.6.30 kernel? Can you show a full log of that one booting?

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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