From: David Woodhouse <david.woodhouse@intel.com>
To: Faidon Liambotis <paravoid@debian.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Siddha, Suresh B" <suresh.b.siddha@intel.com>,
"Han, Weidong" <weidong.han@intel.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"Kay, Allen M" <allen.m.kay@intel.com>,
"Yu, Fenghua" <fenghua.yu@intel.com>
Subject: Re: [regression, bisected] fails to boot on Dell Optiplex 760 with VT-d enabled
Date: Mon, 17 Aug 2009 23:17:03 +0100 [thread overview]
Message-ID: <1250547423.7405.362.camel@macbook.infradead.org> (raw)
In-Reply-To: <4A89CB52.4030008@debian.org>
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@intel.com Intel Corporation
next prev parent reply other threads:[~2009-08-17 22:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-17 21:27 [regression, bisected] fails to boot on Dell Optiplex 760 with VT-d enabled Faidon Liambotis
2009-08-17 22:17 ` David Woodhouse [this message]
2009-08-17 22:59 ` Faidon Liambotis
2009-08-17 23:11 ` Chris Wright
2009-08-17 23:22 ` Faidon Liambotis
2009-08-17 23:29 ` Chris Wright
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