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Re: [Xen-devel] Latest xen-3.4-testing hangs on boot with iommu=1, on a

To: Tom Rotenberg <tom.rotenberg@xxxxxxxxx>
Subject: Re: [Xen-devel] Latest xen-3.4-testing hangs on boot with iommu=1, on a Lenovo T500
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Thu, 16 Jul 2009 11:00:48 +0100
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Thread-topic: [Xen-devel] Latest xen-3.4-testing hangs on boot with iommu=1, on a Lenovo T500
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Did you upgrade the BIOS since your last successful test? There have been
problems which can persist across warm reboots. So did you power cycle
between tests?

 -- Keir

On 16/07/2009 10:54, "Tom Rotenberg" <tom.rotenberg@xxxxxxxxx> wrote:

> Just bisected the tree, and i found out, that it's not because of Xen,
> since even 19607 (which worked for me last time) didn't work. I tried
> to play a little bit with some of the BIOS settings, but it didn't
> help.
> It looks like it's some kind of an hardware problem, which causes the
> whole machine to freeze, when trying to work with the IOMMU. Any
> suggestions on what to do next? to whom should i send this
> information?
> Tom
> On Thu, Jul 16, 2009 at 11:26 AM, Tom Rotenberg<tom.rotenberg@xxxxxxxxx>
> wrote:
>> It didn't help.
>> I will bisect the tree to find the problem.
>> On Wed, Jul 15, 2009 at 8:11 PM, Keir Fraser<keir.fraser@xxxxxxxxxxxxx>
>> wrote:
>>> I'd say changesets 19625 and 19632 are most likely suspects. You could try
>>> reverting those patches, or updating your tree to just before those
>>> changesets, and see if that helps.
>>>  -- Keir
>>> On 15/07/2009 18:03, "Tom Rotenberg" <tom.rotenberg@xxxxxxxxx> wrote:
>>>> The last version, i have tried and tested (and it worked), was:
>>>> changeset 19607: 1ac7832a2fcd
>>>> author: Keir Fraser <keir.fraser@xxxxxxxxxx>
>>>> date: Mon May 18 13:54:48 2009 +0100
>>>> files: README
>>>> On Wed, Jul 15, 2009 at 7:58 PM, Keir Fraser<keir.fraser@xxxxxxxxxxxxx>
>>>> wrote:
>>>>> On 15/07/2009 17:01, "Tom Rotenberg" <tom.rotenberg@xxxxxxxxx> wrote:
>>>>>> I have cloned the latest xen 3,4 testing tree, changeset 19696:
>>>>>>         22ef8e900a6d (i386: fix handling of Xen entries in final L2 page
>>>>>> table), and i have installed it on a Lenovo T500 machine, with VT-d
>>>>>> enabled.
>>>>> When did it last work with the 3.4 tree?
>>>>>  -- Keir

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