From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: pvops: boot locks up while initialising PCI
Date: Wed, 23 Sep 2009 16:29:10 -0700
Message-ID: <4ABAAF46.2090403@goop.org>
References: <20090923230503.GA11263@verge.net.au>
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To: Simon Horman <horms@verge.net.au>
Cc: xen-devel@lists.xensource.com, Keir Fraser <keir.fraser@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org

On 09/23/09 16:05, Simon Horman wrote:
> On Wed, Sep 23, 2009 at 12:17:23PM -0700, Jeremy Fitzhardinge wrote:
>   
>> On 09/22/09 22:32, Simon Horman wrote:
>>     
>>> Hi,
>>>
>>> while trying to boot xen/master at the following changest the boot
>>> locks up somewhere around the initialisation of PCI. Boot log and
>>> config attached. Any insights appreciated.
>>>
>>> commit 398b4b4cabdb27c06a7b8214c2044347ffc08c49
>>> Merge: 3973dcf... 6e8f158...
>>> Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
>>> Date:   Tue Sep 22 15:21:28 2009 -0700
>>>
>>>     Merge branch 'xen/dom0/drm' into xen/master
>>>
>>>     * xen/dom0/drm:
>>>       swiotlb: linux/swiotlb.h needs linux/dma-mapping.h
>>>
>>>
>>> My grub snippet is:
>>>
>>> title           Xen
>>> root            (hd0,0)
>>> kernel          /xen com1=115200,8n1,0x3f8,0 console=com1 loglvl=all guest_loglvl=all dom0_mem=1G
>>> module          /vmlinuz-2.6.31-pvops root=/dev/mapper/sam-root_x86_64 console=ttyS0 loglevel=8 ro earlyprintk=xen
>>> module          /initrd.img-2.6.31-pvops
>>>
>>>   
>>>       
>> You should really be using hvc0 for the console.  I think ttyS0
>> "passthrough"/emulation should work, but using the Xen console is more
>> reliable.  And you're just losing all console output on the switchover,
>> which suggests that serial isn't actually working.  Failing that, can
>> you get more info from the VGA console?
>>     
> Hi Jeremy, Hi Pasi,
>
> Thanks for the advice with regards to hvc0, that is working well.
> I am now observing a problem while initialising the iommu.
> I have worked around this by setting iommu=off.
>   

Ah, OK, someone else noticed that too.  I guess we should inhibit iommu
init somehow.

Keir, is Xen supposed to disable the DMAR for dom0 by stomping on acpi
or something?  Or was that about something else?

    J