RE: [Xen-devel] pvops: boot locks up while initialising PCI

["Han, Weidong" <weidong.han@xxxxxxxxx>]

Jeremy Fitzhardinge wrote:
> 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@xxxxxxxxxx>
>>>> 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?
> 

Now Xen will zap ACPI DMAR signature to prevent dom0 using VT-d. pv-ops dom0 
shouldn't use VT-d.

Simon, I noticed you use xen c/s 20010, pls try xen c/s 20181. 

Regards,
Weidong




Regards,
Weidong

>     J
> 
> 
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