Re: [Xen-devel] SMMU, Unhandled context fault

[Peng Fan <van.freenix@xxxxxxxxx>]

On Tue, May 03, 2016 at 11:58:17AM +0100, Julien Grall wrote:
>On 29/04/16 15:28, Peng Fan wrote:
>>Hi Julien,
>
>Hello Peng,
>
>>On Thu, Apr 28, 2016 at 02:14:58PM +0100, Julien Grall wrote:
>>>>Is there any big difference between XEN SMMU driver and linux SMMU driver?
>>>>I know that XEN only support Stage 2. But the initliaization flow is almost 
>>>>the same.
>>>
>>>The SMMU driver for Xen is a port from Linux 3.19-rc0. Since then the Linux
>>>driver has been reworked and it might be possible that we have missed some
>>>bug fix.
>>>
>>>Aside that, for Xen, the page tables are always shared between the SMMU and
>>>the processor.
>>
>>Thanks. I shared two picture that dumped using TRACE32.
>>
>>https://drive.google.com/file/d/0B9ruJqJLIGp7cHhhSFNSNC00MHc/view?usp=sharing
>>https://drive.google.com/file/d/0B9ruJqJLIGp7dmlqVllXYTIxajQ/view?usp=sharing
>>
>>Would you please help check?
>
>I am sorry but I have got no idea what each columns are supposed to contain.
>Can you share more details?

I add one more picture.
https://drive.google.com/file/d/0B9ruJqJLIGp7SUJOSUVPR1dHRFk/view?usp=sharing
The first colum is guest physical address, the second is machine address.

The FSR 0x40000410, EF is 1, TF is 0. This means the mapping is correct, but 
there
is an external fault during translation?
The PTWF shows An external fault occurred while processing a translation table 
walk
I may need to check what kind external fault, it maybe not a mapping error.

Thanks,
Peng.

>
>Regards,
>
>-- 
>Julien Grall

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