Re: [Xen-users] run X on dom0 on Hikey board got alignment fault

[Julien Grall <julien.grall@xxxxxxx>]

(CC Stefano)

On 13/05/16 01:44, Chenxiao Zhao wrote:
> Hi,
Hello,

> I have got GPU driver working on dom0 on my Hikey board. When I run
> startx in console, it terminated with bus error by signal 7.
>
> I traced the kernel and found there is an unhandled fault when X try to
> access a memory mapped address.
Memory mapped address to which physical address? Does this address 
belong to a device? If so which one?
> Kernel log:
> Unhandled fault: alignment fault (0x92000061) at 0x0000007f94aac004
>
> The address should be 4 bytes aligned. The X works well when I boot the
> same kernel without XEN. so I do not think this is caused by X codes.
> What did I miss?
>
> Anyone can advise the reason causes this issue and how I can fix it?
The first idea that come to my mind is the memory is mapped as device by 
Xen whilst Linux maps as normal. Because of stage-2/stage-1 memory 
combination, the memory would be mapped as device and therefore all 
access should be aligned.
I would recommend you to track down where exactly X is trying to access 
(device, RAM...).
Regards,

--
Julien Grall

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