[Xen-devel] Re: [Fedora-xen] Xorg on JF 2.6.31-rc8 with xen 3.5 unstable, stacktrace with >4096M of dom0_mem

[Jeremy Fitzhardinge]

On 09/08/09 12:34, Konrad Rzeszutek Wilk wrote:
> On Tue, Sep 08, 2009 at 10:22:46PM +0300, Pasi Kärkkäinen wrote:
>   
>> On Tue, Sep 08, 2009 at 12:14:54PM -0700, Boris Derzhavets wrote:
>>     
>>> Console drops into the same stack trace in  both cases.
>>>
>>>       
>> Jeremy: Any ideas could some recent change in pv_ops dom0 kernel cause
>> usb stuff to stop working with >4096M of dom0 memory? 
>>     
> The last set of changes in Jeremy's kernel are a set of patches I sent,
> so the problem is most likely caused by my work.
>   

Yes, I suspect so.  Last time around, USB was good for highlighting
problems in the swiotlb code.  If there's a problem at 4G then generally
its some physical address being accidentally truncated by an implicit
cast in the middle of an expression.  Or something else.

(Why, yes, I am helpful today.)

    J

> A dmesg from both Xen and Linux kernel would be most helpfull. Also
> a lspci -vvv would be nice.
>
> And as Pasi suggested, booting the same kernel without Xen would
> be most helpful.
>
>
>   
>> dom0_mem=4096M works
>> dom0_mem=4097M fails with stacktrace
>>
>> Boris: What was the last kernel that worked without backtraces? 
>> Also, does that same kernel work as baremetal (without Xen) ?
>>     
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