Re: [Xen-devel] [PATCH v2 for-4.5] xen/arm: clear UIE on hypervisor entry

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 11/20/2014 11:02 AM, Julien Grall wrote:
> Hi Stefano,
> 
> On 11/20/2014 10:53 AM, Stefano Stabellini wrote:
>> UIE being set can cause maintenance interrupts to occur when Xen writes
>> to one or more LR registers. The effect is a busy loop around the
>> interrupt handler in Xen
>> (http://marc.info/?l=xen-devel&m=141597517132682): everything gets stuck.
>>
>> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
>> Reported-and-Tested-by: Andrii Tseglytskyi 
>> <andrii.tseglytskyi@xxxxxxxxxxxxxxx>
>> CC: konrad.wilk@xxxxxxxxxx
>> ---
>>
>> Konrad, this fixes an actual bug, at least on OMAP5. It should have no
>> bad side effects on any other platforms as far as I can tell. It should
>> go in 4.5.
> 
> From Andrii's mail, there is a bad side effect. We can receive spurious
> interrupt.
> 
> On V1, you said that you tried this patch on midway. I would prefer if
> you give a try on  platform that would really be used (such as xgene or
> seattle). As we know Midway won't be used in prod.

And maybe give a try to gicv3 too as it's common code.

Regards,

-- 
Julien Grall

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