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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 20 Nov 2014, Julien Grall wrote:
> 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.

I don't have a gicv3 test environment ready but it works on xgene too

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