[PATCH 4/4] powerpc/eeh: Avoid event on passed PE

Gavin Shan gwshan at linux.vnet.ibm.com
Wed May 21 14:41:34 EST 2014

On Wed, May 21, 2014 at 10:12:11AM +1000, Benjamin Herrenschmidt wrote:
>On Tue, 2014-05-20 at 21:56 +1000, Gavin Shan wrote:
> .../...
>> >I think what you want is an irqfd that the in-kernel eeh code
>> >notifies when it sees a failure. When such an fd exists, the kernel
>> >skips its own error handling.
>> >
>> Yeah, it's a good idea and something for me to improve in phase II. We
>> can discuss for more later. For now, what I have in my head is something
>> like this:
>However, this would be a deviation from (or extension of) PAPR. At the
>moment, the way things work in PAPR is that the guest is responsible for
>querying the EEH state when something "looks" like an error (ie, getting
>ff's back). This is also how it works in pHyp.
>We have an interrupt path in the host when doing "native" EEH, and it
>would be nice to extend PAPR to also be able to shoot an event to the
>guest possibly using RTAS events, but let's get the basics working and
>upstream first.

Got it. Thanks, Ben :-)


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