Re: [Xen-devel] [PATCH 3/3] evtchn/fifo: don't spin indefinitely when setting LINK

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 06/11/13 15:01, Boris Ostrovsky wrote:
> On 11/06/2013 08:38 AM, David Vrabel wrote:
>> 
>> Given the non-obvious locking required for this to be safe and the
>> overhead of the guest having to do a unmask hypercall more often.  I
>> think I will fix this differently.
>>
>> A new BUSY bit is added to the event word.  Xen sets BUSY prior to
>> updating the LINK field and then clears it when the LINK field is set.
>>
>> When the guest unmasks an event it must spin waiting for BUSY to clear
>> before it clears the MASKED bit.  It then need only do the unmask
>> hypercall if the event is pending (as before).
>>
>> Draft H and v3 of this series to follow.
> 
> Will there be a new Linux series as well?

Yes, but only the final patch in the series will change.

David

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