Re: [Xen-devel] IRQ SMP affinity problems in domU with vcpus > 4 on HP ProLiant G6 with dual Xeon 5540 (Nehalem)

[Qing He <qing.he@xxxxxxxxx>]

On Fri, 2009-10-16 at 17:01 +0800, Qing He wrote:
> Yes, it is the algorithm used today.
> 
> After reviewing the code, if the guest really does something like
> changing affinity within the window between an irq fire and eoi,
> there is indeed a problem, attached is the patch. Although I kinda
> doubt it, shouldn't desc->lock in guest protect and make these two
> operations mutual exclusive.
> 
> Dante,
> Can you see if this patch helps?

Please ignore this patch, I intended to use it to see if this can
confirm the analysis (in the cost of interrupt losses), but it may
actually bring more severe problems.

Thanks,
Qing

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