Philippe Gerum wrote:
> Jan Kiszka wrote:
>> I love KVM - not only because I'm heavily hacking on it now, also
>> because it is so easy to trigger various kinds of guest issues with
>> it (SMP host + threaded virtual CPUs => true SMP guest - and if you
>> want to watch fancy things happen, just load one host core).
>>
>> Here is one I found that way:
>>
>> void fastcall __ipipe_sync_stage(unsigned long syncmask)
>> {
>> [ ... ]
>> while ((mask = (ipipe_this_cpudom_var(irqpend_himask) & syncmask)) !=
>> 0) {
>> level = __ipipe_ffnz(mask);
>>
>> while ((submask = ipipe_this_cpudom_var(irqpend_lomask)[level])
>> != 0) {
>> rank = __ipipe_ffnz(submask);
>> irq = (level << IPIPE_IRQ_ISHIFT) + rank;
>>
>> if (test_bit(IPIPE_LOCK_FLAG, &ipd->irqs[irq].control))
>> {
>> __clear_bit(rank,
>> &ipipe_this_cpudom_var(irqpend_lomask)[level]);
> - continue;
> + goto rpm_needs_more_neurons;
>> }
>>
>> __clear_bit(rank,
>> &ipipe_this_cpudom_var(irqpend_lomask)[level]);
>>
> + rpm_needs_more_neurons:
>> if (ipipe_this_cpudom_var(irqpend_lomask)[level] == 0)
>> __clear_bit(level,
>> &ipipe_this_cpudom_var(irqpend_himask));
>> [ ... ]
>>
Of course, I'm not saying this is the real fix, but that just points at a
possible issue. I do want those 100 points on my score card.
>> Who sees the deadlock? 100 points for the right answer! But be quick,
>> I'm already hacking on a fix. :)
>>
>> Jan
>>
>>
>>
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>>
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>
>
--
Philippe.
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