Re: [Qemu-devel] Re: [Bug 599958] Re: Timedrift problems with Win7: hpet missing time drift fixups

[Avi Kivity]

On 07/05/2010 12:07 PM, Jan Kiszka wrote:
> > What about ack notifiers?  Ask the APIC to notify you when an interrupt
> > is acked.  That allows you to track the BSP, all cpus, or some subset.
> > Masking can be seen at the irq controller level.
> >      
> So, if I understand you correctly, an IRQ state change that is ignored
> due to masking would invoke the ack notifier chain as well?
>    

No - the cpu doesn't ack, no ack notifier.

We might need a separate mask notifier.  Just add pomodoro sauce.

> > It's more involved, but provides more information.
> >      
> Well, it requires to establish ack notifier chains in parallel to the
> existing IRQ delivery routes. Definitely more invasive.
>    

Right, and need to plumb it twice, once for qemu and once for kvm.

But my feeling is you get a lot more information out of it.

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