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

[Avi Kivity]

On 07/05/2010 10:36 AM, Jan Kiszka wrote:
> > Assumes that CPU with
> > lowest index is BSP (that one we can actually guaranty if we want
> > to).
> >      
> Well, the generic solution would be returning a bitmap of the CPUs that
> were affected, but this is impractical. However, at least x86 should be
> fine with the information "state change also on BSP", e.g. like this:
>   0 - state change on one or more CPUs, none of them is the BSP
>   1 - state change on BSP (and possible more CPUs)
>    

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.

It's more involved, but provides more information.



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