RE: [Xen-devel] HVM windows - PCI IRQ firing on both CPU's

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> On 18/8/08 11:53, "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
wrote:
> 
> > The first number is the timestamp (why is the TSC so far out of
whack
> > between CPU's??? Is that a hardware thing or a Xen thing? It causes
huge
> > problems with 'ping' too!!!), the second is the isr that is running.
> >
> > Why is the ISR getting run again immediately on the other CPU? Is
this
> > an OS thing or am I not acking the interrupt correctly?
> 
> You should be checking and clearing only vcpu0's evtchn_upcall_pending
and
> evtchn_pending_sel fields. Other vcpu's equivalent fields are
currently
> unused for HVM guests. It is essential that you clear
> evtchn_upcall_pending
> -- that is the 'virtual interrupt wire' connected to the virtual PIC's
> level-triggered input pin.

Just so I understand, even if I see the IRQ on CPU1, I should always
treat it as if it came in on CPU0?

The lack of that would explain what I'm seeing.

Thanks

James 

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