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[Xen-devel] trying to understand interrupts from xen->guest

I'm enabling interrupts by this:
_shared->vcpu_data[0].evtchan_upcall_pending = 0;

I get an interrupt but the stack is really odd. I can't make sense of it. 
Nothing looks like it is in the right place, though bits and pieces are 
recognizable: I can see the address for _shared, for example on the stack. 

I'm trying to find out where Xen might have invoked the interrupt but no 
luck. Plan 9 is mostly working and I want to get Xen interrupts going to 
it, but this last bit is puzzling. 

I do have the callback addresses set. 

Does xen interrupt on vector 0x82 to send interrupts to the guest? This is  
a guest in dom > 0.


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