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[Xen-devel] when xen will do callback?

I did see that in setup.c, there that hypercall to setup callbacks like
hypervisor_callback, but when xen will issue the callback?  Everytime a
domain issues a hypervisor call, xen will issue the callback function?

Also, I noticed that hypervisor_callback() will in turn call
evtchn_do_upcall, which seems to convert the pending flags to the
correspond virq and does doIRQ() to emulating irq injection. Is that

Thanks for your help.


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