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Xen 3.0 Virtualization Interface Guide
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2.3 Interrupts and events

Interrupts are virtualized by mapping them to event channels, which are delivered asynchronously to the target domain using a callback supplied via the set_callbacks() hypercall. A guest OS can map these events onto its standard interrupt dispatch mechanisms. Xen is responsible for determining the target domain that will handle each physical interrupt source. For more details on the binding of event sources to event channels, see Chapter 8.

Xen 3.0 Virtualization Interface Guide
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  Published under the terms of the GNU General Public License Design by Interspire