xen/interface/event_channel.h

5  * Event channels between domains.
16  * `incontents 150 evtchn Event Channels
18  * Event channels are the basic primitive provided by Xen for event
19  * notifications. An event is the Xen equivalent of a hardware
20  * interrupt. They essentially store one bit of information, the event
24  * indicating when an event arrives (setting the bit). Further
26  * guests must check the value of the bit after re-enabling event
29  * Event notifications can be masked by setting a flag; this is
33  * Event channels are represented by the evtchn_* fields in
41  * @cmd  == EVTCHNOP_* (event-channel operation).
85  * EVTCHNOP_bind_interdomain: Construct an interdomain event channel between
91  * In case the peer domain has already tried to set our event channel
93  * the local event channel pending.
96  * handler) is as follows: (Re-enable the event channel for subsequent
114  * EVTCHNOP_bind_virq: Bind a local event channel to VIRQ <irq> on specified
121  *  3. Per-vcpu VIRQs may be bound to at most one event channel per vcpu.
122  *     The allocated event channel is bound to the specified vcpu and the
135  * EVTCHNOP_bind_pirq: Bind a local event channel to a real IRQ (PIRQ <irq>).
137  *  1. A physical IRQ may be bound to at most one event channel per domain.
151  * EVTCHNOP_bind_ipi: Bind a local event channel to receive events.
153  *  1. The allocated event channel is bound to the specified vcpu. The binding
164  * EVTCHNOP_close: Close a local event channel <port>. If the channel is
175  * EVTCHNOP_send: Send an event to the remote end of the channel whose local
189  *  2. Only a sufficiently-privileged domain may obtain the status of an event
221  * event is pending.
239  * EVTCHNOP_unmask: Unmask the specified local event-channel port and deliver
240  * a notification to the appropriate VCPU if an event is pending.
249  * EVTCHNOP_reset: Close all event channels associated with specified domain.
253  *  3. Destroys all control blocks and event array, resets event channel
268  * will be lost.  Guests should call this before binding any event to
283  * EVTCHNOP_expand_array: add an additional page to the event array.
292  * EVTCHNOP_set_priority: set the priority for an event channel.