[Xen-devel] Implement 3-level event channels in Xen.

[Wei Liu <wei.liu2@xxxxxxxxxx>]

This patch series implements 3-level event channel routines in Xen.

The implementation is as followed:
  * Add a field evtchn_level in struct domain.
  * Add pointers in struct domain to point to 3-level shared array.
  * Add 2nd level selector in struct vcpu.
  * Add a new op in do_event_channel_op to register n-level evtchn.

The exposed interface for registering is extendable, however only 3-level is
supported at the moment.

The routines for 3-level evtchns are more or less the same as 2-level ones.


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