conf: Add a new xenbus controller option for event channels
Event channels are like PV interrupts and in conjuction with grant frames form a data transfer mechanism for PV drivers. They are also used for inter-processor interrupts. Guests with a large number of vcpus and/or many PV devices many need to increase the maximum default value of 1023. For this reason the native Xen config format supports the 'max_event_channels' setting. See xl.cfg(5) man page for more details. Similar to the existing maxGrantFrames option, add a new xenbus controller option 'maxEventChannels', allowing to adjust the maximum value via libvirt. Signed-off-by: NJim Fehlig <jfehlig@suse.com> Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>
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