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authorDavid Vrabel <david.vrabel@citrix.com>2013-03-15 10:55:41 +0000
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-01-06 10:07:52 -0500
commitbf2bbe07f13846a90d4447521d87566d6f87bc0e (patch)
tree930d312f8d74a5892fb37429969de6016cc3eb6a /drivers/xen/events/events_base.c
parent0dc0064add422bc0ef5165ebe9ece3052bbd457d (diff)
downloadlinux-bf2bbe07f13846a90d4447521d87566d6f87bc0e.tar.bz2
xen/events: Add the hypervisor interface for the FIFO-based event channels
Add the hypercall sub-ops and the structures for the shared data used in the FIFO-based event channel ABI. The design document for this new ABI is available here: http://xenbits.xen.org/people/dvrabel/event-channels-H.pdf In summary, events are reported using a per-domain shared event array of event words. Each event word has PENDING, LINKED and MASKED bits and a LINK field for pointing to the next event in the event queue. There are 16 event queues (with different priorities) per-VCPU. Key advantages of this new ABI include: - Support for over 100,000 events (2^17). - 16 different event priorities. - Improved fairness in event latency through the use of FIFOs. The ABI is available in Xen 4.4 and later. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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