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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 7/8] evtchn: add FIFO-based event channel ABI
On 20/03/13 10:32, Jan Beulich wrote: >>>> On 19.03.13 at 22:00, David Vrabel <david.vrabel@xxxxxxxxxx> wrote: >> From: David Vrabel <david.vrabel@xxxxxxxxxx> >> >> Add the event channel hypercall sub-ops and the definitions for the >> shared data structures for the FIFO-based event channel ABI. >> >> The design document for this new ABI is available here: >> >> http://xenbits.xen.org/people/dvrabel/event-channels-C.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). > > As said in a comment on the design doc B, I'm missing a way for > the guest to learn the width of the involved mask (17 here, but > obviously there is nothing preventing this from being 16, 18, or > yet some other implementation specific value <= 29). I haven't forgotten this. I was focusing on the core implementation so not all the design review feedback has been incorporated yet. David _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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