Re: [Xen-devel] [PATCH 7/8] evtchn: add FIFO-based event channel ABI

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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).

Jan


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