K 10
svn:author
V 6
royger
K 8
svn:date
V 27
2015-02-16T16:30:42.352299Z
K 7
svn:log
V 540
xen/intr: improve PIRQ handling

Improve and cleanup the Xen PIRQ event channel code:

 - Remove the xi_shared field as it is unused.
 - Clean the "pending" bit in the EOI handler, this is more similar to how
   native interrupts are handled.
 - Don't mask edge triggered PIRQs, edge trigger interrupts cannot be
   masked.
 - Panic if PHYSDEVOP_eoi fails.
 - Remove the usage of the PHYSDEVOP_alloc_irq_vector hypercall because
   it's just a no-op in the Xen versions that are supported by FreeBSD Dom0.

Sponsored by: Citrix Systems R&D

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