[Linuxppc-users] XICS Interrupts

[Bill Buros]

Got a good question last night..



When I run a customer‘s application on an S822lc(8335-GCA) system with 
Ubuntu OS BareMetal, there are many XICS interrupts in /proc/interrupts.

Does anyone know the conditions to trigger the interrupt. What is XICS?

I saw some text that said it was related to KVM, but I do not use 
virtualization at all.


XICS interrupt controller

Device type supported: KVM_DEV_TYPE_XICS

Groups:
  KVM_DEV_XICS_SOURCES
  Attributes: One per interrupt source, indexed by the source number.

This device emulates the XICS (eXternal Interrupt Controller
Specification) defined in PAPR.  The XICS has a set of interrupt
sources, each identified by a 20-bit source number, and a set of
Interrupt Control Presentation (ICP) entities, also called "servers",
each associated with a virtual CPU.