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#228517: powerpc/powernv: Add a driver for the POWER9 XIVE interrupt controller
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Description

#228517: powerpc/powernv: Add a driver for the POWER9 XIVE interrupt controller

The XIVE (External Interrupt Virtualization Engine) is a new interrupt
controller present in IBM's POWER9 processor. It's a very powerful,
very complex device using queues and shared memory to improve interrupt
dispatch performance in a virtualized environment.

This yields a ~10% performance improvment over the XICS emulation mode,
measured in both buildworld, and 'dd' from nvme to /dev/null.

Currently, this only supports native access.

MFC after: 1 month

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jhibbitsAuthored on Feb 2 2019, 4:15 AM

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