[PATCH v8 04/14] powerpc/vas: Alloc and setup IRQ and trigger port address

[Nicholas Piggin]

Haren Myneni's on March 19, 2020 4:14 pm:
> 
> Alloc IRQ and get trigger port address for each VAS instance. Kernel
> register this IRQ per VAS instance and sets this port for each send
> window. NX interrupts the kernel when it sees page fault.

Again, should cc Cedric and Greg for XIVE / interrupt stuff. And
for patch 2/14.

The changelogs could use a bit of work. They're hard to read, and it can 
be a bit hard to decipher "why".

  Allocate a xive irq on each chip with a vas instance. The NX 
  coprocessor raises a host CPU interrupt via vas if it encounters a
  page fault on an effective address. Subsequent patches register the
  trigger port with the NX coprocessor, and create a vas fault handler
  for this interrupt mapping.

Don't know if the technical details are correct, but something like that
in structure.

Thanks,
Nick