powerpc/vas: Register NX with fault window ID and IRQ port value
For each user space send window, register NX with fault window ID and port value so that NX paste CRBs in this fault FIFO when it sees fault on the request buffer. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1587016888.2275.1054.camel@hbabu-laptop
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