s390/airq: allow for airq structure that uses an input vector

When doing device passthrough where interrupts are being forwarded from
host to guest, we wish to use a pinned section of guest memory as the
vector (the same memory used by the guest as the vector). To accomplish
this, add a new parameter for airq_iv_create which allows passing an
existing vector to be used instead of allocating a new one. The caller
is responsible for ensuring the vector is pinned in memory as well as for
unpinning the memory when the vector is no longer needed.

A subsequent patch will use this new parameter for zPCI interpretation.

Reviewed-by: Thomas Huth <[email protected]>
Reviewed-by: Pierre Morel <[email protected]>
Reviewed-by: Claudio Imbrenda <[email protected]>
Acked-by: Cornelia Huck <[email protected]>
Signed-off-by: Matthew Rosato <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Borntraeger <[email protected]>

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