some question about xhci TRB_INTR_TARGET

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hi all:
from xhci spec, Interrupter Target is the value between 0 and MaxIntrs-1.
But why the parameter pass to TRB_INTR_TARGTRB_INTR_TARGET is always 0.

Does that mean so far xhci host didn't support multi-interrupt as
MSI-X suggested?

Thanks for your help in advance,
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