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The comments of vfio kernel module said that individual subindex
interrupts can be disabled using the -1 value for DATA_EVENTFD or
the index can be disabled as a whole with:
flags = (DATA_NONE|ACTION_TRIGGER), count = 0.
Signed-off-by: Wu Zongyong <wuzongyong@linux.alibaba.com>
CC: Liu Jiang <gerry@linux.alibaba.com>