vfio/common: Introduce vfio_set_irq_signaling helper
The code used to assign an interrupt index/subindex to an eventfd is duplicated many times. Let's introduce an helper that allows to set/unset the signaling for an ACTION_TRIGGER, ACTION_MASK or ACTION_UNMASK action. In the error message, we now use errno in case of any VFIO_DEVICE_SET_IRQS ioctl failure. Signed-off-by: NEric Auger <eric.auger@redhat.com> Reviewed-by: NCornelia Huck <cohuck@redhat.com> Reviewed-by: NLi Qiang <liq3ea@gmail.com> Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
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