When virtio devices get stopped, tell the kernel to unbind the mapping between interrupts and eventfds. Note: it behaves differently from other NICs which close eventfds, free struct. In virtio, we do those things when close device in following patch. Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com> Tested-by: Lei Yao <lei.a.yao@intel.com> Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>