[loongarch64] virtio-console cannot run after merging dev-loongarch to dev

[enkerewpo]

after merging new functionalities from dev in hvisor and from main in hvisor-tool (ivc, etc.), the virtio-console's input from root linux can not be working anymore.

[enkerewpo]

I did some investigation, after merging into dev, the input to /dev/pts/0 from root linux seems not working. the virtio init and virtio output to /dev/pts/0 are ok as usual.

however, when echo test > /dev/pts/0 or just type something inside screen /dev/pts/0, nothing happens. After checking virtio daemon's log, there're no logs about any INPUT events so no data was transmitted through virtio-console into nonroot

[enkerewpo]

I think problems may related to epoll handling, so I will first try to learn the details of the linux's epoll design and debug the hvisor-tool running in loongarch64 linux (v6.11.6).