I'm pretty sure Xen doesn't support ioeventfd at all yet. There are two options:
1. Port the backend to use an ioreq server instead of ioeventfd. 2. Modify Linux (and possibly Xen) to support ioeventfd. Which virtio device are you trying to implement? virtio-GPU will need a lot of additional work and it would probably be best to discuss this privately (over a call or similar). Others are likely to be significantly easier. -- Sincerely, Demi Marie Obenour (she/her/hers)
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