linux-kernel - Re: [RFC PATCH] xen: privcmd: fix ioeventfd/ioreq crashing PV domain

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Message-ID: <1dc70410-310a-4a00-8c47-0eebdb023267@gmail.com>
Date: Sat, 18 Oct 2025 20:42:02 -0400
From: Demi Marie Obenour <demiobenour@...il.com>
To: val@...isiblethingslab.com
Cc: jgross@...e.com, linux-kernel@...r.kernel.org,
 oleksandr_tyshchenko@...m.com, sstabellini@...nel.org,
 xen-devel@...ts.xenproject.org
Subject: Re: [RFC PATCH] xen: privcmd: fix ioeventfd/ioreq crashing PV domain

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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