linux-kernel - [RFC 0/2] Lift restriction about VDUSE net devices with CVQ

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Message-ID: <20251007130622.144762-1-eperezma@redhat.com>
Date: Tue,  7 Oct 2025 15:06:20 +0200
From: Eugenio Pérez <eperezma@...hat.com>
To: mst@...hat.com
Cc: Yongji Xie <xieyongji@...edance.com>,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Eugenio Pérez <eperezma@...hat.com>,
	Maxime Coquelin <mcoqueli@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Dragos Tatulea DE <dtatulea@...dia.com>,
	jasowang@...hat.com
Subject: [RFC 0/2] Lift restriction about VDUSE net devices with CVQ

An userland device implemented through VDUSE could take rtnl forever if the
virtio-net driver is running on top of virtio_vdpa.  Let's break the device
if it does not return the buffer in a longer-than-assumible timeout.

A less agressive path can be taken to recover the device, like only resetting
the control virtqueue.  However, the state of the device after this action is
taken races, as the vq could be reset after the device writes the OK.  Leaving
TODO anyway.

Eugenio Pérez (2):
  virtio_net: timeout control virtqueue commands
  vduse: lift restriction about net devices with CVQ

 drivers/net/virtio_net.c           | 10 ++++++++++
 drivers/vdpa/vdpa_user/vduse_dev.c |  3 ---
 2 files changed, 10 insertions(+), 3 deletions(-)

-- 
2.51.0