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Tsirkin" , Jason Wang , Xuan Zhuo , Eugenio =?iso-8859-1?Q?P=E9rez?= , Stefan Hajnoczi , Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , virtualization@lists.linux.dev, kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Xiang Mei , Bobby Eshleman Subject: Re: [PATCH v3 1/2] vsock/virtio: read virtqueues under worker locks Message-ID: References: <20260729185831.3247971-1-bestswngs@gmail.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Jul 29, 2026 at 12:16:54PM -0700, Weiming Shi wrote: > Commit bd50c5dc182b ("vsock/virtio: add support for device > suspend/resume") made the *_run flags transition from false to true when > restore installs replacement virtqueues. The RX, TX and event workers > read their virtqueue before locking and checking the corresponding flag, > so a worker delayed across freeze and restore can observe the replacement > queue's running state while retaining a pointer to the deleted queue. > > Read each virtqueue under its mutex after checking the run flag, keeping > the pointer and state in the same queue generation. > > Fixes: bd50c5dc182b ("vsock/virtio: add support for device suspend/resume") > Cc: stable@vger.kernel.org > Reported-by: Xiang Mei > Link: https://lore.kernel.org/r/20260727035804.1860862-1-bestswngs@gmail.com > Assisted-by: OpenAI-Codex:gpt-5 > Signed-off-by: Weiming Shi > --- > net/vmw_vsock/virtio_transport.c | 11 ++++++----- > 1 file changed, 6 insertions(+), 5 deletions(-) > > diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c > index 57f2d6ec3ffc..a8e1dd95ba8c 100644 > --- a/net/vmw_vsock/virtio_transport.c > +++ b/net/vmw_vsock/virtio_transport.c > @@ -346,12 +346,13 @@ static void virtio_transport_tx_work(struct work_struct *work) > struct virtqueue *vq; > bool added = false; > > - vq = vsock->vqs[VSOCK_VQ_TX]; > mutex_lock(&vsock->tx_lock); > > if (!vsock->tx_run) > goto out; > > + vq = vsock->vqs[VSOCK_VQ_TX]; > + > do { > struct sk_buff *skb; > unsigned int len; > @@ -451,13 +452,13 @@ static void virtio_transport_event_work(struct work_struct *work) > container_of(work, struct virtio_vsock, event_work); > struct virtqueue *vq; > > - vq = vsock->vqs[VSOCK_VQ_EVENT]; > - > mutex_lock(&vsock->event_lock); > > if (!vsock->event_run) > goto out; > > + vq = vsock->vqs[VSOCK_VQ_EVENT]; > + > do { > struct virtio_vsock_event *event; > unsigned int len; > @@ -634,13 +635,13 @@ static void virtio_transport_rx_work(struct work_struct *work) > container_of(work, struct virtio_vsock, rx_work); > struct virtqueue *vq; > > - vq = vsock->vqs[VSOCK_VQ_RX]; > - > mutex_lock(&vsock->rx_lock); > > if (!vsock->rx_run) > goto out; > > + vq = vsock->vqs[VSOCK_VQ_RX]; > + > do { > virtqueue_disable_cb(vq); > for (;;) { > -- > 2.55.0 > Reviewed-by: Bobby Eshleman