netdev - [PATCH v5 13/22] virtio_pci: queue_reset: reserve vq->priv for re-enable queue

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Date:   Mon, 14 Feb 2022 16:14:07 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>, bpf@...r.kernel.org
Subject: [PATCH v5 13/22] virtio_pci: queue_reset: reserve vq->priv for re-enable queue

Reserve vq->priv during reset. Prevent vp_modern_map_vq_notify() from
being called repeatedly.

Only set vq->priv = NULL in normal setup virtqueue, and keep
vq->priv in the process of re-enable queue.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/virtio/virtio_pci_modern.c | 8 +++++---
 drivers/virtio/virtio_ring.c       | 2 ++
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 5af82948f0ae..bed3e9b84272 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -224,10 +224,12 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 				virtqueue_get_avail_addr(vq),
 				virtqueue_get_used_addr(vq));
 
-	vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL);
 	if (!vq->priv) {
-		err = -ENOMEM;
-		goto err_map_notify;
+		vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL);
+		if (!vq->priv) {
+			err = -ENOMEM;
+			goto err_map_notify;
+		}
 	}
 
 	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index b37753bdbbc4..6a892c8ea16e 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1723,6 +1723,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
 
 		vq->vq.callback = callback;
 		vq->vq.name = name;
+		vq->vq.priv = NULL;
 		vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
 			!context;
 	}
@@ -2211,6 +2212,7 @@ static int __vring_init_virtqueue(struct virtqueue *_vq,
 	if (!reset) {
 		vq->vq.callback = callback;
 		vq->vq.name = name;
+		vq->vq.priv = NULL;
 		vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
 			!context;
 	}
-- 
2.31.0