netdev - [PATCH v5 03/11] vhost-vdpa: protect concurrent access to vhost device iotlb

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Date:   Mon, 15 Mar 2021 13:37:13 +0800
From:   Xie Yongji <xieyongji@...edance.com>
To:     mst@...hat.com, jasowang@...hat.com, stefanha@...hat.com,
        sgarzare@...hat.com, parav@...dia.com, bob.liu@...cle.com,
        hch@...radead.org, rdunlap@...radead.org, willy@...radead.org,
        viro@...iv.linux.org.uk, axboe@...nel.dk, bcrl@...ck.org,
        corbet@....net, mika.penttila@...tfour.com,
        dan.carpenter@...cle.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH v5 03/11] vhost-vdpa: protect concurrent access to vhost device iotlb

Use vhost_dev->mutex to protect vhost device iotlb from
concurrent access.

Fixes: 4c8cf318("vhost: introduce vDPA-based backend")
Signed-off-by: Xie Yongji <xieyongji@...edance.com>
---
 drivers/vhost/vdpa.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index cb14c66eb2ec..3f7175c2ac24 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -719,9 +719,11 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
 	const struct vdpa_config_ops *ops = vdpa->config;
 	int r = 0;
 
+	mutex_lock(&dev->mutex);
+
 	r = vhost_dev_check_owner(dev);
 	if (r)
-		return r;
+		goto unlock;
 
 	switch (msg->type) {
 	case VHOST_IOTLB_UPDATE:
@@ -742,6 +744,8 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
 		r = -EINVAL;
 		break;
 	}
+unlock:
+	mutex_unlock(&dev->mutex);
 
 	return r;
 }
-- 
2.11.0