Jason Wang
2021-Mar-23 03:02 UTC
[PATCH v5 03/11] vhost-vdpa: protect concurrent access to vhost device iotlb
? 2021/3/15 ??1:37, Xie Yongji ??:> 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 at bytedance.com>Acked-by: Jason Wang <jasowang at redhat.com> Please cc stable for next version. Thanks> --- > 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; > }