[PATCH v6 03/10] vhost-vdpa: protect concurrent access to vhost device iotlb
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STALE2000d
REVIEWED: 3 (2M)
From: Xie Yongji <hidden>
Date: 2021-03-31 08:07:24
Also in:
kvm, linux-fsdevel
Subsystem:
the rest, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang, Eugenio Pérez
Revision v6 of 9 in this series; 2 review trailers.
Revisions (9)
Use vhost_dev->mutex to protect vhost device iotlb from
concurrent access.
Fixes: 4c8cf318("vhost: introduce vDPA-based backend")
Cc: stable@vger.kernel.org
Signed-off-by: Xie Yongji <redacted>
Acked-by: Jason Wang <redacted>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.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 3947fbc2d1d5..63b28d3aee7c 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c@@ -725,9 +725,11 @@ 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:
@@ -748,6 +750,8 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, r = -EINVAL; break; } +unlock: + mutex_unlock(&dev->mutex); return r; }
--
2.11.0