Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull vhost fixes from Michael Tsirkin:
 "Some last minute vhost,vdpa fixes.

  The last two of them haven't been in next but they do seem kind of
  obvious, very small and safe, fix bugs reported in the field, and they
  are both in a new mlx5 vdpa driver, so it's not like we can introduce
  regressions"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vdpa/mlx5: Fix dependency on MLX5_CORE
  vdpa/mlx5: should keep avail_index despite device status
  vhost-vdpa: fix page pinning leakage in error path
  vhost-vdpa: fix vhost_vdpa_map() on error condition
  vhost: Don't call log_access_ok() when using IOTLB
  vhost: Use vhost_get_used_size() in vhost_vring_set_addr()
  vhost: Don't call access_ok() when using IOTLB
  vhost vdpa: fix vhost_vdpa_open error handling

1 files changed, 14 insertions, 6 deletions

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 70676a6d1691..74264e590695 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1133,15 +1133,17 @@ static void suspend_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *m
 	if (!mvq->initialized)
 		return;
 
-	if (query_virtqueue(ndev, mvq, &attr)) {
-		mlx5_vdpa_warn(&ndev->mvdev, "failed to query virtqueue\n");
-		return;
-	}
 	if (mvq->fw_state != MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY)
 		return;
 
 	if (modify_virtqueue(ndev, mvq, MLX5_VIRTIO_NET_Q_OBJECT_STATE_SUSPEND))
 		mlx5_vdpa_warn(&ndev->mvdev, "modify to suspend failed\n");
+
+	if (query_virtqueue(ndev, mvq, &attr)) {
+		mlx5_vdpa_warn(&ndev->mvdev, "failed to query virtqueue\n");
+		return;
+	}
+	mvq->avail_idx = attr.available_index;
 }
 
 static void suspend_vqs(struct mlx5_vdpa_net *ndev)
@@ -1411,8 +1413,14 @@ static int mlx5_vdpa_get_vq_state(struct vdpa_device *vdev, u16 idx, struct vdpa
 	struct mlx5_virtq_attr attr;
 	int err;
 
-	if (!mvq->initialized)
-		return -EAGAIN;
+	/* If the virtq object was destroyed, use the value saved at
+	 * the last minute of suspend_vq. This caters for userspace
+	 * that cares about emulating the index after vq is stopped.
+	 */
+	if (!mvq->initialized) {
+		state->avail_index = mvq->avail_idx;
+		return 0;
+	}
 
 	err = query_virtqueue(ndev, mvq, &attr);
 	if (err) {