linux-kernel - [PATCH] vdpa/mlx5: should not activate virtq object when suspended

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Date:   Fri, 10 Feb 2023 22:08:14 -0800
From:   Si-Wei Liu <si-wei.liu@...cle.com>
To:     mst@...hat.com, jasowang@...hat.com, elic@...dia.com
Cc:     parav@...dia.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] vdpa/mlx5: should not activate virtq object when suspended

Otherwise the virtqueue object to instate could point to invalid address
that was unmapped from the MTT:

  mlx5_core 0000:41:04.2: mlx5_cmd_out_err:782:(pid 8321):
  CREATE_GENERAL_OBJECT(0xa00) op_mod(0xd) failed, status
  bad parameter(0x3), syndrome (0x5fa1c), err(-22)

While at it, add warning message to tell apart which object is
responsible for the CREATE_GENERAL_OBJECT command failure.

Fixes: cae15c2ed8e6 ("vdpa/mlx5: Implement susupend virtqueue callback")
Cc: Eli Cohen <elic@...dia.com>
Signed-off-by: Si-Wei Liu <si-wei.liu@...cle.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 3a6dbbc6..c05c7f6 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -165,6 +165,7 @@ struct mlx5_vdpa_net {
 	u32 cur_num_vqs;
 	u32 rqt_size;
 	bool nb_registered;
+	bool suspended;
 	struct notifier_block nb;
 	struct vdpa_callback config_cb;
 	struct mlx5_vdpa_wq_ent cvq_ent;
@@ -1245,12 +1246,18 @@ static int setup_vq(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq)
 		goto err_connect;
 
 	err = counter_set_alloc(ndev, mvq);
-	if (err)
+	if (err) {
+		mlx5_vdpa_warn(&ndev->mvdev, "failed to alloc counter on vq idx %d(%d)\n",
+			       idx, err);
 		goto err_counter;
+	}
 
 	err = create_virtqueue(ndev, mvq);
-	if (err)
+	if (err) {
+		mlx5_vdpa_warn(&ndev->mvdev, "failed to create virtqueue idx %d(%d)\n",
+			       idx, err);
 		goto err_connect;
+	}
 
 	if (mvq->ready) {
 		err = modify_virtqueue(ndev, mvq, MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY);
@@ -2411,7 +2418,7 @@ static int mlx5_vdpa_change_map(struct mlx5_vdpa_dev *mvdev,
 	if (err)
 		goto err_mr;
 
-	if (!(mvdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
+	if (!(mvdev->status & VIRTIO_CONFIG_S_DRIVER_OK) || ndev->suspended)
 		goto err_mr;
 
 	restore_channels_info(ndev);
@@ -2580,6 +2587,7 @@ static int mlx5_vdpa_reset(struct vdpa_device *vdev)
 	mlx5_vdpa_destroy_mr(&ndev->mvdev);
 	ndev->mvdev.status = 0;
 	ndev->cur_num_vqs = 0;
+	ndev->suspended = false;
 	ndev->mvdev.cvq.received_desc = 0;
 	ndev->mvdev.cvq.completed_desc = 0;
 	memset(ndev->event_cbs, 0, sizeof(*ndev->event_cbs) * (mvdev->max_vqs + 1));
@@ -2815,6 +2823,8 @@ static int mlx5_vdpa_suspend(struct vdpa_device *vdev)
 	struct mlx5_vdpa_virtqueue *mvq;
 	int i;
 
+	mlx5_vdpa_info(mvdev, "suspending device\n");
+
 	down_write(&ndev->reslock);
 	ndev->nb_registered = false;
 	mlx5_notifier_unregister(mvdev->mdev, &ndev->nb);
@@ -2824,6 +2834,7 @@ static int mlx5_vdpa_suspend(struct vdpa_device *vdev)
 		suspend_vq(ndev, mvq);
 	}
 	mlx5_vdpa_cvq_suspend(mvdev);
+	ndev->suspended = true;
 	up_write(&ndev->reslock);
 	return 0;
 }
-- 
1.8.3.1