linux-kernel - Re: [PATCH v2] vdpa/mlx5: should not activate virtq object when suspended

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Date:   Tue, 14 Feb 2023 14:20:06 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>
Cc:     mst@...hat.com, elic@...dia.com, parav@...dia.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, eperezma@...hat.com
Subject: Re: [PATCH v2] vdpa/mlx5: should not activate virtq object when suspended

On Tue, Feb 14, 2023 at 6:48 AM Si-Wei Liu <si-wei.liu@...cle.com> wrote:
>
> 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)
>
> 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>
>
> ---
> v2: removed the change for improving warning message
> ---
>  drivers/vdpa/mlx5/net/mlx5_vnet.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 3a6dbbc6..d7e8ca0 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;

Any reason we make this net specific? (or is it better to use
mlx5_vdpa_dev structure?)


>         struct notifier_block nb;
>         struct vdpa_callback config_cb;
>         struct mlx5_vdpa_wq_ent cvq_ent;
> @@ -2411,7 +2412,7 @@ 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 +2581,7 @@ 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 +2817,8 @@ static int mlx5_vdpa_suspend(struct vdpa_device *vdev)
>         struct mlx5_vdpa_virtqueue *mvq;
>         int i;
>
> +       mlx5_vdpa_info(mvdev, "suspending device\n");
> +

Is this better to show the info after the device has been suspended?

Thanks

>         down_write(&ndev->reslock);
>         ndev->nb_registered = false;
>         mlx5_notifier_unregister(mvdev->mdev, &ndev->nb);
> @@ -2824,6 +2828,7 @@ 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
>