linux-kernel - Re: [PATCH v3] vdpa/mlx5: should not activate virtq object when suspended

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Message-ID: <CACGkMEsnLfrGOa2gqT8n9W4pFxnpHWwsmjokx2kqojo=O37O-Q@mail.gmail.com>
Date:   Thu, 16 Feb 2023 13:10:23 +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 v3] vdpa/mlx5: should not activate virtq object when suspended

On Thu, Feb 16, 2023 at 1:03 PM Si-Wei Liu <si-wei.liu@...cle.com> wrote:
>
>
>
> On 2/15/2023 8:48 PM, Jason Wang wrote:
> > On Wed, Feb 15, 2023 at 9:31 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>
> >> Reviewed-by: Eli Cohen <elic@...dia.com>
> >>
> >> ---
> >> v3: move suspended to struct mlx5_vdpa_dev
> >> v2: removed the change for improving warning message
> >> ---
> >>   drivers/vdpa/mlx5/core/mlx5_vdpa.h | 1 +
> >>   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 6 +++++-
> >>   2 files changed, 6 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/vdpa/mlx5/core/mlx5_vdpa.h b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> >> index 058fbe2..25fc412 100644
> >> --- a/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> >> +++ b/drivers/vdpa/mlx5/core/mlx5_vdpa.h
> >> @@ -96,6 +96,7 @@ struct mlx5_vdpa_dev {
> >>          struct mlx5_control_vq cvq;
> >>          struct workqueue_struct *wq;
> >>          unsigned int group2asid[MLX5_VDPA_NUMVQ_GROUPS];
> >> +       bool suspended;
> >>   };
> >>
> >>   int mlx5_vdpa_alloc_pd(struct mlx5_vdpa_dev *dev, u32 *pdn, u16 uid);
> >> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> >> index 3a6dbbc6..daac3ab 100644
> >> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> >> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> >> @@ -2411,7 +2411,7 @@ 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) || mvdev->suspended)
> > One more thought,
> >
> > Does this mean set_map() is forbidden during suspending?
> No, it will not. Instead it now allows set_map() to proceed even if
> mapping is shrinking while device is suspended. The "goto err_mr" below
> actually returns 0 when it leaves mlx5_vdpa_change_map().

You're right.

So

Acked-by: Jason Wang <jasowang@...hat.com>

Thanks

>
> -Siwei
>
> >   I'm not sure
> > this is correct or at least we need restrict in in the vDPA core.
> >
> > Thanks
> >
> >>                  goto err_mr;
> >>
> >>          restore_channels_info(ndev);
> >> @@ -2579,6 +2579,7 @@ static int mlx5_vdpa_reset(struct vdpa_device *vdev)
> >>          clear_vqs_ready(ndev);
> >>          mlx5_vdpa_destroy_mr(&ndev->mvdev);
> >>          ndev->mvdev.status = 0;
> >> +       ndev->mvdev.suspended = false;
> >>          ndev->cur_num_vqs = 0;
> >>          ndev->mvdev.cvq.received_desc = 0;
> >>          ndev->mvdev.cvq.completed_desc = 0;
> >> @@ -2815,6 +2816,8 @@ 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 +2827,7 @@ static int mlx5_vdpa_suspend(struct vdpa_device *vdev)
> >>                  suspend_vq(ndev, mvq);
> >>          }
> >>          mlx5_vdpa_cvq_suspend(mvdev);
> >> +       mvdev->suspended = true;
> >>          up_write(&ndev->reslock);
> >>          return 0;
> >>   }
> >> --
> >> 1.8.3.1
> >>
>