linux-kernel - Re: [PATCH 06/16] vdpa/mlx5: Take cvq iotlb lock during refresh

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Date:   Tue, 26 Sep 2023 11:33:06 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Dragos Tatulea <dtatulea@...dia.com>
Cc:     Eugenio Pérez <eperezma@...hat.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Parav Pandit <parav@...dia.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, kvm@...r.kernel.org
Subject: Re: [PATCH 06/16] vdpa/mlx5: Take cvq iotlb lock during refresh

On Tue, Sep 12, 2023 at 9:02 PM Dragos Tatulea <dtatulea@...dia.com> wrote:
>
> The reslock is taken while refresh is called but iommu_lock is more
> specific to this resource. So take the iommu_lock during cvq iotlb
> refresh.
>
> Based on Eugenio's patch [0].
>
> [0] https://lore.kernel.org/lkml/20230112142218.725622-4-eperezma@redhat.com/
>
> Suggested-by: Eugenio Pérez <eperezma@...hat.com>
> Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>

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

Thanks

> ---
>  drivers/vdpa/mlx5/core/mr.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
> index fcb6ae32e9ed..587300e7c18e 100644
> --- a/drivers/vdpa/mlx5/core/mr.c
> +++ b/drivers/vdpa/mlx5/core/mr.c
> @@ -590,11 +590,19 @@ int mlx5_vdpa_update_cvq_iotlb(struct mlx5_vdpa_dev *mvdev,
>                                 struct vhost_iotlb *iotlb,
>                                 unsigned int asid)
>  {
> +       int err;
> +
>         if (mvdev->group2asid[MLX5_VDPA_CVQ_GROUP] != asid)
>                 return 0;
>
> +       spin_lock(&mvdev->cvq.iommu_lock);
> +
>         prune_iotlb(mvdev);
> -       return dup_iotlb(mvdev, iotlb);
> +       err = dup_iotlb(mvdev, iotlb);
> +
> +       spin_unlock(&mvdev->cvq.iommu_lock);
> +
> +       return err;
>  }
>
>  int mlx5_vdpa_create_dma_mr(struct mlx5_vdpa_dev *mvdev)
> --
> 2.41.0
>