linux-kernel - Re: [PATCH vhost 15/16] vdpa/mlx5: Make iotlb helper functions more generic

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Date:   Thu, 5 Oct 2023 12:16:58 +0000
From:   Dragos Tatulea <dtatulea@...dia.com>
To:     "eperezma@...hat.com" <eperezma@...hat.com>
CC:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Gal Pressman <gal@...dia.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "xuanzhuo@...ux.alibaba.com" <xuanzhuo@...ux.alibaba.com>
Subject: Re: [PATCH vhost 15/16] vdpa/mlx5: Make iotlb helper functions more
 generic

On Thu, 2023-10-05 at 12:14 +0200, Eugenio Perez Martin wrote:
> On Thu, Sep 28, 2023 at 6:50 PM Dragos Tatulea <dtatulea@...dia.com> wrote:
> > 
> > They will be used in a followup patch.
> > 
> > Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
> > ---
> >  drivers/vdpa/mlx5/core/mr.c | 16 ++++++++--------
> >  1 file changed, 8 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
> > index 3dee6d9bed6b..a4135c16b5bf 100644
> > --- a/drivers/vdpa/mlx5/core/mr.c
> > +++ b/drivers/vdpa/mlx5/core/mr.c
> > @@ -454,20 +454,20 @@ static void destroy_dma_mr(struct mlx5_vdpa_dev
> > *mvdev, struct mlx5_vdpa_mr *mr)
> >         mlx5_vdpa_destroy_mkey(mvdev, mr->mkey);
> >  }
> > 
> > -static int dup_iotlb(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb *src)
> > +static int dup_iotlb(struct vhost_iotlb *iotlb, struct vhost_iotlb *src)
> 
> It would be great to move this patch to vhost/iotlb, especially
> because it can be reused by vdpa_sim. But it can be done on top for
> sure,
> 
Ack. Will create a separate patch for this after the series.

Thanks,
Dragos

> Acked-by: Eugenio Pérez <eperezma@...hat.com>
> 
> >  {
> >         struct vhost_iotlb_map *map;
> >         u64 start = 0, last = ULLONG_MAX;
> >         int err;
> > 
> >         if (!src) {
> > -               err = vhost_iotlb_add_range(mvdev->cvq.iotlb, start, last,
> > start, VHOST_ACCESS_RW);
> > +               err = vhost_iotlb_add_range(iotlb, start, last, start,
> > VHOST_ACCESS_RW);
> >                 return err;
> >         }
> > 
> >         for (map = vhost_iotlb_itree_first(src, start, last); map;
> >                 map = vhost_iotlb_itree_next(map, start, last)) {
> > -               err = vhost_iotlb_add_range(mvdev->cvq.iotlb, map->start,
> > map->last,
> > +               err = vhost_iotlb_add_range(iotlb, map->start, map->last,
> >                                             map->addr, map->perm);
> >                 if (err)
> >                         return err;
> > @@ -475,9 +475,9 @@ static int dup_iotlb(struct mlx5_vdpa_dev *mvdev, struct
> > vhost_iotlb *src)
> >         return 0;
> >  }
> > 
> > -static void prune_iotlb(struct mlx5_vdpa_dev *mvdev)
> > +static void prune_iotlb(struct vhost_iotlb *iotlb)
> >  {
> > -       vhost_iotlb_del_range(mvdev->cvq.iotlb, 0, ULLONG_MAX);
> > +       vhost_iotlb_del_range(iotlb, 0, ULLONG_MAX);
> >  }
> > 
> >  static void destroy_user_mr(struct mlx5_vdpa_dev *mvdev, struct
> > mlx5_vdpa_mr *mr)
> > @@ -544,7 +544,7 @@ void mlx5_vdpa_destroy_mr_resources(struct mlx5_vdpa_dev
> > *mvdev)
> >         for (int i = 0; i < MLX5_VDPA_NUM_AS; i++)
> >                 mlx5_vdpa_destroy_mr(mvdev, mvdev->mr[i]);
> > 
> > -       prune_iotlb(mvdev);
> > +       prune_iotlb(mvdev->cvq.iotlb);
> >  }
> > 
> >  static int _mlx5_vdpa_create_mr(struct mlx5_vdpa_dev *mvdev,
> > @@ -596,8 +596,8 @@ int mlx5_vdpa_update_cvq_iotlb(struct mlx5_vdpa_dev
> > *mvdev,
> > 
> >         spin_lock(&mvdev->cvq.iommu_lock);
> > 
> > -       prune_iotlb(mvdev);
> > -       err = dup_iotlb(mvdev, iotlb);
> > +       prune_iotlb(mvdev->cvq.iotlb);
> > +       err = dup_iotlb(mvdev->cvq.iotlb, iotlb);
> > 
> >         spin_unlock(&mvdev->cvq.iommu_lock);
> > 
> > --
> > 2.41.0
> > 
>