linux-kernel - Re: [RFC 1/3] vdpa/mlx5: reset iotlb at dup

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Date:   Mon, 16 Jan 2023 19:16:15 +0100
From:   Eugenio Perez Martin <eperezma@...hat.com>
To:     Eli Cohen <elic@...dia.com>
Cc:     "mst@...hat.com" <mst@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Parav Pandit <parav@...dia.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "sgarzare@...hat.com" <sgarzare@...hat.com>,
        "si-wei.liu@...cle.com" <si-wei.liu@...cle.com>
Subject: Re: [RFC 1/3] vdpa/mlx5: reset iotlb at dup_iotlb

On Mon, Jan 16, 2023 at 7:32 AM Eli Cohen <elic@...dia.com> wrote:
>
> > From: Eugenio Pérez <eperezma@...hat.com>
> > Sent: Thursday, 12 January 2023 16:22
> > To: mst@...hat.com; Eli Cohen <elic@...dia.com>
> > Cc: linux-kernel@...r.kernel.org; Parav Pandit <parav@...dia.com>;
> > lulu@...hat.com; jasowang@...hat.com; virtualization@...ts.linux-
> > foundation.org; sgarzare@...hat.com; si-wei.liu@...cle.com
> > Subject: [RFC 1/3] vdpa/mlx5: reset iotlb at dup_iotlb
> >
> > Regular memory region changes already reset cvq iotlb at set_map.
> > However this is not true if CVQ and data VQs are in different ASID.
> >
> > Clean the CVQ iotlb every time we hit dup_iotlb.
> >
> > Fixes: 8fcd20c30704 ("vdpa/mlx5: Support different address spaces for
> > control and data")
> > Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
> > ---
> >  drivers/vdpa/mlx5/core/mr.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
> > index 0a1e0b0dc37e..ae34dcac9a3f 100644
> > --- a/drivers/vdpa/mlx5/core/mr.c
> > +++ b/drivers/vdpa/mlx5/core/mr.c
> > @@ -456,6 +456,8 @@ static int dup_iotlb(struct mlx5_vdpa_dev *mvdev,
> > struct vhost_iotlb *src)
> >       u64 start = 0, last = ULLONG_MAX;
> >       int err;
> >
> > +     vhost_iotlb_reset(mvdev->cvq.iotlb);
> > +
>
> As far as I can see, mlx5_vdpa_destroy_mr() is called independently of the asid
> and it will calls prune_iotlb() which resets the cvq iotlb. Am I missing something?
>

Sorry, my fault. It is not obvious from the patch but this prepares the code for
the next patch in the series.

With the next patch applied, prune_iotlb is not called in all
contexts. This patch may be dropped in future series.

Thanks!


> >       if (!src) {
> >               err = vhost_iotlb_add_range(mvdev->cvq.iotlb, start, last,
> > start, VHOST_ACCESS_RW);
> >               return err;
> > --
> > 2.31.1
>