linux-kernel - Re: [PATCH V2] vdpa/mlx5: preserve CVQ vringh index

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Message-ID: <CACGkMEsNcuQNt+9od6D+O_RbxKcpG8U14zBSibRYz91SXiwZ7A@mail.gmail.com>
Date:   Thu, 2 Nov 2023 16:15:18 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Eugenio Perez Martin <eperezma@...hat.com>
Cc:     Steve Sistare <steven.sistare@...cle.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>, Eli Cohen <elic@...dia.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Dragos Tatulea <dtatulea@...dia.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: Re: [PATCH V2] vdpa/mlx5: preserve CVQ vringh index

On Thu, Nov 2, 2023 at 3:10 PM Eugenio Perez Martin <eperezma@...hat.com> wrote:
>
> On Wed, Nov 1, 2023 at 4:55 PM Steve Sistare <steven.sistare@...cle.com> wrote:
> >
> > mlx5_vdpa does not preserve userland's view of vring base for the control
> > queue in the following sequence:
> >
> > ioctl VHOST_SET_VRING_BASE
> > ioctl VHOST_VDPA_SET_STATUS VIRTIO_CONFIG_S_DRIVER_OK
> >   mlx5_vdpa_set_status()
> >     setup_cvq_vring()
> >       vringh_init_iotlb()
> >         vringh_init_kern()
> >           vrh->last_avail_idx = 0;
> > ioctl VHOST_GET_VRING_BASE
> >
> > To fix, restore the value of cvq->vring.last_avail_idx after calling
> > vringh_init_iotlb.
> >
>
> Fixes tag missing?

+1

>
> Apart from that,
>
> Acked-by: Eugenio Pérez <eperezma@...hat.com>

With the fix tag added.

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

Thanks

>
> > Signed-off-by: Steve Sistare <steven.sistare@...cle.com>
> > ---
> >  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 946488b8989f..ca972af3c89a 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -2795,13 +2795,18 @@ static int setup_cvq_vring(struct mlx5_vdpa_dev *mvdev)
> >         struct mlx5_control_vq *cvq = &mvdev->cvq;
> >         int err = 0;
> >
> > -       if (mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ))
> > +       if (mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ)) {
> > +               u16 idx = cvq->vring.last_avail_idx;
> > +
> >                 err = vringh_init_iotlb(&cvq->vring, mvdev->actual_features,
> >                                         MLX5_CVQ_MAX_ENT, false,
> >                                         (struct vring_desc *)(uintptr_t)cvq->desc_addr,
> >                                         (struct vring_avail *)(uintptr_t)cvq->driver_addr,
> >                                         (struct vring_used *)(uintptr_t)cvq->device_addr);
> >
> > +               if (!err)
> > +                       cvq->vring.last_avail_idx = cvq->vring.last_used_idx = idx;
> > +       }
> >         return err;
> >  }
> >
> > --
> > 2.39.3
> >
>