linux-kernel - Re: [PATCH v2 4/5] vduse: Support querying IOLTB information

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Message-ID: <CACycT3sUprAUDobiQH61ThJ+tYtjQ1rgZa143f-sjKv_bC9x1A@mail.gmail.com>
Date:   Thu, 14 Jul 2022 13:58:52 +0800
From:   Yongji Xie <xieyongji@...edance.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst <mst@...hat.com>, Liu Xiaodong <xiaodong.liu@...el.com>,
        Maxime Coquelin <maxime.coquelin@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        songmuchun@...edance.com,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/5] vduse: Support querying IOLTB information

On Thu, Jul 14, 2022 at 10:51 AM Jason Wang <jasowang@...hat.com> wrote:
>
> On Wed, Jul 6, 2022 at 1:06 PM Xie Yongji <xieyongji@...edance.com> wrote:
> >
> > This introduces a new ioctl: VDUSE_IOTLB_GET_INFO to
> > support querying IOLTB information such as bounce
> > buffer size.
> >
> > Signed-off-by: Xie Yongji <xieyongji@...edance.com>
> > ---
> >  drivers/vdpa/vdpa_user/vduse_dev.c | 13 +++++++++++++
> >  include/uapi/linux/vduse.h         | 17 +++++++++++++++++
> >  2 files changed, 30 insertions(+)
> >
> > diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> > index 3bc27de58f46..c47a5d9765cf 100644
> > --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> > +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> > @@ -1089,6 +1089,19 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
> >                 ret = vduse_dev_queue_irq_work(dev, &dev->vqs[index].inject);
> >                 break;
> >         }
> > +       case VDUSE_IOTLB_GET_INFO: {
>
> As discussed, it's better not to expose the VDUSE internal structure
> like "IOTLB" in the name.
>
> We probably need to extend GET_FD or have a new ioctl like GET_FD_INFO.
>

OK, will do it in v3.

Thanks,
Yongji