linux-kernel - Re: [RFC 1/4] vduse: Add the struct to save the vq reconnect info

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Message-ID: <CACGkMEtowYUowpsBvkYe3AUADwYgOcxbHW=-f=45u2vNTz9CUA@mail.gmail.com>
Date:   Mon, 3 Jul 2023 14:25:25 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Cindy Lu <lulu@...hat.com>
Cc:     mst@...hat.com, maxime.coquelin@...hat.com,
        xieyongji@...edance.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [RFC 1/4] vduse: Add the struct to save the vq reconnect info

On Sat, Jul 1, 2023 at 5:25 PM Cindy Lu <lulu@...hat.com> wrote:
>
> On Wed, Jun 28, 2023 at 4:04 PM Jason Wang <jasowang@...hat.com> wrote:
> >
> > On Wed, Jun 28, 2023 at 2:59 PM Cindy Lu <lulu@...hat.com> wrote:
> > >
> > > From: Your Name <you@...mple.com>
> >
> > It looks to me your git is not properly configured.
> >
> > >
> > > this struct is to save the reconnect info struct, in this
> > > struct saved the page info that alloc to save the
> > > reconnect info
> > >
> > > Signed-off-by: Cindy Lu <lulu@...hat.com>
> > > ---
> > >  drivers/vdpa/vdpa_user/vduse_dev.c | 7 +++++++
> > >  1 file changed, 7 insertions(+)
> > >
> > > diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
> > > index 26b7e29cb900..f845dc46b1db 100644
> > > --- a/drivers/vdpa/vdpa_user/vduse_dev.c
> > > +++ b/drivers/vdpa/vdpa_user/vduse_dev.c
> > > @@ -72,6 +72,12 @@ struct vduse_umem {
> > >         struct page **pages;
> > >         struct mm_struct *mm;
> > >  };
> > > +struct vdpa_reconnect_info {
> > > +       u32 index;
> > > +       phys_addr_t addr;
> > > +       unsigned long vaddr;
> > > +       phys_addr_t size;
> > > +};
> >
> > Please add comments to explain each field. And I think this should be
> > a part of uAPI?
> >
> > Thanks
> >
> Will add the new ioctl for this information

I may miss something but having this to be part of the uAPI seems more
than enough.

Or what would this new ioctl do?

Thanks

> Thanks
> Cindy
> > >
> > >  struct vduse_dev {
> > >         struct vduse_vdpa *vdev;
> > > @@ -106,6 +112,7 @@ struct vduse_dev {
> > >         u32 vq_align;
> > >         struct vduse_umem *umem;
> > >         struct mutex mem_lock;
> > > +       struct vdpa_reconnect_info reconnect_info[64];
> > >  };
> > >
> > >  struct vduse_dev_msg {
> > > --
> > > 2.34.3
> > >
> >
>