linux-kernel - Re: [PATCH v4 4/4] vdpa_sim: Implement resume vdpa op

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Message-ID: <c1849397292bd036132c15836d0ed8e8e4d5b27c.camel@intel.com>
Date:   Wed, 19 Oct 2022 09:37:37 +0000
From:   "Boeuf, Sebastien" <sebastien.boeuf@...el.com>
To:     "eperezma@...hat.com" <eperezma@...hat.com>
CC:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "mst@...hat.com" <mst@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] vdpa_sim: Implement resume vdpa op

On Wed, 2022-10-19 at 11:31 +0200, Eugenio Perez Martin wrote:
> On Tue, Oct 18, 2022 at 10:38 AM <sebastien.boeuf@...el.com> wrote:
> > 
> > From: Sebastien Boeuf <sebastien.boeuf@...el.com>
> > 
> > Implement resume operation for vdpa_sim devices, so vhost-vdpa will
> > offer that backend feature and userspace can effectively resume the
> > device.
> > 
> > Signed-off-by: Sebastien Boeuf <sebastien.boeuf@...el.com>
> > ---
> >  drivers/vdpa/vdpa_sim/vdpa_sim.c | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> > 
> > diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > index b071f0d842fb..05e3802fb746 100644
> > --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> > @@ -527,6 +527,18 @@ static int vdpasim_suspend(struct vdpa_device
> > *vdpa)
> >         return 0;
> >  }
> > 
> > +static int vdpasim_resume(struct vdpa_device *vdpa)
> > +{
> > +       struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
> > +       int i;
> > +
> > +       spin_lock(&vdpasim->lock);
> > +       vdpasim->running = true;
> > +       spin_unlock(&vdpasim->lock);
> > +
> > +       return 0;
> > +}
> > +
> 
> To never kick at resuming is not the right thing to do :).
> 
> Maybe to store in the vdpasim_virtqueue if it was kicked during the
> suspend window?
> 
> Thanks!

Let's hear what Michael think about this approach?
I just want to make sure we're all on the same page before I send the
next version :)

Thanks,
Sebastien

> 
> 
> 
> >  static size_t vdpasim_get_config_size(struct vdpa_device *vdpa)
> >  {
> >         struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
> > @@ -717,6 +729,7 @@ static const struct vdpa_config_ops
> > vdpasim_config_ops = {
> >         .set_status             = vdpasim_set_status,
> >         .reset                  = vdpasim_reset,
> >         .suspend                = vdpasim_suspend,
> > +       .resume                 = vdpasim_resume,
> >         .get_config_size        = vdpasim_get_config_size,
> >         .get_config             = vdpasim_get_config,
> >         .set_config             = vdpasim_set_config,
> > @@ -750,6 +763,7 @@ static const struct vdpa_config_ops
> > vdpasim_batch_config_ops = {
> >         .set_status             = vdpasim_set_status,
> >         .reset                  = vdpasim_reset,
> >         .suspend                = vdpasim_suspend,
> > +       .resume                 = vdpasim_resume,
> >         .get_config_size        = vdpasim_get_config_size,
> >         .get_config             = vdpasim_get_config,
> >         .set_config             = vdpasim_set_config,
> > --
> > 2.34.1
> > 
> > -------------------------------------------------------------------
> > --
> > Intel Corporation SAS (French simplified joint stock company)
> > Registered headquarters: "Les Montalets"- 2, rue de Paris,
> > 92196 Meudon Cedex, France
> > Registration Number:  302 456 199 R.C.S. NANTERRE
> > Capital: 5 208 026.16 Euros
> > 
> > This e-mail and any attachments may contain confidential material
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> 

---------------------------------------------------------------------
Intel Corporation SAS (French simplified joint stock company)
Registered headquarters: "Les Montalets"- 2, rue de Paris, 
92196 Meudon Cedex, France
Registration Number:  302 456 199 R.C.S. NANTERRE
Capital: 5 208 026.16 Euros

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.