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

["Boeuf, Sebastien" <sebastien.boeuf@intel.com>]

On Wed, 2022-10-19 at 11:31 +0200, Eugenio Perez Martin wrote:
> On Tue, Oct 18, 2022 at 10:38 AM <sebastien.boeuf@intel.com> wrote:
> > 
> > From: Sebastien Boeuf <sebastien.boeuf@intel.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@intel.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
> > 
> > -------------------------------------------------------------------
> > --
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> > Registered headquarters: "Les Montalets"- 2, rue de Paris,
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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
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