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SubjectRe: [PATCH v6 1/4] vdpa: Add suspend operation
On Fri, Jul 8, 2022 at 7:31 PM Eugenio Perez Martin <eperezma@redhat.com> wrote:
>
> On Wed, Jun 29, 2022 at 6:10 AM Jason Wang <jasowang@redhat.com> wrote:
> >
> > On Fri, Jun 24, 2022 at 12:07 AM Eugenio Pérez <eperezma@redhat.com> wrote:
> > >
> > > This operation is optional: It it's not implemented, backend feature bit
> > > will not be exposed.
> >
> > A question, do we allow suspending a device without DRIVER_OK?
> >
>
> That should be invalid. In particular, vdpa_sim will resume in that
> case, but I guess it would depend on the device.

Yes, and that will match our virtio spec patch (STOP bit).

>
> Do you think it should be controlled in the vdpa frontend code?

The vdpa bus should validate this at least.

Thanks

>
> Thanks!
>
> > Thanks
> >
> > >
> > > Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
> > > ---
> > > include/linux/vdpa.h | 4 ++++
> > > 1 file changed, 4 insertions(+)
> > >
> > > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> > > index 7b4a13d3bd91..d282f464d2f1 100644
> > > --- a/include/linux/vdpa.h
> > > +++ b/include/linux/vdpa.h
> > > @@ -218,6 +218,9 @@ struct vdpa_map_file {
> > > * @reset: Reset device
> > > * @vdev: vdpa device
> > > * Returns integer: success (0) or error (< 0)
> > > + * @suspend: Suspend or resume the device (optional)
> > > + * @vdev: vdpa device
> > > + * Returns integer: success (0) or error (< 0)
> > > * @get_config_size: Get the size of the configuration space includes
> > > * fields that are conditional on feature bits.
> > > * @vdev: vdpa device
> > > @@ -319,6 +322,7 @@ struct vdpa_config_ops {
> > > u8 (*get_status)(struct vdpa_device *vdev);
> > > void (*set_status)(struct vdpa_device *vdev, u8 status);
> > > int (*reset)(struct vdpa_device *vdev);
> > > + int (*suspend)(struct vdpa_device *vdev);
> > > size_t (*get_config_size)(struct vdpa_device *vdev);
> > > void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> > > void *buf, unsigned int len);
> > > --
> > > 2.31.1
> > >
> >
>

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