On Tue, Aug 3, 2021 at 4:10 PM Jason Wang <jasowang@xxxxxxxxxx> wrote:
>
>
> 在 2021/7/29 下午3:34, Xie Yongji 写道:
> > Re-read the device status to ensure it's set to zero during
> > resetting. Otherwise, fail the vhost_vdpa_set_status() after timeout.
> >
> > Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
> > ---
> > drivers/vhost/vdpa.c | 11 ++++++++++-
> > 1 file changed, 10 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> > index b07aa161f7ad..dd05c1e1133c 100644
> > --- a/drivers/vhost/vdpa.c
> > +++ b/drivers/vhost/vdpa.c
> > @@ -157,7 +157,7 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
> > struct vdpa_device *vdpa = v->vdpa;
> > const struct vdpa_config_ops *ops = vdpa->config;
> > u8 status, status_old;
> > - int nvqs = v->nvqs;
> > + int timeout = 0, nvqs = v->nvqs;
> > u16 i;
> >
> > if (copy_from_user(&status, statusp, sizeof(status)))
> > @@ -173,6 +173,15 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
> > return -EINVAL;
> >
> > ops->set_status(vdpa, status);
> > + if (status == 0) {
> > + while (ops->get_status(vdpa)) {
> > + timeout += 20;
> > + if (timeout > VDPA_RESET_TIMEOUT_MS)
> > + return -EIO;
> > +
> > + msleep(20);
> > + }
>
>
> Spec has introduced the reset a one of the basic facility. And consider
> we differ reset here.
>
> This makes me think if it's better to introduce a dedicated vdpa ops for
> reset?
>
Do you mean replace the ops.set_status(vdev, 0) with the ops.reset()?
Then we can remove the timeout processing which is device specific
stuff.
Thanks,
Yongji
