On Wed, Sep 15, 2021 at 03:52:32PM +0800, Wu Zongyong wrote:
> On Wed, Sep 15, 2021 at 03:26:41AM -0400, Michael S. Tsirkin wrote:
> > On Wed, Sep 15, 2021 at 02:39:32PM +0800, Wu Zongyong wrote:
> > > Currently we unset vq irq after freeing irq and that will result in
> > > error messages:
> > >
> > > pi_update_irte: failed to update PI IRTE
> > > irq bypass consumer (token 000000005a07a12b) unregistration fails: -22
> > >
> > > This patch solves this.
> > >
> > > Signed-off-by: Wu Zongyong <wuzongyong@xxxxxxxxxxxxxxxxx>
> > > ---
> > > drivers/vhost/vdpa.c | 8 ++++----
> > > 1 file changed, 4 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> > > index f41d081777f5..15bae2290bf9 100644
> > > --- a/drivers/vhost/vdpa.c
> > > +++ b/drivers/vhost/vdpa.c
> > > @@ -173,6 +173,10 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
> > > if (status != 0 && (ops->get_status(vdpa) & ~status) != 0)
> > > return -EINVAL;
> > >
> > > + if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))
> > > + for (i = 0; i < nvqs; i++)
> > > + vhost_vdpa_unsetup_vq_irq(v, i);
> > > +
> >
> > If we do this before reset like this then the device might assert the
> > irq, might it not?
> >
> This would not be a problem.
> AFAIK, vhost_vdpa_unsetup_vq_irq just disables the irq offloading, and the irq
> will be handled if there comes an irq.
Oh, right. ACK.
> > > if (status == 0) {
> > > ret = ops->reset(vdpa);
> > > if (ret)
> >
> >
> > > @@ -184,10 +188,6 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
> > > for (i = 0; i < nvqs; i++)
> > > vhost_vdpa_setup_vq_irq(v, i);
> > >
> > > - if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))
> > > - for (i = 0; i < nvqs; i++)
> > > - vhost_vdpa_unsetup_vq_irq(v, i);
> > > -
> > > return 0;
> >
> >
> >
> > > }
> > >
> > > --
> > > 2.31.1
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