Message ID | 20211001070603.307037-17-eperezma@redhat.com |
---|---|
State | New |
Headers | show |
Series | vDPA shadow virtqueue | expand |
在 2021/10/1 下午3:05, Eugenio Pérez 写道: > Signed-off-by: Eugenio Pérez <eperezma@redhat.com> > --- > hw/virtio/vhost-shadow-virtqueue.c | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c > index df7e6fa3ec..775f8d36a0 100644 > --- a/hw/virtio/vhost-shadow-virtqueue.c > +++ b/hw/virtio/vhost-shadow-virtqueue.c > @@ -173,6 +173,15 @@ static void vhost_svq_add(VhostShadowVirtqueue *svq, VirtQueueElement *elem) > svq->ring_id_maps[qemu_head] = elem; > } > > +static void vhost_svq_kick(VhostShadowVirtqueue *svq) > +{ > + /* Make sure we are reading updated device flag */ I guess this would be better: /* We need to expose available array entries before checking used * flags. */ (Borrowed from kernel codes). Thanks > + smp_mb(); > + if (!(svq->vring.used->flags & VRING_USED_F_NO_NOTIFY)) { > + event_notifier_set(&svq->kick_notifier); > + } > +} > + > /* Handle guest->device notifications */ > static void vhost_handle_guest_kick(EventNotifier *n) > { > @@ -197,7 +206,7 @@ static void vhost_handle_guest_kick(EventNotifier *n) > } > > vhost_svq_add(svq, elem); > - event_notifier_set(&svq->kick_notifier); > + vhost_svq_kick(svq); > } > > virtio_queue_set_notification(svq->vq, true);
On Wed, Oct 13, 2021 at 6:35 AM Jason Wang <jasowang@redhat.com> wrote: > > > 在 2021/10/1 下午3:05, Eugenio Pérez 写道: > > Signed-off-by: Eugenio Pérez <eperezma@redhat.com> > > --- > > hw/virtio/vhost-shadow-virtqueue.c | 11 ++++++++++- > > 1 file changed, 10 insertions(+), 1 deletion(-) > > > > diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c > > index df7e6fa3ec..775f8d36a0 100644 > > --- a/hw/virtio/vhost-shadow-virtqueue.c > > +++ b/hw/virtio/vhost-shadow-virtqueue.c > > @@ -173,6 +173,15 @@ static void vhost_svq_add(VhostShadowVirtqueue *svq, VirtQueueElement *elem) > > svq->ring_id_maps[qemu_head] = elem; > > } > > > > +static void vhost_svq_kick(VhostShadowVirtqueue *svq) > > +{ > > + /* Make sure we are reading updated device flag */ > > > I guess this would be better: > > /* We need to expose available array entries before checking used > * flags. */ > > (Borrowed from kernel codes). > > Thanks > Right, I will replace it, thanks! > > > + smp_mb(); > > + if (!(svq->vring.used->flags & VRING_USED_F_NO_NOTIFY)) { > > + event_notifier_set(&svq->kick_notifier); > > + } > > +} > > + > > /* Handle guest->device notifications */ > > static void vhost_handle_guest_kick(EventNotifier *n) > > { > > @@ -197,7 +206,7 @@ static void vhost_handle_guest_kick(EventNotifier *n) > > } > > > > vhost_svq_add(svq, elem); > > - event_notifier_set(&svq->kick_notifier); > > + vhost_svq_kick(svq); > > } > > > > virtio_queue_set_notification(svq->vq, true); >
diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c index df7e6fa3ec..775f8d36a0 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -173,6 +173,15 @@ static void vhost_svq_add(VhostShadowVirtqueue *svq, VirtQueueElement *elem) svq->ring_id_maps[qemu_head] = elem; } +static void vhost_svq_kick(VhostShadowVirtqueue *svq) +{ + /* Make sure we are reading updated device flag */ + smp_mb(); + if (!(svq->vring.used->flags & VRING_USED_F_NO_NOTIFY)) { + event_notifier_set(&svq->kick_notifier); + } +} + /* Handle guest->device notifications */ static void vhost_handle_guest_kick(EventNotifier *n) { @@ -197,7 +206,7 @@ static void vhost_handle_guest_kick(EventNotifier *n) } vhost_svq_add(svq, elem); - event_notifier_set(&svq->kick_notifier); + vhost_svq_kick(svq); } virtio_queue_set_notification(svq->vq, true);
Signed-off-by: Eugenio Pérez <eperezma@redhat.com> --- hw/virtio/vhost-shadow-virtqueue.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)