在 2021/10/1 下午3:06, Eugenio Pérez 写道:
Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
Commit log please. Thanks
--- hw/virtio/vhost-shadow-virtqueue.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c index 775f8d36a0..2fd0bab75d 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -60,6 +60,9 @@ typedef struct VhostShadowVirtqueue {/* Next head to consume from device */uint16_t used_idx; + + /* Cache for the exposed notification flag */ + bool notification; } VhostShadowVirtqueue;/* If the device is using some of these, SVQ cannot communicate */@@ -105,6 +108,24 @@ bool vhost_svq_valid_device_features(uint64_t *dev_features) return r; }+static void vhost_svq_set_notification(VhostShadowVirtqueue *svq, bool enable)+{ + uint16_t notification_flag; + + if (svq->notification == enable) { + return; + } + + notification_flag = cpu_to_le16(VRING_AVAIL_F_NO_INTERRUPT); + + svq->notification = enable; + if (enable) { + svq->vring.avail->flags &= ~notification_flag; + } else { + svq->vring.avail->flags |= notification_flag; + } +} + static void vhost_vring_write_descs(VhostShadowVirtqueue *svq, const struct iovec *iovec, size_t num, bool more_descs, bool write) @@ -273,7 +294,7 @@ static void vhost_svq_handle_call_no_test(EventNotifier *n) do { unsigned i = 0;- /* TODO: Use VRING_AVAIL_F_NO_INTERRUPT */+ vhost_svq_set_notification(svq, false); while (true) { g_autofree VirtQueueElement *elem = vhost_svq_get_buf(svq); if (!elem) { @@ -286,6 +307,7 @@ static void vhost_svq_handle_call_no_test(EventNotifier *n)virtqueue_flush(vq, i);event_notifier_set(&svq->guest_call_notifier); + vhost_svq_set_notification(svq, true); } while (vhost_svq_more_used(svq)); }
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