/* The last_avail_idx field is an index to ->ring of struct vring_avail.
It's where we assume the next request index is at. */
u16 last_avail_idx;
+ u16 last_used_signalled;
};
static inline u16 virt_queue__pop(struct virt_queue *queue)
return guest_flat_to_host(kvm, (unsigned long)pfn << VIRTIO_PCI_QUEUE_ADDR_SHIFT);
}
-static inline int virtio_queue__should_signal(struct virt_queue *vq)
-{
- return vring_used_event(&vq->vring) <= vq->vring.used->idx;
-}
struct vring_used_elem *virt_queue__set_used_elem(struct virt_queue *queue, u32 head, u32 len);
+bool virtio_queue__should_signal(struct virt_queue *vq);
u16 virt_queue__get_iov(struct virt_queue *queue, struct iovec iov[], u16 *out, u16 *in, struct kvm *kvm);
u16 virt_queue__get_inout_iov(struct kvm *kvm, struct virt_queue *queue,
struct iovec in_iov[], struct iovec out_iov[],
return VIRTIO_PCI_O_CONFIG;
}
+
+bool virtio_queue__should_signal(struct virt_queue *vq)
+{
+ u16 old_idx, new_idx, event_idx;
+
+ old_idx = vq->last_used_signalled;
+ new_idx = vq->vring.used->idx;
+ event_idx = vring_used_event(&vq->vring);
+
+ if (vring_need_event(event_idx, new_idx, old_idx)) {
+ vq->last_used_signalled = new_idx;
+ return true;
+ }
+
+ return false;
+}