On Thu, Nov 17, 2011 at 3:04 PM, Sasha Levin <levinsasha928@xxxxxxxxx> wrote:
> Support the event index feature in the virtio spec.
>
> The results are less notifications between the guest and host, and in
> result faster operation of the virt queues.
>
> Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
What's this patch doing? There's no mention of VIRTIO_RING_F_EVENT_IDX
in the diff...
> ---
> tools/kvm/include/kvm/virtio.h | 7 +++++++
> 1 files changed, 7 insertions(+), 0 deletions(-)
>
> diff --git a/tools/kvm/include/kvm/virtio.h b/tools/kvm/include/kvm/virtio.h
> index c6c380d..cd24285 100644
> --- a/tools/kvm/include/kvm/virtio.h
> +++ b/tools/kvm/include/kvm/virtio.h
> @@ -38,6 +38,8 @@ static inline bool virt_queue__available(struct virt_queue *vq)
> {
> if (!vq->vring.avail)
> return 0;
> +
> + vring_avail_event(&vq->vring) = vq->last_avail_idx;
> return vq->vring.avail->idx != vq->last_avail_idx;
> }
>
> @@ -51,6 +53,11 @@ static inline void *guest_pfn_to_host(struct kvm *kvm, u32 pfn)
> 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);
>
> u16 virt_queue__get_iov(struct virt_queue *queue, struct iovec iov[], u16 *out, u16 *in, struct kvm *kvm);
> --
> 1.7.8.rc1
>
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