Signed-off-by: Asias He <asias.hejun@xxxxxxxxx>
---
tools/kvm/include/kvm/virtqueue.h | 42 +++++++++++++++++++++++++++++++++++++
1 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/tools/kvm/include/kvm/virtqueue.h b/tools/kvm/include/kvm/virtqueue.h
index 83f5293..de360ae 100644
--- a/tools/kvm/include/kvm/virtqueue.h
+++ b/tools/kvm/include/kvm/virtqueue.h
@@ -4,6 +4,9 @@
#include <linux/virtio_ring.h>
#include <stdint.h>
+#include <sys/uio.h>
+
+#include "kvm/kvm.h"
struct virt_queue {
struct vring vring;
@@ -28,4 +31,43 @@ static inline struct vring_used_elem *virt_queue__get_used_elem(struct virt_queu
return &queue->vring.used->ring[queue->vring.used->idx++ % queue->vring.num];
}
+static inline struct vring_used_elem *virt_queue__set_used_elem(struct virt_queue *queue, uint32_t head, uint32_t len)
+{
+ struct vring_used_elem *used_elem;
+ used_elem = &queue->vring.used->ring[queue->vring.used->idx++ % queue->vring.num];
+ used_elem->id = head;
+ used_elem->len = len;
+ return used_elem;
+}
+
+static inline bool virt_queue__available(struct virt_queue *vq)
+{
+ return vq->vring.avail->idx != vq->last_avail_idx;
+}
+
+static inline uint16_t virt_queue__get_iov(struct virt_queue *queue, struct iovec iov[], uint16_t *out, uint16_t *in, struct kvm *kvm)
+{
+ struct vring_desc *desc;
+ uint16_t head, idx;
+
+ idx = head = virt_queue__pop(queue);
+ *out = *in = 0;
+
+ do {
+ desc = virt_queue__get_desc(queue, idx);
+ iov[*out + *in].iov_base = guest_flat_to_host(kvm, desc->addr);
+ iov[*out + *in].iov_len = desc->len;
+ if (desc->flags & VRING_DESC_F_WRITE)
+ (*in)++;
+ else
+ (*out)++;
+ if (desc->flags & VRING_DESC_F_NEXT)
+ idx = desc->next;
+ else
+ break;
+ } while (1);
+
+ return head;
+}
+
#endif /* KVM__VIRTQUEUE_H */
--
1.7.4.1
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