[PATCH 2/5] tools/kvm/virtio: Add new iov helper

["Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>]

This add the in and out iovec to seperate array

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
---
 tools/kvm/include/kvm/virtio.h |    3 +++
 tools/kvm/virtio/core.c        |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/tools/kvm/include/kvm/virtio.h b/tools/kvm/include/kvm/virtio.h
index 66e6fdb..b962705 100644
--- a/tools/kvm/include/kvm/virtio.h
+++ b/tools/kvm/include/kvm/virtio.h
@@ -50,6 +50,9 @@ static inline void *guest_pfn_to_host(struct kvm *kvm, u32 pfn)
 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);
+u16 virt_queue__get_inout_iov(struct kvm *kvm, struct virt_queue *queue,
+			      struct iovec in_iov[], struct iovec out_iov[],
+			      u16 *in, u16 *out);
 
 void virt_queue__trigger_irq(struct virt_queue *vq, int irq, u8 *isr, struct kvm *kvm);
 
diff --git a/tools/kvm/virtio/core.c b/tools/kvm/virtio/core.c
index 2b3503d..d28cfc6 100644
--- a/tools/kvm/virtio/core.c
+++ b/tools/kvm/virtio/core.c
@@ -58,6 +58,38 @@ u16 virt_queue__get_iov(struct virt_queue *queue, struct iovec iov[], u16 *out,
 	return head;
 }
 
+/* in and out are relative to guest */
+u16 virt_queue__get_inout_iov(struct kvm *kvm, struct virt_queue *queue,
+			      struct iovec in_iov[], struct iovec out_iov[],
+			      u16 *in, u16 *out)
+{
+	u16 head, idx;
+	struct vring_desc *desc;
+
+	idx = head = virt_queue__pop(queue);
+	*out = *in = 0;
+	do {
+		desc = virt_queue__get_desc(queue, idx);
+		if (desc->flags & VRING_DESC_F_WRITE) {
+			in_iov[*in].iov_base = guest_flat_to_host(kvm,
+								  desc->addr);
+			in_iov[*in].iov_len = desc->len;
+			(*in)++;
+		} else {
+			out_iov[*out].iov_base = guest_flat_to_host(kvm,
+								    desc->addr);
+			out_iov[*out].iov_len = desc->len;
+			(*out)++;
+		}
+		if (desc->flags & VRING_DESC_F_NEXT)
+			idx = desc->next;
+		else
+			break;
+	} while (1);
+	return head;
+}
+
+
 void virt_queue__trigger_irq(struct virt_queue *vq, int irq, u8 *isr, struct kvm *kvm)
 {
 	if (vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)
-- 
1.7.4.1

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