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kvm tools: Add helper functions for virtqueue code

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Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Asias He
2015-06-01 16:39:41 +01:00
committed by Will Deacon
parent f05bbe8ddf
commit 3ee180ed94
1 changed files with 42 additions and 0 deletions
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include/kvm/virtqueue.h
+42
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@@ -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 */