static inline uint16_t vring_avail_idx(VirtQueue *vq) { VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches); hwaddr pa = offsetof(VRingAvail, idx); vq->shadow_avail_idx = virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa); return vq->shadow_avail_idx; }