static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)

{

    VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches);

    VirtIODevice *vdev = vq->vdev;

    hwaddr pa = offsetof(VRingUsed, flags);

    uint16_t flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa);



    virtio_stw_phys_cached(vdev, &caches->used, pa, flags | mask);

    address_space_cache_invalidate(&caches->used, pa, sizeof(flags));

}
