Method UsedPhys

src/device/virtio/virt_queue/split.hpp:578–580

* @brief 获取 Used Ring 的物理地址 * @see virtio-v1.2#2.7.8 */

   * @see virtio-v1.2#2.7.8
   */
  [[nodiscard]] auto UsedPhys() const -> uint64_t {
    return phys_base_ + used_offset_;
  }

  /**
   * @brief 获取队列大小