# virtio

[OS Dev](https://wiki.osdev.org/)提供了[Virtio](https://wiki.osdev.org/Virtio)定义：

VirtIO是允许虚拟机访问简单的虚拟设备的标准接口，如块设备，网卡和控制台。在guest VM中通过VirtIO访问设备比传统的"模拟"设备性能要好，因为VirtIO设备这要求最小的设置和配置发送和接收数据，此时host主机处理主要的物理硬件的设置和维护。

VirtIO开发主要可参考如下文档：

* [VirtIO specifications](http://docs.oasis-open.org/virtio/virtio/v1.0/virtio-v1.0.html)
* [VirtIO Driver Example](http://www.dumaisnet.ca/index.php?article=aca38a9a2b065b24dfa1dee728062a12)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://huataihuang.gitbook.io/cloud-atlas-draft/virtual/kvm/virtio.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.