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9.4. 系统设备
系统设备对虚拟机是必须的，它们不能从虚拟机上删除。每个附加到虚拟机上的系统设备都会占用一个 PCI 插槽。默认的系统设备是：
- 主桥（host bridge）
- ISA 桥和 USB 桥（USB 桥和 ISA 桥是相同的设备）
- 图形卡（使用 Cirrus 或 qxl 驱动）
- 内存气球设备（memory balloon device）
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