PowerPC 405-S的缓存全虚拟化

A. Carvalho, Francisco Afonsox, P. Cardoso, J. Cabral, Mongkol Ekpanyapongy, Sergio Montenegroz, A. Tavares
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引用次数: 2

摘要

随着实时嵌入式系统变得异常复杂,基于管理程序的体系结构被越来越多地使用。基于管理程序的体系结构可以支持这种级别的复杂性,同时提供实时性能,同时减少此类系统的大小、成本和上市时间。现代处理器提供了可以大大提高性能的缓存设施。类似地,在基于管理程序的体系结构中,通过为虚拟机(VM)提供这样的设施,可以显著提高它们的性能,正如我们在本文中总结的那样。本文介绍了一种完全虚拟化IBM PowerPC 405-S缓存设施的方法。据我们所知,这是第一次公开描述缓存虚拟化。在VM的缓存相关配置和处理器配置之间进行了仔细的映射,同时模拟了5个与缓存相关的特权指令。尽管已经检测到一些问题,但为所有问题提供了一个简单的解决方案。结果表明,缓存虚拟化以最小的虚拟化开销工作。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cache full-virtualization for the PowerPC 405-S
As real-time embedded systems become overwhelmingly complex, hypervisor-based architectures are increasingly being used. Hypervisor-based architectures can support such level of complexity and, at the same time, provide real-time performance while reducing the size, cost and time-to-market of such systems. Modern processors provide cache facilities which can increase their performance substantially. Similarly, in hypervisor-based architectures, by providing virtual machines (VM) with such facilities a significant improvement in their performance can be obtained as we conclude in this work. This article presents a methodology to fully virtualize the cache facilities of the IBM PowerPC 405-S. To the best of our knowledge, this is the first time cache virtualization is openly described. A careful mapping between a VM's cache-related configuration and the processor's configuration is done, accompanied by the emulation of 5 cache-related privileged instructions. Even though some issues have been detected, a simple solution is provided for all of them. The results show that cache virtualization works with minimal virtualization overhead.
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