Intel IOMMU on Linux kernel

最新推荐文章于 2025-05-26 00:10:48 发布

hotsolaris

最新推荐文章于 2025-05-26 00:10:48 发布

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文章标签： linux structure access domain translation generation

本文链接：https://blog.youkuaiyun.com/hotsolaris/article/details/1755848

本文介绍了Linux内核中Intel IOMMU的支持情况，包括DMAR（DMA重映射）、DRHD（DMA引擎报告结构）、RMRR（预留内存区域报告结构）等关键概念。内容涵盖了IO虚拟地址（IOVA）的生成、图形设备问题的处理以及故障报告机制。通过ACPI枚举平台上的DMA引擎和设备范围，解释了如何为不同设备设置DMA翻译。

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Linux IOMMU Support
===================

The architecture spec can be obtained from the below location.

http://www.intel.com/technology/virtualization/

This guide gives a quick cheat sheet for some basic understanding.

Some Keywords

DMAR - DMA remapping
DRHD - DMA Engine Reporting Structure
RMRR - Reserved memory Region Reporting Structure
ZLR - Zero length reads from PCI devices
IOVA - IO Virtual address.

Basic stuff
-----------

ACPI enumerates and lists the different DMA engines in the platform, and
device scope relationships between PCI devices and which DMA engine controls
them.

What is RMRR?
-------------

There are some devices the BIOS controls, for e.g USB devices to perform
PS2 emulation. The regions