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IOMMU ACPI路径下MSI中断/线中断选择问题 #342

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@gougou1104

【OS版本】openEuler-24.03-SP3
【内核版本】rvck-6.6
【硬件平台】蓝芯LX500服务器
【问题描述】当IOMMU IGS寄存器里MSI和线中断都支持的情况下,OS对于这种情况的处理policy是
1、Device Tree Path:如果设备数配置的是线中断,则使用线中断模式
2、ACPI Path:会优先使用MSI中断,即使ACPI表里加入了线中断,也会用MSI中断。
针对这个行为,阿里向kernel.org社区提交一个patch,目前还没合并,但服务器上测试有效
https://lkml.org/lkml/2026/5/19/1406

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