Linux: hardware: iommu；Device is ineligible for IOMMU

mzhan017

已于 2023-03-07 06:31:06 修改

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分类专栏：云平台运维文章标签： linux 运维服务器

于 2023-03-06 20:47:23 首次发布

本文链接：https://blog.youkuaiyun.com/qq_36428903/article/details/129370392

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在遇到Linux系统中设备无法使用IOMMU的错误时，可以通过BIOS设置启用IOMMU（如VT-d）。参考链接提供了解决这个问题的步骤，包括查看Intel的IOMMU相关文档，并建议联系平台供应商解决由于RMRR需求导致的设备不兼容问题。

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在BIOS打开iomm；
https://us.informatiweb.net/tutorials/it/bios/enable-iommu-or-vt-d-in-your-bios.html

Intel：iommu
https://access.redhat.com/sites/default/files/attachments/rmrr-wp1.pdf

kernel: vfio-pci 0000:04:00.0: Device is ineligible for IOMMU domain attach due to platform RMRR requirement. Contact your platform vendor.

/*
 * There are a couple cases where we need to restrict the functionality of
 * devices associated with RMRRs.  The first is when evaluating a device for
 * identity mapping because problems exist when devices are moved in and out
 * of domains and their respective RMRR information is lost.  This means that
 * a device with associated RMRRs will never be in a &#

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