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OSDOCS-20054: Remove invalid amd_iommu=on kernel argument #118945

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OSDOCS-20054: Remove invalid amd_iommu=on kernel argument #118945

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11 changes: 9 additions & 2 deletions modules/virt-adding-kernel-arguments-enable-iommu.adoc
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Expand Up @@ -44,8 +44,15 @@ spec:
# ...
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** `metadata.labels.machineconfiguration.openshift.io/role` specifies that the new kernel argument is applied only to worker nodes.
** `metadata.name` specifies the ranking of this kernel argument (100) among the machine configs and its purpose. If you have an AMD CPU, specify the kernel argument as `amd_iommu=on`.
** `spec.kernelArguments` specifies the kernel argument as `intel_iommu` for an Intel CPU.
** `metadata.name` specifies the ranking of this kernel argument (100) among the machine configs and its purpose.
** `spec.kernelArguments` specifies the kernel argument as `intel_iommu=on` for an Intel CPU.
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[NOTE]
====
Do not specify `amd_iommu=on`. That value is not valid for the AMD IOMMU driver. The kernel ignores it and logs `AMD-Vi: Unknown option - 'on'`.
On AMD CPUs, IOMMU is enabled by default when AMD-Vi is enabled in the BIOS. You do not need an `amd_iommu=` kernel argument unless you require a supported option such as `off` or `force_enable`.
For PCI passthrough, you can optionally add `iommu=pt` to reduce DMA overhead.
====

. Create the new `MachineConfig` object:
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