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97 lines
3.1 KiB
Plaintext
97 lines
3.1 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * virt/virtual_machines/advanced_vm_management/configuring-pci-passthrough.adoc
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// * virt/virtual_machines/advanced_vm_management/virt-configuring-virtual-gpus.adoc
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:_mod-docs-content-type: PROCEDURE
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[id="virt-adding-kernel-arguments-enable-IOMMU_{context}"]
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= Adding kernel arguments to enable the IOMMU driver
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[role="_abstract"]
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To enable the IOMMU driver in the kernel, create the `MachineConfig` object and add the kernel arguments.
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.Prerequisites
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* You have cluster administrator permissions.
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* Your CPU hardware is Intel or AMD.
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* You enabled Intel Virtualization Technology for Directed I/O extensions or AMD IOMMU in the BIOS.
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* You have installed the {oc-first}.
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.Procedure
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. Create a `MachineConfig` object that identifies the kernel argument. The following example shows a kernel argument for an Intel CPU.
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+
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[source,yaml]
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----
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apiVersion: machineconfiguration.openshift.io/v1
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kind: MachineConfig
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metadata:
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labels:
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machineconfiguration.openshift.io/role: worker
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name: 100-worker-iommu
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spec:
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config:
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ignition:
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version: 3.2.0
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kernelArguments:
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- intel_iommu=on
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# ...
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----
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where:
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<apiversion>:: Applies the new kernel argument only to worker nodes.
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<name>:: Indicates 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`.
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<intel_iommu=o>:: Identifies the kernel argument as `intel_iommu` for an Intel CPU.
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. Create the new `MachineConfig` object:
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+
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[source,terminal]
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----
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$ oc create -f 100-worker-kernel-arg-iommu.yaml
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----
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.Verification
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. Verify that the new `MachineConfig` object was added by entering the following command and observing the output:
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[source,terminal]
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----
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$ oc get MachineConfig
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----
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Example output:
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[source,terminal]
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----
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NAME IGNITIONVERSION AGE
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00-master 3.5.0 164m
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00-worker 3.5.0 164m
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01-master-container-runtime 3.5.0 164m
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01-master-kubelet 3.5.0 164m
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01-worker-container-runtime 3.5.0 164m
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01-worker-kubelet 3.5.0 164m
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100-master-chrony-configuration 3.5.0 169m
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100-master-set-core-user-password 3.5.0 169m
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100-worker-chrony-configuration 3.5.0 169m
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100-worker-iommu 3.5.0 14s
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----
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. Verify that IOMMU is enabled at the operating system (OS) level by entering the following command:
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[source,terminal]
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----
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$ dmesg | grep -i iommu
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----
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* If IOMMU is enabled, output is displayed as shown in the following example:
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Example output:
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[source,terminal]
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----
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Intel: [ 0.000000] DMAR: Intel(R) IOMMU Driver
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AMD: [ 0.000000] AMD-Vi: IOMMU Initialized
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----
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