CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON: Enable Intel IOMMU scalable mode by default

General informations

The Linux kernel configuration item CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON has multiple definitions:

Enable Intel IOMMU scalable mode by default found in drivers/iommu/intel/Kconfig

The configuration item CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON:

• prompt: Enable Intel IOMMU scalable mode by default
• type: bool
• depends on: (none)
• defined in drivers/iommu/intel/Kconfig
• found in Linux kernels: 5.9–5.19, 6.0–6.13

Help text

Selecting this option will enable by default the scalable mode if hardware presents the capability. The scalable mode is defined in VT-d 3.0. The scalable mode capability could be checked by reading /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option is not selected, scalable mode support could also be enabled by passing intel_iommu=sm_on to the kernel. If not sure, please use the default value.

Enable Intel IOMMU scalable mode by default found in drivers/iommu/Kconfig

The configuration item CONFIG_INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON:

• prompt: Enable Intel IOMMU scalable mode by default
• type: bool
• depends on: CONFIG_INTEL_IOMMU
• defined in drivers/iommu/Kconfig
• found in Linux kernels: 5.6–5.8

Help text

Selecting this option will enable by default the scalable mode if hardware presents the capability. The scalable mode is defined in VT-d 3.0. The scalable mode capability could be checked by reading /sys/devices/virtual/iommu/dmar*/intel-iommu/ecap. If this option is not selected, scalable mode support could also be enabled by passing intel_iommu=sm_on to the kernel. If not sure, please use the default value.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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