CONFIG_PFAULT: Pseudo page fault support

General informations

The Linux kernel configuration item CONFIG_PFAULT has multiple definitions:

Pseudo page fault support found in arch/s390/Kconfig

The configuration item CONFIG_PFAULT:

• prompt: Pseudo page fault support
• type: bool
• depends on: (none)
• defined in arch/s390/Kconfig
• found in Linux kernels: 2.5.45–2.5.75, 2.6.0–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Select this option, if you want to use PFAULT pseudo page fault handling under VM. If running native or in LPAR, this option has no effect. If your VM does not support PFAULT, PAGEEX pseudo page fault handling will be used. Note that VM 4.2 supports PFAULT but has a bug in its implementation that causes some problems. Everybody who wants to run Linux under VM != VM4.2 should select this option.

Handle protection faults found in arch/xtensa/Kconfig

The configuration item CONFIG_PFAULT:

• prompt: Handle protection faults
• type: bool
• depends on: CONFIG_EXPERT && ! CONFIG_MMU
• defined in arch/xtensa/Kconfig
• found in Linux kernels: 5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Handle protection faults. MMU configurations must enable it. noMMU configurations may disable it if used memory map never generates protection faults or faults are always fatal.

If unsure, say Y.

Pseudo page fault support found in arch/s390x/Kconfig

The configuration item CONFIG_PFAULT:

• prompt: Pseudo page fault support
• type: bool
• depends on: (none)
• defined in arch/s390x/Kconfig
• found in Linux kernels: 2.5.45–2.5.67

Help text

Select this option, if you want to use PFAULT pseudo page fault handling under VM. If running native or in LPAR, this option has no effect. If your VM does not support PFAULT, PAGEEX pseudo page fault handling will be used. Note that VM 4.2 supports PFAULT but has a bug in its implementation that causes some problems. Everybody who wants to run Linux under VM != VM4.2 should select this option.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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