:orphan:

.. title:: CONFIG_X86_KPTI

.. kconfig:: CONFIG_X86_KPTI

CONFIG_X86_KPTI
###############

*Enable kernel page table isolation*

Type: ``bool``

Help
====

.. code-block:: none

    Implements kernel page table isolation to mitigate Meltdown exploits
    to read Kernel RAM. Incurs a significant performance cost for
    user thread interrupts and system calls, and significant footprint
    increase for additional page tables and trampoline stacks.

Direct dependencies
===================

\ :kconfig:`USERSPACE <CONFIG_USERSPACE>` && !\ :kconfig:`X86_NO_MELTDOWN <CONFIG_X86_NO_MELTDOWN>` && \ :kconfig:`X86 <CONFIG_X86>`

*(Includes any dependencies from ifs and menus.)*

Default
=======

- y

Kconfig definition
==================



At ``<Zephyr Architecture>/x86/Kconfig:471``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:39`` → ``<Zephyr Architecture>/Kconfig:12``

Menu path: (Top) → X86 Architecture Options

.. code-block:: kconfig

    config X86_KPTI
    	bool "Enable kernel page table isolation"
    	default y
    	depends on USERSPACE && !X86_NO_MELTDOWN && X86
    	help
    	  Implements kernel page table isolation to mitigate Meltdown exploits
    	  to read Kernel RAM. Incurs a significant performance cost for
    	  user thread interrupts and system calls, and significant footprint
    	  increase for additional page tables and trampoline stacks.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*