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CONFIG_X86_KPTI
¶
Enable kernel page table isolation
Type: bool
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.
Direct dependencies¶
USERSPACE
&& !X86_NO_MELTDOWN
&& X86
(Includes any dependencies from ifs and menus.)
Default¶
y
Kconfig definition¶
At <Zephyr>/arch/x86/Kconfig:316
Included via <Zephyr>/Kconfig:8
→ <Zephyr>/Kconfig.zephyr:29
→ <Zephyr>/arch/Kconfig:12
Menu path: (Top) → X86 Architecture Options
config X86_KPTI bool "Enable kernel page table isolation" default y depends onUSERSPACE
&& !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.)