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 arch/x86/Kconfig:471
Included via Kconfig:8 → Kconfig.zephyr:39 → arch/Kconfig:12
Menu path: (Top) → X86 Architecture Options
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.)