Help¶

This option will enable the Extended Indirect Branch Restricted Speculation ‘always on’ feature. This mitigates Indirect Branch Control vulnerabilities (aka Spectre V2).

Direct dependencies¶

USERSPACE && X86

(Includes any dependencies from ifs and menus.)

Default¶

y if !X86_NO_SPECTRE_V2

Kconfig definition¶

At <Zephyr>/arch/x86/Kconfig:296

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:29 → <Zephyr>/arch/Kconfig:12

Menu path: (Top) → X86 Architecture Options

config ENABLE_EXTENDED_IBRS
    bool "Enable Extended IBRS"
    default y if !X86_NO_SPECTRE_V2
    depends on USERSPACE && X86
    help
      This option will enable the Extended Indirect Branch Restricted
      Speculation 'always on' feature. This mitigates Indirect Branch
      Control vulnerabilities (aka Spectre V2).

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)