From: Jeremy Linton jeremy.linton@arm.com

commit de19055564c8f8f9d366f8db3395836da0b2176c upstream

For a while Arm64 has been capable of force enabling or disabling the kpti mitigations. Lets make sure the documentation reflects that.

Signed-off-by: Jeremy Linton jeremy.linton@arm.com Reviewed-by: Andre Przywara andre.przywara@arm.com Signed-off-by: Jonathan Corbet corbet@lwn.net [florian: patch the correct file] Signed-off-by: Florian Fainelli f.fainelli@gmail.com --- Documentation/kernel-parameters.txt | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 1bc12619bedd..b2d2f4539a3f 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1965,6 +1965,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. kmemcheck=2 (one-shot mode) Default: 2 (one-shot mode)

+ kpti= [ARM64] Control page table isolation of user + and kernel address spaces. + Default: enabled on cores which need mitigation. + 0: force disabled + 1: force enabled + kstack=N [X86] Print N words from the kernel stack in oops dumps.