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Date: Tue, 28 Jan 2020 15:06:50 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jeremy Linton <jeremy.linton@....com>, Andre Przywara <andre.przywara@....com>, Jonathan Corbet <corbet@....net>, Florian Fainelli <f.fainelli@...il.com> Subject: [PATCH 4.9 261/271] Documentation: Document arm64 kpti control From: Jeremy Linton <jeremy.linton@....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@....com> Reviewed-by: Andre Przywara <andre.przywara@....com> Signed-off-by: Jonathan Corbet <corbet@....net> [florian: patch the correct file] Signed-off-by: Florian Fainelli <f.fainelli@...il.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- Documentation/kernel-parameters.txt | 6 ++++++ 1 file changed, 6 insertions(+) --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1965,6 +1965,12 @@ bytes respectively. Such letter suffixes 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.
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