linux-kernel - [PATCH stable-4.9] Documentation: Document arm64 kpti control

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Message-Id: <20200128015415.2276-1-f.fainelli@gmail.com>
Date:   Mon, 27 Jan 2020 17:54:14 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-vger@...nel.org
Cc:     stable@...r.kernel.org, jeremy.linton@....com,
        gregkh@...uxfoundation.org, sashal@...nel.org,
        Jonathan Corbet <corbet@....net>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-doc@...r.kernel.org (open list:DOCUMENTATION),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH stable-4.9] 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>
---
 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.
 
-- 
2.17.1