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From:   Jeremy Linton <jeremy.linton@arm.com>
To:     linux-arm-kernel@lists.infradead.org
Cc:     catalin.marinas@arm.com, will.deacon@arm.com, marc.zyngier@arm.com,
        suzuki.poulose@arm.com, dave.martin@arm.com,
        shankerd@codeaurora.org, linux-kernel@vger.kernel.org,
        ykaukab@suse.de, julien.thierry@arm.com, mlangsdo@redhat.com,
        steven.price@arm.com, stefan.wahren@i2se.com,
        Jeremy Linton <jeremy.linton@arm.com>,
        Jonathan Corbet <corbet@lwn.net>, linux-doc@vger.kernel.org
Subject: [PATCH v4 01/12] Documentation: Document arm64 kpti control
Date:   Fri, 25 Jan 2019 12:07:00 -0600
Message-Id: <20190125180711.1970973-2-jeremy.linton@arm.com>
In-Reply-To: <20190125180711.1970973-1-jeremy.linton@arm.com>
References: <20190125180711.1970973-1-jeremy.linton@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
---
 Documentation/admin-guide/kernel-parameters.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index b799bcf67d7b..9475f02c79da 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1982,6 +1982,12 @@
 			Built with CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y,
 			the default is off.
 
+	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
+
 	kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs.
 			Default is 0 (don't ignore, but inject #GP)
 
-- 
2.17.2