From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D70CC2D0DB for ; Tue, 28 Jan 2020 13:59:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 25F5E2173E for ; Tue, 28 Jan 2020 13:59:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580219957; bh=irdt0xLdWjAFLPL8/CXs3avNPS/yE86ffPVP2l74FhI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=dsXzdsEt3PGYqVZ6sYvdBAqA1YaikFQq9uovHWr++V/z/B6Gau2MNEZWCZOhxsPYp GAPNYAFFCu5MUWZIvqhKUKH8WuB+0ICupUlPs4gFibcn+YTAnqFO/vaQNa1RkkOC/b mszq13JFe+Duoy82GDo/MwtLfxNrBeAjEozEDm8Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726808AbgA1N7Q (ORCPT ); Tue, 28 Jan 2020 08:59:16 -0500 Received: from mail.kernel.org ([198.145.29.99]:44454 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726787AbgA1N7L (ORCPT ); Tue, 28 Jan 2020 08:59:11 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2EA8624691; Tue, 28 Jan 2020 13:59:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580219950; bh=irdt0xLdWjAFLPL8/CXs3avNPS/yE86ffPVP2l74FhI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z3ngUtuYXhljMH+B4vWsB5zi9t+cPsc02f9YCsC3Wcko9Ff82BU8HDhfSyCXsZDHE nkWhfG6S+q5gSU1Rp/Dn3s83qQ8flylEoJRHqG2tb6/mcjF6JpcmBqobH0f+/c62HW Rr5u5riEeKL6cgjNZp6RcFGQqBF8WNBkqwlvvnVk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jeremy Linton , Andre Przywara , Jonathan Corbet Subject: [PATCH 4.14 26/46] Documentation: Document arm64 kpti control Date: Tue, 28 Jan 2020 14:58:00 +0100 Message-Id: <20200128135753.205297926@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200128135749.822297911@linuxfoundation.org> References: <20200128135749.822297911@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jeremy Linton 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 Reviewed-by: Andre Przywara Signed-off-by: Jonathan Corbet Signed-off-by: Greg Kroah-Hartman --- Documentation/admin-guide/kernel-parameters.txt | 6 ++++++ 1 file changed, 6 insertions(+) --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1845,6 +1845,12 @@ 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)