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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 1B4BCC169C4 for ; Thu, 31 Jan 2019 17:59:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DC9292084A for ; Thu, 31 Jan 2019 17:59:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727885AbfAaR7E (ORCPT ); Thu, 31 Jan 2019 12:59:04 -0500 Received: from foss.arm.com ([217.140.101.70]:48998 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727838AbfAaR7D (ORCPT ); Thu, 31 Jan 2019 12:59:03 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 96CDCA78; Thu, 31 Jan 2019 09:59:02 -0800 (PST) Received: from donnerap.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DDFEA3F59C; Thu, 31 Jan 2019 09:58:59 -0800 (PST) Date: Thu, 31 Jan 2019 17:58:56 +0000 From: Andre Przywara To: Jeremy Linton Cc: linux-arm-kernel@lists.infradead.org, stefan.wahren@i2se.com, Jonathan Corbet , mlangsdo@redhat.com, linux-doc@vger.kernel.org, suzuki.poulose@arm.com, marc.zyngier@arm.com, catalin.marinas@arm.com, julien.thierry@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, steven.price@arm.com, ykaukab@suse.de, dave.martin@arm.com, shankerd@codeaurora.org Subject: Re: [PATCH v4 01/12] Documentation: Document arm64 kpti control Message-ID: <20190131175856.2ce5e226@donnerap.cambridge.arm.com> In-Reply-To: <20190125180711.1970973-2-jeremy.linton@arm.com> References: <20190125180711.1970973-1-jeremy.linton@arm.com> <20190125180711.1970973-2-jeremy.linton@arm.com> Organization: ARM X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; aarch64-unknown-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 25 Jan 2019 12:07:00 -0600 Jeremy Linton wrote: > 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 > Cc: Jonathan Corbet > Cc: linux-doc@vger.kernel.org Reviewed-by: Andre Przywara Cheers, Andre. > --- > 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) >