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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 E88E2C282D8 for ; Wed, 30 Jan 2019 18:02:58 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C1E0C21473 for ; Wed, 30 Jan 2019 18:02:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="rLO+VX32" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C1E0C21473 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=PUBGt6CRkHVT4quvkjl4sAT7NKzCycEzyso4RjCb/qY=; b=rLO+VX32Wd0iHr m3X0R7bgGrdMaJ/P2tuCsGUCD2sGxX8RqjF05ttUNug2T7uscCkuMLq/rU7qdEhqlqwKpZoMDiE4N cFMLbUzNhiLnO9/LAoR8sXTzA8Un0w3jrkXkb0G4leRAtaNKx19h7QObC/vhln7Un/M9S9+Ym7AnU 4L6oaRjKByX1Sb7SDwm4kCYoeunhkzjMG95EIRYohnn3+36nikcorifyzCNLWm09ikbwRxTwXEmj3 zK7AeYijzNq0EyKicr3Teb2YQIrazg5U383ltAlBeJ0fYc+NwzKQk4SSSx/nxS4lEGtaxuJLvxzjP holQeHlPi2HBnnKYXC5A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gouCP-0000YK-IO; Wed, 30 Jan 2019 18:02:57 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gouCM-0000Xt-56 for linux-arm-kernel@lists.infradead.org; Wed, 30 Jan 2019 18:02:55 +0000 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 4217F80D; Wed, 30 Jan 2019 10:02:53 -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 935993F557; Wed, 30 Jan 2019 10:02:50 -0800 (PST) Date: Wed, 30 Jan 2019 18:02:47 +0000 From: Andre Przywara To: Jeremy Linton Subject: Re: [PATCH v4 01/12] Documentation: Document arm64 kpti control Message-ID: <20190130180247.15ab0577@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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190130_100254_205815_8528F4A8 X-CRM114-Status: GOOD ( 16.33 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: stefan.wahren@i2se.com, Jonathan Corbet , julien.thierry@arm.com, mlangsdo@redhat.com, suzuki.poulose@arm.com, marc.zyngier@arm.com, catalin.marinas@arm.com, linux-doc@vger.kernel.org, will.deacon@arm.com, linux-kernel@vger.kernel.org, steven.price@arm.com, shankerd@codeaurora.org, ykaukab@suse.de, dave.martin@arm.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 25 Jan 2019 12:07:00 -0600 Jeremy Linton wrote: Hi, > 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 > --- > 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. Would this be a good place to mention that we enable it when CONFIG_RANDOMIZE_BASE is enabled and we have a valid kaslr_offset? I found this somewhat surprising, also it's unrelated to the vulnerability. Cheers, Andre > + 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) > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel