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=-11.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 2F164C432BE for ; Tue, 31 Aug 2021 03:50:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B7E7161039 for ; Tue, 31 Aug 2021 03:50:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org B7E7161039 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 505D68D0001; Mon, 30 Aug 2021 23:50:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 48D146B0072; Mon, 30 Aug 2021 23:50:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 354F88D0001; Mon, 30 Aug 2021 23:50:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0136.hostedemail.com [216.40.44.136]) by kanga.kvack.org (Postfix) with ESMTP id 22A5B6B0071 for ; Mon, 30 Aug 2021 23:50:05 -0400 (EDT) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id D3D101F36C for ; Tue, 31 Aug 2021 03:50:04 +0000 (UTC) X-FDA: 78533997528.04.A41BD80 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf16.hostedemail.com (Postfix) with ESMTP id 31BC6F00008F for ; Tue, 31 Aug 2021 03:50:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: Content-Type:In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To: Subject:Sender:Reply-To:Content-ID:Content-Description; bh=lfVb8puVRcwGOE5PDLqOhyWo7XCfNi3oWP2MVkqEJUg=; b=4aaxxn1fX31IknqwFBEe/0Chss bpw5rJy6r5lR6Z2g44ldILvB3cUun0PMP+VQwvetUMvlAsqi00sjXNFmhim1/h4lxOXaiZGF5MfUr NeDDv7ktu6u5L/hym8/9PjKCXM+/wgYlaFGNbbw8DjNLR4eY6MduPR64HKuoyO/OhTCJ/jfl53lI4 erPxqeUkWSkIE1NqolOIYGiTqvonADEjKsvciiVymftaTSv6AEGhjzv12Wfbh2EM80Nuu2LCY2WRb D4kmNPMSZC1gMnoI2LjSFlwSIN+HlSIU8I9rf+LXR0bSggIl4F0EogyNfYxYyTNJKxDpQ/2iLPnAF mjf10aaQ==; Received: from c-73-157-219-8.hsd1.or.comcast.net ([73.157.219.8] helo=[10.0.0.153]) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mKumb-001Fw8-Uz; Tue, 31 Aug 2021 03:49:58 +0000 Subject: Re: [RFC PATCH v2 18/19] x86/mm: Add PKS table soft mode To: Rick Edgecombe , dave.hansen@intel.com, luto@kernel.org, peterz@infradead.org, x86@kernel.org, akpm@linux-foundation.org, keescook@chromium.org, shakeelb@google.com, vbabka@suse.cz, rppt@kernel.org Cc: linux-mm@kvack.org, linux-hardening@vger.kernel.org, kernel-hardening@lists.openwall.com, ira.weiny@intel.com, dan.j.williams@intel.com, linux-kernel@vger.kernel.org References: <20210830235927.6443-1-rick.p.edgecombe@intel.com> <20210830235927.6443-19-rick.p.edgecombe@intel.com> From: Randy Dunlap Message-ID: <052d20c6-347d-6340-1a62-d62bf53d3315@infradead.org> Date: Mon, 30 Aug 2021 20:49:56 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20210830235927.6443-19-rick.p.edgecombe@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=4aaxxn1f; dmarc=none; spf=none (imf16.hostedemail.com: domain of rdunlap@infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=rdunlap@infradead.org X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 31BC6F00008F X-Stat-Signature: 1e3aab3f6miqn87rxkbshnsn1hefj6d4 X-HE-Tag: 1630381804-827177 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 8/30/21 4:59 PM, Rick Edgecombe wrote: > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 7902fce7f1da..8bb290fee77f 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -4254,6 +4254,10 @@ > nopti [X86-64] > Equivalent to pti=off > > + nopkstables [X86-64] Disable PKS page table protection > + > + pkstablessoft [X86-64] Warn instead of oops on pks tables violations preferably PKS > + > pty.legacy_count= > [KNL] Number of legacy pty's. Overwrites compiled-in > default number. -- ~Randy