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=-8.4 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 3B233C433E7 for ; Tue, 20 Oct 2020 03:42:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C7E4A2244C for ; Tue, 20 Oct 2020 03:42:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="BVUKpXXD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391200AbgJTDmE (ORCPT ); Mon, 19 Oct 2020 23:42:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391172AbgJTDmE (ORCPT ); Mon, 19 Oct 2020 23:42:04 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF942C0613CE for ; Mon, 19 Oct 2020 20:42:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; 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=7Kkfr9DELie+hza5hnjVEJ8RrhQuKsRDtDHENuyGRTg=; b=BVUKpXXDDIxma3oBhedB12GUPL jPFLKu9uecc1tHQ0aeUnnFbXvTPO6GpNEtHX3Ub2bBG39Qm1+j1md6Y44ficsp/GThVXawIay8rZf Xl+wf0aBkR0xtlb23VvK6xrpHfOBe72cwmbN6v3gCmJduX6aTm4C6SonFIF0cvzzVcM4opv6dnAfu mGs56jKso0xBvxeCjwlaAKTT+j3LAAMCowzvovi1BLNxMUwrIq4qwVMCVFQXPYSlFdolHsR2VVkPp PDnIUhdZkcRIcsMmJ9ov38UrvbCIeiNJuAE5YT+kpAt9Vzynxg4l0T5oGivPdjbIC4Lb/RbrOmW5g XrC2Z4Hw==; Received: from [2601:1c0:6280:3f0::9850] (helo=dragon.site) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kUiWT-0002Mp-9t; Tue, 20 Oct 2020 03:41:17 +0000 Subject: Re: [PATCH v8 -tip 13/26] kernel/entry: Add support for core-wide protection of kernel-mode To: "Joel Fernandes (Google)" , Nishanth Aravamudan , Julien Desfossez , Peter Zijlstra , Tim Chen , Vineeth Pillai , Aaron Lu , Aubrey Li , tglx@linutronix.de, linux-kernel@vger.kernel.org Cc: mingo@kernel.org, torvalds@linux-foundation.org, fweisbec@gmail.com, keescook@chromium.org, kerrnel@google.com, Phil Auld , Valentin Schneider , Mel Gorman , Pawan Gupta , Paolo Bonzini , vineeth@bitbyteword.org, Chen Yu , Christian Brauner , Agata Gruza , Antonio Gomez Iglesias , graf@amazon.com, konrad.wilk@oracle.com, dfaggioli@suse.com, pjt@google.com, rostedt@goodmis.org, derkling@google.com, benbjiang@tencent.com, Alexandre Chartre , James.Bottomley@hansenpartnership.com, OWeisse@umich.edu, Dhaval Giani , Junaid Shahid , jsbarnes@google.com, chris.hyser@oracle.com, Aubrey Li , Tim Chen , "Paul E . McKenney" References: <20201020014336.2076526-1-joel@joelfernandes.org> <20201020014336.2076526-14-joel@joelfernandes.org> From: Randy Dunlap Message-ID: <13fac0b7-37cb-7313-efb6-ebe166121f8f@infradead.org> Date: Mon, 19 Oct 2020 20:41:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <20201020014336.2076526-14-joel@joelfernandes.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/19/20 6:43 PM, Joel Fernandes (Google) wrote: > > --- > .../admin-guide/kernel-parameters.txt | 7 + > include/linux/entry-common.h | 2 +- > include/linux/sched.h | 12 + > kernel/entry/common.c | 25 +- > kernel/sched/core.c | 229 ++++++++++++++++++ > kernel/sched/sched.h | 3 + > 6 files changed, 275 insertions(+), 3 deletions(-) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 3236427e2215..48567110f709 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -4678,6 +4678,13 @@ > > sbni= [NET] Granch SBNI12 leased line adapter > > + sched_core_protect_kernel= Needs a list of possible values after '=', along with telling us what the default value/setting is. > + [SCHED_CORE] Pause SMT siblings of a core running in > + user mode, if at least one of the siblings of the core > + is running in kernel mode. This is to guarantee that > + kernel data is not leaked to tasks which are not trusted > + by the kernel. > + thanks.