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,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 520AEC433B4 for ; Wed, 28 Apr 2021 20:08:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C9E86143D for ; Wed, 28 Apr 2021 20:08:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241848AbhD1UJA (ORCPT ); Wed, 28 Apr 2021 16:09:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52834 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241753AbhD1UIy (ORCPT ); Wed, 28 Apr 2021 16:08:54 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 25CC8C061573 for ; Wed, 28 Apr 2021 13:08:08 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id i14so1041704pgk.5 for ; Wed, 28 Apr 2021 13:08:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=TvZXpxzUPr9ug6LqegfgGSaBKevdWw5NXJhgRMNXZU4=; b=XAyOcldawoNp4xxZKaCFJwhaVKU7aarB5d7FOUD4MFxkEcx0vWDw76h6mc3oWxEhe4 zb+Stz42JWDgk2Rd01bB9thXHKLVnPGZR7LfYd2ARwpkCKZkPAgd5nKsXVw2/JEDFqIz GqJ8OFl/tkRk8TbRWm05ROiYQzTQbZ6R1qFis= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=TvZXpxzUPr9ug6LqegfgGSaBKevdWw5NXJhgRMNXZU4=; b=pjcrXzobUEG67je4k9nVrXtfCPapVbI3oImPupEyuYM2v6S3kL7lJ1E9KXXMZb8Fu0 457Nu2LokHEnzMMMZYHi+nLqAaECccysmlULJsD5S8MjFIYxDiwE64HPde1gEReXNew6 6kgoRHrIWEG7mtDpupb06XFDA0QOSF63UZd/H33WYLO2jbaaCMCqPQb6v0CTPWqNjJqX vyYKY65hjUY/sakGm8iEZvHDUhIQH2fe46nhECvzdeBjLjuNbIYAcJ87oYBpQM5zXgwW 7zkd/9ZVa4onNfq8QC6Om8BO2ADpx0VjedvQo3MLvKZ58yNfi+fHmd1LBgPODln3H1GC 5JYA== X-Gm-Message-State: AOAM532vdfDB4f42aeJt2MN6+VAc7z6g0yPScCqGfjO/wI/WS4SvH1Vp iZNj/kkie0nwU8ROQ//uJJ72AHjvmJ+z7g== X-Google-Smtp-Source: ABdhPJymuryoOIzSsUYW/mEdqS2ZeTIOacznUj2T1axeJaT8m3GIu+b1jLrnLkQhShwEafAZbFkppA== X-Received: by 2002:a62:2904:0:b029:25c:13f2:47d4 with SMTP id p4-20020a6229040000b029025c13f247d4mr29929702pfp.4.1619640487586; Wed, 28 Apr 2021 13:08:07 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id a20sm446928pfi.138.2021.04.28.13.08.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Apr 2021 13:08:06 -0700 (PDT) Date: Wed, 28 Apr 2021 13:08:05 -0700 From: Kees Cook To: Thomas Gleixner Cc: bsingharora@gmail.com, "mingo@redhat.com" , "linux-kernel@vger.kernel.org" , "peterz@infradead.org" , "torvalds@linux-foundation.org" , "jpoimboe@redhat.com" , "x86@kernel.org" , "tony.luck@intel.com" , "dave.hansen@intel.com" , "thomas.lendacky@amd.com" , "benh@kernel.crashing.org" , linux-hardening@vger.kernel.org Subject: Re: [PATCH v4 0/5] Next revision of the L1D flush patches Message-ID: <202104281307.F9FCF660@keescook> References: <20210108121056.21940-1-sblbir@amazon.com> <202104081319.DAB1D817@keescook> <87y2d5tpjh.ffs@nanos.tec.linutronix.de> <87tunsofan.ffs@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87tunsofan.ffs@nanos.tec.linutronix.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 27, 2021 at 12:24:16AM +0200, Thomas Gleixner wrote: > On Mon, Apr 26 2021 at 10:31, Thomas Gleixner wrote: > > On Thu, Apr 08 2021 at 13:23, Kees Cook wrote: > >> > >> I'd still really like to see this -- it's a big hammer, but that's the > >> point for cases where some new flaw appears and we can point to the > >> toolbox and say "you can mitigate it with this while you wait for new > >> kernel/CPU." > >> > >> Any further thoughts from x86 maintainers? This seems like it addressed > >> all of tglx's review comments. > > > > Sorry for dropping the ball on this. It's in my list of things to deal > > with. Starting to look at it now. > > So I went through the pile and for remorse I sat down and made the > tweaks I think are necessary myself. > > I've pushed out the result to > > git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/l1dflush Oh excellent; thank you for doing this! -- Kees Cook