Received: by 2002:a05:6a10:8c0a:0:0:0:0 with SMTP id go10csp3466200pxb; Sun, 7 Feb 2021 10:21:28 -0800 (PST) X-Google-Smtp-Source: ABdhPJymP1lf/mIuBPNnWn6Hjbddkhm9ePOP5+QYvLLZdA/cyZp8tGNm1bucoRmRy7KxkKhYYLk2 X-Received: by 2002:a05:6402:2553:: with SMTP id l19mr13447743edb.326.1612722088514; Sun, 07 Feb 2021 10:21:28 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1612722088; cv=none; d=google.com; s=arc-20160816; b=c8QucdoQ3NnfEjYK9oJ4v3hcUheD5Olx+Lx2iICFpVOIXYJDkw68mQbilX16TeLb0N eXGXKOEo9W7KM0wO7pJrOwJrIvwkLWBoCb3zdfR4MelnMQP06QGhHe/oraPf1w5EhKWK MV3b20XRaP8etfvMlRNCcdyp8zS1AJ+8adYJbnhDbbBUA404kP9Ivx8vw1cJ/mfKy49M YXJPqkclEbHMT8KSmO5UbnK/ZY+8wEJl/KCyeufEwTTAFIs4kDiuQb/bO5xDjG1Rvs/4 kWVkfS4ec+cR0RUnVXB5IikutmjF2uBcOoKzQcY6fy0u2YJev0kjbwpQl+N2DMx8ow30 DaOw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:content-language :in-reply-to:mime-version:user-agent:date:message-id:autocrypt:from :references:cc:to:subject:ironport-sdr:ironport-sdr; bh=jBwGtG8c9o+2MuO43ongpVOBu8hwkls3MAzvqrvpvs0=; b=QljJmcENkopSh92c7nRXd3ICqQKqIAGUpQ8PBMU3GXq/NsxTGMBMDpHQ4uHmQppkOi RpfISMjjeGSk5KYhkcpQCva5Xe+JBRNwJ9ysz7mavu3LveCJwiK1ttWObXpiMOcpxXy3 gY5GpswHXLZ1r4RHh66BXsH+qvZySWD9ykQVGT5RxL8y8cjklw20hOQIQKohx6LuSLte KHNzZE+4aOkh4TEe78/HTXhA83x0nYDE2jzOLTnijr3SXfiurQNuFQQzjr3kgwL0nQKU d8TJiKRuw8jmFAmwcTvmk1osvdPOkSzVvPJNMgU0KARy39iFMgx4ifm8uXiFQ15nsON1 Aerg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id jv10si9190590ejc.625.2021.02.07.10.21.03; Sun, 07 Feb 2021 10:21:28 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229491AbhBGSUB (ORCPT + 99 others); Sun, 7 Feb 2021 13:20:01 -0500 Received: from mga01.intel.com ([192.55.52.88]:52067 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229638AbhBGSUA (ORCPT ); Sun, 7 Feb 2021 13:20:00 -0500 IronPort-SDR: zGZCzOed7USXSwjwpbxNkXc6vL20dedQqHJ5atorORliys0xVRz2tvvVdm7Gi8cgphoiWV99L6 kISXa6gIb61A== X-IronPort-AV: E=McAfee;i="6000,8403,9888"; a="200671300" X-IronPort-AV: E=Sophos;i="5.81,160,1610438400"; d="scan'208";a="200671300" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Feb 2021 10:19:16 -0800 IronPort-SDR: 1Eb65m608fZEnL/EIPW/PYnn6NnrOy3mnTeWGbFOYN/A2NN8UKn9/mr0+cHFF7dAwwUHoT24gO iR362I4+sCZg== X-IronPort-AV: E=Sophos;i="5.81,160,1610438400"; d="scan'208";a="376835646" Received: from yramx-mobl1.amr.corp.intel.com (HELO [10.213.174.131]) ([10.213.174.131]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Feb 2021 10:19:16 -0800 Subject: Re: [GIT PULL] x86/urgent for v5.11-rc7 To: Borislav Petkov , Linus Torvalds Cc: Steven Rostedt , x86-ml , lkml References: <20210207104022.GA32127@zn.tnic> <20210207175814.GF32127@zn.tnic> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzShEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gPGRhdmVAc3I3MS5uZXQ+wsF7BBMBAgAlAhsDBgsJCAcDAgYVCAIJ CgsEFgIDAQIeAQIXgAUCTo3k0QIZAQAKCRBoNZUwcMmSsMO2D/421Xg8pimb9mPzM5N7khT0 2MCnaGssU1T59YPE25kYdx2HntwdO0JA27Wn9xx5zYijOe6B21ufrvsyv42auCO85+oFJWfE K2R/IpLle09GDx5tcEmMAHX6KSxpHmGuJmUPibHVbfep2aCh9lKaDqQR07gXXWK5/yU1Dx0r VVFRaHTasp9fZ9AmY4K9/BSA3VkQ8v3OrxNty3OdsrmTTzO91YszpdbjjEFZK53zXy6tUD2d e1i0kBBS6NLAAsqEtneplz88T/v7MpLmpY30N9gQU3QyRC50jJ7LU9RazMjUQY1WohVsR56d ORqFxS8ChhyJs7BI34vQusYHDTp6PnZHUppb9WIzjeWlC7Jc8lSBDlEWodmqQQgp5+6AfhTD kDv1a+W5+ncq+Uo63WHRiCPuyt4di4/0zo28RVcjtzlGBZtmz2EIC3vUfmoZbO/Gn6EKbYAn rzz3iU/JWV8DwQ+sZSGu0HmvYMt6t5SmqWQo/hyHtA7uF5Wxtu1lCgolSQw4t49ZuOyOnQi5 f8R3nE7lpVCSF1TT+h8kMvFPv3VG7KunyjHr3sEptYxQs4VRxqeirSuyBv1TyxT+LdTm6j4a mulOWf+YtFRAgIYyyN5YOepDEBv4LUM8Tz98lZiNMlFyRMNrsLV6Pv6SxhrMxbT6TNVS5D+6 UorTLotDZKp5+M7BTQRUY85qARAAsgMW71BIXRgxjYNCYQ3Xs8k3TfAvQRbHccky50h99TUY sqdULbsb3KhmY29raw1bgmyM0a4DGS1YKN7qazCDsdQlxIJp9t2YYdBKXVRzPCCsfWe1dK/q 66UVhRPP8EGZ4CmFYuPTxqGY+dGRInxCeap/xzbKdvmPm01Iw3YFjAE4PQ4hTMr/H76KoDbD cq62U50oKC83ca/PRRh2QqEqACvIH4BR7jueAZSPEDnzwxvVgzyeuhwqHY05QRK/wsKuhq7s UuYtmN92Fasbxbw2tbVLZfoidklikvZAmotg0dwcFTjSRGEg0Gr3p/xBzJWNavFZZ95Rj7Et db0lCt0HDSY5q4GMR+SrFbH+jzUY/ZqfGdZCBqo0cdPPp58krVgtIGR+ja2Mkva6ah94/oQN lnCOw3udS+Eb/aRcM6detZr7XOngvxsWolBrhwTQFT9D2NH6ryAuvKd6yyAFt3/e7r+HHtkU kOy27D7IpjngqP+b4EumELI/NxPgIqT69PQmo9IZaI/oRaKorYnDaZrMXViqDrFdD37XELwQ gmLoSm2VfbOYY7fap/AhPOgOYOSqg3/Nxcapv71yoBzRRxOc4FxmZ65mn+q3rEM27yRztBW9 AnCKIc66T2i92HqXCw6AgoBJRjBkI3QnEkPgohQkZdAb8o9WGVKpfmZKbYBo4pEAEQEAAcLB XwQYAQIACQUCVGPOagIbDAAKCRBoNZUwcMmSsJeCEACCh7P/aaOLKWQxcnw47p4phIVR6pVL e4IEdR7Jf7ZL00s3vKSNT+nRqdl1ugJx9Ymsp8kXKMk9GSfmZpuMQB9c6io1qZc6nW/3TtvK pNGz7KPPtaDzvKA4S5tfrWPnDr7n15AU5vsIZvgMjU42gkbemkjJwP0B1RkifIK60yQqAAlT YZ14P0dIPdIPIlfEPiAWcg5BtLQU4Wg3cNQdpWrCJ1E3m/RIlXy/2Y3YOVVohfSy+4kvvYU3 lXUdPb04UPw4VWwjcVZPg7cgR7Izion61bGHqVqURgSALt2yvHl7cr68NYoFkzbNsGsye9ft M9ozM23JSgMkRylPSXTeh5JIK9pz2+etco3AfLCKtaRVysjvpysukmWMTrx8QnI5Nn5MOlJj 1Ov4/50JY9pXzgIDVSrgy6LYSMc4vKZ3QfCY7ipLRORyalFDF3j5AGCMRENJjHPD6O7bl3Xo 4DzMID+8eucbXxKiNEbs21IqBZbbKdY1GkcEGTE7AnkA3Y6YB7I/j9mQ3hCgm5muJuhM/2Fr OPsw5tV/LmQ5GXH0JQ/TZXWygyRFyyI2FqNTx4WHqUn3yFj8rwTAU1tluRUYyeLy0ayUlKBH ybj0N71vWO936MqP6haFERzuPAIpxj2ezwu0xb1GjTk4ynna6h5GjnKgdfOWoRtoWndMZxbA z5cecg== Message-ID: <661b9809-2c6a-5fc8-163b-a159b84c9ab8@intel.com> Date: Sun, 7 Feb 2021 10:19:14 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210207175814.GF32127@zn.tnic> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/7/21 9:58 AM, Borislav Petkov wrote: > On Sun, Feb 07, 2021 at 09:49:18AM -0800, Linus Torvalds wrote: >> On Sun, Feb 7, 2021 at 2:40 AM Borislav Petkov wrote: >>> - Disable CET instrumentation in the kernel so that gcc doesn't add >>> ENDBR64 to kernel code and thus confuse tracing. >> So this is clearly the right thing to do for now, but I wonder if >> people have a plan for actually enabling CET and endbr at cpl0 at some >> point? > It probably is an item on some Intel manager's to-enable list. So far, > the CET enablement concentrates only on userspace but dhansen might know > more about future plans. CCed. It's definitely on our radar to look at after CET userspace. The only question for me is whether it will be worth doing with the exiting kernel entry/exit architecture.