Received: by 2002:a05:6a10:f3d0:0:0:0:0 with SMTP id a16csp836634pxv; Thu, 1 Jul 2021 10:18:01 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxvrLY+FRDxs13mK9AbXW0vkQK66ECLxyOcDAiklQR9OZC6jVAFa9o7w6mPjGdifhop4gio X-Received: by 2002:a17:906:7955:: with SMTP id l21mr1007041ejo.394.1625159881680; Thu, 01 Jul 2021 10:18:01 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1625159881; cv=none; d=google.com; s=arc-20160816; b=FT9InCxemTA7xnflq/Z45lklPw6EGTwzwTxV0ZaP++J4K+ELJbe5C2hklLDJPGfx6N uwbZ/abCziEBNKCRQ642jxI/hR6EHBeBUQgdn3EWhT0kQ5jbxjHoR6pkEeqkxm6LSqjW mcc27E5CLfVMCWo7Uq8EEGk1UjvpGI9QjHHYXkOqNXMIjpobgZ+DXZm0JhFafA2kPjhE lNpX4lKHUj0pDjtLvVbf/TxrSRYkUC9epCq2vYqgG1fID0JcAFwBFew8/SFdYANv0vbm +wu1SlsxCW9fadGrz/igr4eCtqPbTYMgQ5D+qCCuHThw0paZ1PMNGlARjP8B6zav9jyY JYyw== 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; bh=Ptl63aessC5/eGQiwhVTb19FjMi3qSaSC0myXpVGxk4=; b=OkJYTlcckWFBAiPNQjSf/rdWfqF4OfErf/e6fzS9WuI50huXL9dxA2s9a6FeIlmyTG CJQXshmG3WfBKBCn5UX6FqnS0xnFgF2YbqI1WZlnsZZtjpFTZ7cgY7bHWfxkAWUGZAwO 9p3hLiZwuRqwSmELApZ25kDpqfwqHdLDJaTPU6zResKch/xc2H+1b3ne0jMhdjy0jNS6 jSjO4VIV8fac1Lb3Ny/sEnYICmHP+a5FSZH6QNxqoy9++A72KDL7P2pVPEAg6R3OAx/4 J/WwkHtbiX4wAfwv3Z097DnC5fowMqNmLJuL6dAytKY/8eFddb3Ns6JDR3YaNgYDNtNd Qbew== 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 7si352427edw.24.2021.07.01.10.17.34; Thu, 01 Jul 2021 10:18:01 -0700 (PDT) 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 S233041AbhGARSK (ORCPT + 99 others); Thu, 1 Jul 2021 13:18:10 -0400 Received: from mga12.intel.com ([192.55.52.136]:59747 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232516AbhGARSJ (ORCPT ); Thu, 1 Jul 2021 13:18:09 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10032"; a="188262483" X-IronPort-AV: E=Sophos;i="5.83,315,1616482800"; d="scan'208";a="188262483" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2021 10:15:32 -0700 X-IronPort-AV: E=Sophos;i="5.83,315,1616482800"; d="scan'208";a="626442990" Received: from acismesi-mobl1.amr.corp.intel.com (HELO [10.252.131.1]) ([10.252.131.1]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2021 10:15:31 -0700 Subject: Re: [PATCH 1/3] x86/setup: always reserve the first 1M of RAM To: Mike Rapoport , x86@kernel.org Cc: "H. Peter Anvin" , Andy Lutomirski , Andy Shevchenko , Ard Biesheuvel , Baoquan He , Borislav Petkov , Darren Hart , Dave Young , Hugh Dickins , Ingo Molnar , Jonathan Corbet , Lianbo Jiang , Mike Rapoport , Randy Dunlap , Thomas Gleixner , linux-doc@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org References: <20210601075354.5149-1-rppt@kernel.org> <20210601075354.5149-2-rppt@kernel.org> 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: Date: Thu, 1 Jul 2021 10:15:29 -0700 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: <20210601075354.5149-2-rppt@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/1/21 12:53 AM, Mike Rapoport wrote: > There are BIOSes that are known to corrupt the memory under 1M, or more > precisely under 640K because the memory above 640K is anyway reserved for > the EGA/VGA frame buffer and BIOS. Should there have been a Cc: stable@ on this? Seems like the kind of thing we'd want backported.