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 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 98CBFC83F17 for ; Fri, 18 Jul 2025 13:48:37 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.1048794.1418985 (Exim 4.92) (envelope-from ) id 1uclRh-0004hz-HT; Fri, 18 Jul 2025 13:48:17 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1048794.1418985; Fri, 18 Jul 2025 13:48:17 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uclRh-0004hs-EH; Fri, 18 Jul 2025 13:48:17 +0000 Received: by outflank-mailman (input) for mailman id 1048794; Fri, 18 Jul 2025 13:48:16 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uclRg-0004hm-B2 for xen-devel@lists.xenproject.org; Fri, 18 Jul 2025 13:48:16 +0000 Received: from mail-ed1-x52b.google.com (mail-ed1-x52b.google.com [2a00:1450:4864:20::52b]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id da50e04f-63dd-11f0-a319-13f23c93f187; Fri, 18 Jul 2025 15:48:15 +0200 (CEST) Received: by mail-ed1-x52b.google.com with SMTP id 4fb4d7f45d1cf-612b67dcb89so2572219a12.1 for ; Fri, 18 Jul 2025 06:48:15 -0700 (PDT) Received: from [192.168.1.183] (host-195-149-20-212.as13285.net. [195.149.20.212]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-612c904049esm1022257a12.34.2025.07.18.06.48.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 18 Jul 2025 06:48:14 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: da50e04f-63dd-11f0-a319-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.com; s=google; t=1752846494; x=1753451294; darn=lists.xenproject.org; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to; bh=N66be0Xg207tt/bg6Lpbj+H5PyJV0QkAkMAO5IiJ6c4=; b=ePnYj2XKFsxbo/IXkB/sH7pGBNvD+0ISdT1zkkprSlFWGmMVR/pgEABj8cvUEIMFbe u71l+sEihBALEq5UMNosBIMavd/l1QWSJPDvoslKT/bS5bRavKkxZWo69Zdig5CGA9nW FQ4cAsbc/mNRKWh7QBWzBAX300gvvaX3CZQds= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1752846494; x=1753451294; h=content-transfer-encoding:in-reply-to:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=N66be0Xg207tt/bg6Lpbj+H5PyJV0QkAkMAO5IiJ6c4=; b=QCV9dVaoCXtRDp5fl7WQDKFUg6AR7e/obuJCZM6B+TVhXWZtIFjrOatbvd3SEiBton VZlDLLH/GnCg4ZGoh8y2weQyKk96PT1UdJ+CGrUvLzeTN06B4LHt6MnOsc91ZeNc95mT zBWhNz0PcVMZ9IUQtU6S9N4L4TUFNFSVTuUAFji3D7Yu7i+Yk+zPFlSY56Au9zde/vON Cf9pMJkzE+wNtH5LmzpkcwBd/kQE+x43cyByoQE9nFqrtPA3ALaI25EVlKZOwAvptRKg SKvD7hlamfCWzeVoqlirbD43XPwBejirCnJmb+6f8G13RmOavrVE73PlrwzzF9BBMomc SVdQ== X-Forwarded-Encrypted: i=1; AJvYcCXn8V3QLvKCGd007pa+ELQk8/Tfb4cOj84E6XvVbm5GD/NN8e8nNQLlHEPTFWzpPfmT6XNJGroCqKU=@lists.xenproject.org X-Gm-Message-State: AOJu0YxlNmmytvlks1j8xBn8E3V2KRO8kULVCq34xrv3PNTmMyl6/b1T m7yIOhKN9aHydI0BARRU3JH6rIFBL14yObEXjyrGOutKDW86RwfJMXj7VvHKjIDrcQc= X-Gm-Gg: ASbGncsug07AE6k10XHREgSI4Lt7Vzz2Y4NJgxgyvQ1jjCSgSewTCCzPFoeZDFpcxXx 3e6kOeTOubV1UX40LRj19v6Ivegv3ZJ5A8uiXlhMK27RxKuQKOCFPxF/PjZc8eIKcdPFstbOZHM IpqQ/9aHF/lCFLO+VLbdsMYEo6beuayNEcIUMyOVvzwPyi5LJswBZouGEmR8Yrxfm7isukSgz4y APXwrZOzG6aBp6oNIm3FnfJi3kdZs7ay7ogPboM2kHzQ0e1iaBgH7UtWQU8ZGgdBF4bTtPzV0+9 pom52RxfNPyppiswy4okj+MijGLO+jZxAtJzM/AagfqqFwnJhn+lW5CO91qH0LDcLSY2qxU9Os/ yuKFOaD1qCGTVeXblHFmH6alL6ysyPmISi2Ej2HoJ7LzV24fik1xGgIKu9rei17v8iUUdPPp9ZP CmQQ0= X-Google-Smtp-Source: AGHT+IHdpBTcpNNbOS/wHJ5+zNU8Cdar5Ibn2PFVINzZSCLc9rWC9QtAsIaSvdolRnmPxu27G+g+bw== X-Received: by 2002:a05:6402:34d0:b0:606:c8fa:d059 with SMTP id 4fb4d7f45d1cf-612859304admr9170829a12.14.1752846494531; Fri, 18 Jul 2025 06:48:14 -0700 (PDT) Message-ID: Date: Fri, 18 Jul 2025 14:48:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 5/6] x86/match-cpu: Support matching on steppings To: Jan Beulich Cc: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= , Xen-devel References: <20250716173132.2213891-1-andrew.cooper3@citrix.com> <20250716173132.2213891-6-andrew.cooper3@citrix.com> <03ecaa72-2370-47f7-b84b-83831d188f4e@citrix.com> <29cb9771-ee2a-4c7d-b661-74b37728bc2f@suse.com> <3cefd149-505f-4e29-8018-492886050c6f@citrix.com> <48e1c298-0afb-40a3-80a0-a5b97465ce4e@suse.com> Content-Language: en-GB From: Andrew Cooper Autocrypt: addr=andrew.cooper3@citrix.com; keydata= xsFNBFLhNn8BEADVhE+Hb8i0GV6mihnnr/uiQQdPF8kUoFzCOPXkf7jQ5sLYeJa0cQi6Penp VtiFYznTairnVsN5J+ujSTIb+OlMSJUWV4opS7WVNnxHbFTPYZVQ3erv7NKc2iVizCRZ2Kxn srM1oPXWRic8BIAdYOKOloF2300SL/bIpeD+x7h3w9B/qez7nOin5NzkxgFoaUeIal12pXSR Q354FKFoy6Vh96gc4VRqte3jw8mPuJQpfws+Pb+swvSf/i1q1+1I4jsRQQh2m6OTADHIqg2E ofTYAEh7R5HfPx0EXoEDMdRjOeKn8+vvkAwhviWXTHlG3R1QkbE5M/oywnZ83udJmi+lxjJ5 YhQ5IzomvJ16H0Bq+TLyVLO/VRksp1VR9HxCzItLNCS8PdpYYz5TC204ViycobYU65WMpzWe LFAGn8jSS25XIpqv0Y9k87dLbctKKA14Ifw2kq5OIVu2FuX+3i446JOa2vpCI9GcjCzi3oHV e00bzYiHMIl0FICrNJU0Kjho8pdo0m2uxkn6SYEpogAy9pnatUlO+erL4LqFUO7GXSdBRbw5 gNt25XTLdSFuZtMxkY3tq8MFss5QnjhehCVPEpE6y9ZjI4XB8ad1G4oBHVGK5LMsvg22PfMJ ISWFSHoF/B5+lHkCKWkFxZ0gZn33ju5n6/FOdEx4B8cMJt+cWwARAQABzSlBbmRyZXcgQ29v cGVyIDxhbmRyZXcuY29vcGVyM0BjaXRyaXguY29tPsLBegQTAQgAJAIbAwULCQgHAwUVCgkI CwUWAgMBAAIeAQIXgAUCWKD95wIZAQAKCRBlw/kGpdefoHbdD/9AIoR3k6fKl+RFiFpyAhvO 59ttDFI7nIAnlYngev2XUR3acFElJATHSDO0ju+hqWqAb8kVijXLops0gOfqt3VPZq9cuHlh IMDquatGLzAadfFx2eQYIYT+FYuMoPZy/aTUazmJIDVxP7L383grjIkn+7tAv+qeDfE+txL4 SAm1UHNvmdfgL2/lcmL3xRh7sub3nJilM93RWX1Pe5LBSDXO45uzCGEdst6uSlzYR/MEr+5Z JQQ32JV64zwvf/aKaagSQSQMYNX9JFgfZ3TKWC1KJQbX5ssoX/5hNLqxMcZV3TN7kU8I3kjK mPec9+1nECOjjJSO/h4P0sBZyIUGfguwzhEeGf4sMCuSEM4xjCnwiBwftR17sr0spYcOpqET ZGcAmyYcNjy6CYadNCnfR40vhhWuCfNCBzWnUW0lFoo12wb0YnzoOLjvfD6OL3JjIUJNOmJy RCsJ5IA/Iz33RhSVRmROu+TztwuThClw63g7+hoyewv7BemKyuU6FTVhjjW+XUWmS/FzknSi dAG+insr0746cTPpSkGl3KAXeWDGJzve7/SBBfyznWCMGaf8E2P1oOdIZRxHgWj0zNr1+ooF /PzgLPiCI4OMUttTlEKChgbUTQ+5o0P080JojqfXwbPAyumbaYcQNiH1/xYbJdOFSiBv9rpt TQTBLzDKXok86M7BTQRS4TZ/ARAAkgqudHsp+hd82UVkvgnlqZjzz2vyrYfz7bkPtXaGb9H4 Rfo7mQsEQavEBdWWjbga6eMnDqtu+FC+qeTGYebToxEyp2lKDSoAsvt8w82tIlP/EbmRbDVn 7bhjBlfRcFjVYw8uVDPptT0TV47vpoCVkTwcyb6OltJrvg/QzV9f07DJswuda1JH3/qvYu0p vjPnYvCq4NsqY2XSdAJ02HrdYPFtNyPEntu1n1KK+gJrstjtw7KsZ4ygXYrsm/oCBiVW/OgU g/XIlGErkrxe4vQvJyVwg6YH653YTX5hLLUEL1NS4TCo47RP+wi6y+TnuAL36UtK/uFyEuPy wwrDVcC4cIFhYSfsO0BumEI65yu7a8aHbGfq2lW251UcoU48Z27ZUUZd2Dr6O/n8poQHbaTd 6bJJSjzGGHZVbRP9UQ3lkmkmc0+XCHmj5WhwNNYjgbbmML7y0fsJT5RgvefAIFfHBg7fTY/i kBEimoUsTEQz+N4hbKwo1hULfVxDJStE4sbPhjbsPCrlXf6W9CxSyQ0qmZ2bXsLQYRj2xqd1 bpA+1o1j2N4/au1R/uSiUFjewJdT/LX1EklKDcQwpk06Af/N7VZtSfEJeRV04unbsKVXWZAk uAJyDDKN99ziC0Wz5kcPyVD1HNf8bgaqGDzrv3TfYjwqayRFcMf7xJaL9xXedMcAEQEAAcLB XwQYAQgACQUCUuE2fwIbDAAKCRBlw/kGpdefoG4XEACD1Qf/er8EA7g23HMxYWd3FXHThrVQ HgiGdk5Yh632vjOm9L4sd/GCEACVQKjsu98e8o3ysitFlznEns5EAAXEbITrgKWXDDUWGYxd pnjj2u+GkVdsOAGk0kxczX6s+VRBhpbBI2PWnOsRJgU2n10PZ3mZD4Xu9kU2IXYmuW+e5KCA vTArRUdCrAtIa1k01sPipPPw6dfxx2e5asy21YOytzxuWFfJTGnVxZZSCyLUO83sh6OZhJkk b9rxL9wPmpN/t2IPaEKoAc0FTQZS36wAMOXkBh24PQ9gaLJvfPKpNzGD8XWR5HHF0NLIJhgg 4ZlEXQ2fVp3XrtocHqhu4UZR4koCijgB8sB7Tb0GCpwK+C4UePdFLfhKyRdSXuvY3AHJd4CP 4JzW0Bzq/WXY3XMOzUTYApGQpnUpdOmuQSfpV9MQO+/jo7r6yPbxT7CwRS5dcQPzUiuHLK9i nvjREdh84qycnx0/6dDroYhp0DFv4udxuAvt1h4wGwTPRQZerSm4xaYegEFusyhbZrI0U9tJ B8WrhBLXDiYlyJT6zOV2yZFuW47VrLsjYnHwn27hmxTC/7tvG3euCklmkn9Sl9IAKFu29RSo d5bD8kMSCYsTqtTfT6W4A3qHGvIDta3ptLYpIAOD2sY3GYq2nf3Bbzx81wZK14JdDDHUX2Rs 6+ahAA== In-Reply-To: <48e1c298-0afb-40a3-80a0-a5b97465ce4e@suse.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 18/07/2025 2:28 pm, Jan Beulich wrote: >>>>>> uint16_t model; >>>>> Whereas the model is strictly limited to 8 bits. >>>> There is space in here, if we need it, but you can't shrink it without >>>> breaking the check for the NULL entry (going back to the first obfuscation). >>> Breaking? Or merely affecting code generation in a negative way? >> Shrinking model without adding (and checking) a new field would mean the >> loop condition no longer covers all metadata. > And it doesn't strictly need to. It needs to check enough to not mistake a > valid entry for a sentinel one. I've found a nicer way of doing this, but it needs another prereq patch.  I'm preparing a v2 with the remainder. It also addresses the horrible code generation. ~Andrew