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.gnu.org (lists.gnu.org [209.51.188.17]) (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 5A454C2A074 for ; Sun, 4 Jan 2026 10:49:52 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vcLfc-0003IH-CF; Sun, 04 Jan 2026 05:49:12 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vcLfY-0003Hx-JU for qemu-devel@nongnu.org; Sun, 04 Jan 2026 05:49:08 -0500 Received: from mail-westcentralusazon11013056.outbound.protection.outlook.com ([40.93.201.56] helo=CY3PR05CU001.outbound.protection.outlook.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vcLfU-0003tp-RR for qemu-devel@nongnu.org; Sun, 04 Jan 2026 05:49:08 -0500 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=PEyMOPuVzDkWlEZWNMXVD2o0s8dAY4Xemthp4jxZVtTTuMpEu+s1LCoWOhk/zSUTPTTjBa9+oaLGg2i5iKwACglu7imXTzU7apaJi5YqPynwsE/C/pLEfY5RH4HrRzL8P2p4/d6eqS1j/blHDz9J5OC13nypdbRaA4h+x+/ji/CrMhYJIraII3Xjyr7/SKVZ3tlejXizXj0xs3S6niQdE60QhAWAXeGJY6cP3hCxKieEsr27NPjU9hJqBZh91pX3iDlZ8kyUQe+0X2mv/CZgRwsgBizhUopvg2paxpQkb/qiAz/xTXjvfZnaaWqpxODwwMQKOCAAyIEMlL2HJZHTpA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=U+Xh2xCbPHn0p/WPb4D5BwW4iCuIgFzfLu/4Jzi7wJE=; b=dBcl+xVlOF6gh59eA/ASHK55q7VEn/NIA3dqwWO12iiynbZeoyFet5Uw6gNULcjWClTbfnvF0wAX96DvHNdo4imHPJa3T5zGWJDqNhNQw4CLArx1MJjuu/xVwIdbbgKP1EuvS+R6gW2FPfZ1P6f6dvAJSw7mcVPGheBjR6g+ZNJ3a+5uqy06yfzaVncgGOcVggyRzBxld/zBis6m45PLZD8ntO3CksL3uSDMREyrPNnC7YtThzOPhFfVuKFBolYGRjkM72S/OSSDjRkiZg0F7IQZHv1i/78nf6JcCxwvjIoZjGVLmtBBIhlF97khbjThWo7CITLN9Kxu1jmY90cuuQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=U+Xh2xCbPHn0p/WPb4D5BwW4iCuIgFzfLu/4Jzi7wJE=; b=xD4/BZzqbCAJT+YN11IjGbluD4D4wqVDbWkMxg35bXeyHFmftUo8VGr0FqEN7ebvJuPTivNNv3eolcGliqAb/+w8VXmpkrYJY+Y049NJ5NZ9uX0O//XB7p50eEsUAPICbpA52O+QkLp+SMK0RBCJIDr0oB3K8TkloSLYR0zuaTM= Received: from PH7P220CA0017.NAMP220.PROD.OUTLOOK.COM (2603:10b6:510:326::9) by SN7PR12MB6713.namprd12.prod.outlook.com (2603:10b6:806:273::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9456.14; Sun, 4 Jan 2026 10:43:57 +0000 Received: from CY4PEPF0000EE34.namprd05.prod.outlook.com (2603:10b6:510:326:cafe::82) by PH7P220CA0017.outlook.office365.com (2603:10b6:510:326::9) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9478.4 via Frontend Transport; Sun, 4 Jan 2026 10:43:52 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by CY4PEPF0000EE34.mail.protection.outlook.com (10.167.242.40) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9499.1 via Frontend Transport; Sun, 4 Jan 2026 10:43:56 +0000 Received: from satlexmb07.amd.com (10.181.42.216) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Sun, 4 Jan 2026 04:43:55 -0600 Received: from [10.65.98.143] (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.17 via Frontend Transport; Sun, 4 Jan 2026 02:43:53 -0800 Message-ID: <8f91be85-d1e7-4b5b-9ae2-e88e0f1c33cf@amd.com> Date: Sun, 4 Jan 2026 18:43:47 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/1] numa: add 'spm' option for Specific Purpose Memory To: "David Hildenbrand (Red Hat)" , Jonathan Cameron CC: , , , , Alistair Popple , "Bhardwaj, Rajneesh" , Paul Blinzer , References: <20251209093841.2250527-1-FangSheng.Huang@amd.com> <20251209093841.2250527-2-FangSheng.Huang@amd.com> <20251223095605.0000065d@huawei.com> <586a3535-ffa1-4d13-8bb5-c1b922a90a43@kernel.org> <9713eeae-65fb-4b6e-b5c8-5ffc2c5b4044@kernel.org> From: "Huang, FangSheng (Jerry)" In-Reply-To: <9713eeae-65fb-4b6e-b5c8-5ffc2c5b4044@kernel.org> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE34:EE_|SN7PR12MB6713:EE_ X-MS-Office365-Filtering-Correlation-Id: 2b885278-56d0-4205-002e-08de4b7e294f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|1800799024|82310400026|376014|36860700013; X-Microsoft-Antispam-Message-Info: =?utf-8?B?b1ZzaFIwTGsxTTNoaVNQbmVMbVhZeHNtMkNmZXRZWnZkSmhFUTNvWkpoR2hT?= =?utf-8?B?cGNiNllnSzZkL2VEWDFZbG95QjlkVEtLaXlMd0hzOThLdzN6YnIwZERYVGhC?= =?utf-8?B?MkZXMUE0RnF3eFFEL0dHOWhqMFVPRS84dm1uUmFSa3JRc2VqRG9oQ3dSWFhJ?= =?utf-8?B?cnR2UnhuMjc5UUQ0aVk1bTcvdGF3QzR1MUFkc0V4VmgrRkljV2Y5bWI5Z0tF?= =?utf-8?B?UXFJV0FJN3YrV2MwSVlPNWpwOGNFT2tZR01IMXVZTU5nc0FHSy8xeDZQREQ4?= =?utf-8?B?Q05nNUM2WWxIWVVuZW1XNC9INU1tRE1NVlNTV3MwZ1I4NXg5eXNycmlhR0Nh?= =?utf-8?B?eDRyUkNrNVZGR0puUmgwUnlDSElLZldZSE1uTWZiS0FiSzRtbU83RUFRNVZO?= =?utf-8?B?bjQ3cXNaUjlyazRuY0pDUFhGbEZFcUF3MzBHeVVPVjVoMVVVWjBhU21FSUpH?= =?utf-8?B?eDVyNDFkckZXaWFjaHNOSTM5RlVFUmNaL2thQ2hhbjZ6Ym5mOHdyU0tlTWR2?= =?utf-8?B?d1lPanp2UVVGK2FWSkFIYVd0NzZNTFdMVTB5dy8vQ0N1d212UmxPeFU2dWR5?= =?utf-8?B?cEFuTXFqbERwcUpWUXpGbjY0K1pUYzdpYTFSN1pPL1ZOMmlXYnZwZW5CWU5p?= =?utf-8?B?eThxV3dubDY4Z203aGF6M0tqQlZvU3o1SUFvTUZ4NXYxM3J2cGdid3R4UXht?= =?utf-8?B?K2lQdE9sRTB1NHhBSkJmY0NzK0FaeDJEQkZVajY0bk1Ob2hVS0VDV0xVNHFo?= =?utf-8?B?Y1k3Ui9FeWpMSDFiNG1ZYk9vUjFMaTc4MUpnTVFJS21tSjMxdlAvalZoVFJY?= =?utf-8?B?Vm5saCtaYkdqVExlTnJtVlllSnZyZmEzdmtVb1lacElnRFVSbTNyc2Zhb1FO?= =?utf-8?B?YlZvTGJ4NHpGQzBYM29CZk42WVhrd0wydW9KbC8zUWRqbFphd2hjVDc0MDVD?= =?utf-8?B?RUk1TGVHajlXcXZKRGNRcW9SM2lzL0c2YkRLZnpCUzQ4UlRPSXVUaGdDeklF?= =?utf-8?B?QlJKQVErUWUzWjVxMzQ5Y1dDMDFoZG1hcFpyaHVqaS95K3ZLZFlmb1ptbFJp?= =?utf-8?B?RU00Rm5XY3kwYXdWazFidG9UNS94N2Q3TXlOdElLYVEzR2pTVjBvWWF4Ti9q?= =?utf-8?B?ZVowVmc2VnhORFB2dm90NXdXaUNTZDBRazRudEtJeGJubTYyOXlBZzl4MlVL?= =?utf-8?B?R1h0Z1luMU9OL0IyWHRSaXQwUy8rNnlkdzRBSDc4QkQzRk1Ed09pUWorQ2hQ?= =?utf-8?B?ekZPbVB6NEJiTE9xSVczV2RtMlVTNmxUNVJYUy9IVlZJWTRrb0NvRkVicVp1?= =?utf-8?B?K21tTjQrVkpFamtTK3N1ZHJGOU53NnAxSk03c1JucjlVWFRGQ1RnVWRCODZO?= =?utf-8?B?cVB1aDZJTzY4YTVJM01uZm5zYUdzY2J4SG1SenZQTm9hOUg3OFdPdkY3MFJX?= =?utf-8?B?MDRCYnZHdVlQUkN0UGt2WERjYldIR2M0WC9IZzh4V0g4NjN2N0FSMnYxaWs2?= =?utf-8?B?akhHUVBFeFV6SVM5V08vV283NFpVL21ZQmVMOVdrR25mcm9kZnNCSHh3dW9E?= =?utf-8?B?VVNvUCs3cklLekQrSjNyb0UwM3c5RUlsN0tPUnNBcWFjQU55dEpiaEV1N2dO?= =?utf-8?B?bXpDWENJKzhDUXZ1YkhmdUd3SEVNVlFCQ3dMK2ZlTy9HdEtvY3l3bkk4MDdO?= =?utf-8?B?NlViYi96U08rMFZMMEphMjlldmV4dEN3amdEK1lBNE01Z0RyTy9GdEk0WFFk?= =?utf-8?B?WmFuMHRtbnNKVThDTlhVc2lNN1lpNHhKWjUzUmZzeFRaT2JMQ1RrbkJiVU5V?= =?utf-8?B?eFAxUklwc0JOMHhENlJCTG5YYUdmMUhGRVRhTVd1MERaTHNRSFptdlA1WGNx?= =?utf-8?B?OXRPMEluRGNVbzJ4MmEzYk9LS21OUmJmcGVKSWFPTDBiYm9zUFpMMXRYcjc5?= =?utf-8?B?OUJ4ZE9EV2piQmErQ1VJUEQ4ckFEekJvQ3N6VG1hSWdyZ2srM042aGlsTWsv?= =?utf-8?B?TFVYeW9FYmdFeUZHcTFWeUlOZFhHRFBkQWR2aVZ6eDdMK1Qza3MxSG9oWnhR?= =?utf-8?B?Qmo2STQzOHpTTE1ERXRaem9uM3JERGFxY1BjRFNHT3VCazE0NlpNdTZ3U3pa?= =?utf-8?Q?5FTk=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:satlexmb07.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(1800799024)(82310400026)(376014)(36860700013); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jan 2026 10:43:56.3253 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2b885278-56d0-4205-002e-08de4b7e294f X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE34.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6713 Received-SPF: permerror client-ip=40.93.201.56; envelope-from=FangSheng.Huang@amd.com; helo=CY3PR05CU001.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 12/31/2025 4:09 AM, David Hildenbrand (Red Hat) wrote: >>> >>> Just curious, it's the same on real hardware, right? >>> >> >> Hi David, could you clarify what you're asking about? Whether the SPM >> semantics are the same, or whether this QEMU implementation matches real >> hardware behavior? > > Yes exactly. If it matches real hardware behavior then there are no real > surprises exposed by the QEMU implementation. > For the SBIOS pre-configured scenario, yes, it matches. This QEMU implementation assumes SBIOS pre-configures the NUMA node with SPM via SRAT/E820 - SPM is static boot memory from VM start. One potential difference on real hardware: SPM might be initially soft-reserved by SBIOS, then dynamically added to a NUMA node via add_memory_driver_managed() at runtime. In that case, it's not pre-bound boot memory. This patch targets the first scenario, which should have no surprises. Thanks, Jerry