From nobody Sun May 24 21:37:37 2026 Received: from PH0PR06CU001.outbound.protection.outlook.com (mail-westus3azon11011049.outbound.protection.outlook.com [40.107.208.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0FAAE35E944; Thu, 21 May 2026 08:33:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.208.49 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779352395; cv=fail; b=ayk8weOlUL8yrivcil8mLFHnk6QZ2Hv8EmZXZTIv/LZ1wf5Fg0QkFQHunN91GQik1ehOV03c2GnmeW43J+U5lcUId2AE+RmV55F0wKpZWv/MeeWcdHJl1kGmQMry1PpknWZU9uZ7AiJ5WFQhTvVS/ZhazGWGpTJ7MJW/9kRV5no= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779352395; c=relaxed/simple; bh=63lRmegzcJo4fx4pXgUq1E45fSAdd4bST3ccqlExpQ8=; h=From:To:Cc:Subject:Date:Message-ID:Content-Type:MIME-Version; b=gfsWqHseyD0bqKf78R+sO06FkJvzceBVcOv6eHoAUOJzmwj+PJXuN1nRl/ti9zfS+dLM5NhH6ENjTlro/id9ozYcPH9kMW2RRb8tiuyabNLiRW5NSGSGTdKfQCgRdNXIHRWwGY4+hK81OJfnTeXblrQSXcon2OjIbGfo0dCxDHc= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=Hnjd9pS/; arc=fail smtp.client-ip=40.107.208.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="Hnjd9pS/" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=ViyzMcdVMegxohO0mmGqtcnx3OCs7MTXRmO4ZIj1WjJzj+AMlcma3vTS8X8mqlF7f3rakOE/GWL4yUVz8QQeqFuNRyzpy9AyCMGSc41o6p2BK6sAqjcfh+lr6AZ98vp046ca57TZoGUbWqeCe/DsPMPyGoSoxwVvbDRQikq5r0i7kqo5/xuTV4Voo9fw2QqqEWHTcWhGvbsholXKAvYsWlchzrsJfdX8qEMFHcornKkIBtCDZWjVGei5hv84U/6XD9kgl+6dx/A6S/1JHyuKGH2fhhaapWVvOXVVXogI9YN0wd0lgIeXfbwivGL1BgNKBzzmyE+KtM+2s5dcZZEMpg== 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=dS2DJEJ4Jxsoyd+9+qlf9lVYf8JOK5g44M8PXGScHeE=; b=R+Syv9FLlFB+TaX/nOevcTm/efvmOneiTkFYGo1yh97gIKfrid64xypOaCpwHNjAXgj9e9N/HnJc3Pue7TFCjNkT6FeB1VSs8bCXeCE+UsNlt7Bg5k4xZ6lCwacxoB5qZD5ArFSbCCFavUigM199hvRy/NVW8QHmwdbndf0C2B3ZkGsSvzHurE8veKdVKrx4+2Nezj4g8SmxCZeEigs6tLfLpeKM8azHLCjVSOFkmEuKhQqU2QRDS6p4wU/+V0GRX2hJ8UHwsyBV0cfOT/IoBLqQJvwZcIMahXXoeKcjDO0BOAWttxwP5TfeTsEB5Lo7MySfjsJfQMPsOLGhyviN0g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=dS2DJEJ4Jxsoyd+9+qlf9lVYf8JOK5g44M8PXGScHeE=; b=Hnjd9pS/3sWwUXoIwTxQ4+gbZ1X4ZUahJ/7ejjyG1NXjxip+4Anz5Ku4uJbn37jt4Mk3oezufI920sPMVYmooXd3EMZKFbKFusq4NbCP0j0y1OtfX0eoY7aJFp6BNWodp8wvqdnDUJgYJI2AHA0HRPHepgxKVaaCKFiXSqR/Z7JjmhsgEF5UEKXVUNHedP93O2INViBeEqSuFFebUd8gBChUyEq7rA6IUftGbGPAMbPUbOcb9Sz98dBXOOKhXLUYstyR+7uIU7SvvdG92CeadFRFCQQ6qw04f8FZN72r8sGT5ib3UcxUHf5KjD39rrhu8fY0cHp+8slWg5PFnrSyXQ== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from BL0PR12MB2370.namprd12.prod.outlook.com (2603:10b6:207:47::27) by CH2PR12MB4070.namprd12.prod.outlook.com (2603:10b6:610:ae::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.48.14; Thu, 21 May 2026 08:33:05 +0000 Received: from BL0PR12MB2370.namprd12.prod.outlook.com ([fe80::86cf:c3ec:2cf5:74c8]) by BL0PR12MB2370.namprd12.prod.outlook.com ([fe80::86cf:c3ec:2cf5:74c8%5]) with mapi id 15.21.0048.013; Thu, 21 May 2026 08:33:05 +0000 From: Richard Cheng To: dave@stgolabs.ne Cc: jonathan.cameron@huawei.com, dave.jiang@intel.com, alison.schofield@intel.com, vishal.l.verma@intel.com, ira.weiny@intel.com, dan.j.williams@intel.com, fabio.m.de.francesco@linux.intel.com, rrichter@amd.com, ming.li@zohomail.com, linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, newtonl@nvidia.com, kristinc@nvidia.com, kaihengf@nvidia.com, kobak@nvidia.com, Richard Cheng Subject: [PATCH v2] cxl/test: Enforce PMD alignment for volatile mock regions Date: Thu, 21 May 2026 16:32:57 +0800 Message-ID: <20260521083257.27753-1-icheng@nvidia.com> X-Mailer: git-send-email 2.50.1 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: TPYP295CA0030.TWNP295.PROD.OUTLOOK.COM (2603:1096:7d0:a::16) To BL0PR12MB2370.namprd12.prod.outlook.com (2603:10b6:207:47::27) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL0PR12MB2370:EE_|CH2PR12MB4070:EE_ X-MS-Office365-Filtering-Correlation-Id: d10683e7-fb23-4531-a136-08deb71393dc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|366016|1800799024|18002099003|56012099003|6133799003|11063799006|3023799007; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BL0PR12MB2370.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(366016)(1800799024)(18002099003)(56012099003)(6133799003)(11063799006)(3023799007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?wwL8ac8DJzYHLrKxwvaAa72/nuIG9uwuDsmoFKo9+U4L+86kuc1MVinSt1ok?= =?us-ascii?Q?lF/oh4nH8RZ8zr05ju3lZ8cjoL+vkOxvzdIvY31096w3UFsICmMTB4Sec9Rs?= =?us-ascii?Q?eRiwNshxhpd5dOckQcf3QJOM4FRV2dCPrAGy9Z236u7oaIat2W+nvOHctCd0?= =?us-ascii?Q?4FvCIO8vDLVaG1Tuk3HkWa72OBZ72dtXvJgBKgchEcsA25jWgdtS+sHszMMF?= =?us-ascii?Q?bRWGJEaXT+2gTkQgTs+bexpiTBqZJHhdAMx6ZgwP9Z+Egf7C0Gr8LUzabSyc?= =?us-ascii?Q?KmdhuGeWv+dgMjD4GedFQuV4DqR5g3V6eYjVwkXvxpr6yFlC9UTYll1UFaMX?= =?us-ascii?Q?QYB7FmgGkf7QF84bnpEQ5c4BdciVvZ3KIXwXdVBXAe7G0BBDhTsOOp5Ixfgp?= =?us-ascii?Q?kGIA6ceYqCU6m216j8751fn1VM2ek5PKNeGb8zVbX78yikAPtwd0qzpP5X12?= =?us-ascii?Q?5VzK5P7DWisn1wohwcNgSGkJg1NsCUUKByyWV+ULxnzUstI5M/pNS5iNBvgL?= =?us-ascii?Q?2MoXofsA2993qRoZ28YHlzEcU7cecW0U5wY8p58nZ+IH2CJ0g8zQZJXUIthr?= =?us-ascii?Q?mLTWrHLItbRSSoE/0CNODp8GEyMRYrPGpGHNWS46s5McQjMpIUc8u3/b+hI/?= =?us-ascii?Q?dvP0MOZKUYz/3UbHBcd5WnhYIPgVdMYXlR8oMH5TsrfqR6SSnm251x/0crOT?= =?us-ascii?Q?fzXKaBrjRXV/s2ChFQniROCyr/Sm6Kmc3vfWG+kY1S9IvEAYkIwvmF1NY7fh?= =?us-ascii?Q?R/zk4e1NYw68CuVIW1wmdniorj6sBtjIPJFEC8vVHZBvfMjZ8G/KziJ5xvnT?= =?us-ascii?Q?sJkWRCmj/s3AH9hTMh7r5/EaXmsxYysV/FmllgEzuZBRwI4yVnKRtxXiKzPG?= =?us-ascii?Q?4qWzps/k5b1QSdVs3Zn413H8awZJJbviCP+EO0ad2++/eeeGmpK6Fny6J/oB?= =?us-ascii?Q?b7t4yW1aFKivlWKDSRxvRJ+WVPheRfUHGdVatNnn28/HOSrPNA/7OHgHd7tO?= =?us-ascii?Q?9ArP7DxaLGVMtWf1RpzhR90oSe2lQtfTMFL91MoY5Dj5ilheuzRz+InVPf5j?= =?us-ascii?Q?E8sERTtzvOKvX7QQSOc6b49cylDUqoBn4nEbANiB1Cr0o5/LGQvQ5VibpzEu?= =?us-ascii?Q?RKmnEsZIK3oIux5KgJmi5dG2+A+L2ZzuyejJ/p3ePDIhD53YQ39abtpypn2E?= =?us-ascii?Q?u5pazzTQWgrk0+O4VycNuqLs7EwIKa0v3/FAkal/htwaHE3jaJTJhiNNeDih?= =?us-ascii?Q?g1zhLe+aqt5iH9xiQWS6OQCNlbONmYirz+7VAe3JA6JXBUVJV2omzGMj9uEk?= =?us-ascii?Q?B4BV3cYDjc4B0S6Fexhsh2O3H7mAjumYG70wWXdRCCDwCfPhXxN/FqQqqOVa?= =?us-ascii?Q?1EA1H/c1iZZFlDrnfZAvCWf5d0nlwOHm5UgHqVQLQRLmOU02f2s08PrJPfmS?= =?us-ascii?Q?KSDGYUlbQ/23NrfzEc0Yx01etJekaxGRYuxR6wRpLSok39yWYpu4+sDLCdes?= =?us-ascii?Q?o9Xq5jbxE9XBfaqycQL5gesaxipVmgyZ/4w8GTQ4MQ62vKAn+DZUNZOgaCMB?= =?us-ascii?Q?4mVnfHYW3802GNcwDlOl6+CV2maB/lLHg9sWHrH6cnNHJcmCUalw9ugTZd72?= =?us-ascii?Q?ATJ2XS3In6hFnYRbYHpBRBtwiXyeaF1Qm53wLl+U07exjfRjbudsFsWU0ySz?= =?us-ascii?Q?EAdyYaKOtZ69vcUkRMjXNPDdvU498jQwSr0dexIEKxLHKJJM7dkUCZcsecE1?= =?us-ascii?Q?1Zl4HDlE+Q=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: d10683e7-fb23-4531-a136-08deb71393dc X-MS-Exchange-CrossTenant-AuthSource: BL0PR12MB2370.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 May 2026 08:33:05.0245 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 5msxX9Nq9IYAC9Ck1S3C2lRXe98vbxBVETdEYLH8z3rArLVAIBGDuXzHOrjhJ7+cg5e/JTDqHiVrgIuYJPbi7g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4070 Content-Type: text/plain; charset="utf-8" cxl_test allocates synthetic CFMWS HPA windows from a gen_pool with SZ_256M alignment. On arm64 with CONFIG_ARM64_64K_PAGES=3Dy and CONFIG_PGTABLE_LEVELS=3D3, PMD_SIZE is 512M, so every CXL region carved from a volatile window inherits a non-PMD-aligned start, and cxl_dax_region_probe() -> alloca_dax_region() fails: """ cxl_dax_region dax_region1: probe with driver cxl_dax_region failed with error -12 """ Enfore that every volatile mock CFMWS is PMD-aligned in both start and size. Reviewed-by: Dave Jiang Acked-by: Kai-Heng Feng Signed-off-by: Richard Cheng --- Changelog: v1 -> v2: - Reframe from "fix start alignment" to "enforce PMD invariant for volatile CFMWS" - Bump cfmws5.window_size to max(SZ_256M, PMD_SIZE) - Gate populate_cedt() alignment on ACPI_CEDT_CFMWS_RESTRICT_VOLATILE so PMEM windows stay at SZ_256M - Add BUILD_BUG_ON for MOCK_AUTO_REGION_SIZE_DEFAULT v.s. PMD_SIZE in cxl_test_init() v1 link: https://lore.kernel.org/r/20260519233523.5991-1-icheng@nvidia.com/ Best regards, Richard Cheng. --- tools/testing/cxl/test/cxl.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c index 418669927fb0..09c309af5fd1 100644 --- a/tools/testing/cxl/test/cxl.c +++ b/tools/testing/cxl/test/cxl.c @@ -318,7 +318,7 @@ static struct { .restrictions =3D ACPI_CEDT_CFMWS_RESTRICT_HOSTONLYMEM | ACPI_CEDT_CFMWS_RESTRICT_VOLATILE, .qtg_id =3D FAKE_QTG_ID, - .window_size =3D SZ_256M, + .window_size =3D SZ_256M > PMD_SIZE ? SZ_256M : PMD_SIZE, }, .target =3D { 3 }, }, @@ -495,9 +495,17 @@ static int populate_cedt(void) =20 for (i =3D cfmws_start; i <=3D cfmws_end; i++) { struct acpi_cedt_cfmws *window =3D mock_cfmws[i]; + int align =3D SZ_256M; =20 cfmws_elc_update(window, i); - res =3D alloc_mock_res(window->window_size, SZ_256M); + if (window->restrictions & ACPI_CEDT_CFMWS_RESTRICT_VOLATILE) + align =3D max_t(int, SZ_256M, PMD_SIZE); + res =3D alloc_mock_res(window->window_size, align); if (!res) return -ENOMEM; window->base_hpa =3D res->range.start; @@ -1826,6 +1834,8 @@ static __init int cxl_test_init(void) int rc, i; struct range mappable; =20 + BUILD_BUG_ON(!IS_ALIGNED(MOCK_AUTO_REGION_SIZE_DEFAULT, PMD_SIZE)); + cxl_acpi_test(); cxl_core_test(); cxl_mem_test(); --=20 2.43.0