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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 BY1PEPF0001AE18.mail.protection.outlook.com (10.167.242.100) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.592.5 via Frontend Transport; Fri, 30 Oct 2026 21:04:28 +0000 Received: from [192.168.86.104] (10.180.168.240) 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 15.2.2562.53; Fri, 30 Oct 2026 16:04:27 -0500 Message-ID: <715b5f44-2f0f-4c96-886e-a78d57ee17f0@amd.com> Date: Fri, 30 Oct 2026 16:04:27 -0500 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: "Cheatham, Benjamin" Subject: Re: [PATCH 0/4] PCI/CXL: Guard reset recovery against inaccessible devices To: Richard Cheng , , , , , , CC: , , , , , , , References: <20260929020405.9724-1-icheng@nvidia.com> Content-Language: en-US In-Reply-To: <20260929020405.9724-1-icheng@nvidia.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY1PEPF0001AE18:EE_|SA1PR12MB6704:EE_ X-MS-Office365-Filtering-Correlation-Id: 606ae44a-50e9-491b-4728-08df36c96305 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|7416014|23010399003|376014|1800799024|6133799003|22082099003|18002099003|56012099006|11063799006|261021121427099003|261028144727099003|261026121527099003|261026140227099003|10067099003|261022075727099003|261021123027099003|261022105027099003|261009223027099003; X-Microsoft-Antispam-Message-Info: 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 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)(36860700016)(82310400026)(7416014)(23010399003)(376014)(1800799024)(6133799003)(22082099003)(18002099003)(56012099006)(11063799006)(261021121427099003)(261028144727099003)(261026121527099003)(261026140227099003)(10067099003)(261022075727099003)(261021123027099003)(261022105027099003)(261009223027099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: HTgH3sffimiBvcNbAAJloC8wCE6ubtpyvh7r2AyOWR7McHziXl+KegmICQ7BTSYemwfl9ZBYn1MUMcL2kxnd1LloeF4mx9I8MODrjEBMCvPytxFTNDIRx6Exb/vleXYPnpZ+SPtcuRcUveLJzvoTsTKc6rm9Cvnyq9zIbl8BvTY71b/B5r9nGwbGrvrMf1JplBqhxwzZTXrb64nlyG7n8NIF9H0p3DtAad0QCcCpW+Rc7HksEmcHoj3f1wMi7GXlCo+OY+XumHIT0mOlssCKmJRRxWmAeokLRZWNAvJTtKHAJzEL8NkPmtREvyBFXDCOzL0wTDrn85uVFw0PE1UqS78beqHlOOMUyGvLY7iUmxhKfQvdUwPcAShIvTshhaBtWXJIzsSt3iEE0h9aTSrQjpANOjcl1TEUGYYZDPfDevkxW3ZEsJibGCjIgiI8VwAG X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2026 21:04:28.6740 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 606ae44a-50e9-491b-4728-08df36c96305 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: BY1PEPF0001AE18.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB6704 I noticed that linux-pci isn't CC'ed. Seems like a big oversight considering 3/4 of the patches are in the PCI code... I'd resend to this with that list in the CC, or at least include it in a v2. Thanks, Ben On 9/28/2026 9:04 PM, Richard Cheng wrote: > During FLR testing, PCI configuration reads returned all ones. The > kernel could mistake this for reset completion and proceed with MSI-X > restoration. The resulting MMIO access triggered DPC containment. > > This series addresses four issues: > > 1. Reject all-ones responses in pci_dev_wait(). Use Command-register > polling for VFs, whose Vendor ID legitimately reads as all ones. > > 2. Return -ETIMEDOUT when readiness polling expires, preventing fallback > to another reset method. > > 3. Check configuration accessibility before restoring PCI state, while > preserving driver reset callbacks. > > 4. Skip CXL decoder MMIO accesses when configuration is inaccessible > or memory decoding is disabled. > > > Best regards, > Richard Cheng. > > Richard Cheng (4): > PCI: Reject all-ones responses in pci_dev_wait() > PCI: Return -ETIMEOUT when reset readiness polling expires > PCI: Skip state restoration when configuration is inaccessible > cxl/pci: Guard decoder accesses after reset > > drivers/cxl/pci.c | 6 ++++++ > drivers/pci/pci.c | 16 +++++++++------- > 2 files changed, 15 insertions(+), 7 deletions(-) > > > base-commit: 9eb6419022d81aac6d1d9ead0e1865b451153da5