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Mon, 9 Dec 2024 03:05:12 +0000 Message-ID: <4f7ca7af-5c5e-4d00-add6-47625f38c8e3@intel.com> Date: Mon, 9 Dec 2024 11:10:10 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] iommu/vt-d: Fix qi_batch NULL pointer with nested parent domain To: Baolu Lu , , CC: , References: <20241207120304.5710-1-yi.l.liu@intel.com> Content-Language: en-US From: Yi Liu In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI2PR02CA0006.apcprd02.prod.outlook.com (2603:1096:4:194::8) To DS0PR11MB7529.namprd11.prod.outlook.com (2603:10b6:8:141::20) Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7529:EE_|DM6PR11MB4561:EE_ X-MS-Office365-Filtering-Correlation-Id: b1fb0fac-d1f7-4a23-e1fc-08dd17fe4bbc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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While >> for nested parent domain, it is missed. Hence, when trying to map pages >> to the nested parent, NULL dereference occurred. > > Strip the kernel message and leave only valuable messages that > developers might be interested. Something like this, got it. >  BUG: kernel NULL pointer dereference, address: 0000000000000200 >  #PF: supervisor read access in kernel mode >  #PF: error_code(0x0000) - not-present page >  PGD 8104795067 P4D 0 >  Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI >  CPU: 223 UID: 0 PID: 4357 Comm: qemu-system-x86 Not tainted > 6.13.0-rc1-00028-g4b50c3c3b998-dirty #2632 >  Call Trace: >   ? __die+0x24/0x70 >   ? page_fault_oops+0x80/0x150 >   ? do_user_addr_fault+0x63/0x7b0 >   ? exc_page_fault+0x7c/0x220 >   ? asm_exc_page_fault+0x26/0x30 >   ? cache_tag_flush_range_np+0x13c/0x260 >   intel_iommu_iotlb_sync_map+0x1a/0x30 >   iommu_map+0x61/0xf0 >   batch_to_domain+0x188/0x250 >   iopt_area_fill_domains+0x125/0x320 >   ? rcu_is_watching+0x11/0x50 >   iopt_map_pages+0x63/0x100 >   iopt_map_common.isra.0+0xa7/0x190 >   iopt_map_user_pages+0x6a/0x80 >   iommufd_ioas_map+0xcd/0x1d0 >   iommufd_fops_ioctl+0x118/0x1c0 >   __x64_sys_ioctl+0x93/0xc0 >   do_syscall_64+0x71/0x140 >   entry_SYSCALL_64_after_hwframe+0x76/0x7e > > -- Regards, Yi Liu