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Shutemov" Cc: Andrew Morton , Mike Rapoport , David Hildenbrand , Vlastimil Babka , Mel Gorman , "Kalra, Ashish" , Rick Edgecombe , linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, Michael Roth Subject: SNP guest crash in memblock with unaccepted memory Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SA9PR13CA0003.namprd13.prod.outlook.com (2603:10b6:806:21::8) To DM4PR12MB5070.namprd12.prod.outlook.com (2603:10b6:5:389::22) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR12MB5070:EE_|MW6PR12MB8900:EE_ X-MS-Office365-Filtering-Correlation-Id: f7ffe78d-8319-49f2-6efa-08dd859c68d6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|366016|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?SmNCM090eEJQQmNIOERmT1U5VXlpR1JjQzJ1NVRyMGlxZkY1NGhiUE93NXdv?= =?utf-8?B?cU8weDAzTE8rUGx2QTNpc1M5WGlrRXdmdGhmWVpHU0VzWHBiSnJWWWplYU93?= =?utf-8?B?MVRXSWNiVlNpcUlzaHhCZ1FSRUpReHlMVVBVZFZHUWFTeXNlUnp6cThaZFJo?= =?utf-8?B?MlhJVDlVanJtUk1GdDY5OWF4SDdNMy9PY010ajlKRWkrd1Arb0JGdWRLMTYx?= =?utf-8?B?NThSVzVHQkg0c1NqMWVZd3FoQ3BOVGFxT0VPM3prREVJNmRuYmh2blJ2cG5w?= =?utf-8?B?YS9zVkt6UWlSMjlOcDRpbS8wZDFIVjlNLzNOdUxOL3lxcWtnYTlqSmNUYlVT?= =?utf-8?B?TU9TUVFMODJQSUxHVUFxOEJ3NWZkTU8zNWdIV2VVSEg5elVPVkVPMWJoRW9X?= =?utf-8?B?cXluUVRJNVdFRVFHcmxNY3JKRGhuZVZrOXJKYnptUFZNUml0QUdZUzV3SzVN?= =?utf-8?B?Y1FOMGJXdkhZWlNEc3p5YjZjbVZlbEZQV2swaG54QjVBWVF0SVFPSFo3NDAr?= =?utf-8?B?RjkzN0xLTlhKQ0JQbDhRVGRsM2ZKd21mZmNCMmJhMXVJQmdtbkhUZWFwRmNi?= =?utf-8?B?aXhNc3FuSUp1bkYvNnVRL25NNzcvNnlRcFRJaWpqdTMxVVV5RlBSUDhzU2F5?= =?utf-8?B?NzBaa1FBVUN3djcwRjM1b0Q1ZnViamRQTEpRK1Vpc083aHlBbU9PUGJhVHA3?= =?utf-8?B?VTdQUEdPNnAzeUxHK2RNdVoyaGFmblVCN0N2d0p6Njl6akFERE1ZVmJXL0dt?= =?utf-8?B?eUl6Wk5MZzBtVmUva3A1WE5rbG9DcWJMbUNRTzVnZ3NVWG5oQXlSdFRBYUF4?= =?utf-8?B?TlVjYjRWRGR2djNjR2FOVWs2aElIdDZSYTMzRXhWbVhNVTRMWmdwV09Sdkdx?= =?utf-8?B?RjZtQzl5bnBkVjZ4WGQrK1ZYUVVPdVllbmQ3S3FxTFFlYU5xcWpsUVIzYXp3?= =?utf-8?B?T0toL2k4eEw1UDVTWUwxZ3B6TWJwMjBBcit2WTBwVDN6V2pCYTVsbUxBczNZ?= =?utf-8?B?ZUFRVFh0OWRXeUU3WXNIaWtmWkR6TGpZR0dpaUN5UGJiZTdGeldjRXZ5Q3hG?= =?utf-8?B?Nm05RnhiUGI4bGhxVXN6aFN0Y3F3TG9QcTIxajJXMnFqbmlRMGRMMHljRUIw?= =?utf-8?B?bm5rVU1jdStjbnFaTHplVGxXWS9NaURyTWJIaWZkbG9NSmY3WUJuSko3UjQv?= =?utf-8?B?bU42YlpEb0hOOCtWbTJMNDZNRGN2MUtZUDV5eEwyMzBiMzZqNHFMYVJXbHp4?= =?utf-8?B?MlZJbmUyWGJFd080WFVoenlQdUtJeFluNXZWeDFRejQrdEdlOVl3Ky8zTE1s?= =?utf-8?B?bVRrODgwOWttTXNwZlc3MDIzOHhJV3pPVyt4b1F0ZzRyR09lQ3FxOGdIdU92?= =?utf-8?B?ci9UKytsMHlmVmVzTWdaT1NmR2gzQk5CTDB1TnRFTEpyd0I0NlRJKzJhZTJ4?= =?utf-8?B?WC9HcEwwTitPODhaMEtSY0VmeW1zZjRvb0NOaDhVQ1FuUnlFZEJ6NmdrOE1U?= =?utf-8?B?WWZBeTJLeHVtN3pxZEpGTm5INk1UWG0valNHRG9SWnFjQWZIV3VPY3QySm0z?= =?utf-8?B?b2wwNFl2VFprbUg3RXNlOVAwK1lkMWtHaUVEc2FHY0hzOTBIZzNEOHVYeFY4?= =?utf-8?B?bUovQ3BLL0hXR0duNk94aTJEaDIxb0ZKWGpaRTdrQ3ZOQVNvR2hSUXJaeWRu?= =?utf-8?B?dU9veUcvcVQ1L2ZYUTI0aHZvRUxsM2tOWG5CKytLT2EyWThGOWtBdHdnNVpp?= =?utf-8?B?ak1nVFdsMm1QQzNaQStVUXFXR3d6Y3NxUlVmME9tdjBHajVUQVJCbXB3NVdG?= =?utf-8?B?anA5b1RNNVp6cm9kS2RQK3V0SUtBZVR0cWJTSUV0a2RkK3Z2My9MTGo3UmZs?= =?utf-8?B?cWF6TmJLbVdUTWhoZmtZcVR2SkN0cEJZMUhINkd4LzE5dDFOb3JacC94OElp?= =?utf-8?Q?mIWHdAvXYrI=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM4PR12MB5070.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(366016)(376014)(1800799024);DIR:OUT;SFP:1101; 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I managed to get a back trace: RIP: 0010:memcpy_orig+0x68/0x130 Code: ... RSP: 0000:ffffffff9cc03ce8 EFLAGS: 00010006 RAX: ff11001ff83e5000 RBX: 0000000000000000 RCX: fffffffffffff000 RDX: 0000000000000bc0 RSI: ffffffff9dba8860 RDI: ff11001ff83e5c00 RBP: 0000000000002000 R08: 0000000000000000 R09: 0000000000002000 R10: 000000207fffe000 R11: 0000040000000000 R12: ffffffff9d06ef78 R13: ff11001ff83e5000 R14: ffffffff9dba7c60 R15: 0000000000000c00 memblock_double_array+0xff/0x310 memblock_add_range+0x1fb/0x2f0 memblock_reserve+0x4f/0xa0 memblock_alloc_range_nid+0xac/0x130 memblock_alloc_internal+0x53/0xc0 memblock_alloc_try_nid+0x3d/0xa0 swiotlb_init_remap+0x149/0x2f0 mem_init+0xb/0xb0 mm_core_init+0x8f/0x350 start_kernel+0x17e/0x5d0 x86_64_start_reservations+0x14/0x30 x86_64_start_kernel+0x92/0xa0 secondary_startup_64_no_verify+0x194/0x19b I don't know a lot about memblock, but it appears that it needs to allocate more memory for it's regions array and returns a range of memory that hasn't been accepted. When the memcpy() runs, the SNP guest gets a #VC 0x404 because of this. Do you think it is as simple as calling accept_memory() on the memory range returned from memblock_find_in_range() in memblock_double_array()? Thanks, Tom