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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ1PEPF00002314.mail.protection.outlook.com (10.167.242.168) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.181.6 via Frontend Transport; Wed, 1 Jul 2026 14:45:44 +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 15.2.2562.41; Wed, 1 Jul 2026 09:45:43 -0500 Received: from pankaj-M75q.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server id 15.2.2562.41 via Frontend Transport; Wed, 1 Jul 2026 09:45:43 -0500 From: Pankaj Gupta To: , , , , CC: , , , , , , , , , Subject: [PATCH] KVM: SEV: drop FOLL_LONGTERM for encrypted region registration Date: Wed, 1 Jul 2026 09:45:43 -0500 Message-ID: <20260701144543.39582-1-pankaj.gupta@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002314:EE_|CH1PR12MB9693:EE_ X-MS-Office365-Filtering-Correlation-Id: e6863833-e859-4f80-7ada-08ded77f6e59 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|82310400026|1800799024|36860700016|23010399003|18002099003|11063799006|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: unIlfKaedUozbHK+qKHZD9qjJHvv4dSVqjc4ei43WzPyu8jl0FchDNryHwHGKgThEWHukhyBpBg0DSCRwnbBnv/7EwIUusj3GLQykKqKQXlAg5lyMB/5xFhqHB4oG+q8yv9gRCC9K9bEHmrHRbdmyorhZBzILDEm+hCWUn/ODo/PG8iz3u5VxJ2WeH5rxYSQUNPNvbN4o8sS+Pr3FRVXHd2YP10kMdVBDIpalkyBdLg/omQcTnVP29DRiJtVbXrSHjwdBcZ/GansT98tsiUQrDXcz10uEjNy/xw93D+ckDJgnw3Qb7SU08np0U2axQDKT0/TIs4RlFFFQjU5vuzqWBESQd5DtQ7t785wU1VJGRX5cJj3Wgjx6i2/dTPDT5RS0w/41V0Du/BcSOY5vWgvFZk5ck1OVttPAw/9a3dWqJduV1Sb6VHQoBhaIvMLwb4w X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2026 14:45:44.4347 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e6863833-e859-4f80-7ada-08ded77f6e59 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: SJ1PEPF00002314.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH1PR12MB9693 commit 7e066cb9b71a ("KVM: SEV: Use long-term pin when registering encrypted memory regions") added FOLL_LONGTERM to sev_mem_enc_register_region() so anonymous guest RAM is migrated out of MIGRATE_CMA/ZONE_MOVABLE before a long term pin. This breaks virtio-pmem which has file backed (MAP_SHARED) host mapping where GUP rejects FOLL_WRITE | FOLL_LONGTERM since: commit 8ac268436e6d ("mm/gup: disallow FOLL_LONGTERM GUP-nonfast writing to file-backed mappings") commit a6e79df92e4a ("mm/gup: disallow FOLL_LONGTERM GUP-fast writing to file-backed mappings"). Drop FOLL_LONGTERM when registering encrypted memory regions and restore the previous behavior. Fixes: 7e066cb9b71a ("KVM: SEV: Use long-term pin when registering encrypted memory regions") Cc: stable@vger.kernel.org Signed-off-by: Pankaj Gupta --- arch/x86/kvm/svm/sev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 6c6a6d663e29..c4b53700f69e 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2764,7 +2764,7 @@ int sev_mem_enc_register_region(struct kvm *kvm, return -ENOMEM; region->pages = sev_pin_memory(kvm, range->addr, range->size, ®ion->npages, - FOLL_WRITE | FOLL_LONGTERM); + FOLL_WRITE); if (IS_ERR(region->pages)) { ret = PTR_ERR(region->pages); goto e_free; -- 2.34.1