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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=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CY4PEPF0000C966.mail.protection.outlook.com (10.167.241.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6134.14 via Frontend Transport; Mon, 20 Feb 2023 18:46:41 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Mon, 20 Feb 2023 12:46:40 -0600 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Hugh Dickins Subject: [PATCH RFC v8 18/56] x86/fault: fix handle_split_page_fault() to work with memfd backed pages Date: Mon, 20 Feb 2023 12:38:09 -0600 Message-ID: <20230220183847.59159-19-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230220183847.59159-1-michael.roth@amd.com> References: <20230220183847.59159-1-michael.roth@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000C966:EE_|DM4PR12MB5264:EE_ X-MS-Office365-Filtering-Correlation-Id: ba5fa676-5082-4d16-0e82-08db1372ce65 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2023 18:46:41.1892 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ba5fa676-5082-4d16-0e82-08db1372ce65 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000C966.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5264 X-Stat-Signature: brb9umby6hyrfiwdfz4srp1nxqakrxk8 X-Rspam-User: X-Rspamd-Queue-Id: 8F08BA0006 X-Rspamd-Server: rspam06 X-HE-Tag: 1676918803-168809 X-HE-Meta: U2FsdGVkX19Qm0ejBjY27CMln8nAXL+dsNhcnBH5fUCqhVDU25dcgMBmlMT0XuVhwFxDFlbmXDAsVdjBWzjwkM9JvXuCy6jpNVdky9vZW0yxLn+Ix1EJunYDjzZVGD/9h4/t9sx98hjJVXorOB1B1QBn8vX4E4VdM7pGQAAYD3wX0XI92TCCwMkmGQMS/5WQ0Mc6343UUz9Nfx6oSQQmfwzACmQk0tGq4WB5dcwRGBuzG2De1bw9qEa9OGOmcet4eZdP+8MeYJcZFncgbd9YnNxUNn5+BGT7qnBgTiVycsicuMGOHhjfTmrmqWO4BByxnP7FqB6CSJMeokzr86hriTlnVmq6ipdYS/2Ekl9Gfg0znZ9CDR4tMnb7LhfwIm6mt1Bgp4ry2UPhowz579J8SlGnc64Bx18273tXYrBlzTlyNe3MmHA5s9OH6ic9eCBbK2AfRY7J2zyqzCnH6W13WGYhNuskzse/0x+0UG+lGZ11jP2syjiOCO7T8dyYBRrBkIjA4xBkzWy6FHUp0QL/2YzczOJvdtUos2jFw+Z8S1g11R79Md7hYO4UB1uFJuMGZH3mxa8DYQ6N2pgJ0Szq70CAIod97IY3+ID72bKRyHJMN2yZsBWLhvzUmLET2CAFWUun33t4jT+jFqD8LvNKw77CscVWf7K6lU+u+fh0DTFOEUfiYa8eBGm3+WftISGendS9nsCzWVVCzZAZA+b8l+2Og7q4Qz1QGEa9AJqNWNE4qjdrMAH84rBO2MUZI+snSAxWhkCTbUVkRjCPuSdlKsM+GZB3cKLj3D3A7oGE7/oxq+Fn3ZMta26UPY3r0i6xF2P/DcMD7RmW2qvhGbl/KrRTct7VZZbn/3VYSgNnlEXGB1CjmQFhOI/ryvugSAk1lNE37GKGyvH254i6pgBpqYgjySHC1vNXh3i9P2n0aV4kEwCdEq7VtuB5fbxhE05LT0m6TGPZZeRL/kKXv+B HOn8SKV/ /dBTPsKvchRWQ3lfw1lvws8Mrnp3goFwZFVwfS/y0dCpAhOJtWGOQSQgrulJGy0IxD3Z+V/5NktA6kZkx6L6YFNaHu2SJuTpAlkGmHGKtj2QcVlNzMjYuwxlhgMZAymMxgwLOWhLpF9oR+L8jeEblHsbLazowStRHOpwMDuZMZMtH4klTCq3VoN8Khqhyq/9czE4xIC7nal/S34P+gmOYvZ0xFHgpqdsYI/eB6JS4BLuOaSUuHIWjYuoGdm4GRMCa3bRcRsU0KKzQfqU4UuynuKJ9bSIeTkNL8aLL4e2nwi9mLd4++N+U/Enpbhb1q3k4sdUqIMG9+8T3vs3EWeVyKurXLpPILzxot6QRqr5O5vV6VzLOUIjWTmSE6zYTv8L0cW6jVNY5RCy78uU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Hugh Dickins When the address is backed by a memfd, the code to split the page does nothing more than remove the PMD from the page tables. So immediately install a PTE to ensure that any other pages in that 2MB region are brought back as in 4K pages. Signed-off-by: Hugh Dickins Cc: Hugh Dickins Signed-off-by: Ashish Kalra Signed-off-by: Michael Roth --- mm/memory.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index e68da7e403c6..33c9020ba1f8 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4999,6 +4999,11 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf) static int handle_split_page_fault(struct vm_fault *vmf) { __split_huge_pmd(vmf->vma, vmf->pmd, vmf->address, false, NULL); + /* + * Install a PTE immediately to ensure that any other pages in + * this 2MB region are brought back in as 4K pages. + */ + __pte_alloc(vmf->vma->vm_mm, vmf->pmd); return 0; } -- 2.25.1