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b=uVqayyQGJ70Bznw2I5YiA8ViVHXsm/EAgoopPZW287UGLEzFt9ywGCSBY2kfONjzf9PXB3jzXWt+u3sR54WxhaO+OjNkVgyiOu2aZSBazF4NZdtmG+Rc6DbXmhLSCpay9EF/e8OHB/iVVZamrQvSBGkYrgro8RxhBTtIr5tG7BUyLqxdZ/HWpc/1O518Syuj/EP6xdBS0Bfj56OyAWLnwf0clcgqyG3IeiYPhu0nC+1p4AHUcbqvg1vhna0hlsqZ1Aty2CovMEnXT+UwoNe5gePsk48yTiFNzWLPbFrMtJAzx2r1ZOKILxFtfFj+l2x+WJSDDL8ojsbNpCXLck1eDA== Received: from DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) by PH7PR12MB5806.namprd12.prod.outlook.com (2603:10b6:510:1d2::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9564.7; Tue, 27 Jan 2026 21:01:21 +0000 Received: from DS7PR12MB9473.namprd12.prod.outlook.com ([fe80::f01d:73d2:2dda:c7b2]) by DS7PR12MB9473.namprd12.prod.outlook.com ([fe80::f01d:73d2:2dda:c7b2%4]) with mapi id 15.20.9542.010; Tue, 27 Jan 2026 21:01:21 +0000 From: Zi Yan To: Jordan Niethe Cc: linux-mm@kvack.org, balbirs@nvidia.com, matthew.brost@intel.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, david@redhat.com, apopple@nvidia.com, lorenzo.stoakes@oracle.com, lyude@redhat.com, dakr@kernel.org, airlied@gmail.com, simona@ffwll.ch, rcampbell@nvidia.com, mpenttil@redhat.com, jgg@nvidia.com, willy@infradead.org, linuxppc-dev@lists.ozlabs.org, intel-xe@lists.freedesktop.org, jgg@ziepe.ca, Felix.Kuehling@amd.com, jhubbard@nvidia.com Subject: Re: [PATCH v3 05/13] mm/page_vma_mapped: Add flag to page_vma_mapped_walk::flags to track device private pages Date: Tue, 27 Jan 2026 16:01:15 -0500 X-Mailer: MailMate (2.0r6290) Message-ID: <7AEEAEF2-5876-4EF4-B79C-D95E4E637A89@nvidia.com> In-Reply-To: <20260123062309.23090-6-jniethe@nvidia.com> References: <20260123062309.23090-1-jniethe@nvidia.com> <20260123062309.23090-6-jniethe@nvidia.com> Content-Type: text/plain X-ClientProxiedBy: SJ0PR13CA0177.namprd13.prod.outlook.com (2603:10b6:a03:2c7::32) To DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB9473:EE_|PH7PR12MB5806:EE_ X-MS-Office365-Filtering-Correlation-Id: b1ae36ba-40a8-4f37-526a-08de5de7392c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014; 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This will mean that device private pages no longer have > normal PFN and must be handled separately. > > Prepare for this by adding a PVMW_DEVICE_PRIVATE flag to > page_vma_mapped_walk::flags. This indicates that > page_vma_mapped_walk::pfn contains a device private offset rather than a > normal pfn. > > Once the device private pages are removed from the physical address > space this flag will be used to ensure a device private offset is > returned. > > Signed-off-by: Jordan Niethe > Signed-off-by: Alistair Popple > --- > v1: > - Update for HMM huge page support > v2: > - Move adding device_private param to check_pmd() until final patch > v3: > - Track device private offset in pvmw::flags instead of pvmw::pfn > --- > include/linux/rmap.h | 24 ++++++++++++++++++++++-- > mm/page_vma_mapped.c | 4 ++-- > mm/rmap.c | 4 ++-- > mm/vmscan.c | 2 +- > 4 files changed, 27 insertions(+), 7 deletions(-) > LGTM. Reviewed-by: Zi Yan Best Regards, Yan, Zi