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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang Subject: [PATCH] mm/huge_memory: softleaf device private fixes in remove_migration_pmd() Date: Wed, 12 Nov 2025 15:46:34 +1100 Message-ID: <20251112044634.963360-2-balbirs@nvidia.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251112044634.963360-1-balbirs@nvidia.com> References: <20251112044634.963360-1-balbirs@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SY5PR01CA0115.ausprd01.prod.outlook.com (2603:10c6:10:246::7) To PH8PR12MB7277.namprd12.prod.outlook.com (2603:10b6:510:223::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR12MB7277:EE_|MN0PR12MB6175:EE_ X-MS-Office365-Filtering-Correlation-Id: 1e531c46-f55b-4fbc-050d-08de21a680cd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|10070799003|376014|7416014; X-Microsoft-Antispam-Message-Info: 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softleaf_is_migration_young() asserts that the entry be a migration entry, but in the current code, the entry might already be replaced by a device private entry by the time the check is made. The issue exists with commit 7385dbdbf841 ("mm/rmap: extend rmap and migration support device-private entries") Fix this by processing the migration entries prior to conversion to device private if the folio is device private. Cc: Andrew Morton Cc: David Hildenbrand Cc: Lorenzo Stoakes Cc: Zi Yan Cc: Baolin Wang Cc: "Liam R. Howlett" Cc: Nico Pache Cc: Ryan Roberts Cc: Dev Jain Cc: Barry Song Cc: Lance Yang Signed-off-by: Balbir Singh --- mm/huge_memory.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 942bd8410c54..82b019205216 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -4939,6 +4939,7 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new) unsigned long haddr = address & HPAGE_PMD_MASK; pmd_t pmde; softleaf_t entry; + bool old = false, dirty = false, migration_read_entry = false; if (!(pvmw->pmd && !pvmw->pte)) return; @@ -4947,6 +4948,19 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new) folio_get(folio); pmde = folio_mk_pmd(folio, READ_ONCE(vma->vm_page_prot)); + if (!softleaf_is_migration_young(entry)) + old = true; + + /* NOTE: this may contain setting soft-dirty on some archs */ + if (folio_test_dirty(folio) && softleaf_is_migration_dirty(entry)) + dirty = true; + + if (softleaf_is_migration_write(entry)) + pmde = pmd_mkwrite(pmde, vma); + + if (!softleaf_is_migration_read(entry)) + migration_read_entry = true; + if (folio_is_device_private(folio)) { if (pmd_write(pmde)) entry = make_writable_device_private_entry( @@ -4959,20 +4973,17 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new) if (pmd_swp_soft_dirty(*pvmw->pmd)) pmde = pmd_mksoft_dirty(pmde); - if (softleaf_is_migration_write(entry)) - pmde = pmd_mkwrite(pmde, vma); + if (old) + pmde = pmd_mkold(pmde); if (pmd_swp_uffd_wp(*pvmw->pmd)) pmde = pmd_mkuffd_wp(pmde); - if (!softleaf_is_migration_young(entry)) - pmde = pmd_mkold(pmde); - /* NOTE: this may contain setting soft-dirty on some archs */ - if (folio_test_dirty(folio) && softleaf_is_migration_dirty(entry)) + if (dirty) pmde = pmd_mkdirty(pmde); if (folio_test_anon(folio)) { rmap_t rmap_flags = RMAP_NONE; - if (!softleaf_is_migration_read(entry)) + if (migration_read_entry) rmap_flags |= RMAP_EXCLUSIVE; folio_add_anon_rmap_pmd(folio, new, vma, haddr, rmap_flags); -- 2.51.1