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[85.23.51.1]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b2e23c46c4sm2311351e87.17.2026.08.03.21.27.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 21:27:26 -0700 (PDT) From: mpenttil@redhat.com To: linux-mm@kvack.org Cc: dri-devel@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Mika=20Penttil=C3=A4?= , David Hildenbrand , Jason Gunthorpe , Leon Romanovsky , Alistair Popple , Balbir Singh , Zi Yan , Matthew Brost , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko Subject: [PATCH v13 08/11] mm/hmm: add lazy MMU mode support for migration in HMM pagewalk Date: Tue, 4 Aug 2026 07:26:28 +0300 Message-ID: <20260804042631.2175585-9-mpenttil@redhat.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260804042631.2175585-1-mpenttil@redhat.com> References: <20260804042631.2175585-1-mpenttil@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: Z3JEhQH1wNFpA0bq3PJVaFlArC5Xzd4FFkrCMVOciOg_1785817649 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Rspam-User: X-Stat-Signature: o6crurnhtqsa8zjzipfq4b497yfxji3p X-Rspamd-Queue-Id: A24B940008 X-HE-Tag: 1785817652-426811 X-HE-Meta: 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 rbZrkFrK Wxe+Lldqdv/II6Rdm3h4m++67hGffHH3P2nCNLiAc48Mi2v6u6kQlwXiAM+csOuOsqa/7AU1N8DZk6lXxJxVCwJeJ+zELsANW/tARuXmlD+o6TI/kqIs5lY6LeJkjr6+5auntiE+jBbaj52IeyXo9e44dWGUSjlKCQDPQX/idB8uKJpxQxBuR/QUED9nSo7WnqCSSsEYci/k1vCpCFKgsVreN7a1+fuB66h8aEDHskJjOokyYq8XKyehYe1Bf6UrhiBqWgUF7SyTsWv3AIP+XTs08sAmoaSVqNhzbETRKsqbMBNThdYRe809xWwqF7vhlXkf3+USSe0Q2100igruQ7BLDYXtNDFUxBZw6WCWAtHO7py77bPoK59PzBaepqlJKs5lKzlTweCd7zh1ZfEyeTwfzJCscvw+3fS6IiGhX0nzMlrlYGnztrNR2y5YP7zbk56K53MrNf+v65/DwbvwwU3j5RkXewqPFQdJ/XbzoYBRe3NQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Mika Penttilä Add calls to lazy_mmu_mode_enable() and lazy_mmu_mode_disable() while doing migration. Cc: David Hildenbrand Cc: Jason Gunthorpe Cc: Leon Romanovsky Cc: Alistair Popple Cc: Balbir Singh Cc: Zi Yan Cc: Matthew Brost Suggested-by: Alistair Popple Signed-off-by: Mika Penttilä --- mm/hmm.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/mm/hmm.c b/mm/hmm.c index 61b9147fd8ed..631f6b4d52fc 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -368,6 +368,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr, /* Report error for everything else */ if (hmm_vma_walk->ptelocked) { + lazy_mmu_mode_disable(); pte_unmap_unlock(ptep, hmm_vma_walk->ptl); hmm_vma_walk->ptelocked = false; } else { @@ -391,6 +392,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr, !is_zero_pfn(pte_pfn(pte))) { if (hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0)) { if (hmm_vma_walk->ptelocked) { + lazy_mmu_mode_disable(); pte_unmap_unlock(ptep, hmm_vma_walk->ptl); hmm_vma_walk->ptelocked = false; } else { @@ -410,6 +412,7 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr, fault: if (hmm_vma_walk->ptelocked) { + lazy_mmu_mode_disable(); pte_unmap_unlock(ptep, hmm_vma_walk->ptl); hmm_vma_walk->ptelocked = false; } else { @@ -507,6 +510,7 @@ static int migrate_vma_split_folio(struct folio *folio, if (folio != fault_folio) folio_get(folio); + lazy_mmu_mode_disable(); pte_unmap_unlock(ptep, hmm_vma_walk->ptl); hmm_vma_walk->ptelocked = false; @@ -1132,8 +1136,10 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp, if (minfo) { ptep = pte_offset_map_lock(mm, pmdp, addr, &hmm_vma_walk->ptl); - if (ptep) + if (ptep) { + lazy_mmu_mode_enable(); hmm_vma_walk->ptelocked = true; + } } else { ptep = pte_offset_map(pmdp, addr); } @@ -1169,6 +1175,7 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp, flush_tlb_range(walk->vma, start, addr); if (hmm_vma_walk->ptelocked) { + lazy_mmu_mode_disable(); pte_unmap_unlock(ptep - 1, hmm_vma_walk->ptl); hmm_vma_walk->ptelocked = false; } else { -- 2.55.0