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[89.27.86.246]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e25828e72sm3174366f8f.26.2026.10.20.23.30.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 20 Oct 2026 23:30:51 -0700 (PDT) Message-ID: <7b534ff3-699a-4c38-b6d5-b044383d956e@redhat.com> Date: Wed, 21 Oct 2026 09:30:49 +0300 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v16 09/12] mm: enable device page migration from HMM pagewalk To: Balbir Singh , linux-mm@kvack.org Cc: dri-devel@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-kernel@vger.kernel.org, David Hildenbrand , Jason Gunthorpe , Leon Romanovsky , Alistair Popple , Zi Yan , Matthew Brost , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Lyude Paul , Danilo Krummrich References: <20261021060506.2377545-1-mpenttil@redhat.com> <20261021060506.2377545-10-mpenttil@redhat.com> <7c8c663f-cf31-40ff-bce4-784726f42a0b@nvidia.com> From: =?UTF-8?Q?Mika_Penttil=C3=A4?= In-Reply-To: <7c8c663f-cf31-40ff-bce4-784726f42a0b@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: -3bfB1Whx5-yImeYORX4x2kO-_WS2iS2XXiGk6kYjnI_1792564253 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: CA4B540002 X-Stat-Signature: sinjtag7w5jg184ig5q3dmh8rx4y1rd3 X-Spam-Status: No, score=-17.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1792564255-88034 X-HE-Meta: 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 zL8ssIsC 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 10/21/26 09:19, Balbir Singh wrote: > On 10/21/26 5:05 PM, mpenttil@redhat.com wrote: >> From: Mika Penttilä >> >> HMM pagewalk has now the machinery to do the first phase of >> device page migration, collecting the pfns and installing >> migration ptes. >> >> Enable migration in hmm_range_fault(), and change migrate_vma_setup() >> to use HMM pagewalk path. Two new flags, MIGRATE_VMA_FAULT and >> MIGRATE_VMA_WRITE are introduced for migrate_vma_setup(), >> to request for faulting missing pages, and requesting write >> access. >> >> Also, the migrate_vma_collect*() based paths are now unused, >> so delete them. >> >> 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 >> --- >> include/linux/migrate.h | 10 +- >> mm/hmm.c | 33 ++- >> mm/migrate_device.c | 562 ++++------------------------------------ >> 3 files changed, 83 insertions(+), 522 deletions(-) >> > I got a conflict applying this patch on the latest mm-everything with > mm: avoid use of VMA_SPECIAL_FLAGS in migrate_vma_setup(), quite a simple fixup > > Balbir Ah okay - yes this is on drm-tip --Mika