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[85.23.51.1]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5a4187e7ad0sm6197416e87.58.2026.04.24.14.28.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Apr 2026 14:28:52 -0700 (PDT) Message-ID: <55de9b82-5a16-4d4f-8729-db7f2ccfa0eb@redhat.com> Date: Sat, 25 Apr 2026 00:28:47 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 0/5] Migrate on fault for device pages To: Matthew Brost Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, David Hildenbrand , Jason Gunthorpe , Leon Romanovsky , Alistair Popple , Balbir Singh , Zi Yan , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko References: <20260414041226.1539439-1-mpenttil@redhat.com> <20260424092336.7f8f5b0c00f4b46f9e0879d9@linux-foundation.org> <3faef07e-5093-4d9f-bb1f-e9a1f2dc6100@redhat.com> From: =?UTF-8?Q?Mika_Penttil=C3=A4?= In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 1wzVcPtk5l-p0QZ71ro1lFIAqSS2Q4DqMZqehR-odrU_1777066138 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 8210AA0002 X-Rspamd-Server: rspam06 X-Stat-Signature: aqqsqbre7mco5kf7z43waszssjhuj974 X-HE-Tag: 1777066141-596522 X-HE-Meta: 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 HrkzvdSx oKViE3lhTgserGCrNncCkdIjU9f9bb1Ta3HBL50kRZ2hPJ9zfDcwQZ1Yter5ZgRdl8R8YEr3zybVc7FaaxreHpPxBeVoW1ruBZ4Jzt/ktbFD9I6mWo5WhSv8ZkzTdZ/mKVfKTmdk/RSECLTBblj4tz6CQx5855tiNWlK/7JEQBC1MUS1HuIhpmBaJwa+T8UeYQgMgy2O8NggBvwrh0GX+KBO04g9jcLYlz4vdVBt0OEEXYigbyy1VALsB5gaXV/h2MYuskMfEGkckkBwfaZtsYn6q4MPvvr3tCWkbZGOko3Opb9SV4kW2tfGTUmgPPU87x5qlUgP4Wx/JjPjIsCEyGcBjajoQudh8VKFl/+arkD8Wx1Gzs0Y5WvyEnS4lyAFoewEPYjEdK4VutVD9YrmT1RZsghwoMY6vc7jAaOHBTn9ewe6/AiwG+Od+tr926458JZXt29MfPkdISsx4DaGfaNO7Qw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/25/26 00:23, Matthew Brost wrote: > On Fri, Apr 24, 2026 at 07:50:37PM +0300, Mika Penttilä wrote: >> On 4/24/26 19:23, Andrew Morton wrote: >> >>> On Tue, 14 Apr 2026 07:12:21 +0300 mpenttil@redhat.com wrote: >>> >>>> From: Mika Penttilä >>>> >>>> Currently, the way device page faulting and migration works >>>> is not optimal, if you want to do both fault handling and >>>> migration at once. >>>> >>>> Being able to migrate not present pages (or pages mapped with incorrect >>>> permissions, eg. COW) to the GPU requires doing either of the >>>> following sequences: >>>> >>>> ... >>>> >>> Via which tree would it be best to upstream this? >>> >>>> include/linux/hmm.h | 19 +- >>>> include/linux/migrate.h | 26 +- >>>> lib/test_hmm.c | 101 ++- >>>> lib/test_hmm_uapi.h | 19 +- >>>> mm/Kconfig | 2 + >>>> mm/hmm.c | 821 +++++++++++++++++++++++-- >>>> mm/migrate_device.c | 589 +++--------------- >>>> tools/testing/selftests/mm/hmm-tests.c | 54 ++ >>>> 8 files changed, 1053 insertions(+), 578 deletions(-) >>> Looks like mm.git. >>> >>> It might be more useful to add it to a DRM tree if there's ongoing >>> development against this. But please no upstreaming without good >>> review! >>> >>> Anyway, this is a bit dated and Sashiko AI review wasn't able to apply >>> the patches. Nor was it able to apply v7 or v6. So please refresh, >>> retest, resend? >> It is against Linus tree v7.0, base-commit: 028ef9c96e96197026887c0f092424679298aae8, >> but applies and passes hmm selftests on mm trees as is. >> >> I plan to do v9 refresh and maybe minor updates in week or so. >> > It might be good to send a version which applies to drm-tip to > intel-xe@lists.freedesktop.org to trigger our CI too. I know tested an > earlier rev and everything seemed to be working but another round of > testing before merging is likely a good idea. > > Matt Sure, will do that, thanks! --Mika