{"id":2234552,"url":"http://patchwork.ozlabs.org/api/1.2/covers/2234552/?format=json","web_url":"http://patchwork.ozlabs.org/project/uboot/cover/20260507-b4-mmu-unmap-fixes-v3-0-aac7726d87d5@linaro.org/","project":{"id":18,"url":"http://patchwork.ozlabs.org/api/1.2/projects/18/?format=json","name":"U-Boot","link_name":"uboot","list_id":"u-boot.lists.denx.de","list_email":"u-boot@lists.denx.de","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260507-b4-mmu-unmap-fixes-v3-0-aac7726d87d5@linaro.org>","list_archive_url":null,"date":"2026-05-07T19:58:07","name":"[v3,0/4] armv8: mmu: fix region unmapping and optimise set_one_region()","submitter":{"id":90679,"url":"http://patchwork.ozlabs.org/api/1.2/people/90679/?format=json","name":"Casey Connolly","email":"casey.connolly@linaro.org"},"mbox":"http://patchwork.ozlabs.org/project/uboot/cover/20260507-b4-mmu-unmap-fixes-v3-0-aac7726d87d5@linaro.org/mbox/","series":[{"id":503261,"url":"http://patchwork.ozlabs.org/api/1.2/series/503261/?format=json","web_url":"http://patchwork.ozlabs.org/project/uboot/list/?series=503261","date":"2026-05-07T19:58:07","name":"armv8: mmu: fix region unmapping and optimise set_one_region()","version":3,"mbox":"http://patchwork.ozlabs.org/series/503261/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/2234552/comments/","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=VXRsXfwL;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; 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charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","X-B4-Tracking":"v=1; b=H4sIAAAAAAAC/yXMQQqDMBCF4avIrB1IY6rgVYoLTSbtCEklY0QQ7\n 25qlx+P/x0glJgE+uqARBsLf2NBU1dgP2N8E7IrBq10q56qw8lgCBlzDOOCnncSfPiOlLatNc5\n DCZdE91C61/C35Gkmu/6e4Dwv6BXOQXYAAAA=","X-Change-ID":"20260507-b4-mmu-unmap-fixes-1f7e02c6c4df","To":"u-boot@lists.denx.de","Cc":"Tom Rini , Anshul Dalal ,\n Casey Connolly ,\n Ilias Apalodimas , Dhruva Gole ,\n Mark Kettenis ,\n Patrice Chotard ,\n Sumit Garg ","X-Mailer":"b4 0.16-dev","X-Developer-Signature":"v=1; a=openpgp-sha256; l=1639;\n i=casey.connolly@linaro.org; h=from:subject:message-id;\n bh=iGFZVImLC/ZOZuR56tXJdvPIBIAUJWQ4EZma5v33BN4=;\n b=owGbwMvMwCFYaeA6f6eBkTjjabUkhsw/727PipljNJP/o/MJH2G7Gu37rNKb4gIubfPmXXDul\n /PvpSLOHaUsDIIcDLJiiiziJ5ZZNq29bK+xfcEFmDmsTCBDGLg4BWAi714w/BWZO2W2ANv83fMT\n 766Uf3O/eErfsjOzV+dE5u1M3lLBeVKbkWGdvIVz759Pu6Y4vIpmFI74KOSsJ9SesLvO4uWP9gN\n bRAoB","X-Developer-Key":"i=casey.connolly@linaro.org; a=openpgp;\n fpr=83B24DA7FE145076BC38BB250CD904EB673A7C47","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"},"content":"Currently trying to unmap a region results in slow and largely broken\nbehaviour as we unnecessarily split blocks and manually set thousands of\nindividual 4k pages instead of higher level blocks.\n\nThis series fixes the behaviour of set_one_region() so that it works properly when called to unmap regions. See patch 4 for details.\n\nPatches 1 & 2 improve the existing debug functionality, the pagetable\ndumper will now print most explicitly unmapped regions (since they still\nhave their PA intact), as well as adding a new function which does a\nvery basic software TLB lookup to help with debugging.\n\nPatch 3 de-duplicates some code by moving the loop that always surrounds\nset_one_region() calls into its own function, this also helps with\nreadability in the calling functions.\n\nChanges in v3:\n- Reworked entirely to be correct, v2 would cause unrelated pages to\n get updated too if the region was inside a block.\n- Added additional patches with debugging improvements and code cleanup\n- V2: https://lore.kernel.org/u-boot/20260504183721.646712-1-casey.connolly@linaro.org/\n\n---\nCasey Connolly (4):\n armv8: mmu: add a function to help debug TLB lookups\n armv8: mmu: teach the pagetable dumper to show explicit FAULT maps\n armv8: mmu: commonize the set_one_region() loop\n armv8: mmu: fix and optimise explicitly unmapping regions\n\n arch/arm/cpu/armv8/cache_v8.c | 172 +++++++++++++++++++++++----------------\n arch/arm/include/asm/armv8/mmu.h | 7 ++\n 2 files changed, 107 insertions(+), 72 deletions(-)\n---\nbase-commit: bb0f3eebb3c196d9b6efbbd1e5aa9b16abbb9ad6\n\n// Casey (she/they)"}