From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8E95B10BA424 for ; Sat, 28 Mar 2026 07:41:35 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4fjTwR6yL2z2yjV; Sat, 28 Mar 2026 18:41:27 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=113.46.200.223 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1774683687; cv=none; b=P3ziA4/kjxT6xr9aOZL4K2gn2hqfQ3Oz9CpaTCg/8bM5jQODfdf9ecOU0C14lOFG6MMcr+9RbuDHh6XyNkKt0Gyeu9OXfi67KuPpFNV9Rj8FLX88poEt9gue5Q6LRgWLW7aVfdGOzthOhVN/ShRHUeVtFO4f++USy0NopTMHBPrx39QePFXumP6xBhAv/9PJmGtqiK/yMp2DEh+O354DFP1qsj2i0bcIGIif0Zwb3ZenuTWReENoyPFoJc/cKVnif6BsM3TBnKRIYD8CgdmjZ3NG/GwDjXbFBRgPRIdYXuwmR86dNkp3lN6FCXRmVBpKQSA/ofz6INMBovamK1vPkQ== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1774683687; c=relaxed/relaxed; bh=ipRmD0/2OdKsTaPJkmq5XYbzQlr05HqxdeagwMOmVUI=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=ogQUmGHfbBqBgdKoeopvsagwdWQQDQVhxEAOQeN/1SHxv0hTCC5JJBpr/AFEE6OzNMlewytsXelsTqOLJ3NTmvnw3aFMA2/r8ZRyAciGJez31g1ZRH0gdcxmomyNhipSDivSIkg5eHpRjSdfohmj+hHhj7HfVqTJyOONbffS5tgnjLfMEMyRmcIFybiSr6XNRduCisLJwUU99TdYPqDgwf1r+WdtcEmjMycn9akpu3vQvGIF8MW3tObwYEPInmfHce0EAaTRmn8c2PEUAZP4HZP7EYf4C7eq5g8z1+HLEAEbSB3QYEnLKkIBBn1SavinxOlgXFiTNvh2pBHNzHvTZw== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; dkim=pass (1024-bit key; unprotected) header.d=huawei.com header.i=@huawei.com header.a=rsa-sha256 header.s=dkim header.b=uvotX97y; dkim-atps=neutral; spf=pass (client-ip=113.46.200.223; helo=canpmsgout08.his.huawei.com; envelope-from=ruanjinjie@huawei.com; receiver=lists.ozlabs.org) smtp.mailfrom=huawei.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=huawei.com header.i=@huawei.com header.a=rsa-sha256 header.s=dkim header.b=uvotX97y; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=huawei.com (client-ip=113.46.200.223; helo=canpmsgout08.his.huawei.com; envelope-from=ruanjinjie@huawei.com; receiver=lists.ozlabs.org) Received: from canpmsgout08.his.huawei.com (canpmsgout08.his.huawei.com [113.46.200.223]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4fjTwN2HbGz2yfK for ; Sat, 28 Mar 2026 18:41:22 +1100 (AEDT) dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=ipRmD0/2OdKsTaPJkmq5XYbzQlr05HqxdeagwMOmVUI=; b=uvotX97yDNtH1amJpIj2s4O197fY2nMqoozQvJt0womhY4365jCUitbUFDPvBhpuA8STynNi/ ZU7ilNRpKFmtww5v2wwSEX29aCu+HIF3+GAuZ/Llme4Gqgl8ZAUxTkZxDkHCNv0fWU90Gupbsjx MVXXqh9Hj2VDeQ9DmNh3DMw= Received: from mail.maildlp.com (unknown [172.19.163.127]) by canpmsgout08.his.huawei.com (SkyGuard) with ESMTPS id 4fjTn767Z5zmV79; Sat, 28 Mar 2026 15:35:07 +0800 (CST) Received: from dggpemf500011.china.huawei.com (unknown [7.185.36.131]) by mail.maildlp.com (Postfix) with ESMTPS id 9CAE440363; Sat, 28 Mar 2026 15:41:16 +0800 (CST) Received: from huawei.com (10.90.53.73) by dggpemf500011.china.huawei.com (7.185.36.131) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Sat, 28 Mar 2026 15:41:13 +0800 From: Jinjie Ruan To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [PATCH v11 00/11] arm64/riscv: Add support for crashkernel CMA reservation Date: Sat, 28 Mar 2026 15:40:02 +0800 Message-ID: <20260328074013.3589544-1-ruanjinjie@huawei.com> X-Mailer: git-send-email 2.34.1 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [10.90.53.73] X-ClientProxiedBy: kwepems100001.china.huawei.com (7.221.188.238) To dggpemf500011.china.huawei.com (7.185.36.131) The crash memory allocation, and the exclude of crashk_res, crashk_low_res and crashk_cma memory are almost identical across different architectures, This patch set handle them in crash core in a general way, which eliminate a lot of duplication code. And add support for crashkernel CMA reservation for arm64 and riscv. Rebased on v7.0-rc1. Basic second kernel boot test were performed on QEMU platforms for x86, ARM64, and RISC-V architectures with the following parameters: >-------"cma=256M crashkernel=256M crashkernel=64M,cma" Changes in v11: - Avoid silently drop crash memory if the crash kernel is built without CONFIG_CMA. - Remove unnecessary "cmem->nr_ranges = 0" for arch_crash_populate_cmem() as we use kvzalloc(). - Provide a separate patch for each architecture to fix the existing buffer overflow issue. - Add Acked-bys for arm64. Changes in v10: - Fix crashk_low_res not excluded bug in the existing RISC-V code. - Fix an existing memory leak issue in the existing PowerPC code. - Fix the ordering issue of adding CMA ranges to "linux,usable-memory-range". - Fix an existing concurrency issue. A Concurrent memory hotplug may occur between reading memblock and attempting to fill cmem during kexec_load() for almost all existing architectures. - Link to v9: https://lore.kernel.org/all/20260323072745.2481719-1-ruanjinjie@huawei.com/ Changes in v9: - Collect Reviewed-by and Acked-by, and prepare for Sashiko AI review. - Link to v8: https://lore.kernel.org/all/20260302035315.3892241-1-ruanjinjie@huawei.com/ Changes in v8: - Fix the build issues reported by kernel test robot and Sourabh. - Link to v7: https://lore.kernel.org/all/20260226130437.1867658-1-ruanjinjie@huawei.com/ Changes in v7: - Correct the inclusion of CMA-reserved ranges for kdump kernel in of/kexec for arm64 and riscv. - Add Acked-by. - Link to v6: https://lore.kernel.org/all/20260224085342.387996-1-ruanjinjie@huawei.com/ Changes in v6: - Update the crash core exclude code as Mike suggested. - Rebased on v7.0-rc1. - Add acked-by. - Link to v5: https://lore.kernel.org/all/20260212101001.343158-1-ruanjinjie@huawei.com/ Changes in v5: - Fix the kernel test robot build warnings. - Sort crash memory ranges before preparing elfcorehdr for powerpc - Link to v4: https://lore.kernel.org/all/20260209095931.2813152-1-ruanjinjie@huawei.com/ Changes in v4: - Move the size calculation (and the realloc if needed) into the generic crash. - Link to v3: https://lore.kernel.org/all/20260204093728.1447527-1-ruanjinjie@huawei.com/ Jinjie Ruan (10): riscv: kexec_file: Fix crashk_low_res not exclude bug powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr() x86/kexec: Fix potential buffer overflow in prepare_elf_headers() arm64: kexec_file: Fix potential buffer overflow in prepare_elf_headers() riscv: kexec_file: Fix potential buffer overflow in prepare_elf_headers() LoongArch: kexec: Fix potential buffer overflow in prepare_elf_headers() crash: Exclude crash kernel memory in crash core crash: Use crash_exclude_core_ranges() on powerpc arm64: kexec: Add support for crashkernel CMA reservation riscv: kexec: Add support for crashkernel CMA reservation Sourabh Jain (1): powerpc/crash: sort crash memory ranges before preparing elfcorehdr .../admin-guide/kernel-parameters.txt | 16 +-- arch/arm64/kernel/machine_kexec_file.c | 43 +++----- arch/arm64/mm/init.c | 5 +- arch/loongarch/kernel/machine_kexec_file.c | 43 +++----- arch/powerpc/include/asm/kexec_ranges.h | 1 - arch/powerpc/kexec/crash.c | 7 +- arch/powerpc/kexec/ranges.c | 101 +----------------- arch/riscv/kernel/machine_kexec_file.c | 42 +++----- arch/riscv/mm/init.c | 5 +- arch/x86/kernel/crash.c | 92 +++------------- drivers/of/fdt.c | 9 +- drivers/of/kexec.c | 9 ++ include/linux/crash_core.h | 9 ++ include/linux/crash_reserve.h | 4 +- kernel/crash_core.c | 89 ++++++++++++++- 15 files changed, 194 insertions(+), 281 deletions(-) -- 2.34.1