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{ "id": 2217368, "url": "http://patchwork.ozlabs.org/api/covers/2217368/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/cover/20260328074013.3589544-1-ruanjinjie@huawei.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260328074013.3589544-1-ruanjinjie@huawei.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260328074013.3589544-1-ruanjinjie@huawei.com/", "date": "2026-03-28T07:40:02", "name": "[v11,00/11] arm64/riscv: Add support for crashkernel CMA reservation", "submitter": { "id": 84791, "url": "http://patchwork.ozlabs.org/api/people/84791/?format=api", "name": "Jinjie Ruan", "email": "ruanjinjie@huawei.com" }, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/cover/20260328074013.3589544-1-ruanjinjie@huawei.com/mbox/", "series": [ { "id": 497856, "url": "http://patchwork.ozlabs.org/api/series/497856/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=497856", "date": "2026-03-28T07:40:03", "name": "arm64/riscv: Add support for crashkernel CMA reservation", "version": 11, "mbox": "http://patchwork.ozlabs.org/series/497856/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2217368/comments/", "headers": { "Return-Path": "\n <linuxppc-dev+bounces-18951-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=huawei.com header.i=@huawei.com header.a=rsa-sha256\n header.s=dkim header.b=uvotX97y;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=huawei.com;\n dkim=pass (1024-bit key;\n unprotected) header.d=huawei.com header.i=@huawei.com header.a=rsa-sha256\n header.s=dkim header.b=uvotX97y; dkim-atps=neutral;\n spf=pass (client-ip=113.46.200.223; helo=canpmsgout08.his.huawei.com;\n envelope-from=ruanjinjie@huawei.com;\n receiver=lists.ozlabs.org) smtp.mailfrom=huawei.com", "dkim-signature": "v=1; a=rsa-sha256; d=huawei.com; s=dkim;\n\tc=relaxed/relaxed; q=dns/txt;\n\th=From;\n\tbh=ipRmD0/2OdKsTaPJkmq5XYbzQlr05HqxdeagwMOmVUI=;\n\tb=uvotX97yDNtH1amJpIj2s4O197fY2nMqoozQvJt0womhY4365jCUitbUFDPvBhpuA8STynNi/\n\tZU7ilNRpKFmtww5v2wwSEX29aCu+HIF3+GAuZ/Llme4Gqgl8ZAUxTkZxDkHCNv0fWU90Gupbsjx\n\tMVXXqh9Hj2VDeQ9DmNh3DMw=", "From": "Jinjie Ruan <ruanjinjie@huawei.com>", "To": "<corbet@lwn.net>, <skhan@linuxfoundation.org>, <catalin.marinas@arm.com>,\n\t<will@kernel.org>, <chenhuacai@kernel.org>, <kernel@xen0n.name>,\n\t<maddy@linux.ibm.com>, <mpe@ellerman.id.au>, <npiggin@gmail.com>,\n\t<chleroy@kernel.org>, <pjw@kernel.org>, <palmer@dabbelt.com>,\n\t<aou@eecs.berkeley.edu>, <alex@ghiti.fr>, <tglx@kernel.org>,\n\t<mingo@redhat.com>, <bp@alien8.de>, <dave.hansen@linux.intel.com>,\n\t<hpa@zytor.com>, <robh@kernel.org>, <saravanak@kernel.org>,\n\t<akpm@linux-foundation.org>, <bhe@redhat.com>, <vgoyal@redhat.com>,\n\t<dyoung@redhat.com>, <rdunlap@infradead.org>, <peterz@infradead.org>,\n\t<feng.tang@linux.alibaba.com>, <pawan.kumar.gupta@linux.intel.com>,\n\t<dapeng1.mi@linux.intel.com>, <kees@kernel.org>, <elver@google.com>,\n\t<paulmck@kernel.org>, <lirongqing@baidu.com>, <rppt@kernel.org>,\n\t<leitao@debian.org>, <ardb@kernel.org>, <cfsworks@gmail.com>,\n\t<osandov@fb.com>, <jbohac@suse.cz>, <tangyouling@kylinos.cn>,\n\t<sourabhjain@linux.ibm.com>, <ritesh.list@gmail.com>,\n\t<eajames@linux.ibm.com>, <songshuaishuai@tinylab.org>,\n\t<kevin.brodsky@arm.com>, <vishal.moola@gmail.com>,\n\t<junhui.liu@pigmoral.tech>, <coxu@redhat.com>, <fuqiang.wang@easystack.cn>,\n\t<liaoyuanhong@vivo.com>, <guoren@kernel.org>, <chenjiahao16@huawei.com>,\n\t<hbathini@linux.ibm.com>, <takahiro.akashi@linaro.org>,\n\t<james.morse@arm.com>, <lizhengyu3@huawei.com>, <x86@kernel.org>,\n\t<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,\n\t<linux-arm-kernel@lists.infradead.org>, <loongarch@lists.linux.dev>,\n\t<linuxppc-dev@lists.ozlabs.org>, <linux-riscv@lists.infradead.org>,\n\t<devicetree@vger.kernel.org>, <kexec@lists.infradead.org>", "CC": "<ruanjinjie@huawei.com>", "Subject": "[PATCH v11 00/11] arm64/riscv: Add support for crashkernel CMA\n 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": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "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\n dggpemf500011.china.huawei.com (7.185.36.131)", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "The crash memory allocation, and the exclude of crashk_res, crashk_low_res\nand crashk_cma memory are almost identical across different architectures,\nThis patch set handle them in crash core in a general way, which eliminate\na lot of duplication code.\n\nAnd add support for crashkernel CMA reservation for arm64 and riscv.\n\nRebased on v7.0-rc1.\n\nBasic second kernel boot test were performed on QEMU platforms for x86,\nARM64, and RISC-V architectures with the following parameters:\n\n>-------\"cma=256M crashkernel=256M crashkernel=64M,cma\"\n\nChanges in v11:\n- Avoid silently drop crash memory if the crash kernel is built without\n CONFIG_CMA.\n- Remove unnecessary \"cmem->nr_ranges = 0\" for arch_crash_populate_cmem()\n as we use kvzalloc().\n- Provide a separate patch for each architecture to fix the existing\n buffer overflow issue.\n- Add Acked-bys for arm64.\n\nChanges in v10:\n- Fix crashk_low_res not excluded bug in the existing\n RISC-V code.\n- Fix an existing memory leak issue in the existing PowerPC code.\n- Fix the ordering issue of adding CMA ranges to\n \"linux,usable-memory-range\".\n- Fix an existing concurrency issue. A Concurrent memory hotplug may occur\n between reading memblock and attempting to fill cmem during kexec_load()\n for almost all existing architectures.\n- Link to v9: https://lore.kernel.org/all/20260323072745.2481719-1-ruanjinjie@huawei.com/\n\nChanges in v9:\n- Collect Reviewed-by and Acked-by, and prepare for Sashiko AI review.\n- Link to v8: https://lore.kernel.org/all/20260302035315.3892241-1-ruanjinjie@huawei.com/\n\nChanges in v8:\n- Fix the build issues reported by kernel test robot and Sourabh.\n- Link to v7: https://lore.kernel.org/all/20260226130437.1867658-1-ruanjinjie@huawei.com/\n\nChanges in v7:\n- Correct the inclusion of CMA-reserved ranges for kdump kernel in of/kexec\n for arm64 and riscv.\n- Add Acked-by.\n- Link to v6: https://lore.kernel.org/all/20260224085342.387996-1-ruanjinjie@huawei.com/\n\nChanges in v6:\n- Update the crash core exclude code as Mike suggested.\n- Rebased on v7.0-rc1.\n- Add acked-by.\n- Link to v5: https://lore.kernel.org/all/20260212101001.343158-1-ruanjinjie@huawei.com/\n\nChanges in v5:\n- Fix the kernel test robot build warnings.\n- Sort crash memory ranges before preparing elfcorehdr for powerpc\n- Link to v4: https://lore.kernel.org/all/20260209095931.2813152-1-ruanjinjie@huawei.com/\n\nChanges in v4:\n- Move the size calculation (and the realloc if needed) into the\n generic crash.\n- Link to v3: https://lore.kernel.org/all/20260204093728.1447527-1-ruanjinjie@huawei.com/\n\nJinjie Ruan (10):\n riscv: kexec_file: Fix crashk_low_res not exclude bug\n powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()\n x86/kexec: Fix potential buffer overflow in prepare_elf_headers()\n arm64: kexec_file: Fix potential buffer overflow in\n prepare_elf_headers()\n riscv: kexec_file: Fix potential buffer overflow in\n prepare_elf_headers()\n LoongArch: kexec: Fix potential buffer overflow in\n prepare_elf_headers()\n crash: Exclude crash kernel memory in crash core\n crash: Use crash_exclude_core_ranges() on powerpc\n arm64: kexec: Add support for crashkernel CMA reservation\n riscv: kexec: Add support for crashkernel CMA reservation\n\nSourabh Jain (1):\n powerpc/crash: sort crash memory ranges before preparing elfcorehdr\n\n .../admin-guide/kernel-parameters.txt | 16 +--\n arch/arm64/kernel/machine_kexec_file.c | 43 +++-----\n arch/arm64/mm/init.c | 5 +-\n arch/loongarch/kernel/machine_kexec_file.c | 43 +++-----\n arch/powerpc/include/asm/kexec_ranges.h | 1 -\n arch/powerpc/kexec/crash.c | 7 +-\n arch/powerpc/kexec/ranges.c | 101 +-----------------\n arch/riscv/kernel/machine_kexec_file.c | 42 +++-----\n arch/riscv/mm/init.c | 5 +-\n arch/x86/kernel/crash.c | 92 +++-------------\n drivers/of/fdt.c | 9 +-\n drivers/of/kexec.c | 9 ++\n include/linux/crash_core.h | 9 ++\n include/linux/crash_reserve.h | 4 +-\n kernel/crash_core.c | 89 ++++++++++++++-\n 15 files changed, 194 insertions(+), 281 deletions(-)" }