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 5D746CC6B0E for ; Thu, 2 Apr 2026 07:25:54 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4fmYL82qkXz2yYy; Thu, 02 Apr 2026 18:25:52 +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=1775114752; cv=none; b=TXtUohDbdz5YKIurSj4PxA4wdOUHltsrGrmzPqT9buLFznAUpcx9EVdZzodX6P3zGS/wgHZJbSfwmKe3Jf1H2YrxNSxh4+B5V6Ln4+UvEmGmt3zSkljFElxO2me6YhI9fVw/coM+mxRypeUq8C/dCseudfg3h6AKvFLjfq6ljyUo3wUA4RiuB7fLElT80cHPAyfFQ/WQ4H+Gye4AoF1rkIG5lohoRxwS794R1hlT+it3H5GaP05RfrbYLJPSH1K8CqJ+EMJ1AzJFneY7+fZdiZ/8w/u53R3pI7Wjy4s6ENptIeuGeAWlvumTKjeckq9M+pmMuU/wYw347OX0ZneefA== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1775114752; c=relaxed/relaxed; bh=bYL91xN0k8SZnYn2ZHMX4edxJPIDmixyuT6I/2tV1KM=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=F+zw/6tM1F7DhCPdIR+BrWhqPACp1ozV0C8zH3WCTLWamotx2ceUQREXQ4vUkDt361v7voVTxjn9d/naz2IjhPmSap1tGRuBkLDWbIsgKN4bCtHp7GDE2HNpETm5gF8KaPyc87ylO4/VtPJlcnKOL6WSyQjIKu3Aggx3bMQ/fk55E961F5FlCD1CAdvh6bFBnSNON8gbhAjNTzR1GXR+ANMQgFO2wrh3kK2MPJ4cR15xEwOiIhLI0WF/8X7HXihG4gDyHTWDfFv/FRY+VP/ZjypV/ElullGVzgx5ob91KzGqkFkAfajYX8JjXESJ7Xo2hz9rPz0WGnTaqIIXaAkqiw== 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=XFyO3HZg; 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=XFyO3HZg; 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 4fmYL54DMxz2xln for ; Thu, 02 Apr 2026 18:25:47 +1100 (AEDT) dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=bYL91xN0k8SZnYn2ZHMX4edxJPIDmixyuT6I/2tV1KM=; b=XFyO3HZgPGaDclg6e0kCRls2FHdfMYpdC5yms5BvvsRgBGd2Mu9MZgAQiTWuWzi6LVfzcOwAC w0CWALY8ELZuLBpl3hpqaDyz/yC9GzujhZhy2cZMcSjsxlrSaYXfKMw3v6LZsF9y3wsPlsfcowX MKlW+josArpEIRhERDnXVeU= Received: from mail.maildlp.com (unknown [172.19.163.127]) by canpmsgout08.his.huawei.com (SkyGuard) with ESMTPS id 4fmYBp74XLzmVWV; Thu, 2 Apr 2026 15:19:30 +0800 (CST) Received: from dggpemf500011.china.huawei.com (unknown [7.185.36.131]) by mail.maildlp.com (Postfix) with ESMTPS id C81BC402AB; Thu, 2 Apr 2026 15:25:42 +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; Thu, 2 Apr 2026 15:25:39 +0800 From: Jinjie Ruan To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [PATCH v12 00/15] arm64/riscv: Add support for crashkernel CMA reservation Date: Thu, 2 Apr 2026 15:26:46 +0800 Message-ID: <20260402072701.628293-1-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: kwepems100002.china.huawei.com (7.221.188.206) 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 v12: - Remove the unused "nr_mem_ranges" for x86. - Add "Fix crashk_low_res not exclude bug" test log. - Provide a separate patch for each architecture for using crash_prepare_headers(), which will make the review more convenient. - Add Reviewed-by and Tested-by. - Link to v11: https://lore.kernel.org/all/20260328074013.3589544-1-ruanjinjie@huawei.com/ 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/ Jinjie Ruan (14): 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: Add crash_prepare_headers() to exclude crash kernel memory arm64: kexec_file: Use crash_prepare_headers() helper to simplify code x86/kexec: Use crash_prepare_headers() helper to simplify code riscv: kexec_file: Use crash_prepare_headers() helper to simplify code LoongArch: kexec: Use crash_prepare_headers() helper to simplify code 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, 193 insertions(+), 282 deletions(-) -- 2.34.1