{"id":2218969,"url":"http://patchwork.ozlabs.org/api/patches/2218969/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260402072701.628293-16-ruanjinjie@huawei.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/projects/2/?format=json","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":"<20260402072701.628293-16-ruanjinjie@huawei.com>","list_archive_url":"https://lore.kernel.org/linuxppc-dev/20260402072701.628293-16-ruanjinjie@huawei.com/","date":"2026-04-02T07:27:01","name":"[v12,15/15] riscv: kexec: Add support for crashkernel CMA reservation","commit_ref":null,"pull_url":null,"state":"handled-elsewhere","archived":false,"hash":"580a0db999d4bd6203e02638e6b190e88616273c","submitter":{"id":84791,"url":"http://patchwork.ozlabs.org/api/people/84791/?format=json","name":"Jinjie Ruan","email":"ruanjinjie@huawei.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260402072701.628293-16-ruanjinjie@huawei.com/mbox/","series":[{"id":498443,"url":"http://patchwork.ozlabs.org/api/series/498443/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498443","date":"2026-04-02T07:26:46","name":"arm64/riscv: Add support for crashkernel CMA reservation","version":12,"mbox":"http://patchwork.ozlabs.org/series/498443/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2218969/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2218969/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","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=XG5yIWzK;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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a=rsa-sha256; d=huawei.com; s=dkim;\n\tc=relaxed/relaxed; q=dns/txt;\n\th=From;\n\tbh=HnOZBoE7o/6/IAIFfJRvYly50aiP5r33Q2nsL/6jnAk=;\n\tb=XG5yIWzKdNW6ZIUY1IeNuIEmda+qjNe0mzM2RASvpMLKA0VQyQ/lc6+rvBeGvBX+PHLq0rmN8\n\t6maPKZC3t1oDwPlnVH2scDHAWSypKM/eoZXO8x2x3aPMSOnuwmoXvUB0FMtVLUEM+QRz81W/Ad+\n\tTQceOxVP8w3Sk+4wK8jsbiM=","From":"Jinjie Ruan ","To":", , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, , ,\n\t, ,\n\t, , ,\n\t, ,\n\t, ,\n\t, ,\n\t, ,\n\t","CC":"","Subject":"[PATCH v12 15/15] riscv: kexec: Add support for crashkernel CMA\n reservation","Date":"Thu, 2 Apr 2026 15:27:01 +0800","Message-ID":"<20260402072701.628293-16-ruanjinjie@huawei.com>","X-Mailer":"git-send-email 2.34.1","In-Reply-To":"<20260402072701.628293-1-ruanjinjie@huawei.com>","References":"<20260402072701.628293-1-ruanjinjie@huawei.com>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-Originating-IP":"[10.90.53.73]","X-ClientProxiedBy":"kwepems100002.china.huawei.com (7.221.188.206) 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":"Commit 35c18f2933c5 (\"Add a new optional \",cma\" suffix to the\ncrashkernel= command line option\") and commit ab475510e042 (\"kdump:\nimplement reserve_crashkernel_cma\") added CMA support for kdump\ncrashkernel reservation. This allows the kernel to dynamically allocate\ncontiguous memory for crash dumping when needed, rather than permanently\nreserving a fixed region at boot time.\n\nSo extend crashkernel CMA reservation support to riscv. The following\nchanges are made to enable CMA reservation:\n\n- Parse and obtain the CMA reservation size along with other crashkernel\n parameters.\n- Call reserve_crashkernel_cma() to allocate the CMA region for kdump.\n- Include the CMA-reserved ranges for kdump kernel to use, which was\n already done in of_kexec_alloc_and_setup_fdt().\n- Exclude the CMA-reserved ranges from the crash kernel memory to\n prevent them from being exported through /proc/vmcore, which was\n already done in the crash core.\n\nUpdate kernel-parameters.txt to document CMA support for crashkernel on\nriscv architecture.\n\nCc: Paul Walmsley \nCc: Palmer Dabbelt \nCc: Albert Ou \nCc: Alexandre Ghiti \nAcked-by: Baoquan He \nAcked-by: Mike Rapoport (Microsoft) \nAcked-by: Paul Walmsley # arch/riscv\nSigned-off-by: Jinjie Ruan \n---\n Documentation/admin-guide/kernel-parameters.txt | 16 ++++++++--------\n arch/riscv/kernel/machine_kexec_file.c | 2 +-\n arch/riscv/mm/init.c | 5 +++--\n 3 files changed, 12 insertions(+), 11 deletions(-)","diff":"diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt\nindex a7055cead40f..13ced9ea42f4 100644\n--- a/Documentation/admin-guide/kernel-parameters.txt\n+++ b/Documentation/admin-guide/kernel-parameters.txt\n@@ -1122,14 +1122,14 @@ Kernel parameters\n \t\t\tIt will be ignored when crashkernel=X,high is not used\n \t\t\tor memory reserved is below 4G.\n \tcrashkernel=size[KMG],cma\n-\t\t\t[KNL, X86, ARM64, PPC] Reserve additional crash kernel memory from\n-\t\t\tCMA. This reservation is usable by the first system's\n-\t\t\tuserspace memory and kernel movable allocations (memory\n-\t\t\tballoon, zswap). Pages allocated from this memory range\n-\t\t\twill not be included in the vmcore so this should not\n-\t\t\tbe used if dumping of userspace memory is intended and\n-\t\t\tit has to be expected that some movable kernel pages\n-\t\t\tmay be missing from the dump.\n+\t\t\t[KNL, X86, ARM64, RISCV, PPC] Reserve additional crash\n+\t\t\tkernel memory from CMA. This reservation is usable by\n+\t\t\tthe first system's userspace memory and kernel movable\n+\t\t\tallocations (memory balloon, zswap). Pages allocated\n+\t\t\tfrom this memory range will not be included in the vmcore\n+\t\t\tso this should not be used if dumping of userspace memory\n+\t\t\tis intended and it has to be expected that some movable\n+\t\t\tkernel pages may be missing from the dump.\n \n \t\t\tA standard crashkernel reservation, as described above,\n \t\t\tis still needed to hold the crash kernel and initrd.\ndiff --git a/arch/riscv/kernel/machine_kexec_file.c b/arch/riscv/kernel/machine_kexec_file.c\nindex bea818f75dd6..c79cd86d5713 100644\n--- a/arch/riscv/kernel/machine_kexec_file.c\n+++ b/arch/riscv/kernel/machine_kexec_file.c\n@@ -46,7 +46,7 @@ static int get_nr_ram_ranges_callback(struct resource *res, void *arg)\n \n unsigned int arch_get_system_nr_ranges(void)\n {\n-\tunsigned int nr_ranges = 2; /* For exclusion of crashkernel region */\n+\tunsigned int nr_ranges = 2 + crashk_cma_cnt; /* For exclusion of crashkernel region */\n \n \twalk_system_ram_res(0, -1, &nr_ranges, get_nr_ram_ranges_callback);\n \ndiff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c\nindex 811e03786c56..4cd49afa9077 100644\n--- a/arch/riscv/mm/init.c\n+++ b/arch/riscv/mm/init.c\n@@ -1398,7 +1398,7 @@ static inline void setup_vm_final(void)\n */\n static void __init arch_reserve_crashkernel(void)\n {\n-\tunsigned long long low_size = 0;\n+\tunsigned long long low_size = 0, cma_size = 0;\n \tunsigned long long crash_base, crash_size;\n \tbool high = false;\n \tint ret;\n@@ -1408,11 +1408,12 @@ static void __init arch_reserve_crashkernel(void)\n \n \tret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),\n \t\t\t\t&crash_size, &crash_base,\n-\t\t\t\t&low_size, NULL, &high);\n+\t\t\t\t&low_size, &cma_size, &high);\n \tif (ret)\n \t\treturn;\n \n \treserve_crashkernel_generic(crash_size, crash_base, low_size, high);\n+\treserve_crashkernel_cma(cma_size);\n }\n \n void __init paging_init(void)\n","prefixes":["v12","15/15"]}