[PATCH v3 5/5] crash: export crashkernel CMA reservation to userspace
From: Sourabh Jain <hidden>
Date: 2025-11-10 04:32:43
Also in:
kexec, lkml
Subsystem:
kexec, the rest · Maintainers:
Andrew Morton, Baoquan He, Mike Rapoport, Pasha Tatashin, Pratyush Yadav, Linus Torvalds
Add a sysfs entry /sys/kernel/kexec/crash_cma_ranges to expose all CMA crashkernel ranges. This allows userspace tools configuring kdump to determine how much memory is reserved for crashkernel. If CMA is used, tools can warn users when attempting to capture user pages with CMA reservation. The new sysfs hold the CMA ranges in below format: cat /sys/kernel/kexec/crash_cma_ranges 100000000-10c7fffff Cc: Aditya Gupta <redacted> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Baoquan he <redacted> Cc: Dave Young <redacted> Cc: Hari Bathini <hbathini@linux.ibm.com> Cc: Jiri Bohac <redacted> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Mahesh J Salgaonkar <mahesh@linux.ibm.com> Cc: Pingfan Liu <redacted> Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Cc: Shivang Upadhyay <redacted> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: linuxppc-dev@lists.ozlabs.org Cc: kexec@lists.infradead.org Signed-off-by: Sourabh Jain <redacted> --- Changelog: - Add the missing hunk to export crash_cma_ranges sysfs --- .../ABI/testing/sysfs-kernel-kexec-kdump | 10 ++++++++++ kernel/kexec_core.c | 17 +++++++++++++++++ 2 files changed, 27 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-kernel-kexec-kdump b/Documentation/ABI/testing/sysfs-kernel-kexec-kdump
index 00c00f380fea..f59051b5d96d 100644
--- a/Documentation/ABI/testing/sysfs-kernel-kexec-kdump
+++ b/Documentation/ABI/testing/sysfs-kernel-kexec-kdump@@ -49,3 +49,13 @@ Description: read only is used by the user space utility kexec to support updating the in-kernel kdump image during hotplug operations. User: Kexec tools + +What: /sys/kernel/kexec/crash_cma_ranges +Date: Nov 2025 +Contact: kexec@lists.infradead.org +Description: read only + Provides information about the memory ranges reserved from + the Contiguous Memory Allocator (CMA) area that are allocated + to the crash (kdump) kernel. It lists the start and end physical + addresses of CMA regions assigned for crashkernel use. +User: kdump service
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 7476a46de5d6..da6ff72b4669 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c@@ -1271,6 +1271,22 @@ static ssize_t crash_size_store(struct kobject *kobj, } static struct kobj_attribute crash_size_attr = __ATTR_RW(crash_size); +static ssize_t crash_cma_ranges_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + + ssize_t len = 0; + int i; + + for (i = 0; i < crashk_cma_cnt; ++i) { + len += sysfs_emit_at(buf, len, "%08llx-%08llx\n", + crashk_cma_ranges[i].start, + crashk_cma_ranges[i].end); + } + return len; +} +static struct kobj_attribute crash_cma_ranges_attr = __ATTR_RO(crash_cma_ranges); + #ifdef CONFIG_CRASH_HOTPLUG static ssize_t crash_elfcorehdr_size_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
@@ -1289,6 +1305,7 @@ static struct attribute *kexec_attrs[] = { #ifdef CONFIG_CRASH_DUMP &crash_loaded_attr.attr, &crash_size_attr.attr, + &crash_cma_ranges_attr.attr, #ifdef CONFIG_CRASH_HOTPLUG &crash_elfcorehdr_size_attr.attr, #endif
--
2.51.1