[PATCH v2 0/5] kexec: reorganize sysfs interface and add new kexec sysfs

[PATCH v2 0/5] kexec: reorganize sysfs interface and add new kexec sysfs

[Sourabh Jain]

All existing kexec and kdump sysfs entries are moved to a new location,
/sys/kernel/kexec, to keep /sys/kernel/ clean and better organized.
Symlinks are created at the old locations for backward compatibility and
can be removed in the future [02/05].

While doing this cleanup, missing ABI documentation for the old sysfs
interfaces is added, and those entries are marked as deprecated
[01/05 and 03/05]. New ABI documentation is also added for the
reorganized interfaces. [04/05]

Along with this reorganization, a new sysfs file,
/sys/kernel/kexec/crash_cma_ranges, is introduced to export crashkernel
CMA reservation details to user space [05/05]. This helps tools determine the
total crashkernel reserved memory and warn users that capturing user
pages while CMA is reserved may cause incomplete or unreliable dumps.

Cc: Aditya Gupta <adityag@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Baoquan he <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mahesh J Salgaonkar <mahesh@linux.ibm.com>
Cc: Pingfan Liu <piliu@redhat.com>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Shivang Upadhyay <shivangu@linux.ibm.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: kexec@lists.infradead.org

Sourabh Jain (5):
  Documentation/ABI: add kexec and kdump sysfs interface
  kexec: move sysfs entries to /sys/kernel/kexec
  Documentation/ABI: mark old kexec sysfs deprecated
  kexec: document new kexec and kdump sysfs ABIs
  crash: export crashkernel CMA reservation to userspace

 .../ABI/obsolete/sysfs-kernel-kexec-kdump     |  59 +++++++++
 .../ABI/testing/sysfs-kernel-kexec-kdump      |  61 +++++++++
 kernel/kexec_core.c                           | 118 ++++++++++++++++++
 kernel/ksysfs.c                               |  68 +---------
 4 files changed, 239 insertions(+), 67 deletions(-)
 create mode 100644 Documentation/ABI/obsolete/sysfs-kernel-kexec-kdump
 create mode 100644 Documentation/ABI/testing/sysfs-kernel-kexec-kdump

-- 
2.51.0

[PATCH v2 1/5] Documentation/ABI: add kexec and kdump sysfs interface

[Sourabh Jain]

Add an ABI document for following kexec and kdump sysfs interface:
- /sys/kernel/kexec_loaded
- /sys/kernel/kexec_crash_loaded
- /sys/kernel/kexec_crash_size
- /sys/kernel/crash_elfcorehdr_size

Cc: Aditya Gupta <adityag@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Baoquan he <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mahesh J Salgaonkar <mahesh@linux.ibm.com>
Cc: Pingfan Liu <piliu@redhat.com>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Shivang Upadhyay <shivangu@linux.ibm.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: kexec@lists.infradead.org
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
---
 .../ABI/testing/sysfs-kernel-kexec-kdump      | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-kernel-kexec-kdump

diff --git a/Documentation/ABI/testing/sysfs-kernel-kexec-kdump b/Documentation/ABI/testing/sysfs-kernel-kexec-kdump
new file mode 100644
index 000000000000..96b24565b68e
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-kernel-kexec-kdump
@@ -0,0 +1,43 @@
+What:		/sys/kernel/kexec_loaded
+Date:		Jun 2006
+Contact:	kexec@lists.infradead.org
+Description:	read only
+		Indicates whether a new kernel image has been loaded
+		into memory using the kexec system call. It shows 1 if
+		a kexec image is present and ready to boot, or 0 if none
+		is loaded.
+User:		kexec tools, kdump service
+
+What:		/sys/kernel/kexec_crash_loaded
+Date:		Jun 2006
+Contact:	kexec@lists.infradead.org
+Description:	read only
+		Indicates whether a crash (kdump) kernel is currently
+		loaded into memory. It shows 1 if a crash kernel has been
+		successfully loaded for panic handling, or 0 if no crash
+		kernel is present.
+User:		Kexec tools, Kdump service
+
+What:		/sys/kernel/kexec_crash_size
+Date:		Dec 2009
+Contact:	kexec@lists.infradead.org
+Description:	read/write
+		Shows the amount of memory reserved for loading the crash
+		(kdump) kernel. It reports the size, in bytes, of the
+		crash kernel area defined by the crashkernel= parameter.
+		This interface also allows reducing the crashkernel
+		reservation by writing a smaller value, and the reclaimed
+		space is added back to the system RAM.
+User:		Kdump service
+
+What:		/sys/kernel/crash_elfcorehdr_size
+Date:		Aug 2023
+Contact:	kexec@lists.infradead.org
+Description:	read only
+		Indicates the preferred size of the memory buffer for the
+		ELF core header used by the crash (kdump) kernel. It defines
+		how much space is needed to hold metadata about the crashed
+		system, including CPU and memory information. This information
+		is used by the user space utility kexec to support updating the
+		in-kernel kdump image during hotplug operations.
+User:		Kexec tools
-- 
2.51.0

[PATCH v2 2/5] kexec: move sysfs entries to /sys/kernel/kexec

[Sourabh Jain]

Several kexec and kdump sysfs entries are currently placed directly
under /sys/kernel/, which clutters the directory and makes it harder to
identify unrelated entries. To improve organization and readability,
these entries are now moved under a dedicated directory,
/sys/kernel/kexec.

For backward compatibility, symlinks are created at the old locations
so that existing tools and scripts continue to work. These symlinks can
be removed in the future once users have switched to the new path.

While creating symlinks, entries are added in /sys/kernel/ that point
to their new locations under /sys/kernel/kexec/. If an error occurs
while adding a symlink, it is logged but does not stop initialization
of the remaining kexec sysfs symlinks.

The /sys/kernel/<crash_elfcorehdr_size | kexec/crash_elfcorehdr_size>
entry is now controlled by CONFIG_CRASH_DUMP instead of
CONFIG_VMCORE_INFO, as CONFIG_CRASH_DUMP also enables
CONFIG_VMCORE_INFO.

Cc: Aditya Gupta <adityag@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Baoquan he <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mahesh J Salgaonkar <mahesh@linux.ibm.com>
Cc: Pingfan Liu <piliu@redhat.com>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Shivang Upadhyay <shivangu@linux.ibm.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: kexec@lists.infradead.org
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
---
 kernel/kexec_core.c | 118 ++++++++++++++++++++++++++++++++++++++++++++
 kernel/ksysfs.c     |  68 +------------------------
 2 files changed, 119 insertions(+), 67 deletions(-)

diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index fa00b239c5d9..2e12a164e870 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -41,6 +41,7 @@
 #include <linux/objtool.h>
 #include <linux/kmsg_dump.h>
 #include <linux/dma-map-ops.h>
+#include <linux/sysfs.h>
 
 #include <asm/page.h>
 #include <asm/sections.h>
@@ -1229,3 +1230,120 @@ int kernel_kexec(void)
 	kexec_unlock();
 	return error;
 }
+
+static ssize_t loaded_show(struct kobject *kobj,
+				 struct kobj_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%d\n", !!kexec_image);
+}
+static struct kobj_attribute loaded_attr = __ATTR_RO(loaded);
+
+#ifdef CONFIG_CRASH_DUMP
+static ssize_t crash_loaded_show(struct kobject *kobj,
+				       struct kobj_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%d\n", kexec_crash_loaded());
+}
+static struct kobj_attribute crash_loaded_attr = __ATTR_RO(crash_loaded);
+
+static ssize_t crash_size_show(struct kobject *kobj,
+				       struct kobj_attribute *attr, char *buf)
+{
+	ssize_t size = crash_get_memory_size();
+
+	if (size < 0)
+		return size;
+
+	return sysfs_emit(buf, "%zd\n", size);
+}
+static ssize_t crash_size_store(struct kobject *kobj,
+				struct kobj_attribute *attr,
+				const char *buf, size_t count)
+{
+	unsigned long cnt;
+	int ret;
+
+	if (kstrtoul(buf, 0, &cnt))
+		return -EINVAL;
+
+	ret = crash_shrink_memory(cnt);
+	return ret < 0 ? ret : count;
+}
+static struct kobj_attribute crash_size_attr = __ATTR_RW(crash_size);
+
+#ifdef CONFIG_CRASH_HOTPLUG
+static ssize_t crash_elfcorehdr_size_show(struct kobject *kobj,
+			       struct kobj_attribute *attr, char *buf)
+{
+	unsigned int sz = crash_get_elfcorehdr_size();
+
+	return sysfs_emit(buf, "%u\n", sz);
+}
+static struct kobj_attribute crash_elfcorehdr_size_attr = __ATTR_RO(crash_elfcorehdr_size);
+
+#endif /* CONFIG_CRASH_HOTPLUG */
+#endif /* CONFIG_CRASH_DUMP */
+
+static struct attribute *kexec_attrs[] = {
+	&loaded_attr.attr,
+#ifdef CONFIG_CRASH_DUMP
+	&crash_loaded_attr.attr,
+	&crash_size_attr.attr,
+#ifdef CONFIG_CRASH_HOTPLUG
+	&crash_elfcorehdr_size_attr.attr,
+#endif
+#endif
+	NULL
+};
+
+struct kexec_link_entry {
+	const char *target;
+	const char *name;
+};
+
+static struct kexec_link_entry kexec_links[] = {
+	{ "loaded", "kexec_loaded" },
+#ifdef CONFIG_CRASH_DUMP
+	{ "crash_loaded", "kexec_crash_loaded" },
+	{ "crash_size", "kexec_crash_size" },
+#ifdef CONFIG_CRASH_HOTPLUG
+	{ "crash_elfcorehdr_size", "crash_elfcorehdr_size" },
+#endif
+#endif
+
+};
+
+struct kobject *kexec_kobj;
+ATTRIBUTE_GROUPS(kexec);
+
+static int __init init_kexec_sysctl(void)
+{
+	int error;
+	int i;
+
+	kexec_kobj = kobject_create_and_add("kexec", kernel_kobj);
+	if (!kexec_kobj) {
+		pr_err("failed to create kexec kobject\n");
+		return -ENOMEM;
+	}
+
+	error = sysfs_create_groups(kexec_kobj, kexec_groups);
+	if (error)
+		goto kset_exit;
+
+	for (i = 0; i < ARRAY_SIZE(kexec_links); i++) {
+		error = compat_only_sysfs_link_entry_to_kobj(kernel_kobj, kexec_kobj,
+							     kexec_links[i].target,
+							     kexec_links[i].name);
+		if (error)
+			pr_err("Unable to create %s symlink (%d)", kexec_links[i].name, error);
+	}
+
+	return 0;
+
+kset_exit:
+	kobject_put(kexec_kobj);
+	return error;
+}
+
+subsys_initcall(init_kexec_sysctl);
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index eefb67d9883c..a9e6354d9e25 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -12,7 +12,7 @@
 #include <linux/sysfs.h>
 #include <linux/export.h>
 #include <linux/init.h>
-#include <linux/kexec.h>
+#include <linux/vmcore_info.h>
 #include <linux/profile.h>
 #include <linux/stat.h>
 #include <linux/sched.h>
@@ -119,50 +119,6 @@ static ssize_t profiling_store(struct kobject *kobj,
 KERNEL_ATTR_RW(profiling);
 #endif
 
-#ifdef CONFIG_KEXEC_CORE
-static ssize_t kexec_loaded_show(struct kobject *kobj,
-				 struct kobj_attribute *attr, char *buf)
-{
-	return sysfs_emit(buf, "%d\n", !!kexec_image);
-}
-KERNEL_ATTR_RO(kexec_loaded);
-
-#ifdef CONFIG_CRASH_DUMP
-static ssize_t kexec_crash_loaded_show(struct kobject *kobj,
-				       struct kobj_attribute *attr, char *buf)
-{
-	return sysfs_emit(buf, "%d\n", kexec_crash_loaded());
-}
-KERNEL_ATTR_RO(kexec_crash_loaded);
-
-static ssize_t kexec_crash_size_show(struct kobject *kobj,
-				       struct kobj_attribute *attr, char *buf)
-{
-	ssize_t size = crash_get_memory_size();
-
-	if (size < 0)
-		return size;
-
-	return sysfs_emit(buf, "%zd\n", size);
-}
-static ssize_t kexec_crash_size_store(struct kobject *kobj,
-				   struct kobj_attribute *attr,
-				   const char *buf, size_t count)
-{
-	unsigned long cnt;
-	int ret;
-
-	if (kstrtoul(buf, 0, &cnt))
-		return -EINVAL;
-
-	ret = crash_shrink_memory(cnt);
-	return ret < 0 ? ret : count;
-}
-KERNEL_ATTR_RW(kexec_crash_size);
-
-#endif /* CONFIG_CRASH_DUMP*/
-#endif /* CONFIG_KEXEC_CORE */
-
 #ifdef CONFIG_VMCORE_INFO
 
 static ssize_t vmcoreinfo_show(struct kobject *kobj,
@@ -174,18 +130,6 @@ static ssize_t vmcoreinfo_show(struct kobject *kobj,
 }
 KERNEL_ATTR_RO(vmcoreinfo);
 
-#ifdef CONFIG_CRASH_HOTPLUG
-static ssize_t crash_elfcorehdr_size_show(struct kobject *kobj,
-			       struct kobj_attribute *attr, char *buf)
-{
-	unsigned int sz = crash_get_elfcorehdr_size();
-
-	return sysfs_emit(buf, "%u\n", sz);
-}
-KERNEL_ATTR_RO(crash_elfcorehdr_size);
-
-#endif
-
 #endif /* CONFIG_VMCORE_INFO */
 
 /* whether file capabilities are enabled */
@@ -255,18 +199,8 @@ static struct attribute * kernel_attrs[] = {
 #ifdef CONFIG_PROFILING
 	&profiling_attr.attr,
 #endif
-#ifdef CONFIG_KEXEC_CORE
-	&kexec_loaded_attr.attr,
-#ifdef CONFIG_CRASH_DUMP
-	&kexec_crash_loaded_attr.attr,
-	&kexec_crash_size_attr.attr,
-#endif
-#endif
 #ifdef CONFIG_VMCORE_INFO
 	&vmcoreinfo_attr.attr,
-#ifdef CONFIG_CRASH_HOTPLUG
-	&crash_elfcorehdr_size_attr.attr,
-#endif
 #endif
 #ifndef CONFIG_TINY_RCU
 	&rcu_expedited_attr.attr,
-- 
2.51.0

Re: [PATCH v2 2/5] kexec: move sysfs entries to /sys/kernel/kexec

[kernel test robot]

Hi Sourabh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.18-rc4 next-20251107]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sourabh-Jain/Documentation-ABI-add-kexec-and-kdump-sysfs-interface/20251106-125243
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20251106045107.17813-3-sourabhjain%40linux.ibm.com
patch subject: [PATCH v2 2/5] kexec: move sysfs entries to /sys/kernel/kexec
config: s390-randconfig-r131-20251109 (https://download.01.org/0day-ci/archive/20251109/202511092102.Qi35GqrR-lkp@intel.com/config)
compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251109/202511092102.Qi35GqrR-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511092102.Qi35GqrR-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> kernel/kexec_core.c:1315:16: sparse: sparse: symbol 'kexec_kobj' was not declared. Should it be static?

vim +/kexec_kobj +1315 kernel/kexec_core.c

  1314	
> 1315	struct kobject *kexec_kobj;
  1316	ATTRIBUTE_GROUPS(kexec);
  1317	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH v2 3/5] Documentation/ABI: mark old kexec sysfs deprecated

[Sourabh Jain]

The previous commit ("kexec: move sysfs entries to /sys/kernel/kexec")
moved all existing kexec sysfs entries to a new location. The ABI
document is updated to include a note about the deprecation of the old
kexec sysfs entries.

The following kexec sysfs entries are deprecated:
- /sys/kernel/kexec_loaded
- /sys/kernel/kexec_crash_loaded
- /sys/kernel/kexec_crash_size
- /sys/kernel/crash_elfcorehdr_size

Cc: Aditya Gupta <adityag@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Baoquan he <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mahesh J Salgaonkar <mahesh@linux.ibm.com>
Cc: Pingfan Liu <piliu@redhat.com>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Shivang Upadhyay <shivangu@linux.ibm.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: kexec@lists.infradead.org
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
---
 .../sysfs-kernel-kexec-kdump                     | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 rename Documentation/ABI/{testing => obsolete}/sysfs-kernel-kexec-kdump (61%)

diff --git a/Documentation/ABI/testing/sysfs-kernel-kexec-kdump b/Documentation/ABI/obsolete/sysfs-kernel-kexec-kdump
similarity index 61%
rename from Documentation/ABI/testing/sysfs-kernel-kexec-kdump
rename to Documentation/ABI/obsolete/sysfs-kernel-kexec-kdump
index 96b24565b68e..96b4d41721cc 100644
--- a/Documentation/ABI/testing/sysfs-kernel-kexec-kdump
+++ b/Documentation/ABI/obsolete/sysfs-kernel-kexec-kdump
@@ -1,3 +1,19 @@
+NOTE: all the ABIs listed in this file are deprecated and will be removed after 2028.
+
+Here are the alternative ABIs:
++------------------------------------+-----------------------------------------+
+| Deprecated                         | Alternative                             |
++------------------------------------+-----------------------------------------+
+| /sys/kernel/kexec_loaded           | /sys/kernel/kexec/loaded                |
++------------------------------------+-----------------------------------------+
+| /sys/kernel/kexec_crash_loaded     | /sys/kernel/kexec/crash_loaded          |
++------------------------------------+-----------------------------------------+
+| /sys/kernel/kexec_crash_size       | /sys/kernel/kexec/crash_size            |
++------------------------------------+-----------------------------------------+
+| /sys/kernel/crash_elfcorehdr_size  | /sys/kernel/kexec/crash_elfcorehdr_size |
++------------------------------------+-----------------------------------------+
+
+
 What:		/sys/kernel/kexec_loaded
 Date:		Jun 2006
 Contact:	kexec@lists.infradead.org
-- 
2.51.0

[PATCH v2 4/5] kexec: document new kexec and kdump sysfs ABIs

[Sourabh Jain]

Add an ABI document for following kexec and kdump sysfs interface:

- /sys/kernel/kexec/loaded
- /sys/kernel/kexec/crash_loaded
- /sys/kernel/kexec/crash_size
- /sys/kernel/kexec/crash_elfcorehdr_size

Cc: Aditya Gupta <adityag@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Baoquan he <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mahesh J Salgaonkar <mahesh@linux.ibm.com>
Cc: Pingfan Liu <piliu@redhat.com>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Shivang Upadhyay <shivangu@linux.ibm.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: kexec@lists.infradead.org
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
---
 .../ABI/testing/sysfs-kernel-kexec-kdump      | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-kernel-kexec-kdump

diff --git a/Documentation/ABI/testing/sysfs-kernel-kexec-kdump b/Documentation/ABI/testing/sysfs-kernel-kexec-kdump
new file mode 100644
index 000000000000..00c00f380fea
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-kernel-kexec-kdump
@@ -0,0 +1,51 @@
+What:		/sys/kernel/kexec/*
+Date:		Nov 2025
+Contact:	kexec@lists.infradead.org
+Description:
+		The /sys/kernel/kexec/* directory contains sysfs files
+		that provide information about the configuration status
+		of kexec and kdump.
+
+What:		/sys/kernel/kexec/loaded
+Date:		Nov 2025
+Contact:	kexec@lists.infradead.org
+Description:	read only
+		Indicates whether a new kernel image has been loaded
+		into memory using the kexec system call. It shows 1 if
+		a kexec image is present and ready to boot, or 0 if none
+		is loaded.
+User:		kexec tools, kdump service
+
+What:		/sys/kernel/kexec/crash_loaded
+Date:		Nov 2025
+Contact:	kexec@lists.infradead.org
+Description:	read only
+		Indicates whether a crash (kdump) kernel is currently
+		loaded into memory. It shows 1 if a crash kernel has been
+		successfully loaded for panic handling, or 0 if no crash
+		kernel is present.
+User:		Kexec tools, Kdump service
+
+What:		/sys/kernel/kexec/crash_size
+Date:		Nov 2025
+Contact:	kexec@lists.infradead.org
+Description:	read/write
+		Shows the amount of memory reserved for loading the crash
+		(kdump) kernel. It reports the size, in bytes, of the
+		crash kernel area defined by the crashkernel= parameter.
+		This interface also allows reducing the crashkernel
+		reservation by writing a smaller value, and the reclaimed
+		space is added back to the system RAM.
+User:		Kdump service
+
+What:		/sys/kernel/kexec/crash_elfcorehdr_size
+Date:		Nov 2025
+Contact:	kexec@lists.infradead.org
+Description:	read only
+		Indicates the preferred size of the memory buffer for the
+		ELF core header used by the crash (kdump) kernel. It defines
+		how much space is needed to hold metadata about the crashed
+		system, including CPU and memory information. This information
+		is used by the user space utility kexec to support updating the
+		in-kernel kdump image during hotplug operations.
+User:		Kexec tools
-- 
2.51.0

[PATCH v2 5/5] crash: export crashkernel CMA reservation to userspace

[Sourabh Jain]

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 <adityag@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Baoquan he <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mahesh J Salgaonkar <mahesh@linux.ibm.com>
Cc: Pingfan Liu <piliu@redhat.com>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Shivang Upadhyay <shivangu@linux.ibm.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: kexec@lists.infradead.org
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
---
 Documentation/ABI/testing/sysfs-kernel-kexec-kdump | 10 ++++++++++
 1 file changed, 10 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
-- 
2.51.0

Re: [PATCH v2 5/5] crash: export crashkernel CMA reservation to userspace

[Sourabh Jain]

On 06/11/25 10:21, Sourabh Jain wrote:
> 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 <adityag@linux.ibm.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Baoquan he <bhe@redhat.com>
> Cc: Dave Young <dyoung@redhat.com>
> Cc: Hari Bathini <hbathini@linux.ibm.com>
> Cc: Jiri Bohac <jbohac@suse.cz>
> Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
> Cc: Mahesh J Salgaonkar <mahesh@linux.ibm.com>
> Cc: Pingfan Liu <piliu@redhat.com>
> Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
> Cc: Shivang Upadhyay <shivangu@linux.ibm.com>
> Cc: Vivek Goyal <vgoyal@redhat.com>
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: kexec@lists.infradead.org
> Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
> ---
>   Documentation/ABI/testing/sysfs-kernel-kexec-kdump | 10 ++++++++++
>   1 file changed, 10 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
While rebasing the v1 patches, the hunk that adds the show function 
didn't get picked up.
I will send v3 with a show function to export the crashkernel CMA 
reservation.

- Sourabh Jain