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

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Message-ID: <20251106045107.17813-6-sourabhjain@linux.ibm.com>
Date: Thu,  6 Nov 2025 10:21:07 +0530
From: Sourabh Jain <sourabhjain@...ux.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: Sourabh Jain <sourabhjain@...ux.ibm.com>,
        Aditya Gupta <adityag@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>, Baoquan he <bhe@...hat.com>,
        Dave Young <dyoung@...hat.com>, Hari Bathini <hbathini@...ux.ibm.com>,
        Jiri Bohac <jbohac@...e.cz>, Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        Pingfan Liu <piliu@...hat.com>,
        "Ritesh Harjani (IBM)" <ritesh.list@...il.com>,
        Shivang Upadhyay <shivangu@...ux.ibm.com>,
        Vivek Goyal <vgoyal@...hat.com>, linuxppc-dev@...ts.ozlabs.org,
        kexec@...ts.infradead.org
Subject: [PATCH v2 5/5] crash: export crashkernel CMA reservation to userspace

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@...ux.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Baoquan he <bhe@...hat.com>
Cc: Dave Young <dyoung@...hat.com>
Cc: Hari Bathini <hbathini@...ux.ibm.com>
Cc: Jiri Bohac <jbohac@...e.cz>
Cc: Madhavan Srinivasan <maddy@...ux.ibm.com>
Cc: Mahesh J Salgaonkar <mahesh@...ux.ibm.com>
Cc: Pingfan Liu <piliu@...hat.com>
Cc: Ritesh Harjani (IBM) <ritesh.list@...il.com>
Cc: Shivang Upadhyay <shivangu@...ux.ibm.com>
Cc: Vivek Goyal <vgoyal@...hat.com>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: kexec@...ts.infradead.org
Signed-off-by: Sourabh Jain <sourabhjain@...ux.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@...ts.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