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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 089D8CEACEF for ; Mon, 17 Nov 2025 03:52:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=TTIkmuHYIMKfZaYrHE3ln/Ch7TvaOt4dh1CyfzrBu+g=; b=xkRxZIq4E5WqOP4avFlZkxf+FW /3r8elAP7o0Ws+kzogBXjOngmGm3GpFtQPoUrtovcA+fsWTF6+JsrzUVQx0myHBgOdt/I+CqjQURY VNfQXivdn62MEAVgymruiOHaxQVnWsTbbXa1FeRUP3vZwsAelE/cYZC5Ttd0u5MSEpJn56kbzssv4 UXp+y4olPJaIFMff/uFVKn9EzqsP3At6aRnMVS286YvjF74JKHG6I3glf1lzECzxC6FEVZJYLMaVB 4MNMKA3IdsTrtLPvR0n5gTaSREotlg/B0DQGt0EfnEcfY8ICzDIsd7Py7Ct1hTtGCwK7p8YclmGzP IcTshTww==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vKqHm-0000000FOVk-3GIs; Mon, 17 Nov 2025 03:52:14 +0000 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vKqHj-0000000FOVE-0t6u for kexec@lists.infradead.org; Mon, 17 Nov 2025 03:52:13 +0000 Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 5AGKF41k004244; Mon, 17 Nov 2025 03:52:07 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:message-id:mime-version :subject:to; s=pp1; bh=TTIkmuHYIMKfZaYrHE3ln/Ch7TvaOt4dh1CyfzrBu +g=; b=FetZSFBTwMkweKOm1Ww/1jr3lRa7/ffSJ4mDmTsfc9/RV/ojmkBgJm5lK /85fXZPxKrDUFBxHl+fSsZ6avhV7OoSDMcVtdE1Unmvt3CF6n045r3s1k/um5kw0 zwGcEbVYUk1I4Q0PJSLNoHKR7QIM6WTxUBq/JaT44IJm7WwtBbWKWgCa3SWIKN1q gpqKlWxplPdZs8uPSh6j4Mlze9tLPV3lQEFN5u2mtFJbXscKHsqdJOiqefj5rUM4 faquO6UORLPyN5JLa7Bm/vqwVSgkBUhFc7+TGipkPp3HWwu2941WDIFyr7Wr5Smp NiR22sYzGzjcCC4KlMQ9SfYDwBMug== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4aejgwm7fc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Nov 2025 03:52:07 +0000 (GMT) Received: from m0356516.ppops.net (m0356516.ppops.net [127.0.0.1]) by pps.reinject (8.18.1.12/8.18.0.8) with ESMTP id 5AH3mLBB011571; Mon, 17 Nov 2025 03:52:06 GMT Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4aejgwm7fb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Nov 2025 03:52:06 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 5AGMiBjk017319; Mon, 17 Nov 2025 03:52:06 GMT Received: from smtprelay07.fra02v.mail.ibm.com ([9.218.2.229]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 4af6j1bhy1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 17 Nov 2025 03:52:06 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay07.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 5AH3q2d141615782 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 17 Nov 2025 03:52:02 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 29EE620043; Mon, 17 Nov 2025 03:52:02 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F2B2120040; Mon, 17 Nov 2025 03:51:58 +0000 (GMT) Received: from li-4f5ba44c-27d4-11b2-a85c-a08f5b49eada.in.ibm.com (unknown [9.109.204.116]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 17 Nov 2025 03:51:58 +0000 (GMT) From: Sourabh Jain To: linux-kernel@vger.kernel.org Cc: Sourabh Jain , Aditya Gupta , Andrew Morton , Baoquan he , Dave Young , Hari Bathini , Jiri Bohac , Madhavan Srinivasan , Mahesh J Salgaonkar , Pingfan Liu , "Ritesh Harjani (IBM)" , Shivang Upadhyay , Vivek Goyal , linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org Subject: [PATCH v5] Documentation/ABI: add kexec and kdump sysfs interface Date: Mon, 17 Nov 2025 09:21:53 +0530 Message-ID: <20251117035153.1199665-1-sourabhjain@linux.ibm.com> X-Mailer: git-send-email 2.51.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: h9tTWo7n7MYJUtvpOtn6WE5fDQF-PNVP X-Authority-Analysis: v=2.4 cv=YqwChoYX c=1 sm=1 tr=0 ts=691a9be7 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=Z4Rwk6OoAAAA:8 a=VnNF1IyMAAAA:8 a=20KFwNOVAAAA:8 a=pGLkceISAAAA:8 a=voM4FWlXAAAA:8 a=JfrnYn6hAAAA:8 a=2fxpJEG2JIKmu2fkhY0A:9 a=HkZW87K1Qel5hWWM3VKY:22 a=IC2XNlieTeVoXbcui8wp:22 a=1CNFftbPRP8L7MoqJWF3:22 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-ORIG-GUID: s6hoV0Mte31BCg7ouFL7T051-h-uWZIO X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE1MDAzMiBTYWx0ZWRfX5c4H7IgA+vnF taw18GKGtsjtlyBVQrrajbuYGrEgMv9U4kd7vKpfKjzhZjhNlT2fj1OcygI6tId8RCl0No84MTR k8jpj/g6Y8tdRxz7JTw0QGCxxMkK8KXR4tuae7IVLF5ViIrMs8WHT4lDdEkrDre68OmU+aErkWy e2xtmR5S3dJkAVOSJGplL9AQerSEcDY3zkt1rlLvx+MzYsEvVhm6rLrMav3UOCuyvufoQ15yn9V dkDXjJtijhP8MOaQNtXXLO86KEL1GO1Jkkg4DLtR4C9OkBR1eihMdvLcrB1K0Ki7tBZlUYBs9ly DIguDMeM1j+0O1gkG66OAe67DqU13VeqoXKMmE9pFWdU0ujnzUH+gTqzS4DbAibPljRyc4WPXMb 2MB870vAHIUTzFmixOKBaH4kSPhTcg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-17_02,2025-11-13_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 adultscore=0 bulkscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511150032 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251116_195211_375520_0AB57B24 X-CRM114-Status: GOOD ( 21.90 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org 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 Cc: Andrew Morton Cc: Baoquan he Cc: Dave Young Cc: Hari Bathini Cc: Jiri Bohac Cc: Madhavan Srinivasan Cc: Mahesh J Salgaonkar Cc: Pingfan Liu Cc: Ritesh Harjani (IBM) Cc: Shivang Upadhyay Cc: Vivek Goyal Cc: linuxppc-dev@lists.ozlabs.org Cc: kexec@lists.infradead.org Signed-off-by: Sourabh Jain --- Changelog: v4 -> v5: https://lore.kernel.org/all/20251114152550.ac2dd5e23542f09c62defec7@linux-foundation.org/ - Splitted patch from above patch series. --- .../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 -- 2.51.1