From patchwork Wed Feb 1 06:38:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sourabh Jain X-Patchwork-Id: 1735370 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=Ejxb4Bsu; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4P6C545s5Nz23j9 for ; Wed, 1 Feb 2023 17:42:00 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4P6C544f6Wz3f3x for ; Wed, 1 Feb 2023 17:42:00 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=Ejxb4Bsu; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from gandalf.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4P6C1m0pxvz3cfl for ; Wed, 1 Feb 2023 17:39:08 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=Ejxb4Bsu; dkim-atps=neutral Received: from gandalf.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4P6C1m0Phqz4x1f for ; Wed, 1 Feb 2023 17:39:08 +1100 (AEDT) Received: by gandalf.ozlabs.org (Postfix) id 4P6C1m0Jz2z4xyd; Wed, 1 Feb 2023 17:39:08 +1100 (AEDT) Delivered-To: linuxppc-dev@ozlabs.org Authentication-Results: gandalf.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: gandalf.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com; envelope-from=sourabhjain@linux.ibm.com; receiver=) Authentication-Results: gandalf.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=Ejxb4Bsu; dkim-atps=neutral Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by gandalf.ozlabs.org (Postfix) with ESMTPS id 4P6C1l4R57z4x1f for ; Wed, 1 Feb 2023 17:39:07 +1100 (AEDT) Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3116W1Xn011706; Wed, 1 Feb 2023 06:38:58 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=MWrrAhNQnf5rNd5GpBWkPYS6Z/b/2OekecHK+zL225I=; b=Ejxb4BsuPTbbGCOJZYiX/qFvoT+XrOjNIfZD7BICkdme91KhCNLncl9CD8Pg7Eb7b0j6 1qeyGbdbAkp413sK3OlnqaAIE8tuuDRqPue7Ie0bT12Kb/O1LFw+ZepNt+loFQd7RzO+ ScDPaRQc+cvhj6uq6GoWlv6tSsf1cNdk+KS+rf1/clH0jND20/kstSK8z3ClkmlsphIP sNnmHcA2+9boDKn3N0xicN8HYtECe98DSnFqh+GoLRw90k3/noukfCvVRSKMw9HAqgBv Vuz9M3V+32k05WAITrAFzoK6D2qtycpM03lFN+R9LjJMWej6UENKQl/LQGuy18VyOH31 qg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com (PPS) with ESMTPS id 3nfjw7g5nn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Feb 2023 06:38:58 +0000 Received: from m0098419.ppops.net (m0098419.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3116anXG028951; Wed, 1 Feb 2023 06:38:58 GMT Received: from ppma06fra.de.ibm.com (48.49.7a9f.ip4.static.sl-reverse.com [159.122.73.72]) by mx0b-001b2d01.pphosted.com (PPS) with ESMTPS id 3nfjw7g5kc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Feb 2023 06:38:57 +0000 Received: from pps.filterd (ppma06fra.de.ibm.com [127.0.0.1]) by ppma06fra.de.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 3115nufh007694; Wed, 1 Feb 2023 06:38:56 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma06fra.de.ibm.com (PPS) with ESMTPS id 3ncvugk5np-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 01 Feb 2023 06:38:56 +0000 Received: from smtpav04.fra02v.mail.ibm.com (smtpav04.fra02v.mail.ibm.com [10.20.54.103]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 3116cqkM47972862 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 1 Feb 2023 06:38:52 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7C90E2004B; Wed, 1 Feb 2023 06:38:52 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 889DA20040; Wed, 1 Feb 2023 06:38:50 +0000 (GMT) Received: from li-4f5ba44c-27d4-11b2-a85c-a08f5b49eada.ibm.com.com (unknown [9.43.109.52]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 1 Feb 2023 06:38:50 +0000 (GMT) From: Sourabh Jain To: linuxppc-dev@ozlabs.org, mpe@ellerman.id.au Subject: [PATCH v8 4/8] crash: add phdr for possible CPUs in elfcorehdr Date: Wed, 1 Feb 2023 12:08:37 +0530 Message-Id: <20230201063841.965316-5-sourabhjain@linux.ibm.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230201063841.965316-1-sourabhjain@linux.ibm.com> References: <20230201063841.965316-1-sourabhjain@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: s3tro_3Ufzmk34olfJMr8rwECy6idqel X-Proofpoint-GUID: tS8vlvwT7G-DBJrhSqYx-3URYuo1EJsu X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-02-01_02,2023-01-31_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 impostorscore=0 bulkscore=0 clxscore=1015 priorityscore=1501 mlxlogscore=999 phishscore=0 malwarescore=0 adultscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302010056 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: eric.devolder@oracle.com, bhe@redhat.com, mahesh@linux.vnet.ibm.com, kexec@lists.infradead.org, ldufour@linux.ibm.com, hbathini@linux.ibm.com Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" On architectures like PowerPC the crash notes are available for all possible CPUs. So let's populate the elfcorehdr for all possible CPUs having crash notes to avoid updating elfcorehdr during in-kernel crash update on CPU hotplug events. The similar technique is used in kexec-tool for kexec_load case. Signed-off-by: Sourabh Jain --- kernel/crash_core.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/kernel/crash_core.c b/kernel/crash_core.c index 37c594858fd51..898d8d2fe2e2e 100644 --- a/kernel/crash_core.c +++ b/kernel/crash_core.c @@ -364,8 +364,8 @@ int crash_prepare_elf64_headers(struct kimage *image, struct crash_mem *mem, ehdr->e_ehsize = sizeof(Elf64_Ehdr); ehdr->e_phentsize = sizeof(Elf64_Phdr); - /* Prepare one phdr of type PT_NOTE for each present CPU */ - for_each_present_cpu(cpu) { + /* Prepare one phdr of type PT_NOTE for possible CPU with crash note. */ + for_each_possible_cpu(cpu) { #ifdef CONFIG_CRASH_HOTPLUG if (IS_ENABLED(CONFIG_HOTPLUG_CPU)) { /* Skip the soon-to-be offlined cpu */ @@ -373,8 +373,11 @@ int crash_prepare_elf64_headers(struct kimage *image, struct crash_mem *mem, continue; } #endif - phdr->p_type = PT_NOTE; notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu)); + if (!notes_addr) + continue; + + phdr->p_type = PT_NOTE; phdr->p_offset = phdr->p_paddr = notes_addr; phdr->p_filesz = phdr->p_memsz = sizeof(note_buf_t); (ehdr->e_phnum)++;