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 00B87CA0FED for ; Wed, 3 Sep 2025 03:02:26 +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=isX+w1aFzVbrn4Ce/5g4IRvZrErGccZqzEtiZvEOUeY=; b=IoSKHCW+k71ypFF8VzAoVG7eU1 TJeUI6Y738LqO5oBQpAXZubOdrlQPBfDt64DOXwxeKhWO88ngKRKLPKA9VDAYcVAMc1B00t2piwTM SA0Fo8N23Nz8U7B83WEEzkJJUhrueLf/3QyPxbOTg/PT4LwqpCujhtkp4EWRmFhRuz5Q2azzJE44Q JJmWLIYcbkxS45BA0/FV/VUiRIG8HDEOjcdaUyrz6G5vhpAXxi0dM/eTOw44irrv4eXNf7RhOASsr UsHG/hL5wmjd+9l1hHCG9U8kUsaNIR7lyNNmZP0ZRtf8Z6UezQSHvBPCTz1BJgvxKfEjf1R6N37yY OqH/DqJw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1utdlP-00000003Qxk-0UEF; Wed, 03 Sep 2025 03:02:23 +0000 Received: from out-171.mta0.migadu.com ([2001:41d0:1004:224b::ab]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1utdlJ-00000003Qv1-2T3g for kexec@lists.infradead.org; Wed, 03 Sep 2025 03:02:19 +0000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1756868532; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=isX+w1aFzVbrn4Ce/5g4IRvZrErGccZqzEtiZvEOUeY=; b=KoprB8mxeXimFmXxZztGdBzZMgr3tlMB2BKekvN9qZ+dnvZKlU26qQSsOGfJWdq7Uw5ut9 Cf1JLuLQ2BfZ9ZrfB9D7gigjHSXQDOaWS0QXlJQHsxG1F1oCZpMsqGVR/+R7kU+LhGMxjf mbBuMsHH85j9krbvOhWwgtnlx4ir3Ao= From: Youling Tang To: Huacai Chen Cc: WANG Xuerui , Baoquan He , Yao Zi , kexec@lists.infradead.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, youling.tang@linux.dev, Youling Tang Subject: [PATCH v4 0/7] Add kexec_file support for LoongArch Date: Wed, 3 Sep 2025 11:00:53 +0800 Message-Id: <20250903030100.196744-1-youling.tang@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250902_200217_837794_319E59BF X-CRM114-Status: GOOD ( 12.50 ) 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 From: Youling Tang This patchset implement kexec_file_load() support on LoongArch. This patch series enables us to load the LoongArch vmlinuz.efi(pez) or vmlinux.efi(pei) or vmlinux(elf) by specifying its file decriptor, instead of user-filled buffer via kexec_load() syscall. To use kexec_file_load() system call, instead of kexec_load(), at kexec command, '-s' options must be specified. kexec-tools needs to apply the corresponding patches. These patches can be found in repository [1] and will be submitted to the kexec-tools community later. The basic usage of kexec_file is: 1) Load second kernel image: # kexec -s -l vmlinuz.efi --initrd=initrd.img --reuse-cmdline 2) Startup second kernel: # kexec -e For kdump: 1) Load capture kernel image: # kexec -s -p vmlinuz.efi --initrd=initrd.img --reuse-cmdline 2) Do something to crash, like: # echo c > /proc/sysrq-trigger Link: [1] https://github.com/tangyouling/kexec-tools/commits/main/ Changelog: v4: * Add the character "kexec_file" to the command-line parameter. * Fixed the issue where kexec_file failed to load the KASLR kernel startup. * Modify the member name of the loongarch_image_header structure. * Modify the patch commit message. v3: * The ELF format kernel loading should not use loongarch_image_header. * Separate patch2 into an infrastructure patch and an EFI support patch. * Adding that kexec_file cannot load non-relocation kernel comments. * Some minor modifications. v2: * Merge some patches. * Add support for ELF format images. * Rename kexec_image.c to kexec_efi.c . * When KEXEC_FILE is enabled, RELOCATABLE is selected by default. * Some minor modifications. Youling Tang (7): LoongArch: Add struct loongarch_image_header for kernel image LoongArch: Add preparatory infrastructure for kexec_file LoongArch/kexec_file: Support loading EFI binary file LoongArch/kexec_file: Support loading ELF binary file LoongArch/kexec_file: Add crash dump support LoongArch: Automatically disable kaslr when the kernel loads from kexec_file LoongArch: Enable CONFIG_KEXEC_FILE arch/loongarch/Kconfig | 10 + arch/loongarch/configs/loongson3_defconfig | 1 + arch/loongarch/include/asm/image.h | 53 +++++ arch/loongarch/include/asm/kexec.h | 13 ++ arch/loongarch/kernel/Makefile | 1 + arch/loongarch/kernel/kexec_efi.c | 114 ++++++++++ arch/loongarch/kernel/kexec_elf.c | 105 +++++++++ arch/loongarch/kernel/machine_kexec.c | 37 ++-- arch/loongarch/kernel/machine_kexec_file.c | 244 +++++++++++++++++++++ arch/loongarch/kernel/relocate.c | 4 + 10 files changed, 569 insertions(+), 13 deletions(-) create mode 100644 arch/loongarch/include/asm/image.h create mode 100644 arch/loongarch/kernel/kexec_efi.c create mode 100644 arch/loongarch/kernel/kexec_elf.c create mode 100644 arch/loongarch/kernel/machine_kexec_file.c -- 2.43.0