From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-178.mta0.migadu.com (out-178.mta0.migadu.com [91.218.175.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F1EA6285075 for ; Tue, 26 Aug 2025 01:18:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756171106; cv=none; b=kNcuO9Y+744l+bxMgsASwUexPDBIkHL/NXvs4z5+Wp7ZHvbmkUaqch8vx7s56qs90kqal+1DmoqMMDEtRrrytPxqf8C6wPdMGg6fP6aHhc7wZW4PEzhcJEa6IexCrAoaoyIU3UevbeZk4e17CwupRqnnwUZaPhlF+5opvDb7hkY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756171106; c=relaxed/simple; bh=pFERUv+q1Pvz6t8Bjs/RczTmneUUEdtrsHsfMjbdmII=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=NJhFZTFIBhC0yZL0IQJk3/7UuFkTe14IDtcnTOxqdMWM/YhrcxNRrIAxn9SCzmOXynKP66PG96ZUFr9TKNEHJhu6ls7kFyvPvRuVid1jlKXU60RkDNBb6s0qcqbkNVY806zBu4ZoZFZ6HNLwXArwzv7XGXM8//7ShFQWB6axkvs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=WzxTJYS3; arc=none smtp.client-ip=91.218.175.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="WzxTJYS3" 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=1756171092; 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=icSZngVaYlgp/7EJ4VaqjMZtnrg108Igob7ePxAT3/k=; b=WzxTJYS3m7yQhP551w9/Kg/ePr9rPszSJrbq63hWnz8jSZTHYCTw4ATmLzfqCyBpyRHZ1o n9Hv9lC0YbiKeUsUN9ie+RSsp8zDTeJloTZc1wGbs9tCeSZHCmLHlgLbPjoXaDY21K/SCs LlW+CDAM18EYD5nHCCrJLx7QgM7wHjc= 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 v3 0/6] Add kexec_file support for LoongArch Date: Tue, 26 Aug 2025 09:17:16 +0800 Message-Id: <20250826011722.82391-1-youling.tang@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT 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: 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 (6): 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: Enable CONFIG_KEXEC_FILE arch/loongarch/Kconfig | 10 + arch/loongarch/configs/loongson3_defconfig | 1 + arch/loongarch/include/asm/image.h | 57 +++++ 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 | 235 +++++++++++++++++++++ 9 files changed, 560 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