From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-183.mta1.migadu.com (out-183.mta1.migadu.com [95.215.58.183]) (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 A5C132C11DD for ; Wed, 20 Aug 2025 05:57:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.183 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755669461; cv=none; b=gk5UiynbyJGR0Yrl05DXUOQkPgFEFIem7mWZbZEt6SFS4VYNawO5kx0BY9TYr/gximwk8jWKRORGP4dh2w9qZTK1yNQCAm4h4AV1dco5P48rLq06QHvu4rLN4H21HekRyCZKreIULpKddNug0JUMwWNC61wE2fmnn402VTQYufk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755669461; c=relaxed/simple; bh=5WVSSBW/HOjzUzX3mU5w5ItKnTvEL+AwWRxnfZ9paXY=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=bcnbZ+9MfJO0duoFlbJxZI6l+sreLrW6UiuYdWyWg2hWKcYemSQ03nAl7HtFKK2OHouEQhW7OftIfVgIp63sGbfDdlS+keYzTGknHrQrUk1T2KcNN1K40t6VX8BV3Alg98GIEmUfFP1CcZ7Xc4J5qtt0Ja1J0w4JWB+HT4JzdRE= 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=AEh2Np3O; arc=none smtp.client-ip=95.215.58.183 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="AEh2Np3O" 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=1755669447; 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=IX26plY5Uf29k5UnA4HhqtwDMo5fxBKoNIkZeiD/EKE=; b=AEh2Np3Oz59nRp6/JITqRY8s8f8om5cxv0JtivD/ElFl6AgojeMV5ozdg6pMHUmeDwofC8 FvnqQpIgkN+EPUWW0LVcjaWFrKzos/SchN+hfv+yGxZzXh2Jbiuvc+VZHIYS0wY4OWFzZJ TAOaUH+mBqNs72xkVDJkKoCJ1agSHx0= 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 v2 0/5] Add kexec_file support for LoongArch Date: Wed, 20 Aug 2025 13:56:55 +0800 Message-Id: <20250820055700.24344-1-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: 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 (5): LoongArch: Add struct loongarch_image_header for kernel image LoongArch: Add kexec_file support 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 | 111 ++++++++++ arch/loongarch/kernel/kexec_elf.c | 105 +++++++++ arch/loongarch/kernel/machine_kexec.c | 33 ++- arch/loongarch/kernel/machine_kexec_file.c | 235 +++++++++++++++++++++ 9 files changed, 555 insertions(+), 11 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