From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-181.mta1.migadu.com (out-181.mta1.migadu.com [95.215.58.181]) (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 2ACBE2DE71E for ; Mon, 11 Aug 2025 09:28:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.181 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754904496; cv=none; b=bPM3Xw935Ogg98j5mEUlvnwKnHqqKjHdxNCEiRxdGyq+bVlIjIhrfZ/ru9A8L7owHq0P6/gYTynDIRIjxpqHsLBj8T0fzdN5MUEdcQ+z48Eo9mZjzo+Ig/hiLEqyIJGgA0Akf4FnoWhUaibshXNwif+kRAnyOVehgGJBwdVxh5g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754904496; c=relaxed/simple; bh=CG0C1SfyItXrt8ExFvXcVaNmWSYCE6+KwVwVWwt3c7Y=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=TuVL61vzjCBd/1p3JF12t9Vd0gnbl82FhCnOvAsWdd7R8M0hPNQ3fipEFUJiJDSjyElxlhrKyFEgRtR57UA8lNH/j+q3rmI5SxGDNUYVn4KSS7rRDLLsPKXOuo1NDoYWjPvwGQcNX2xj8u9+11ocoexgMZn7qJc0KrciGQodezY= 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=FBkchM+o; arc=none smtp.client-ip=95.215.58.181 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="FBkchM+o" 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=1754904491; 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=mn6yGCgIfkqUqRIzMPkZRCyDdMUzEhApvE49oVqcvo0=; b=FBkchM+oKFunptI/GonLa8A971t0vOUJRpSTuUu1uo3GD5p/4CJaRBj3DOaSI+upBgQjI1 0kRrxqpEG1a1PyQwR3GxtXFAroLuvQyOAsNJUexLT72W2BwtQL3kb3raTMXH8nWm8/btDR OeW3oQyHT9ieBvmxlunj/quxeNvbQVw= From: Youling Tang To: Huacai Chen Cc: WANG Xuerui , Baoquan He , kexec@lists.infradead.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, youling.tang@linux.dev, Youling Tang Subject: [PATCH 0/6] Add kexec_file support for LoongArch Date: Mon, 11 Aug 2025 17:26:53 +0800 Message-Id: <20250811092659.14903-1-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 or vmlinux.efi 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/ Youling Tang (6): LoongArch: Add struct loongarch_image_header for kernel image LoongArch: Add kexec_file support LoongArch/kexec_file: Add initrd loading LoongArch/kexec_file: Add crash dump support LoongArch/kexec_file: Add "mem" parameter to limit memory usage of kdump kernel LoongArch: Enable CONFIG_KEXEC_FILE arch/loongarch/Kconfig | 8 + arch/loongarch/configs/loongson3_defconfig | 1 + arch/loongarch/include/asm/image.h | 58 +++++ arch/loongarch/include/asm/kexec.h | 12 ++ arch/loongarch/kernel/Makefile | 1 + arch/loongarch/kernel/kexec_image.c | 112 ++++++++++ arch/loongarch/kernel/machine_kexec.c | 33 ++- arch/loongarch/kernel/machine_kexec_file.c | 234 +++++++++++++++++++++ 8 files changed, 448 insertions(+), 11 deletions(-) create mode 100644 arch/loongarch/include/asm/image.h create mode 100644 arch/loongarch/kernel/kexec_image.c create mode 100644 arch/loongarch/kernel/machine_kexec_file.c -- 2.34.1