linux-kernel - [PATCH 0/3] x86 disk image and modules initramfs generation

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Date:   Mon, 19 Apr 2021 13:54:35 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kbuild Mailing List <linux-kbuild@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 0/3] x86 disk image and modules initramfs generation

From: "H. Peter Anvin" (Intel) <hpa@...or.com>

When compiling on a different machine than the runtime target,
including but not limited to simulators, it is rather handy to be able
to produce a bootable image. The scripts for that in x86 are
relatively old, and assume a BIOS system.

This adds a build target to generate a hdimage which can be booted
either from BIOS or EFI, and modernizes the genimage.sh script
including adding the ability to add an arbitrary number of initramfs
files (limited only by the length of the command line.)

Possibly more controversial, at least from a Kbuild design perspective
(as usual I'm the guy who wants to do something with Kbuild which it
seems it was never really designed to do), is add the ability to
create an initramfs image which includes all the built modules. Some
distributions cannot be easily booted without modules in initramfs,
and this creates an image which can be added to initramfs to provide
the kernel modules, as finalized by "make modules_install".

The final patch put these two together, and allows the modules
initramfs to be included in the x86 boot image.

 Makefile                     |  17 ++-
 arch/x86/Makefile            |   8 +-
 arch/x86/boot/.gitignore     |   1 +
 arch/x86/boot/Makefile       |  55 +++++----
 arch/x86/boot/genimage.sh    | 284 +++++++++++++++++++++++++++++++------------
 arch/x86/boot/mtools.conf.in |   3 +
 usr/.gitignore               |   3 +
 usr/Kconfig                  |  31 ++---
 usr/Makefile                 |  39 +++++-
 9 files changed, 318 insertions(+), 123 deletions(-)