linux-kernel - Re: [PATCH v2 0/4] x86/boot: Remove runtime relocations from compressed kernel

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Message-ID: <CA+icZUV2fvwQTnzUmWCiv4unzFb7HjUSTrYgHeYd0dgFi=oLMw@mail.gmail.com>
Date:   Tue, 26 May 2020 18:18:07 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Fangrui Song <maskray@...gle.com>,
        Dmitry Golovin <dima@...ovin.in>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] x86/boot: Remove runtime relocations from
 compressed kernel

On Tue, May 26, 2020 at 5:07 PM Sedat Dilek <sedat.dilek@...il.com> wrote:

...

> > > patchset to previous build:
> > >
> > > $ git log --no-merges --oneline 5.7.0-rc7-1-amd64-clang..5.7.0-rc7-2-amd64-clang
> > > 8b74901cb9e5 (for-5.7/x86-boot-remove-runtime-relocations-from-compressed-kernel-v2-nivedita76)
> > > x86/boot: Check that there are no runtime relocations
> > > 83fb1bc3b076 x86/boot: Remove runtime relocations from head_{32,64}.S
> > > fede23dacbbd x86/boot: Remove run-time relocations from .head.text code
> > > 3e5ea481b8fb x86/boot: Add .text.* to setup.ld
> > > bec910ba3d67 x86/boot/compressed: Get rid of GOT fixup code
> > > be834cee6f39 x86/boot/compressed: Force hidden visibility for all
> > > symbol references
> > > 9b7c7d8d2d7b x86/boot/compressed: Move .got.plt entries out of the .got section
> > > ba6a49f806a0 (for-5.7/kbuild-compressed-debug-info) Makefile: support
> > > compressed debug info
> > > a1fb11944d11 (for-5.7/x86-boot-nivedita76) x86/boot: Correct
> > > relocation destination on old linkers
> > > c70e3890058f (for-5.7/x86-build-maskray) x86/boot: Discard
> > > .discard.unreachable for arch/x86/boot/compressed/vmlinux

...

> This works:
>
> [ arch/x86/boot/compressed/Makefile ]
>
> -KBUILD_CFLAGS += -include hidden.h
> +KBUILD_CFLAGS += -include ./arch/x86/boot/compressed/hidden.h
>
> $ ll arch/x86/boot/bzImage arch/x86/boot/compressed/vmlinux
> -rw-r--r-- 1 dileks dileks 6,5M Mai 26 17:05 arch/x86/boot/bzImage
> -rwxr-xr-x 1 dileks dileks 6,5M Mai 26 17:05 arch/x86/boot/compressed/vmlinux
>

I was able to build/link and boot on bare metal.

root@...za:~# cat /proc/version
Linux version 5.7.0-rc7-2-amd64-clang (sedat.dilek@...il.com@...za)
(clang version 10.0.1rc1, LLD 10.0.1rc1) #2~bullseye+dileks1 SMP
2020-05-26

- Sedat -