Re: [PATCH 00/17] Add kexec_file_load support to s390

[Dave Young <dyoung@redhat.com>]

Hi Philipp,

I added AKASHI in cc, he posted arm64 kexec_file series previously.
I would like to read both series especially the general part, but
maybe at the end of this month because of a holiday..

From the patch log the cleanup looks nice, but still need read the
details.

On 02/12/18 at 11:07am, Philipp Rudo wrote:
> Hi everybody
> 
> resending the series as there was no reaction, yet. Furthermore i was told
> that Andrew and the x86 list should also be CCed, so welcome.
> 
> No changes made to the patches since first time i sent them. The patches
> apply to the current master (v4.16-rc1).
> 
> Thanks
> Philipp
> 
> ---
> 
> this series adds the kexec_file_load system call to s390. Before the system
> call is added there are some preparations/clean ups to common
> kexec_file_load. In detail this series contains:
> 
> Patch #1&2: Minor cleanups/fixes.
> 
> Patch #3-9: Clean up the purgatory load/relocation code. Especially remove
> the mis-use of the purgatory_info->sechdrs->sh_offset field, currently
> holding a pointer into either kexec_purgatory (ro) or purgatory_buf (rw)
> depending on the section. With these patches the section address will be
> calculated verbosely and sh_offset will contain the offset of the section
> in the stripped purgatory binary (purgatory_buf).
> 
> Patch #10: Allows architectures to set the purgaory load address. This
> patch is important for s390 as the kernel and purgatory have to be loaded
> to fixed addresses. In current code this is impossible as the purgatory
> load is opaque to the architecture.
> 
> Patch #11: Moves x86 purgatories sha implementation to common lib/
> directory.
> 
> Patches #12-17 finally adds the kexec_file_load system call to s390.
> 
> Please note that I had to touch arch code for x86 and power a little. In
> theory this should not change the behavior but I don't have a way to test
> it. Cross-compiling with defconfig(*) works fine for both.
> 
> Thanks
> Philipp
> 
> (*) On x86 with the orc unwinder turned off. objtool SEGFAULTs on s390...
> 
> Philipp Rudo (17):
>   kexec_file: Silence compile warnings
>   kexec_file: Remove checks in kexec_purgatory_load
>   kexec_file: Make purgatory_info->ehdr const
>   kexec_file: Search symbols in read-only kexec_purgatory
>   kexec_file: Use read-only sections in arch_kexec_apply_relocations*
>   kexec_file: Split up __kexec_load_puragory
>   kexec_file: Simplify kexec_purgatory_setup_sechdrs 1
>   kexec_file: Simplify kexec_purgatory_setup_sechdrs 2
>   kexec_file: Remove mis-use of sh_offset field
>   kexec_file: Allow archs to set purgatory load address
>   kexec_file: Move purgatories sha256 to common code
>   s390/kexec_file: Prepare setup.h for kexec_file_load
>   s390/kexec_file: Add purgatory
>   s390/kexec_file: Add kexec_file_load system call
>   s390/kexec_file: Add image loader
>   s390/kexec_file: Add crash support to image loader
>   s390/kexec_file: Add ELF loader
> 
>  arch/powerpc/kernel/kexec_elf_64.c             |   9 +-
>  arch/s390/Kbuild                               |   1 +
>  arch/s390/Kconfig                              |   4 +
>  arch/s390/include/asm/kexec.h                  |  23 ++
>  arch/s390/include/asm/purgatory.h              |  17 ++
>  arch/s390/include/asm/setup.h                  |  40 ++-
>  arch/s390/kernel/Makefile                      |   1 +
>  arch/s390/kernel/asm-offsets.c                 |   5 +
>  arch/s390/kernel/compat_wrapper.c              |   1 +
>  arch/s390/kernel/kexec_elf.c                   | 149 ++++++++++
>  arch/s390/kernel/kexec_image.c                 |  78 +++++
>  arch/s390/kernel/machine_kexec_file.c          | 291 +++++++++++++++++++
>  arch/s390/kernel/syscalls/syscall.tbl          |   1 +
>  arch/s390/purgatory/Makefile                   |  37 +++
>  arch/s390/purgatory/head.S                     | 279 ++++++++++++++++++
>  arch/s390/purgatory/purgatory.c                |  42 +++
>  arch/x86/kernel/kexec-bzimage64.c              |   8 +-
>  arch/x86/kernel/machine_kexec_64.c             |  66 ++---
>  arch/x86/purgatory/Makefile                    |   3 +
>  arch/x86/purgatory/purgatory.c                 |   2 +-
>  include/linux/kexec.h                          |  38 +--
>  {arch/x86/purgatory => include/linux}/sha256.h |  10 +-
>  kernel/kexec_file.c                            | 375 ++++++++++++-------------
>  {arch/x86/purgatory => lib}/sha256.c           |   4 +-
>  24 files changed, 1200 insertions(+), 284 deletions(-)
>  create mode 100644 arch/s390/include/asm/purgatory.h
>  create mode 100644 arch/s390/kernel/kexec_elf.c
>  create mode 100644 arch/s390/kernel/kexec_image.c
>  create mode 100644 arch/s390/kernel/machine_kexec_file.c
>  create mode 100644 arch/s390/purgatory/Makefile
>  create mode 100644 arch/s390/purgatory/head.S
>  create mode 100644 arch/s390/purgatory/purgatory.c
>  rename {arch/x86/purgatory => include/linux}/sha256.h (63%)
>  rename {arch/x86/purgatory => lib}/sha256.c (99%)
> 
> -- 
> 2.13.5
> 
> 
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Thanks
Dave