linux-kernel - Re: [PATCH v5 0/4] vmalloc kernel mapping and relocatable kernel

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Date:   Wed, 8 Jul 2020 00:21:42 -0400
From:   Alex Ghiti <alex@...ti.fr>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <Anup.Patel@....com>,
        Atish Patra <Atish.Patra@....com>,
        Zong Li <zong.li@...ive.com>, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v5 0/4] vmalloc kernel mapping and relocatable kernel

Hi Palmer,

Le 6/7/20 à 3:59 AM, Alexandre Ghiti a écrit :
> This patchset originally implemented relocatable kernel support but now
> also moves the kernel mapping into the vmalloc zone.
>                                                                                   
> The first patch explains why we need to move the kernel into vmalloc
> zone (instead of memcpying it around). That patch should ease KASLR
> implementation a lot.
>                                                                                   
> The second patch allows to build relocatable kernels but is not selected
> by default.
>                                                                                   
> The third and fourth patches take advantage of an already existing powerpc
> script that checks relocations at compile-time, and uses it for riscv.
>                                                                                   
> Changes in v5:
>    * Add "static __init" to create_kernel_page_table function as reported by
>      Kbuild test robot
>    * Add reviewed-by from Zong
>    * Rebase onto v5.7
> 
> Changes in v4:
>    * Fix BPF region that overlapped with kernel's as suggested by Zong
>    * Fix end of module region that could be larger than 2GB as suggested by Zong
>    * Fix the size of the vm area reserved for the kernel as we could lose
>      PMD_SIZE if the size was already aligned on PMD_SIZE
>    * Split compile time relocations check patch into 2 patches as suggested by Anup
>    * Applied Reviewed-by from Zong and Anup
>                                                                                   
> Changes in v3:
>    * Move kernel mapping to vmalloc
>                                                                                   
> Changes in v2:
>    * Make RELOCATABLE depend on MMU as suggested by Anup
>    * Rename kernel_load_addr into kernel_virt_addr as suggested by Anup
>    * Use __pa_symbol instead of __pa, as suggested by Zong
>    * Rebased on top of v5.6-rc3
>    * Tested with sv48 patchset
>    * Add Reviewed/Tested-by from Zong and Anup
> 
> Alexandre Ghiti (4):
>    riscv: Move kernel mapping to vmalloc zone
>    riscv: Introduce CONFIG_RELOCATABLE
>    powerpc: Move script to check relocations at compile time in scripts/
>    riscv: Check relocations at compile time
> 
>   arch/powerpc/tools/relocs_check.sh |  18 +----
>   arch/riscv/Kconfig                 |  12 +++
>   arch/riscv/Makefile                |   5 +-
>   arch/riscv/Makefile.postlink       |  36 +++++++++
>   arch/riscv/boot/loader.lds.S       |   3 +-
>   arch/riscv/include/asm/page.h      |  10 ++-
>   arch/riscv/include/asm/pgtable.h   |  38 ++++++---
>   arch/riscv/kernel/head.S           |   3 +-
>   arch/riscv/kernel/module.c         |   4 +-
>   arch/riscv/kernel/vmlinux.lds.S    |   9 ++-
>   arch/riscv/mm/Makefile             |   4 +
>   arch/riscv/mm/init.c               | 121 +++++++++++++++++++++++++----
>   arch/riscv/mm/physaddr.c           |   2 +-
>   arch/riscv/tools/relocs_check.sh   |  26 +++++++
>   scripts/relocs_check.sh            |  20 +++++
>   15 files changed, 259 insertions(+), 52 deletions(-)
>   create mode 100644 arch/riscv/Makefile.postlink
>   create mode 100755 arch/riscv/tools/relocs_check.sh
>   create mode 100755 scripts/relocs_check.sh
> 

Do you have any remark regarding this series ?

Thanks,

Alex