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SubjectRe: [PATCH v4 0/4] riscv: Map the kernel with correct permissions the first time
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On Fri, 04 Jun 2021 04:49:46 PDT (-0700), alex@ghiti.fr wrote:
> The kernel permissions are fixed after the kernel page table is created:
> avoid that by mapping the kernel 'correctly' the first time.
>
> Patch 2 is a cleanup patch on which the next patches are based on, not
> necessary for this patchset though and relies on patch 1.
>
> Patch 3 introduces a new helper to set kernel mapping permissions while
> avoiding all the casts when using set_memory_* API.
>
> Patch 4 is the bulk of this work and deals with mapping the kernel with
> the right permissions.
>
> Changes in v4:
> * Add patch 1 as noted by Jisheng
> * Changes patch 2 title as suggested by Anup
> * Add Reviewed-by from Anup
>
> Changes in v3:
> * Add a patch that factorizes kernel address conversions
> * Add a helper called set_kernel_memory in its own patch, as suggested by
> Christoph
> * Prefer IS_ENABLED over #ifdef, as suggested by Christoph
> * Split overly long lines, as suggested by Christoph
> * Simplify kernel mapping by mapping ALL text as readonly and taking advantage
> of already present code that enables write for init text before
> free_initmem_default.
>
> Changes in v2:
> * Rebased on top of for-next (and "riscv: mm: fix build errors caused by
> mk_pmd()")
> * Get rid of protect_kernel_linear_mapping_text_rodata as suggested by
> Jisheng
> * Improve code in general compared to previous RFC
>
> Alexandre Ghiti (4):
> riscv: Remove CONFIG_PHYS_RAM_BASE_FIXED
> riscv: Simplify xip and !xip kernel address conversion macros
> riscv: Introduce set_kernel_memory helper
> riscv: Map the kernel with correct permissions the first time
>
> arch/riscv/Kconfig | 6 --
> arch/riscv/include/asm/page.h | 27 ++++----
> arch/riscv/include/asm/pgtable.h | 2 +
> arch/riscv/include/asm/sections.h | 17 +++++
> arch/riscv/include/asm/set_memory.h | 13 ++--
> arch/riscv/kernel/setup.c | 11 +--
> arch/riscv/mm/init.c | 102 ++++++++++++----------------
> arch/riscv/mm/pageattr.c | 10 +++
> 8 files changed, 95 insertions(+), 93 deletions(-)

Thanks, these are on for-next. I had a few conflicts, let me know if
something went wrong.

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