Messages in this thread | | | From | Alexandre Ghiti <> | Subject | [PATCH v8 0/2] Map the kernel with correct permissions the first time | Date | Thu, 24 Jun 2021 14:00:39 +0200 |
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The kernel permissions are fixed after the kernel page table is created: avoid that by mapping the kernel 'correctly' the first time.
Patch 1 introduces a new helper to set kernel mapping permissions while avoiding all the casts when using set_memory_* API.
Patch 2 is the bulk of this work and deals with mapping the kernel with the right permissions.
Changes in v8: * Move set_kernel_memory inline function into set_memory.h header as suggested by Jisheng * Make set_kernel_memory arguments name consistent
Changes in v7: * Split long lines and reintroduce parameters names of set_kernel_memory callback, as suggested by Christoph * Make set_kernel_memory __always_inline as suggested by Christoph * Change 64b spelling into 64-bit, as suggested by Christoph
Changes in v6: * load_sz was placed in init section but is now used in kernel address conversions macros, so remove this attribute.
Changes in v5: * Remove non-relevant commits to this patchset that raised issues * Make load_sz non-static as it is used in kernel address conversions macros * Rebased on top for-next
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 (2): riscv: Introduce set_kernel_memory helper riscv: Map the kernel with correct permissions the first time
arch/riscv/include/asm/page.h | 13 +++- arch/riscv/include/asm/sections.h | 17 +++++ arch/riscv/include/asm/set_memory.h | 24 ++++-- arch/riscv/kernel/setup.c | 12 +-- arch/riscv/mm/init.c | 112 ++++++++++++---------------- 5 files changed, 97 insertions(+), 81 deletions(-)
-- 2.30.2
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