Messages in this thread | | | From | Alexandre Ghiti <> | Subject | [PATCH v4 0/4] riscv: Map the kernel with correct permissions the first time | Date | Fri, 4 Jun 2021 13:49:46 +0200 |
| |
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(-)
-- 2.30.2
| |