riscv: Add support to dump the kernel page tables

In a similar manner to arm64, x86, powerpc, etc., it can traverse all page tables, and dump the page table layout with the memory types and permissions. Add a debugfs file at /sys/kernel/debug/kernel_page_tables to export the page table layout to userspace. Signed-off-by: Zong Li <zong.li@sifive.com> Tested-by: Alexandre Ghiti <alex@ghiti.fr> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
2026-09-26 18:16:26 +00:00 · 2020-03-12 10:58:35 +08:00 · 2020-03-12 10:58:35 +08:00 · 59c4da8640
commit 59c4da8640
parent 8fdddb2eae
5 changed files with 340 additions and 0 deletions
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
--- a/arch/riscv/include/asm/ptdump.h
+++ b/arch/riscv/include/asm/ptdump.h
--- a/arch/riscv/mm/Makefile
+++ b/arch/riscv/mm/Makefile
--- a/arch/riscv/mm/ptdump.c
+++ b/arch/riscv/mm/ptdump.c