Messages in this thread | | | From | Alexandre Ghiti <> | Subject | [PATCH v4 0/4] vmalloc kernel mapping and relocatable kernel | Date | Wed, 3 Jun 2020 04:00:06 -0400 |
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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 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
-- 2.20.1
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