Version 4 changes:
1. Rename INIT_DIR to INIT_PG_TABLES and move it outside the
'.init.data' section[1].
2. Move the 'count' calculation to clear_pages()[1].
3. Rearrange register in __enable_mmu() and pass ttbr1 through
the x1 register[2].
4. Add commit message to explain why we can make swapper_pg_dir
smaller[3].
5. Rewrite in_swapper_pgdir() and use pgd_set_fixmap() to
populate swapper_pg_dir. At the same time, add a spin lock to
avoid race conditions[4].
6. Move {idmap_pg_dir,tramp_pg_dir,reserved_ttbr0,swapper_pg_dir}
to the KERNEL_PG_TABLES macro. And put this macro after
NOTES[4].
7. Update init_mm.pgd before kasan_early_init() and
kaslr_early_init(), which makes pgd_offset_k() work properly.
Test following configs with CONFIG_RANDOMIZE_BASE/UNMAP_KERNEL_AT_EL0/
CONFIG_ARM64_SW_TTBR0_PAN enabled on qemu:
1. CONFIG_ARM64_4K_PAGES/CONFIG_ARM64_VA_BITS_48
2. CONFIG_ARM64_4K_PAGES/CONFIG_ARM64_VA_BITS_39
3. CONFIG_ARM64_64K_PAGES/CONFIG_ARM64_VA_BITS_48
4. CONFIG_ARM64_64K_PAGES/CONFIG_ARM64_VA_BITS_42
v3: https://www.spinics.net/lists/arm-kernel/msg662537.html
v2: https://patchwork.kernel.org/patch/10485641/
v1: https://patchwork.kernel.org/patch/10476595/
[1] https://lkml.org/lkml/2018/7/6/238
[2] https://lkml.org/lkml/2018/7/6/239
[3] https://lkml.org/lkml/2018/7/6/243
[4] https://lkml.org/lkml/2018/7/11/782
Jun Yao (6):
arm64/mm: Introduce init_pg_dir
arm64/mm: Make __enable_mmu() take the ttbr1 page as an argument
arm64/mm: Create initial page tables in init_pg_dir
arm64/mm: Make swapper_pg_dir smaller
arm64/mm: Populate swapper_pg_dir by fixmap
arm64/mm: Move {idmap_pg_dir, swapper_pg_dir} to .rodata section
arch/arm64/include/asm/assembler.h | 29 +++++++++++++
arch/arm64/include/asm/pgtable.h | 66 ++++++++++++++++++++++++++----
arch/arm64/kernel/head.S | 48 ++++++++++++++--------
arch/arm64/kernel/sleep.S | 1 +
arch/arm64/kernel/vmlinux.lds.S | 47 ++++++++++++++-------
arch/arm64/mm/mmu.c | 35 ++++------------
6 files changed, 159 insertions(+), 67 deletions(-)
--
2.17.1
