linux-kernel - [RESEND PATCH v4 0/6] arm64/mm: Move

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Date:   Wed, 18 Jul 2018 18:17:21 +0800
From:   Jun Yao <yaojun8558363@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will.deacon@....com, james.morse@....com,
        linux-kernel@...r.kernel.org
Subject: [RESEND PATCH v4 0/6] arm64/mm: Move

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