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Subject[PATCHv2 00/10] Boot-time switching between 4- and 5-level paging
Date
[ This patchset is on top my previous 5-level paging patchset[1] ]

The basic idea is to implement the same logic as pgtable-nop4d.h provides,
but at runtime.

Runtime folding is only implemented for CONFIG_X86_5LEVEL=y case. With the
option disabled, we do compile-time folding as before..

Initially, I tried to fold pgd instread. I've got to shell, but it
required a lot of hacks as kernel threats pgd in a special way.

Comparing to RFC patchset, I've dealt with hacks and performance should be
fine now.

Please review and consider applying.

[1] http://lkml.kernel.org/r/20170716225954.74185-1-kirill.shutemov@linux.intel.com

Kirill A. Shutemov (10):
x86/kasan: Use the same shadow offset for 4- and 5-level paging
x86/xen: Provide pre-built page tables only for XEN_PV and XEN_PVH
x86/boot/compressed/64: Detect and handle 5-level paging at boot-time
x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL
x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable
x86/mm: Handle boot-time paging mode switching at early boot
x86/mm: Fold p4d page table layer at runtime
x86/mm: Replace compile-time checks for 5-level with runtime-time
x86/mm: Allow to boot without la57 if CONFIG_X86_5LEVEL=y
x86/mm: Offset boot-time paging mode switching cost

Documentation/x86/x86_64/5level-paging.txt | 9 +--
arch/x86/Kconfig | 5 +-
arch/x86/boot/compressed/head_64.S | 24 ++++++++
arch/x86/boot/compressed/kaslr.c | 14 +++++
arch/x86/boot/compressed/misc.h | 5 ++
arch/x86/entry/entry_64.S | 12 ++++
arch/x86/include/asm/kaslr.h | 4 --
arch/x86/include/asm/page_64.h | 4 ++
arch/x86/include/asm/page_64_types.h | 15 ++---
arch/x86/include/asm/paravirt.h | 8 +--
arch/x86/include/asm/pgalloc.h | 5 +-
arch/x86/include/asm/pgtable.h | 10 +++-
arch/x86/include/asm/pgtable_32.h | 2 +
arch/x86/include/asm/pgtable_32_types.h | 2 +
arch/x86/include/asm/pgtable_64_types.h | 53 ++++++++++++-----
arch/x86/include/asm/pgtable_types.h | 67 +++++----------------
arch/x86/include/asm/processor.h | 2 +-
arch/x86/include/asm/required-features.h | 8 +--
arch/x86/include/asm/sparsemem.h | 12 ++--
arch/x86/kernel/Makefile | 3 +-
arch/x86/kernel/head64.c | 71 +++++++++++++++++++---
arch/x86/kernel/head_64.S | 29 +++++----
arch/x86/mm/dump_pagetables.c | 20 ++++---
arch/x86/mm/fault.c | 2 +-
arch/x86/mm/ident_map.c | 2 +-
arch/x86/mm/init_64.c | 32 +++++-----
arch/x86/mm/kasan_init_64.c | 94 +++++++++++++++++++++++-------
arch/x86/mm/kaslr.c | 27 ++++-----
arch/x86/platform/efi/efi_64.c | 6 +-
arch/x86/power/hibernate_64.c | 6 +-
arch/x86/xen/mmu_pv.c | 2 +-
include/asm-generic/5level-fixup.h | 1 +
include/asm-generic/pgtable-nop4d.h | 1 +
include/linux/kasan.h | 2 +-
mm/kasan/kasan_init.c | 2 +-
35 files changed, 363 insertions(+), 198 deletions(-)

--
2.11.0

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