[PATCHv3 0/5] x86: 5-level related changes into decompression code

[Kirill A. Shutemov]

Hi Ingo,

Here's updated changes that prepare the code to boot-time switching between
paging modes and handle booting in 5-level mode when bootloader put kernel
image above 4G, but haven't enabled 5-level paging for us.

First two patches can be backported to v4.14 to provide sensible error
message when CONFIG_X86_5LEVEL=y kernel is booted on hardware that doesn't
support the feature.

Please review and consider applying.

Kirill A. Shutemov (5):
  x86/boot/compressed/64: Detect and handle 5-level paging at boot-time
  x86/boot/compressed/64: Print error if 5-level paging is not supported
  x86/boot/compressed/64: Rename pagetable.c to kaslr_64.c
  x86/boot/compressed/64: Introduce place_trampoline()
  x86/boot/compressed/64: Handle 5-level paging boot if kernel is above
    4G

 arch/x86/boot/compressed/Makefile                  |   3 +-
 arch/x86/boot/compressed/head_64.S                 | 108 +++++++++++++--------
 .../boot/compressed/{pagetable.c => kaslr_64.c}    |   0
 arch/x86/boot/compressed/misc.c                    |  16 +++
 arch/x86/boot/compressed/pgtable.h                 |  18 ++++
 arch/x86/boot/compressed/pgtable_64.c              |  61 ++++++++++++
 6 files changed, 166 insertions(+), 40 deletions(-)
 rename arch/x86/boot/compressed/{pagetable.c => kaslr_64.c} (100%)
 create mode 100644 arch/x86/boot/compressed/pgtable.h
 create mode 100644 arch/x86/boot/compressed/pgtable_64.c

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2.15.0