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Subject[PATCHv9 0/4] x86: 5-level related changes into decompression code
These patcheset is a preparation for boot-time switching between paging
modes. Please apply.

The first patch is pure cosmetic change: it gives file with KASLR helpers
a proper name.

The last three patches bring support of booting into 5-level paging mode if
a bootloader put the kernel above 4G.

Patch 2/4 Renames l5_paging_required() into paging_prepare() and change
interface of the function.
Patch 3/4 Handles allocation of space for trampoline and gets it prepared.
Patch 4/4 Gets trampoline used.

- Patch 3 now saves and restores lowmem used for trampoline.

There was report the patch causes issue on a machine. I suspect it's
BIOS issue that doesn't report proper bounds of usable lowmem.

Restoring memory back to oringinal state makes problem go away.
- Support switching from 5- to 4-level paging.
- Fix booting when 5-level paging is enabled before handing off boot to
the kernel, like in kexec() case.

Kirill A. Shutemov (4):
x86/boot/compressed/64: Rename pagetable.c to kaslr_64.c
x86/boot/compressed/64: Introduce paging_prepare()
x86/boot/compressed/64: Prepare trampoline memory
x86/boot/compressed/64: Handle 5-level paging boot if kernel is above

arch/x86/boot/compressed/Makefile | 2 +-
arch/x86/boot/compressed/head_64.S | 178 ++++++++++++++-------
.../boot/compressed/{pagetable.c => kaslr_64.c} | 0
arch/x86/boot/compressed/pgtable.h | 18 +++
arch/x86/boot/compressed/pgtable_64.c | 100 ++++++++++--
5 files changed, 232 insertions(+), 66 deletions(-)
rename arch/x86/boot/compressed/{pagetable.c => kaslr_64.c} (100%)
create mode 100644 arch/x86/boot/compressed/pgtable.h


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