Messages in this thread | | | From | "Kirill A. Shutemov" <> | Subject | [PATCHv9 0/4] x86: 5-level related changes into decompression code | Date | Fri, 9 Feb 2018 17:22:24 +0300 |
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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.
v9: - 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. v8: - Support switching from 5- to 4-level paging. v7: - 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 4G
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
-- 2.15.1
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