linux-kernel - [PATCHv6, RESEND 0/4] x86: 5-level related changes into decompression code

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Message-Id: <20180123170913.41791-1-kirill.shutemov@linux.intel.com>
Date:   Tue, 23 Jan 2018 20:09:09 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Borislav Petkov <bp@...e.de>, Andi Kleen <ak@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv6, RESEND 0/4] x86: 5-level related changes into decompression code

These patcheset is a preparation set 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.

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                 | 134 ++++++++++++---------
 .../boot/compressed/{pagetable.c => kaslr_64.c}    |   0
 arch/x86/boot/compressed/pgtable.h                 |  18 +++
 arch/x86/boot/compressed/pgtable_64.c              |  65 ++++++++--
 5 files changed, 153 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