linux-kernel - [PATCH v7 0/9] x86: Confine early 1:1 mapped startup code

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Message-ID: <20240227151907.387873-11-ardb+git@google.com>
Date: Tue, 27 Feb 2024 16:19:08 +0100
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>, Kevin Loughlin <kevinloughlin@...gle.com>, 
	Tom Lendacky <thomas.lendacky@....com>, Dionna Glaze <dionnaglaze@...gle.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, 
	Brian Gerst <brgerst@...il.com>
Subject: [PATCH v7 0/9] x86: Confine early 1:1 mapped startup code

From: Ard Biesheuvel <ardb@...nel.org>

This is resend #2 of v5 [0] with some touchups applied. 

Changes since v6:
- Drop flawed patch to move some SME/SEV related calls out of the early
  boot path to avoid the potential need for backporting patches #6/#7
  to kernels where SEV support may not be crucial. This problem will be
  dealt with if/when it arises while doing those backports.

Changes since v5:
- drop patches that have been merged
- rebase onto latest tip/x86/boot
- fix comment regarding CR4.PGE wrt flushing of global TLB entries
- avoid adding startup code to .noinstr.text as it triggers objtool
  warnings

[0] https://lore.kernel.org/all/20240221113506.2565718-18-ardb+git@google.com/

Cc: Kevin Loughlin <kevinloughlin@...gle.com>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: Dionna Glaze <dionnaglaze@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>

Ard Biesheuvel (9):
  x86/startup_64: Simplify CR4 handling in startup code
  x86/startup_64: Defer assignment of 5-level paging global variables
  x86/startup_64: Simplify calculation of initial page table address
  x86/startup_64: Simplify virtual switch on primary boot
  efi/libstub: Add generic support for parsing mem_encrypt=
  x86/boot: Move mem_encrypt= parsing to the decompressor
  x86/sme: Move early SME kernel encryption handling into .head.text
  x86/sev: Move early startup code into .head.text section
  x86/startup_64: Drop global variables keeping track of LA57 state

 arch/x86/boot/compressed/misc.c                | 15 ++++
 arch/x86/boot/compressed/misc.h                |  4 -
 arch/x86/boot/compressed/pgtable_64.c          | 12 ---
 arch/x86/boot/compressed/sev.c                 |  3 +
 arch/x86/boot/compressed/vmlinux.lds.S         |  1 +
 arch/x86/include/asm/mem_encrypt.h             |  8 +-
 arch/x86/include/asm/pgtable_64_types.h        | 43 ++++-----
 arch/x86/include/asm/sev.h                     | 10 +--
 arch/x86/include/uapi/asm/bootparam.h          |  1 +
 arch/x86/kernel/cpu/common.c                   |  2 -
 arch/x86/kernel/head64.c                       | 61 ++-----------
 arch/x86/kernel/head_64.S                      | 93 ++++++++------------
 arch/x86/kernel/sev-shared.c                   | 23 +++--
 arch/x86/kernel/sev.c                          | 14 +--
 arch/x86/lib/Makefile                          | 13 ---
 arch/x86/mm/kasan_init_64.c                    |  3 -
 arch/x86/mm/mem_encrypt_identity.c             | 83 +++++------------
 drivers/firmware/efi/libstub/efi-stub-helper.c |  8 ++
 drivers/firmware/efi/libstub/efistub.h         |  2 +-
 drivers/firmware/efi/libstub/x86-stub.c        |  3 +
 20 files changed, 147 insertions(+), 255 deletions(-)

-- 
2.44.0.rc1.240.g4c46232300-goog