[PATCH v2 00/16] x86: head_64.S spring cleaning

[Ard Biesheuvel]

After doing some cleanup work on the EFI code in head_64.S, the mixed
mode code in particular, I noticed that the memory encryption pieces
could use some attention as well, so I cleaned that up too.

I have been sitting on these patches since November, waiting for the
right time to post them, i.e., after the SEV/SNP review had finished.
This has yet to happen, so I'm posting them now instead. Please feel
free to disregard for the time being, and propose a suitable timeframe
to repost them if this is likely to conflict with ongoing work.

Changes since v1:
- at Boris's request, split the patches into smaller ones that are
  easier to review

Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Michael Roth <michael.roth@xxxxxxx>

Ard Biesheuvel (16):
  x86/compressed: efi-mixed: rename efi_thunk_64.S to efi-mixed.S
  x86/compressed: efi-mixed: move 32-bit entrypoint code into .text
    section
  x86/compressed: efi-mixed: move bootargs parsing out of 32-bit startup
    code
  x86/compressed: efi-mixed: move efi32_pe_entry into .text section
  x86/compressed: efi-mixed: move efi32_entry out of head_64.S
  x86/compressed: efi-mixed: move efi32_pe_entry() out of head_64.S
  x86/compressed: efi: merge multiple definitions of image_offset into
    one
  x86/compressed: efi-mixed: simplify IDT/GDT preserve/restore
  x86/compressed: avoid touching ECX in startup32_set_idt_entry()
  x86/compressed: pull global variable ref up into startup32_load_idt()
  x86/compressed: move startup32_load_idt() into .text section
  x86/compressed: move startup32_load_idt() out of head_64.S
  x86/compressed: move startup32_check_sev_cbit() into .text
  x86/compressed: move startup32_check_sev_cbit() out of head_64.S
  x86/compressed: adhere to calling convention in
    get_sev_encryption_bit()
  x86/compressed: only build mem_encrypt.S if AMD_MEM_ENCRYPT=y

 arch/x86/boot/compressed/Makefile       |   8 +-
 arch/x86/boot/compressed/efi_mixed.S    | 337 ++++++++++++++++++++
 arch/x86/boot/compressed/efi_thunk_64.S | 195 -----------
 arch/x86/boot/compressed/head_32.S      |   4 -
 arch/x86/boot/compressed/head_64.S      | 299 +----------------
 arch/x86/boot/compressed/mem_encrypt.S  | 152 ++++++++-
 drivers/firmware/efi/libstub/x86-stub.c |   2 +-
 7 files changed, 496 insertions(+), 501 deletions(-)
 create mode 100644 arch/x86/boot/compressed/efi_mixed.S
 delete mode 100644 arch/x86/boot/compressed/efi_thunk_64.S

-- 
2.35.1