From: Ard Biesheuvel <ardb@kernel.org>
!! NOTE: patches #7 - #10 depend on [0] !!
Reorganize C code that is used during early boot, either in the
decompressor/EFI stub or the kernel proper, but before the kernel
virtual mapping is up.
v4:
- drop patches that were queued up
- fix address space error in patch #1
- add patches for SEV-SNP boot code - these cannot be applied yet, but
are included for completeness
v3:
- keep rip_rel_ptr() around in PIC code - sadly, it is still needed in
some cases
- remove RIP_REL_REF() uses in separate patches
- keep __head annotations for now, they will all be removed later
- disable objtool validation for library objects (i.e., pieces that are
not linked into vmlinux)
I will follow up with a series that gets rid of .head.text altogether,
as it will no longer be needed at all once the startup code is checked
for absolute relocations.
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Dionna Amalie Glaze <dionnaglaze@google.com>
Cc: Kevin Loughlin <kevinloughlin@google.com>
[0] https://lore.kernel.org/all/20250410132850.3708703-2-ardb+git@google.com/T/#u
Ard Biesheuvel (11):
x86/asm: Make rip_rel_ptr() usable from fPIC code
x86/boot: Move the early GDT/IDT setup code into startup/
x86/boot: Move early kernel mapping code into startup/
x86/boot: Drop RIP_REL_REF() uses from early mapping code
x86/boot: Move early SME init code into startup/
x86/boot: Drop RIP_REL_REF() uses from SME startup code
x86/sev: Prepare for splitting off early SEV code
x86/sev: Split off startup code from core code
x86/boot: Move SEV startup code into startup/
x86/boot: Drop RIP_REL_REF() uses from early SEV code
x86/asm: Retire RIP_REL_REF()
arch/x86/boot/compressed/Makefile | 2 +-
arch/x86/boot/compressed/sev.c | 17 +-
arch/x86/boot/startup/Makefile | 16 +
arch/x86/boot/startup/gdt_idt.c | 84 +
arch/x86/boot/startup/map_kernel.c | 225 +++
arch/x86/{coco/sev/shared.c => boot/startup/sev-shared.c} | 375 +----
arch/x86/boot/startup/sev-startup.c | 1395 ++++++++++++++++
arch/x86/{mm/mem_encrypt_identity.c => boot/startup/sme.c} | 19 +-
arch/x86/coco/sev/Makefile | 19 -
arch/x86/coco/sev/core.c | 1726 ++++----------------
arch/x86/include/asm/asm.h | 5 -
arch/x86/include/asm/coco.h | 2 +-
arch/x86/include/asm/mem_encrypt.h | 2 +-
arch/x86/include/asm/sev-internal.h | 112 ++
arch/x86/include/asm/sev.h | 37 +
arch/x86/kernel/head64.c | 285 +---
arch/x86/mm/Makefile | 6 -
17 files changed, 2208 insertions(+), 2119 deletions(-)
create mode 100644 arch/x86/boot/startup/gdt_idt.c
create mode 100644 arch/x86/boot/startup/map_kernel.c
rename arch/x86/{coco/sev/shared.c => boot/startup/sev-shared.c} (78%)
create mode 100644 arch/x86/boot/startup/sev-startup.c
rename arch/x86/{mm/mem_encrypt_identity.c => boot/startup/sme.c} (97%)
create mode 100644 arch/x86/include/asm/sev-internal.h
--
2.49.0.504.g3bcea36a83-goog