[PATCH v3 00/22] x86: Trenchboot Secure Launch DRTM (Xen)

[Sergii Dmytruk <sergii.dmytruk@xxxxxxxxx>]

The aim of the [TrenchBoot] project is to provide an implementation of
DRTM that is generic enough to cover various use cases:
 - Intel TXT and AMD SKINIT on x86 CPUs
 - legacy and UEFI boot
 - TPM1.2 and TPM2.0
 - (in the future) DRTM on Arm CPUs

DRTM is a version of a measured launch that starts on request rather
than at the start of a boot cycle.  One of its advantages is in not
including the firmware in the chain of trust.

Xen already supports DRTM via [tboot] which targets Intel TXT only.
tboot employs encapsulates some of the DRTM details within itself while
with TrenchBoot Xen (or Linux) is meant to be a self-contained payload
for a TrenchBoot-enabled bootloader (think GRUB).  The one exception is
that UEFI case requires calling back into bootloader to initiate DRTM,
which is necessary to give Xen a chance of querying all the information
it needs from the firmware before performing DRTM start.

>From reading the above tboot might seem like a more abstracted, but the
reality is that the payload needs to have DRTM-specific knowledge either
way.  TrenchBoot in principle allows coming up with independent
implementations of bootloaders and payloads that are compatible with
each other.

The "x86/boot: choose AP stack based on APIC ID" patch is shared with
[Parallelize AP bring-up] series which is required here because Intel
TXT always releases all APs simultaneously.  The rest of the patches are
unique.

This version of the patches corresponds to this branch:
    
https://github.com/TrenchBoot/xen/compare/d7d55c27cc...aem-staging-2025-05-30-v3

-----

[TrenchBoot]: https://trenchboot.org/
[tboot]: https://sourceforge.net/p/tboot/wiki/Home/
[Parallelize AP bring-up]: 
https://lore.kernel.org/xen-devel/cover.1699982111.git.krystian.hebel@xxxxxxxxx/
[v1]: 
https://lore.kernel.org/xen-devel/cover.1745172094.git.sergii.dmytruk@xxxxxxxxx/
[v2]: 
https://lore.kernel.org/xen-devel/cover.1747155790.git.sergii.dmytruk@xxxxxxxxx/

-----

Changes in v3:
 - sorted `F:` entries in MAINTAINERS file
 - made sha1 implementation more similar to sha256
 - dropped unused parameter from xen/arch/x86/cpu/intel.c:intel_log_smx_txt()
 - updated header guards according to new style
 - xen/arch/x86/include/asm/intel-txt.h:
   + briefly explained what TXT is
   + renamed: NR_TXT_CONFIG_SIZE -> TXT_CONFIG_SPACE_SIZE
   + renamed: read_txt_reg() -> txt_read()
   + renamed: write_txt_reg() -> txt_write()
   + marked txt_reset() as noreturn and used unreacheable() instead of while(1)
   + explained a bit more about TXT Heap
 - xen/include/xen/slr-table.h:
   + briefly explained what SLRT is
   + fixed checks in slr_next_entry()
 - SPDX-License-Identifier: GPL-2.0 -> GPL-2.0-only
 - made more code const-correct
 - use arithmetic on pointers to `void` instead of pointers to `uint8_t`

Changes in [v2]:
 - using dashes instead of underscores in the names of new files
 - dropping of an extra sha256 implementation
 - rewriting sha1 implementation to be in line with already present
   sha256 implementation (simplifying it and getting rid of macros)
 - correct placement of new lines in Makefile
 - add header guards to all new files
 - use correct names for header guards in new files
 - update license of xen/include/xen/slr-table.h
 - changed fixmlehdr to search for header within 8 instead of 4 KiB file
   prefix
 - don't print DRTM-related capabilities when resuming from S3
 - forbade S3 in case of Secure Launch
 - fixed an issue with resuming from S3 caused by inappropriate use of
   __initdata
 - added a new section to MAINTAINERS
 - improved commit messages
 - fixed MISRA C violations:
   * shadowing of e820 global
   * missing U literal suffixes
   * use of ull literal suffix
   * excluded fixmlehdr from analysis (similar to other build tools)
   * use of 0 instead of NULL in one place
   * provided declarations for some definitions
   * marked asm-invoked functions with `asmlinkage`

-----

Kacper Stojek (2):
  x86/boot: add MLE header and Secure Launch entry point
  xen/arch/x86: reserve TXT memory during Slaunch

Krystian Hebel (7):
  x86/include/asm/intel-txt.h: constants and accessors for TXT registers
    and heap
  x86/boot/slaunch-early: early TXT checks and boot data retrieval
  x86/slaunch: restore boot MTRRs after Intel TXT DRTM
  xen/lib: add implementation of SHA-1
  x86/tpm.c: code for early hashing and extending PCRs (for TPM1.2)
  x86/boot: choose AP stack based on APIC ID
  x86/smpboot.c: TXT AP bringup

Michał Żygowski (2):
  x86/hvm: check for VMX in SMX if Slaunch is active
  x86/cpu: report SMX, TXT and SKINIT capabilities

Sergii Dmytruk (11):
  include/xen/slr-table.h: Secure Launch Resource Table definitions
  x86/boot/slaunch-early: implement early initialization
  x86/mtrr: expose functions for pausing caching
  x86/tpm.c: support extending PCRs of TPM2.0
  x86/tpm.c: implement event log for TPM2.0
  x86/slaunch: process DRTM policy
  x86/acpi: disallow S3 on Secure Launch boot
  x86/boot/slaunch-early: find MBI and SLRT on AMD
  x86/slaunch: support AMD SKINIT
  x86/slaunch: support EFI boot
  MAINTAINERS: add a section for TrenchBoot Slaunch

 .gitignore                                    |    1 +
 MAINTAINERS                                   |   15 +
 .../eclair_analysis/ECLAIR/out_of_scope.ecl   |    1 +
 docs/hypervisor-guide/x86/how-xen-boots.rst   |    7 +
 xen/arch/x86/Makefile                         |   12 +-
 xen/arch/x86/acpi/power.c                     |    8 +
 xen/arch/x86/boot/Makefile                    |   10 +-
 xen/arch/x86/boot/head.S                      |  250 ++++
 xen/arch/x86/boot/slaunch-early.c             |  105 ++
 xen/arch/x86/boot/trampoline.S                |   40 +-
 xen/arch/x86/boot/x86_64.S                    |   42 +-
 xen/arch/x86/cpu/amd.c                        |   16 +
 xen/arch/x86/cpu/cpu.h                        |    1 +
 xen/arch/x86/cpu/hygon.c                      |    1 +
 xen/arch/x86/cpu/intel.c                      |   46 +
 xen/arch/x86/cpu/mtrr/generic.c               |   51 +-
 xen/arch/x86/e820.c                           |    5 +
 xen/arch/x86/efi/efi-boot.h                   |   88 +-
 xen/arch/x86/efi/fixmlehdr.c                  |  127 ++
 xen/arch/x86/hvm/vmx/vmcs.c                   |    3 +-
 xen/arch/x86/include/asm/apicdef.h            |    4 +
 xen/arch/x86/include/asm/intel-txt.h          |  478 ++++++++
 xen/arch/x86/include/asm/mm.h                 |    3 +
 xen/arch/x86/include/asm/msr-index.h          |    3 +
 xen/arch/x86/include/asm/mtrr.h               |    8 +
 xen/arch/x86/include/asm/processor.h          |    1 +
 xen/arch/x86/include/asm/slaunch.h            |   98 ++
 xen/arch/x86/include/asm/tpm.h                |   19 +
 xen/arch/x86/intel-txt.c                      |  188 +++
 xen/arch/x86/setup.c                          |   32 +-
 xen/arch/x86/slaunch.c                        |  465 ++++++++
 xen/arch/x86/smpboot.c                        |   63 +
 xen/arch/x86/tboot.c                          |   20 +-
 xen/arch/x86/tpm.c                            | 1056 +++++++++++++++++
 xen/common/efi/boot.c                         |    4 +
 xen/common/efi/runtime.c                      |    1 +
 xen/include/xen/efi.h                         |    1 +
 xen/include/xen/sha1.h                        |   14 +
 xen/include/xen/slr-table.h                   |  276 +++++
 xen/lib/Makefile                              |    1 +
 xen/lib/sha1.c                                |  190 +++
 41 files changed, 3698 insertions(+), 56 deletions(-)
 create mode 100644 xen/arch/x86/boot/slaunch-early.c
 create mode 100644 xen/arch/x86/efi/fixmlehdr.c
 create mode 100644 xen/arch/x86/include/asm/intel-txt.h
 create mode 100644 xen/arch/x86/include/asm/slaunch.h
 create mode 100644 xen/arch/x86/include/asm/tpm.h
 create mode 100644 xen/arch/x86/intel-txt.c
 create mode 100644 xen/arch/x86/slaunch.c
 create mode 100644 xen/arch/x86/tpm.c
 create mode 100644 xen/include/xen/sha1.h
 create mode 100644 xen/include/xen/slr-table.h
 create mode 100644 xen/lib/sha1.c


base-commit: d7d55c27cc3253fb3634a0e468ef5df30487552b
-- 
2.49.0