[PATCH 0/1] Insert LibSPDM in QEMU enabling in-tree compilation

[htafr <htafreit@gmail.com>]

(I) Summary
===========================================================================

This patch is the beginning of the support of the Security Protocol and 
Data Model (SPDM). There are some known issues (see II), but it's
usable and not many users are going to use this functionality for now,
but for those who will it may facilitate the development.

There are some people working with LibSPDM to implement the SPDM on 
emulated devices, however current works that use QEMU compile LibSPDM
out-of-tree [1][2][3]. This patch enables the compilation of LibSPDM when 
user pass the parameter '--enable-libspdm' to configure file, this option 
is disabled by default. The following parameters were also added:

  --libspdm-crypto=CHOICE  set LibSPDM crypto algorithm [mbedtls] (choices:
                           mbedtls/openssl)
  --libspdm-toolchain=VALUE
                           toolchain to use for LibSPDM compilation [GCC]

In order to facilitate future code development using LibSPDM API, this
patch also provides the definition of the macro 'CONFIG_LIBSPDM'.


(II) Known Limitations
===========================================================================

1. This patch enables LibSPDM in-tree compilation for Linux systems only.
2. LibSPDM compilation uses CMake, so meson build system is making use
   of the CMake module [4].
3. Some problems may occur when compiling LibSPDM with MbedTls such as:
    error: "_GNU_SOURCE" redefined [-Werror]
      10 | #define _GNU_SOURCE

   It's possible to compile using --disable-werror.

(III) Sample configuration
===========================================================================

../configure \
  --disable-werror \
  --enable-libspdm \
  --libspdm-crypto=mbedtls \
  --enable-gcov

References:
[1] riscv-spdm 
  Link: https://github.com/htafr/riscv-spdm
[2] spdm-benchmark 
  Link: https://github.com/rcaalves/spdm-benchmark
[3] qemu-spdm-emulation-guide
  Link: https://github.com/twilfredo/qemu-spdm-emulation-guide
[4] The Meson Build System: CMake module
  Link: https://mesonbuild.com/CMake-module.html

htafr (1):
  libspdm: insert LibSPDM as subproject

 .gitmodules                   |  3 ++
 Kconfig.host                  |  3 ++
 meson.build                   | 84 +++++++++++++++++++++++++++++++++++
 meson_options.txt             |  8 ++++
 scripts/make-config-poison.sh | 19 ++++----
 scripts/meson-buildoptions.sh |  9 ++++
 6 files changed, 117 insertions(+), 9 deletions(-)

-- 
2.43.0