REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

Intel's Trust Domain Extensions (Intel TDX) refers to an Intel technology
that extends Virtual Machines Extensions (VMX) and Multi-Key Total Memory
Encryption (MKTME) with a new kind of virutal machines guest called a 
Trust Domain (TD). A TD is desinged to run in a CPU mode that protects the
confidentiality of TD memory contents and the TD's CPU state from other
software, including the hosting Virtual-Machine Monitor (VMM), unless
explicitly shared by the TD itself.

The patch-sets to support Intel TDX in OvmfPkg is split into several
waves. This is wave1 which adds Intel TDX support in OvmfPkg/ResetVector.
Note: TDX only works in X64.

Patch 1 add the PCDs of BFV/CFV. BFV is the code part of the image. CFV is
the configuration part. BFV is measured by VMM and CFV is measured by TDVF
itself.

Patch 2 add TdxMetadata in OvmfPkg/ResetVector. It describes the
information about the image so that VMM can do the initialization and
measurement based on these information.

Patch 3 updates the UefiCpuPkg/Vtf0/Main.asm to add Main32 entrypoint. It
is because on reset all the CPUs are in 32-bit protected mode. In the
Main32 entry point, Init32 is called to do the 32-bit initializaiton. In
UefiCpuPkg/ResetVector/Vtf0/Ia32, Init32.asm is added. It is a null stub
of the 32-bit initialization. The actual work is implemented in OvmfPkg.

In Patch 4, InitTdx.asm does the tdx initialization, ReloadFlat32 loads
the GDT and sets the CR0, then jump to 32-bit protected mode. Init32.asm
put above 2 together to complete the 32-bit initializaiton. After that
page tables are built and set, then jump to SecEntry.

[TDX]: https://software.intel.com/content/dam/develop/external/us/en/
documents/tdx-whitepaper-final9-17.pdf

[TDVF]: https://software.intel.com/content/dam/develop/external/us/en/
documents/tdx-virtual-firmware-design-guide-rev-1.pdf

Code is at https://github.com/mxu9/edk2/tree/tdvf_wave1.v2

v2 changes:
 - Move InitTdx.asm and ReloadFlat32.asm from UefiCpuPkg/ResetVector/Vtf0
   to OvmfPkg/ResetVector. Init32.asm is created which is a null stub of
   32-bit initialization. In Main32 just simply call Init32. It makes
   the Main.asm in UefiCpuPkg/ResetVector clean and clear.
 - Init32.asm/InitTdx.asm/ReloadFlat32.asm are created under
   OvmfPkg/ResetVector/Ia32.
 - Update some descriptions of the patch-sets.
 - Update the REF link in cover letter.
 - Add Ard Biesheuvel in Cc list.

v1: https://edk2.groups.io/g/devel/message/77675

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
CC: Debkumar De <debkumar.de@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>

Min Xu (4):
  OvmfPkg: Add Tdx BFV/CFV PCDs and PcdOvmfImageSizeInKb
  OvmfPkg: Add Tdx metadata
  UefiCpuPkg/ResetVector: Add Main32 entry point in Main.asm
  OvmfPkg/ResetVector: Update ResetVector to support Tdx

 OvmfPkg/OvmfPkg.dec                          | 13 +++
 OvmfPkg/OvmfPkgDefines.fdf.inc               | 12 ++-
 OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm | 38 ++++++++
 OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm  | 47 ++++++++++
 OvmfPkg/ResetVector/Ia32/Init32.asm          | 34 +++++++
 OvmfPkg/ResetVector/Ia32/InitTdx.asm         | 57 ++++++++++++
 OvmfPkg/ResetVector/Ia32/PageTables64.asm    | 41 +++++++++
 OvmfPkg/ResetVector/Ia32/ReloadFlat32.asm    | 44 +++++++++
 OvmfPkg/ResetVector/ResetVector.inf          | 11 ++-
 OvmfPkg/ResetVector/ResetVector.nasmb        | 65 ++++++++++++-
 OvmfPkg/ResetVector/X64/TdxMetadata.asm      | 97 ++++++++++++++++++++
 UefiCpuPkg/ResetVector/Vtf0/Ia32/Init32.asm  | 13 +++
 UefiCpuPkg/ResetVector/Vtf0/Main.asm         | 14 +++
 UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb       |  2 +-
 14 files changed, 483 insertions(+), 5 deletions(-)
 create mode 100644 OvmfPkg/ResetVector/Ia32/Init32.asm
 create mode 100644 OvmfPkg/ResetVector/Ia32/InitTdx.asm
 create mode 100644 OvmfPkg/ResetVector/Ia32/ReloadFlat32.asm
 create mode 100644 OvmfPkg/ResetVector/X64/TdxMetadata.asm
 create mode 100644 UefiCpuPkg/ResetVector/Vtf0/Ia32/Init32.asm

-- 
2.29.2.windows.2



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