TDX host kernel support

Hi all,

(Again I didn't include the full cover letter here to save people's time.
The full coverletter can be found in the v13 [1]).

This version mainly addressed one issue that we (Intel people) discussed
internally: to only initialize TDX module 1.5 and later versions. The reason is TDX 1.0 has some incompatibility issues to the TDX 1.5 and later version (for detailed information please see [2]). There's no value to support TDX 1.0 when the TDX 1.5 are already out.

Hi Kirill, Dave (and all),

Could you help to review the new patch mentioned in the detailed changes below (and other minor changes due to rebase to it)?

Appreciate a lot!

The detailed changes:

(please refer to individual patch for specific changes to them.)

- v14 -> v15:
- Rebased to latest (today) master branch of Linus's tree.
- Removed the patch which uses TDH.SYS.INFO to get TDSYSINFO_STRUCT.
- Added a new patch to use TDH.SYS.RD (which is the new SEAMCALL to read TDX module metadata in TDX 1.5) to read essential metadata for module initialization and stop initializing TDX 1.0.
- Put the new patch after the patch to build the TDX-usable memory list becaues CMRs are not readed from TDX module anymore.
- Very minor rebase changes in other couple of patches due to the new TDH.SYS.RD patch.
- Addressed all comments (few) received in v14 (Rafael/Nikolay).
- Added people's tags -- thanks! (Sathy, Nickolay).

v14: https://lore.kernel.org/lkml/[email protected]/T/

[1] v13: https://lore.kernel.org/lkml/[email protected]/T/
[2] "TDX module ABI incompatibilities" spec:

    https://cdrdv2.intel.com/v1/dl/getContent/773041

Kai Huang (23):
x86/virt/tdx: Detect TDX during kernel boot
x86/tdx: Define TDX supported page sizes as macros x86/virt/tdx: Make INTEL_TDX_HOST depend on X86_X2APIC x86/cpu: Detect TDX partial write machine check erratum x86/virt/tdx: Handle SEAMCALL no entropy error in common code x86/virt/tdx: Add SEAMCALL error printing for module initialization x86/virt/tdx: Add skeleton to enable TDX on demand x86/virt/tdx: Use all system memory when initializing TDX module as
TDX memory
x86/virt/tdx: Get module global metadata for module initialization x86/virt/tdx: Add placeholder to construct TDMRs to cover all TDX
memory regions
x86/virt/tdx: Fill out TDMRs to cover all TDX memory regions x86/virt/tdx: Allocate and set up PAMTs for TDMRs x86/virt/tdx: Designate reserved areas for all TDMRs x86/virt/tdx: Configure TDX module with the TDMRs and global KeyID x86/virt/tdx: Configure global KeyID on all packages x86/virt/tdx: Initialize all TDMRs
x86/kexec: Flush cache of TDX private memory x86/virt/tdx: Keep TDMRs when module initialization is successful x86/virt/tdx: Improve readability of module initialization error
handling
x86/kexec(): Reset TDX private memory on platforms with TDX erratum x86/virt/tdx: Handle TDX interaction with ACPI S3 and deeper states x86/mce: Improve error log of kernel space TDX #MC due to erratum Documentation/x86: Add documentation for TDX host support

 Documentation/arch/x86/tdx.rst     |  222 +++-
 arch/x86/Kconfig                   |    3 +
 arch/x86/coco/tdx/tdx-shared.c     |    6 +-
 arch/x86/include/asm/cpufeatures.h |    1 +
 arch/x86/include/asm/msr-index.h   |    3 +
 arch/x86/include/asm/shared/tdx.h  |    6 +
 arch/x86/include/asm/tdx.h         |   39 +
 arch/x86/kernel/cpu/intel.c        |   17 +
 arch/x86/kernel/cpu/mce/core.c     |   33 +
 arch/x86/kernel/machine_kexec_64.c |   16 +
 arch/x86/kernel/process.c          |    8 +-
 arch/x86/kernel/reboot.c           |   15 +
 arch/x86/kernel/setup.c            |    2 +
 arch/x86/virt/vmx/tdx/Makefile     |    2 +-
 arch/x86/virt/vmx/tdx/tdx.c        | 1555 ++++++++++++++++++++++++++++
 arch/x86/virt/vmx/tdx/tdx.h        |  121 +++
 16 files changed, 2033 insertions(+), 16 deletions(-)
 create mode 100644 arch/x86/virt/vmx/tdx/tdx.c
 create mode 100644 arch/x86/virt/vmx/tdx/tdx.h

base-commit: 6bc986ab839c844e78a2333a02e55f02c9e57935

2.41.0