[PATCH v4 00/12] Unify TDCALL/SEAMCALL and TDVMCALL assembly

[Kai Huang]

Hi Peter, Kirill,

This series unifies the assembly code for TDCALL/SEAMCALL and TDVMCALL.
Now all of them use one singe TDX_MODULE_CALL asm macro.  More
information please see cover letter of v2 (see link below).

Tested by booting TDX guest, initializing TDX module, and running TDX
guest successfully, all with this series applied.

------- Histroy --------

v3 -> v4:

 - Addressed Kirill's minor comments
 - Collected Reviewed-by tags from Kirill/Sathy.
 - Collected Isaku's Tested-by tag.
 - Removed unneeded header file inclusion in tdcall.S in the relevant
   two patches.
 - Rebased to latest tip/x86/tdx (v6.5-rc5).

v3: https://lore.kernel.org/lkml/20230806114131.2ilofgmxhdaa2u6b@xxxxxxxxxxxxxxxxx/T/

v2 -> v3:

 - New patch (patch 12) to adjust 'struct tdx_module_args' layout to
   match KVM's "vcpu::regs[]" for VP.ENTER. (Peter)
 - Added __seamcall_saved_ret() wrapper to support VP.ENTER (merged to
   patch 10).
 - Fixed a 'noinstr' check build regression found by LKP (patch 7).
 - Rebased to latest Linus's tree (6.5-rc3 + 2 commits).

v2: https://lore.kernel.org/lkml/a23ce8fd289141cea3a1b4f3dace221dca847238.camel@xxxxxxxxx/T/

v1 -> v2:
 - Rebased to 6.5-rc2.
 - Fixed comments from Peter and others.
 - Split patch "x86/tdx: Unify TDX_HYPERCALL and TDX_MODULE_CALL assembly"
   into three smaller patches for better review.
 - A new patch to skip saving output registers when SEAMCALL fails due to
   VMFailInvalid.  
 - Removed patch "x86/tdx: Use cmovc to save a label in TDX_MODULE_CALL asm"
 - Merged patch "x86/tdx: Move FRAME_BEGIN/END to TDX_MODULE_CALL asm macro"
   to the new patch mentioned above.

v1: https://lore.kernel.org/lkml/b95c4169-88c8-219e-87b7-6c4e058c246a@xxxxxxxx/T/



Kai Huang (12):
  x86/tdx: Zero out the missing RSI in TDX_HYPERCALL macro
  x86/tdx: Skip saving output regs when SEAMCALL fails with
    VMFailInvalid
  x86/tdx: Make macros of TDCALLs consistent with the spec
  x86/tdx: Rename __tdx_module_call() to __tdcall()
  x86/tdx: Pass TDCALL/SEAMCALL input/output registers via a structure
  x86/tdx: Extend TDX_MODULE_CALL to support more TDCALL/SEAMCALL leafs
  x86/tdx: Make TDX_HYPERCALL asm similar to TDX_MODULE_CALL
  x86/tdx: Reimplement __tdx_hypercall() using TDX_MODULE_CALL asm
  x86/tdx: Remove 'struct tdx_hypercall_args'
  x86/virt/tdx: Wire up basic SEAMCALL functions
  x86/virt/tdx: Make TDX_MODULE_CALL handle SEAMCALL #UD and #GP
  x86/virt/tdx: Adjust 'struct tdx_module_args' to use x86 "register
    index" layout

 arch/x86/Kconfig                  |  12 ++
 arch/x86/Makefile                 |   2 +
 arch/x86/boot/compressed/tdx.c    |   6 +-
 arch/x86/coco/tdx/tdcall.S        | 234 ++++--------------------------
 arch/x86/coco/tdx/tdx-shared.c    |  28 +++-
 arch/x86/coco/tdx/tdx.c           |  71 +++++----
 arch/x86/include/asm/shared/tdx.h |  92 +++++++-----
 arch/x86/include/asm/tdx.h        |  11 ++
 arch/x86/kernel/asm-offsets.c     |  33 ++---
 arch/x86/virt/Makefile            |   2 +
 arch/x86/virt/vmx/Makefile        |   2 +
 arch/x86/virt/vmx/tdx/Makefile    |   2 +
 arch/x86/virt/vmx/tdx/seamcall.S  |  61 ++++++++
 arch/x86/virt/vmx/tdx/tdxcall.S   | 230 ++++++++++++++++++++++-------
 14 files changed, 435 insertions(+), 351 deletions(-)
 create mode 100644 arch/x86/virt/Makefile
 create mode 100644 arch/x86/virt/vmx/Makefile
 create mode 100644 arch/x86/virt/vmx/tdx/Makefile
 create mode 100644 arch/x86/virt/vmx/tdx/seamcall.S


base-commit: 52a93d39b17dc7eb98b6aa3edb93943248e03b2f
-- 
2.41.0