[kvm-unit-tests PATCH v7 0/5] x86: Add test cases for LAM

[Binbin Wu <binbin.wu@linux.intel.com>]

Intel Linear-address masking (LAM) [1], modifies the checking that is applied to
*64-bit* linear addresses, allowing software to use of the untranslated address
bits for metadata.

The patch series add test cases for KVM LAM:

Patch 1 moves struct invpcid_desc to header file for new test cases.
Patch 2 makes change to allow setting of CR3 LAM bits in vmlaunch tests.
Patch 3~5 add test cases for LAM supervisor mode and user mode, including:
- For supervisor mode
  CR4.LAM_SUP toggle
  Memory/MMIO access with tagged pointer
  INVLPG
  INVPCID
  INVVPID (also used to cover VMX instruction VMExit path)
- For user mode
  CR3 LAM bits toggle 
  Memory/MMIO access with tagged pointer

[1] Intel ISE https://cdrdv2.intel.com/v1/dl/getContent/671368
    Chapter Linear Address Masking (LAM)
---
Changelog:
v7
- Move struct invpcid_desc to header file instead of defining a new copy in lam.c.
- Rename is_la57()/lam_sup_active() to is_la57_enabled()/is_lam_sup_enabled(),
  and move them to processor.h (Sean)
- Drop cr4_set_lam_sup()/cr4_clear_lam_sup() and use write_cr4_safe() instead. (Sean)
- Add get_lam_mask() to get lam status based on the address and vCPU state. (Sean)
- Drop the wrappers for INVLPG since INVLPG never faults. (Sean)
- Drop the wrapper for INVPCID and use invpcid_safe() instead. (Sean)
- Drop the check for X86_FEATURE_PCID. (Sean)
- Rename lam_{u48,u57}_active() to is_lam_{u48,u57}_enabled(), and move them to
  processor.h (Sean)
- Test LAM userspace address in kernel mode directly to simplify the interface
  of test_ptr() since LAM identifies a address as kernel or user only based on
  the address itself.
- Add comments about the virtualization hole of CR3 LAM bits.
- Drop the check of X86_FEATURE_LA57 when check LA57. (Sean)

v6
- https://lore.kernel.org/kvm/20240122085354.9510-1-binbin.wu@linux.intel.com/

v5
- https://lore.kernel.org/kvm/20230530024356.24870-1-binbin.wu@linux.intel.com/

Binbin Wu (4):
  x86: Move struct invpcid_desc to processor.h
  x86: Allow setting of CR3 LAM bits if LAM supported
  x86: Add test cases for LAM_{U48,U57}
  x86: Add test case for INVVPID with LAM

Robert Hoo (1):
  x86: Add test case for LAM_SUP

 lib/x86/processor.h |  41 +++++++
 x86/Makefile.x86_64 |   1 +
 x86/lam.c           | 281 ++++++++++++++++++++++++++++++++++++++++++++
 x86/pcid.c          |   6 -
 x86/unittests.cfg   |  10 ++
 x86/vmx_tests.c     |  51 +++++++-
 6 files changed, 382 insertions(+), 8 deletions(-)
 create mode 100644 x86/lam.c


base-commit: d301d0187f5db09531a1c2c7608997cc3b0a5c7d
-- 
2.43.2