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[v5,0/4] x86: Add test cases for LAM

Message ID 20230530024356.24870-1-binbin.wu@linux.intel.com (mailing list archive)
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Series x86: Add test cases for LAM | expand

Message

Binbin Wu May 30, 2023, 2:43 a.m. UTC 
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 makes change to allow setting of CR3 LAM bits in vmlaunch tests.
Patch 2~4 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
v4 --> v5:
- LAM doesn't apply to the target linear address in the INVVPID descriptor.
  Change the test cases in patch 4 accordingly. Dropped the reviewed-by from Chao due to the change.

v3 --> v4:
- Remove an extra space in patch 1.
- Remove an unnecessary local variable in patch 2.
- Add some comments about the linear address used for LAM tests in patch 2 and patch 3.
- Add a static assert to check the physical address range for LAM user mode tests in patch 3.
- Remove the unnecessary identical mapping code in patch 3.
- Move common definitions and helper function to header file in patch 2.
- LAM test of INVVPID is tested only when individual-address invalidation is supported in patch 4.
- Add reviewed-by from Chao Gao in patch 2~4.

v2 --> v3:
- Simplify the implementation of set_metadata() (Suggested by Chao Gao)
- Move definition of X86_FEATURE_LAM to patch 1.
- Remove strcpy case and unify memory & MMIO address access using MOV instruction.
- Some code cleanups.
- Add reviewed-by from Chao Gao in patch 1. 

v1 --> v2:
- Add cases to test INVLPG, INVPCID, INVVPID with LAM_SUP
- Add cases to test LAM_{U48,U57}

Binbin Wu (3):
  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 |  15 +++
 x86/Makefile.x86_64 |   1 +
 x86/lam.c           | 319 ++++++++++++++++++++++++++++++++++++++++++++
 x86/unittests.cfg   |  10 ++
 x86/vmx_tests.c     |  52 +++++++-
 5 files changed, 395 insertions(+), 2 deletions(-)
 create mode 100644 x86/lam.c


base-commit: 02d8befe99f8205d4caea402d8b0800354255681