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 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 | 58 +++++++- 5 files changed, 401 insertions(+), 2 deletions(-) create mode 100644 x86/lam.c base-commit: 02d8befe99f8205d4caea402d8b0800354255681 -- 2.25.1
