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 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 | 7 + x86/Makefile.x86_64 | 1 + x86/lam.c | 315 ++++++++++++++++++++++++++++++++++++++++++++ x86/unittests.cfg | 10 ++ x86/vmx_tests.c | 66 +++++++++- 5 files changed, 398 insertions(+), 1 deletion(-) create mode 100644 x86/lam.c -- 2.25.1
