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 -- 2.25.1
