selftests/x86/lam: Add inherit test cases for linear-address masking

Browse source

LAM is enabled per-thread and gets inherited on fork(2)/clone(2). exec()
reverts LAM status to the default disabled state.

There are two test scenarios:

 - Fork test cases:

   These cases were used to test the inheritance of LAM for per-thread,
   Child process generated by fork() should inherit LAM feature from
   parent process, Child process can get the LAM mode same as parent
   process.

 - Execve test cases:

   Processes generated by execve() are different from processes
   generated by fork(), these processes revert LAM status to disabled
   status.

Signed-off-by: Weihong Zhang <weihong.zhang@intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20230312112612.31869-16-kirill.shutemov%40linux.intel.com

...

This commit is contained in:

Weihong Zhang 2023-03-12 14:26:10 +03:00 • committed by Dave Hansen

parent 72fd6d738c

commit 833c12ce0f

1 changed files with 121 additions and 4 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

125

tools/testing/selftests/x86/lam.c

View file