selftests/x86/fsgsbase: Test RD/WRGSBASE

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This validates that GS and GSBASE are independently preserved across
context switches.

[ chang: Use FSGSBASE instructions directly instead of .byte ]

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Link: https://lkml.kernel.org/r/1557309753-24073-15-git-send-email-chang.seok.bae@intel.com

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Andy Lutomirski 2019-05-08 03:02:29 -07:00 • committed by Thomas Gleixner

parent 5bf0cab60e

commit 9ad75a0922

1 changed files with 99 additions and 3 deletions

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tools/testing/selftests/x86/fsgsbase.c

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