x86/entry/64: Document GSBASE handling in the paranoid path
authorChang S. Bae <chang.seok.bae@intel.com>
Wed, 8 May 2019 10:02:28 +0000 (03:02 -0700)
committerThomas Gleixner <tglx@linutronix.de>
Sat, 22 Jun 2019 09:38:55 +0000 (11:38 +0200)
commit5bf0cab60ee2c730ec91ae0aabc3146bcfed138b
treee3eba1af6c79aa6ce8e25fa0d921c3a7a76f3a09
parent708078f65721b46d82d9934a3f0b36a2b8ad0656
x86/entry/64: Document GSBASE handling in the paranoid path

On a FSGSBASE system, the way to handle GSBASE in the paranoid path is
different from the existing SWAPGS-based entry/exit path handling. Document
the reason and what has to be done for FSGSBASE enabled systems.

[ tglx: Massaged doc and changelog ]

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: 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/1557309753-24073-14-git-send-email-chang.seok.bae@intel.com
Documentation/x86/entry_64.rst