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x86/cpu: Enable FSGSBASE on 64bit by default and add a chicken bit

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Now that FSGSBASE is fully supported, remove unsafe_fsgsbase, enable
FSGSBASE by default, and add nofsgsbase to disable it.

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lkml.kernel.org/r/1557309753-24073-17-git-send-email-chang.seok.bae@intel.com
Link: https://lkml.kernel.org/r/20200528201402.1708239-13-sashal@kernel.org
This commit is contained in:
Andy Lutomirski
2020-05-28 16:13:58 -04:00
committed by Thomas Gleixner
parent c82965f9e5
commit b745cfba44
2 changed files with 15 additions and 20 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@@ -3079,8 +3079,7 @@
no5lvl [X86-64] Disable 5-level paging mode. Forces
kernel to use 4-level paging instead.
unsafe_fsgsbase [X86] Allow FSGSBASE instructions. This will be
replaced with a nofsgsbase flag.
nofsgsbase [X86] Disables FSGSBASE instructions.
no_console_suspend
[HW] Never suspend the console