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x86/cpu: Add 'unsafe_fsgsbase' to enable CR4.FSGSBASE

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This is temporary.  It will allow the next few patches to be tested
incrementally.

Setting unsafe_fsgsbase is a root hole.  Don't do 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>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/1557309753-24073-4-git-send-email-chang.seok.bae@intel.com
Link: https://lkml.kernel.org/r/20200528201402.1708239-3-sashal@kernel.org
This commit is contained in:
Andy Lutomirski
2020-05-28 16:13:48 -04:00
committed by Thomas Gleixner
parent fddf8ba1e4
commit dd649bd0b3
2 changed files with 27 additions and 0 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@@ -3079,6 +3079,9 @@
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.
no_console_suspend
[HW] Never suspend the console
Disable suspending of consoles during suspend and