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x86/tsx: Add "auto" option to the tsx= cmdline parameter

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Platforms which are not affected by X86_BUG_TAA may want the TSX feature
enabled. Add "auto" option to the TSX cmdline parameter. When tsx=auto
disable TSX when X86_BUG_TAA is present, otherwise enable TSX.

More details on X86_BUG_TAA can be found here:
https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html

 [ bp: Extend the arg buffer to accommodate "auto\0". ]

Signed-off-by: Pawan Gupta <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Tony Luck <[email protected]>
Reviewed-by: Josh Poimboeuf <[email protected]>
This commit is contained in:
Pawan Gupta 2019-10-23 12:28:57 +02:00 • committed by Thomas Gleixner
commit 7531a3596e
2 changed files with 9 additions and 1 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@ -4869,6 +4869,9 @@
update. This new MSR allows for the reliable
deactivation of the TSX functionality.)
auto - Disable TSX if X86_BUG_TAA is present,
otherwise enable TSX on the system.
Not specifying this option is equivalent to tsx=off.
See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst