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authorPawan Gupta <pawan.kumar.gupta@linux.intel.com>2019-10-23 12:28:57 +0200
committerThomas Gleixner <tglx@linutronix.de>2019-10-28 08:37:00 +0100
commit7531a3596e3272d1f6841e0d601a614555dc6b65 (patch)
treeb58244f08cec9c20ff369094032e2ceea595e335 /Documentation
parente1d38b63acd843cfdd4222bf19a26700fd5c699e (diff)
x86/tsx: Add "auto" option to the tsx= cmdline parameter
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 <pawan.kumar.gupta@linux.intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index af4b1d95b08f..6e548cddb6c3 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -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