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authorPawan Gupta <pawan.kumar.gupta@linux.intel.com>2019-10-23 12:28:57 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-11-16 10:27:51 +0100
commitf6eabafe0fa2a007219af36340414f961bedde9d (patch)
tree3a3a7521d2d9d72823b2fdfba35904b901f1a151 /Documentation
parent5b3b71385e07830aab9ee1c6f03bf140736e1fdc (diff)
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x86/tsx: Add "auto" option to the tsx= cmdline parameter
commit 7531a3596e3272d1f6841e0d601a614555dc6b65 upstream. 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> [bwh: Backported to 4.4: adjust filename] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 58421b7f62b0..49dd31f30022 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -4073,6 +4073,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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/hw-vuln/tsx_async_abort.rst