x86/speculation: Add prctl for Speculative Store Bypass mitigation

[sfrench/cifs-2.6.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f32112c55f7e250475322a023243b6cf12e6d1ba..a8d2ae1e335bd3dd8878d3df3271b8ce529ca597 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4053,7 +4053,11 @@
                        off    - Unconditionally enable Speculative Store Bypass
                        auto   - Kernel detects whether the CPU model contains an
                                 implementation of Speculative Store Bypass and
-                                picks the most appropriate mitigation
+                                picks the most appropriate mitigation.
+                       prctl  - Control Speculative Store Bypass per thread
+                                via prctl. Speculative Store Bypass is enabled
+                                for a process by default. The state of the control
+                                is inherited on fork.
 
                        Not specifying this option is equivalent to
                        spec_store_bypass_disable=auto.