Documentation: Add powerpc options for spec_store_bypass_disable
Document the support for spec_store_bypass_disable that was added for
powerpc in commit a048a07d7f45 ("powerpc/64s: Add support for a store
forwarding barrier at kernel entry/exit").
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 533ff5c..4bb6004 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4060,6 +4060,8 @@
This parameter controls whether the Speculative Store
Bypass optimization is used.
+ On x86 the options are:
+
on - Unconditionally disable Speculative Store Bypass
off - Unconditionally enable Speculative Store Bypass
auto - Kernel detects whether the CPU model contains an
@@ -4075,12 +4077,20 @@
seccomp - Same as "prctl" above, but all seccomp threads
will disable SSB unless they explicitly opt out.
- Not specifying this option is equivalent to
- spec_store_bypass_disable=auto.
-
Default mitigations:
X86: If CONFIG_SECCOMP=y "seccomp", otherwise "prctl"
+ On powerpc the options are:
+
+ on,auto - On Power8 and Power9 insert a store-forwarding
+ barrier on kernel entry and exit. On Power7
+ perform a software flush on kernel entry and
+ exit.
+ off - No action.
+
+ Not specifying this option is equivalent to
+ spec_store_bypass_disable=auto.
+
spia_io_base= [HW,MTD]
spia_fio_base=
spia_pedr=