From: Michael Ellerman <mpe@ellerman.id.au>
To: corbet@lwn.net
Cc: keescook@chromium.org, tglx@linutronix.de,
konrad.wilk@oracle.com, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org
Subject: [PATCH] Documentation: Add powerpc options for spec_store_bypass_disable
Date: Tue, 10 Jul 2018 12:08:36 +1000 [thread overview]
Message-ID: <20180710020836.23571-1-mpe@ellerman.id.au> (raw)
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>
---
Documentation/admin-guide/kernel-parameters.txt | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
I tried documenting the differences between the PPC options and X86 ones in one
section, but it got quite messy, so I went with this instead. Happy to take
advice on how better to structure it if anyone has opinions.
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index efc7aa7a0670..f320c7168b04 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=
--
2.14.1
next reply other threads:[~2018-07-10 2:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-10 2:08 Michael Ellerman [this message]
2018-07-10 3:19 ` [PATCH] Documentation: Add powerpc options for spec_store_bypass_disable Kees Cook
2018-07-10 6:10 ` Thomas Gleixner
2018-07-10 21:13 ` Jonathan Corbet
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