path: root/Documentation
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authorDave Hansen <dave.hansen@linux.intel.com>2014-12-12 10:38:36 -0800
committerThomas Gleixner <tglx@linutronix.de>2014-12-15 15:58:57 +0100
commit72e9b5fe9bee0826e7ce7599adbdc64e544780ef (patch)
treece252b251b1ca1732b9eaba4f5361d9d793b7828 /Documentation
parentx86, mpx: Update documentation (diff)
x86, mpx: Give MPX a real config option prompt
Give MPX a real config option. The CPUs that support it (referenced here): https://software.intel.com/en-us/forums/topic/402393 are not available publicly yet. Right now only the software emulator provides MPX for the general public. [ tglx: Make it default off. There is no point in having it on right now as no hardware and no proper tooling support are available ] Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dave Hansen <dave@sr71.net> Link: http://lkml.kernel.org/r/20141212183836.2569D58D@viggo.jf.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation')
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/x86/intel_mpx.txt b/Documentation/x86/intel_mpx.txt
index 6ca6e2bd9ae9..818518a3ff01 100644
--- a/Documentation/x86/intel_mpx.txt
+++ b/Documentation/x86/intel_mpx.txt
@@ -7,11 +7,15 @@ that can be used in conjunction with compiler changes to check memory
references, for those references whose compile-time normal intentions are
usurped at runtime due to buffer overflow or underflow.
+You can tell if your CPU supports MPX by looking in /proc/cpuinfo:
+ cat /proc/cpuinfo | grep ' mpx '
For more information, please refer to Intel(R) Architecture Instruction
Set Extensions Programming Reference, Chapter 9: Intel(R) Memory Protection
-Note: Currently no hardware with MPX ISA is available but it is always
+Note: As of December 2014, no hardware with MPX is available but it is
possible to use SDE (Intel(R) Software Development Emulator) instead, which
can be downloaded from