x86/speculation/l1tf: Document l1tf in sysfs

The vulnerabilties/l1tf attribute was added by commit 17dbca119312
"x86/speculation/l1tf: Add sysfs reporting for l1tf", which has
already been backported to 3.16, but only documented in commit
d90a7a0ec83f "x86/bugs, kvm: Introduce boot-time control of L1TF
mitigations", which has not and probbaly won't be.

Add just that line of documentation for now.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 50f9568..3f727d9 100644 (file)
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -277,6 +277,7 @@ What:               /sys/devices/system/cpu/vulnerabilities
                /sys/devices/system/cpu/vulnerabilities/spectre_v1
                /sys/devices/system/cpu/vulnerabilities/spectre_v2
                /sys/devices/system/cpu/vulnerabilities/spec_store_bypass
+               /sys/devices/system/cpu/vulnerabilities/l1tf
 Date:          January 2018
 Contact:       Linux kernel mailing list <linux-kernel@vger.kernel.org>
 Description:   Information about CPU vulnerabilities