blob: a642aa575e4acd1a728acd29d8e7ea71f6c450ce [file] [log] [blame]
From 4103b32c7b64609bff6f7ea18a5fe8e9314480aa Mon Sep 17 00:00:00 2001
From: Anthony Steinhauser <>
Date: Tue, 29 Oct 2019 12:07:59 -0700
Subject: [PATCH] powerpc/security/book3s64: Report L1TF status in sysfs
commit 8e6b6da91ac9b9ec5a925b6cb13f287a54bd547d upstream.
Some PowerPC CPUs are vulnerable to L1TF to the same extent as to
Meltdown. It is also mitigated by flushing the L1D on privilege
Currently the sysfs gives a false negative on L1TF on CPUs that I
verified to be vulnerable, a Power9 Talos II Boston 004e 1202, PowerNV
Signed-off-by: Anthony Steinhauser <>
Signed-off-by: Michael Ellerman <>
[mpe: Just have cpu_show_l1tf() call cpu_show_meltdown() directly]
Signed-off-by: Paul Gortmaker <>
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index bd91dceb7010..298a2e3ad6f4 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -168,6 +168,11 @@ ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, cha
return sprintf(buf, "Vulnerable\n");
+ssize_t cpu_show_l1tf(struct device *dev, struct device_attribute *attr, char *buf)
+ return cpu_show_meltdown(dev, attr, buf);
ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf)