From: Anthony Steinhauser asteinhauser@google.com
[ Upstream commit 8e6b6da91ac9b9ec5a925b6cb13f287a54bd547d ]
Some PowerPC CPUs are vulnerable to L1TF to the same extent as to Meltdown. It is also mitigated by flushing the L1D on privilege transition.
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 T2P9D01.
Signed-off-by: Anthony Steinhauser asteinhauser@google.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au [mpe: Just have cpu_show_l1tf() call cpu_show_meltdown() directly] Link: https://lore.kernel.org/r/20191029190759.84821-1-asteinhauser@google.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/kernel/security.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c index f5d6541bf8c2..fef3f09fc238 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -160,6 +160,11 @@ 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); +} #endif
ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf)