From: Anthony Steinhauser <asteinhau...@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 <asteinhau...@google.com> Signed-off-by: Michael Ellerman <m...@ellerman.id.au> [mpe: Just have cpu_show_l1tf() call cpu_show_meltdown() directly] Link: https://lore.kernel.org/r/20191029190759.84821-1-asteinhau...@google.com Signed-off-by: Sasha Levin <sas...@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 11fff9669cfdf..db66f25c190c9 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -161,6 +161,11 @@ 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) -- 2.20.1
