| From 97259e58b13d36685094ed497517a8f073f8495b Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Tue, 29 Oct 2019 12:07:59 -0700 |
| Subject: powerpc/security/book3s64: Report L1TF status in sysfs |
| |
| 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 a5c5940d970a..a4354c4f6bc5 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) |
| -- |
| 2.20.1 |
| |
