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    Subject[PATCH AUTOSEL 4.19 21/79] powerpc/security/book3s64: Report L1TF status in sysfs
    Date
    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 a5c5940d970ab..a4354c4f6bc50 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
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