Commit 8e6b6da9 authored Oct 29, 2019 by Anthony Steinhauser Committed by Michael Ellerman Nov 05, 2019

powerpc/security/book3s64: Report L1TF status in sysfs



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

parent 80c78428

arch/powerpc/kernel/security.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -167,6 +167,11 @@ 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)

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