powerpc/fsl: Update Spectre v2 reporting

commit dfa88658fb0583abb92e062c7a9cd5a5b94f2a46 upstream.

Report branch predictor state flush as a mitigation for
Spectre variant 2.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index 4393a38..861fab3 100644 (file)
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -212,8 +212,11 @@ ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, c
 
                if (count_cache_flush_type == COUNT_CACHE_FLUSH_HW)
                        seq_buf_printf(&s, "(hardware accelerated)");
-       } else
+       } else if (btb_flush_enabled) {
+               seq_buf_printf(&s, "Mitigation: Branch predictor state flush");
+       } else {
                seq_buf_printf(&s, "Vulnerable");
+       }
 
        seq_buf_printf(&s, "\n");