powerpc/fsl: Update Spectre v2 reporting

dmcraciun · mpe · commit dfa88658fb05 · 2018-12-20T22:59:03.000+11:00
Report branch predictor state flush as a mitigation for
Spectre variant 2.

Signed-off-by: Diana Craciun &lt;diana.craciun@nxp.com&gt;
Signed-off-by: Michael Ellerman &lt;mpe@ellerman.id.au&gt;
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
@@ -213,8 +213,11 @@ 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");
 
