selftests/powerpc: Better reporting in spectre_v2

In commit f3054ffd ("selftests/powerpc: Return skip code for
spectre_v2"), the spectre_v2 selftest is updated to be aware of cases
where the vulnerability status reported in sysfs is incorrect, skipping
the test instead.

This happens because qemu can misrepresent the mitigation status of the
host to the guest. If the count cache is disabled in the host, and this
is correctly reported to the guest, then the guest won't apply
mitigations. If the guest is then migrated to a new host where
mitigations are necessary, it is now vulnerable because it has not
applied mitigations.

Update the selftest to report when we see excessive misses, indicative of
the count cache being disabled. If software flushing is enabled, also
warn that these flushes are just wasting performance.
Signed-off-by: Russell Currey <ruscur@russell.cc>
[mpe: Rebase and update change log appropriately]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210608064809.199116-1-ruscur@russell.cc

tools/testing/selftests/powerpc/security/spectre_v2.c

@@ -182,17 +182,23 @@ int spectre_v2_test(void)
 	case COUNT_CACHE_FLUSH_HW:
 		// These should all not affect userspace branch prediction
 		if (miss_percent > 15) {
+			if (miss_percent > 95) {
+				/*
+				 * Such a mismatch may be caused by a system being unaware
+				 * the count cache is disabled. This may be to enable
+				 * guest migration between hosts with different settings.
+				 * Return skip code to avoid detecting this as an error.
+				 * We are not vulnerable and reporting otherwise, so
+				 * missing such a mismatch is safe.
+				 */
+				printf("Branch misses > 95%% unexpected in this configuration.\n");
+				printf("Count cache likely disabled without Linux knowing.\n");
+				if (state == COUNT_CACHE_FLUSH_SW)
+					printf("WARNING: Kernel performing unnecessary flushes.\n");
+				return 4;
+			}
 			printf("Branch misses > 15%% unexpected in this configuration!\n");
 			printf("Possible mis-match between reported & actual mitigation\n");
-			/*
-			 * Such a mismatch may be caused by a guest system
-			 * reporting as vulnerable when the host is mitigated.
-			 * Return skip code to avoid detecting this as an error.
-			 * We are not vulnerable and reporting otherwise, so
-			 * missing such a mismatch is safe.
-			 */
-			if (miss_percent > 95)
-				return 4;
 
 			return 1;
 		}