selftests: KVM: Add exponent check for boolean stats

The only sensible exponent for a boolean stat is 0. Add a test assertion
requiring all boolean statistics to have an exponent of 0.

Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Andrew Jones <andrew.jones@linux.dev>
Message-Id: <20220719143134.3246798-4-oliver.upton@linux.dev>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/kvm_binary_stats_test.c

@@ -96,6 +96,7 @@ static void stats_test(int stats_fd)
 		 * Exponent for unit seconds should be less than or equal to 0
 		 * Exponent for unit clock cycles should be greater than or
 		 * equal to 0
+		 * Exponent for unit boolean should be 0
 		 */
 		switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
 		case KVM_STATS_UNIT_NONE:
@@ -110,6 +111,11 @@ static void stats_test(int stats_fd)
 				    "Unsupported KVM stats (%s) exponent: %i",
 				    pdesc->name, pdesc->exponent);
 			break;
+		case KVM_STATS_UNIT_BOOLEAN:
+			TEST_ASSERT(pdesc->exponent == 0,
+				    "Unsupported KVM stats (%s) exponent: %d",
+				    pdesc->name, pdesc->exponent);
+			break;
 		}
 
 		/* Check size field, which should not be zero */