target-arm: kvm64: set guest PMUv3 feature bit if supported

Check if kvm supports guest PMUv3. If so, set the corresponding feature
bit for vcpu.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-id: 1465267577-1808-2-git-send-email-zhaoshenglong@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 17d8051..942aa36 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -572,6 +572,8 @@
     bool powered_off;
     /* CPU has security extension */
     bool has_el3;
+    /* CPU has PMU (Performance Monitor Unit) */
+    bool has_pmu;
 
     /* CPU has memory protection unit */
     bool has_mpu;