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: NShannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: NAndrew Jones <drjones@redhat.com>
Message-id: 1465267577-1808-2-git-send-email-zhaoshenglong@huawei.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

target-arm/cpu.h

@@ -572,6 +572,8 @@ struct ARMCPU {
     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;

target-arm/kvm64.c

@@ -461,6 +461,11 @@ int kvm_arch_init_vcpu(CPUState *cs)
     if (!arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
         cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_EL1_32BIT;
     }
+    if (kvm_irqchip_in_kernel() &&
+        kvm_check_extension(cs->kvm_state, KVM_CAP_ARM_PMU_V3)) {
+        cpu->has_pmu = true;
+        cpu->kvm_init_features[0] |= 1 << KVM_ARM_VCPU_PMU_V3;
+    }
 
     /* Do KVM_ARM_VCPU_INIT ioctl */
     ret = kvm_arm_vcpu_init(cs);