target/arm/cpu: Ensure we can use the pmu with kvm

We first convert the pmu property from a static property to one with
its own accessors. Then we use the set accessor to check if the PMU is
supported when using KVM. Indeed a 32-bit KVM host does not support
the PMU, so this check will catch an attempt to use it at property-set
time.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index 98af1050a7..b3106c8600 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -217,6 +217,15 @@ void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu);
 bool kvm_arm_aarch32_supported(CPUState *cs);
 
 /**
+ * bool kvm_arm_pmu_supported:
+ * @cs: CPUState
+ *
+ * Returns: true if the KVM VCPU can enable its PMU
+ * and false otherwise.
+ */
+bool kvm_arm_pmu_supported(CPUState *cs);
+
+/**
  * kvm_arm_get_max_vm_ipa_size - Returns the number of bits in the
  * IPA address space supported by KVM
  *
@@ -261,6 +270,11 @@ static inline bool kvm_arm_aarch32_supported(CPUState *cs)
     return false;
 }
 
+static inline bool kvm_arm_pmu_supported(CPUState *cs)
+{
+    return false;
+}
+
 static inline int kvm_arm_get_max_vm_ipa_size(MachineState *ms)
 {
     return -ENOENT;