hw/arm/virt: Implement kvm-steal-time

We add the kvm-steal-time CPU property and implement it for machvirt.
A tiny bit of refactoring was also done to allow pmu and pvtime to
use the same vcpu device helper functions.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-id: 20201001061718.101915-7-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index f513702176..eb81b7059e 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -268,6 +268,24 @@ void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu);
 void kvm_arm_add_vcpu_properties(Object *obj);
 
 /**
+ * kvm_arm_steal_time_finalize:
+ * @cpu: ARMCPU for which to finalize kvm-steal-time
+ * @errp: Pointer to Error* for error propagation
+ *
+ * Validate the kvm-steal-time property selection and set its default
+ * based on KVM support and guest configuration.
+ */
+void kvm_arm_steal_time_finalize(ARMCPU *cpu, Error **errp);
+
+/**
+ * kvm_arm_steal_time_supported:
+ *
+ * Returns: true if KVM can enable steal time reporting
+ * and false otherwise.
+ */
+bool kvm_arm_steal_time_supported(void);
+
+/**
  * kvm_arm_aarch32_supported:
  *
  * Returns: true if KVM can enable AArch32 mode
@@ -340,6 +358,16 @@ int kvm_arm_vgic_probe(void);
 
 void kvm_arm_pmu_set_irq(CPUState *cs, int irq);
 void kvm_arm_pmu_init(CPUState *cs);
+
+/**
+ * kvm_arm_pvtime_init:
+ * @cs: CPUState
+ * @ipa: Per-vcpu guest physical base address of the pvtime structures
+ *
+ * Initializes PVTIME for the VCPU, setting the PVTIME IPA to @ipa.
+ */
+void kvm_arm_pvtime_init(CPUState *cs, uint64_t ipa);
+
 int kvm_arm_set_irq(int cpu, int irqtype, int irq, int level);
 
 #else
@@ -363,6 +391,11 @@ static inline bool kvm_arm_sve_supported(void)
     return false;
 }
 
+static inline bool kvm_arm_steal_time_supported(void)
+{
+    return false;
+}
+
 /*
  * These functions should never actually be called without KVM support.
  */
@@ -396,6 +429,16 @@ static inline void kvm_arm_pmu_init(CPUState *cs)
     g_assert_not_reached();
 }
 
+static inline void kvm_arm_pvtime_init(CPUState *cs, uint64_t ipa)
+{
+    g_assert_not_reached();
+}
+
+static inline void kvm_arm_steal_time_finalize(ARMCPU *cpu, Error **errp)
+{
+    g_assert_not_reached();
+}
+
 static inline void kvm_arm_sve_get_vls(CPUState *cs, unsigned long *map)
 {
     g_assert_not_reached();