[PATCH RESEND v2 2/6] target/arm/kvm: Add helper to detect el2 when using KVM

[Haibo Xu]

Signed-off-by: Haibo Xu <haibo.xu@linaro.org>
---
 target/arm/kvm64.c   |  5 +++++
 target/arm/kvm_arm.h | 13 +++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c
index dff85f6db9..9cacaf2eb8 100644
--- a/target/arm/kvm64.c
+++ b/target/arm/kvm64.c
@@ -721,6 +721,11 @@ bool kvm_arm_steal_time_supported(void)
     return kvm_check_extension(kvm_state, KVM_CAP_STEAL_TIME);
 }
 
+bool kvm_arm_el2_supported(void)
+{
+    return kvm_check_extension(kvm_state, KVM_CAP_ARM_EL2);
+}
+
 QEMU_BUILD_BUG_ON(KVM_ARM64_SVE_VQ_MIN != 1);
 
 void kvm_arm_sve_get_vls(CPUState *cs, unsigned long *map)
diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index 34f8daa377..7d7fc7981b 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -285,6 +285,14 @@ void kvm_arm_steal_time_finalize(ARMCPU *cpu, Error 
**errp);
  */
 bool kvm_arm_steal_time_supported(void);
 
+/**
+ * kvm_arm_el2_supported:
+ *
+ * Returns: true if KVM can enable el2(nested virtualization)
+ * and false otherwise.
+ */
+bool kvm_arm_el2_supported(void);
+
 /**
  * kvm_arm_aarch32_supported:
  *
@@ -398,6 +406,11 @@ static inline bool kvm_arm_steal_time_supported(void)
     return false;
 }
 
+static inline bool kvm_arm_el2_supported(void)
+{
+    return false;
+}
+
 /*
  * These functions should never actually be called without KVM support.
  */
-- 
2.17.1