[RFC v4 3/5] target/arm/kvm: Add helper to detect EL2 when using KVM

[Eric Auger]

From: Haibo Xu <haibo.xu@linaro.org>

Introduce query support for KVM_CAP_ARM_EL2.

Signed-off-by: Haibo Xu <haibo.xu@linaro.org>
Signed-off-by: Miguel Luis <miguel.luis@oracle.com>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 target/arm/kvm_arm.h | 12 ++++++++++++
 target/arm/kvm.c     |  5 +++++
 2 files changed, 17 insertions(+)

diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index 05c3de8cd4..8c1314da20 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -193,6 +193,13 @@ bool kvm_arm_sve_supported(void);
  */
 bool kvm_arm_mte_supported(void);
 
+/**
+ * kvm_arm_el2_supported:
+ *
+ * Returns true if KVM can enable EL2 and false otherwise.
+ */
+bool kvm_arm_el2_supported(void);
+
 /**
  * kvm_arm_get_max_vm_ipa_size:
  * @ms: Machine state handle
@@ -247,6 +254,11 @@ static inline bool kvm_arm_mte_supported(void)
     return false;
 }
 
+static inline bool kvm_arm_el2_supported(void)
+{
+    return false;
+}
+
 /*
  * These functions should never actually be called without KVM support.
  */
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index a9444a2c7a..43362164eb 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -1797,6 +1797,11 @@ bool kvm_arm_aarch32_supported(void)
     return kvm_check_extension(kvm_state, KVM_CAP_ARM_EL1_32BIT);
 }
 
+bool kvm_arm_el2_supported(void)
+{
+    return kvm_check_extension(kvm_state, KVM_CAP_ARM_EL2);
+}
+
 bool kvm_arm_sve_supported(void)
 {
     return kvm_check_extension(kvm_state, KVM_CAP_ARM_SVE);
-- 
2.47.1