[PULL 28/36] target/arm/kvm: Add helper to detect EL2 when using KVM

[Peter Maydell]

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

Introduce query support for KVM_CAP_ARM_EL2.

Signed-off-by: Haibo Xu <haibo...@linaro.org>
Signed-off-by: Miguel Luis <miguel.l...@oracle.com>
Signed-off-by: Eric Auger <eric.au...@redhat.com>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <phi...@linaro.org>
Message-id: 20250707164129.1167837-3-eric.au...@redhat.com
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
 target/arm/kvm_arm.h  | 7 +++++++
 target/arm/kvm-stub.c | 5 +++++
 target/arm/kvm.c      | 5 +++++
 3 files changed, 17 insertions(+)

diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index 7dc83caed5c..b4cad051551 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -191,6 +191,13 @@ 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
diff --git a/target/arm/kvm-stub.c b/target/arm/kvm-stub.c
index 34e57fab011..c93462c5b9b 100644
--- a/target/arm/kvm-stub.c
+++ b/target/arm/kvm-stub.c
@@ -47,6 +47,11 @@ bool kvm_arm_mte_supported(void)
     return false;
 }
 
+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 8ab0d692d36..9fdf354f3bc 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -1763,6 +1763,11 @@ 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);
-- 
2.43.0