[RFC PATCH v3 15/19] target/arm/kvm: introduce kvm_arm_get_host_isar helper

Introduce kvm_arm_get_host_isar() to provide scratch vCPU probed host
isar. Will be used in future commits.

Signed-off-by: Khushit Shah <[email protected]>
---
 target/arm/kvm-stub.c | 5 +++++
 target/arm/kvm.c      | 8 ++++++++
 target/arm/kvm_arm.h  | 4 ++++
 3 files changed, 17 insertions(+)

diff --git a/target/arm/kvm-stub.c b/target/arm/kvm-stub.c
index 88cbe8d85c..dd683beaaf 100644
--- a/target/arm/kvm-stub.c
+++ b/target/arm/kvm-stub.c
@@ -119,3 +119,8 @@ char *kvm_print_register_name(uint64_t regidx)
 {
     g_assert_not_reached();
 }
+
+const ARMISARegisters *kvm_arm_get_host_isar(void)
+{
+    return NULL;
+}
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index 8f452f9570..042d5fe804 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -650,6 +650,14 @@ void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
     env->features = arm_host_cpu_features.features;
 }
 
+const ARMISARegisters *kvm_arm_get_host_isar(void)
+{
+    if (!arm_host_cpu_features.dtb_compatible) {
+        kvm_arm_get_host_cpu_features(&arm_host_cpu_features);
+    }
+    return &arm_host_cpu_features.isar;
+}
+
 static bool kvm_no_adjvtime_get(Object *obj, Error **errp)
 {
     return !ARM_CPU(obj)->kvm_adjvtime;
diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index 9f15c91c4e..4a04d72e39 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -15,6 +15,8 @@
 #include "system/kvm.h"
 #include "target/arm/cpu-qom.h"
 
+typedef struct ARMISARegisters ARMISARegisters;
+
 #define KVM_ARM_VGIC_V2   (1 << 0)
 #define KVM_ARM_VGIC_V3   (1 << 1)
 
@@ -257,6 +259,8 @@ void kvm_arm_enable_mte(Object *cpuobj, Error **errp);
 
 void arm_cpu_kvm_set_irq(void *arm_cpu, int irq, int level);
 
+const ARMISARegisters *kvm_arm_get_host_isar(void);
+
 void arm_gic_cap_kvm_probe(GICCapability *v2, GICCapability *v3);
 
 /*
-- 
2.52.0