diff --git a/target/riscv/kvm.c b/target/riscv/kvm.c
index 4d7476cf15..fd22ef4162 100644
--- a/target/riscv/kvm.c
+++ b/target/riscv/kvm.c
@@ -215,11 +215,15 @@ static KVMCPUConfig kvm_multi_ext_cfgs[] = {
     KVM_EXT_CFG("svpbmt", ext_svpbmt, KVM_RISCV_ISA_EXT_SVPBMT),
 };
 
+static void *kvmconfig_get_cfg_addr(RISCVCPU *cpu, KVMCPUConfig *kvmcfg)
+{
+    return (void *)&cpu->cfg + kvmcfg->offset;
+}
+
 static void kvm_cpu_cfg_set(RISCVCPU *cpu, KVMCPUConfig *multi_ext,
                             uint32_t val)
 {
-    int cpu_cfg_offset = multi_ext->offset;
-    bool *ext_enabled = (void *)&cpu->cfg + cpu_cfg_offset;
+    bool *ext_enabled = kvmconfig_get_cfg_addr(cpu, multi_ext);
 
     *ext_enabled = val;
 }
@@ -227,8 +231,7 @@ static void kvm_cpu_cfg_set(RISCVCPU *cpu, KVMCPUConfig *multi_ext,
 static uint32_t kvm_cpu_cfg_get(RISCVCPU *cpu,
                                 KVMCPUConfig *multi_ext)
 {
-    int cpu_cfg_offset = multi_ext->offset;
-    bool *ext_enabled = (void *)&cpu->cfg + cpu_cfg_offset;
+    bool *ext_enabled = kvmconfig_get_cfg_addr(cpu, multi_ext);
 
     return *ext_enabled;
 }