3 files changed, 15 insertions, 2 deletions
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 6b77aaa445..3e4e9f1873 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -939,6 +939,11 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
         cs->num_ases = 1;
     }
     cpu_address_space_init(cs, ARMASIdx_NS, "cpu-memory", cs->memory);
+
+    /* No core_count specified, default to smp_cpus. */
+    if (cpu->core_count == -1) {
+        cpu->core_count = smp_cpus;
+    }
 #endif
 
     qemu_init_vcpu(cs);
@@ -1765,6 +1770,7 @@ static Property arm_cpu_properties[] = {
     DEFINE_PROP_UINT64("mp-affinity", ARMCPU,
                         mp_affinity, ARM64_AFFINITY_INVALID),
     DEFINE_PROP_INT32("node-id", ARMCPU, node_id, CPU_UNSET_NUMA_NODE_ID),
+    DEFINE_PROP_INT32("core-count", ARMCPU, core_count, -1),
     DEFINE_PROP_END_OF_LIST()
 };
 
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 8dd6b788df..3fa8fdad21 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -745,6 +745,11 @@ struct ARMCPU {
     /* Uniprocessor system with MP extensions */
     bool mp_is_up;
 
+    /* Specify the number of cores in this CPU cluster. Used for the L2CTLR
+     * register.
+     */
+    int32_t core_count;
+
     /* The instance init functions for implementation-specific subclasses
      * set these fields to specify the implementation-dependent values of
      * various constant registers and reset values of non-constant
diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index 4228713b19..dd9ba973f7 100644
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -42,8 +42,10 @@ static inline void unset_feature(CPUARMState *env, int feature)
 #ifndef CONFIG_USER_ONLY
 static uint64_t a57_a53_l2ctlr_read(CPUARMState *env, const ARMCPRegInfo *ri)
 {
-    /* Number of processors is in [25:24]; otherwise we RAZ */
-    return (smp_cpus - 1) << 24;
+    ARMCPU *cpu = arm_env_get_cpu(env);
+
+    /* Number of cores is in [25:24]; otherwise we RAZ */
+    return (cpu->core_count - 1) << 24;
 }
 #endif