1 files changed, 83 insertions, 0 deletions
diff --git a/include/hw/s390x/cpu-topology.h b/include/hw/s390x/cpu-topology.h
new file mode 100644
index 0000000000..c064f427e9
--- /dev/null
+++ b/include/hw/s390x/cpu-topology.h
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * CPU Topology
+ *
+ * Copyright IBM Corp. 2022, 2023
+ * Author(s): Pierre Morel <pmorel@linux.ibm.com>
+ *
+ */
+#ifndef HW_S390X_CPU_TOPOLOGY_H
+#define HW_S390X_CPU_TOPOLOGY_H
+
+#ifndef CONFIG_USER_ONLY
+
+#include "qemu/queue.h"
+#include "hw/boards.h"
+#include "qapi/qapi-types-machine-target.h"
+
+#define S390_TOPOLOGY_CPU_IFL   0x03
+
+typedef struct S390TopologyId {
+    uint8_t sentinel;
+    uint8_t drawer;
+    uint8_t book;
+    uint8_t socket;
+    uint8_t type;
+    uint8_t vertical:1;
+    uint8_t entitlement:2;
+    uint8_t dedicated;
+    uint8_t origin;
+} S390TopologyId;
+
+typedef struct S390TopologyEntry {
+    QTAILQ_ENTRY(S390TopologyEntry) next;
+    S390TopologyId id;
+    uint64_t mask;
+} S390TopologyEntry;
+
+typedef struct S390Topology {
+    uint8_t *cores_per_socket;
+    CpuS390Polarization polarization;
+} S390Topology;
+
+typedef QTAILQ_HEAD(, S390TopologyEntry) S390TopologyList;
+
+#ifdef CONFIG_KVM
+bool s390_has_topology(void);
+void s390_topology_setup_cpu(MachineState *ms, S390CPU *cpu, Error **errp);
+void s390_topology_reset(void);
+#else
+static inline bool s390_has_topology(void)
+{
+    return false;
+}
+static inline void s390_topology_setup_cpu(MachineState *ms,
+                                           S390CPU *cpu,
+                                           Error **errp) {}
+static inline void s390_topology_reset(void)
+{
+    /* Unreachable, CPU topology not implemented for TCG */
+    assert(false);
+}
+#endif
+
+extern S390Topology s390_topology;
+
+static inline int s390_std_socket(int n, CpuTopology *smp)
+{
+    return (n / smp->cores) % smp->sockets;
+}
+
+static inline int s390_std_book(int n, CpuTopology *smp)
+{
+    return (n / (smp->cores * smp->sockets)) % smp->books;
+}
+
+static inline int s390_std_drawer(int n, CpuTopology *smp)
+{
+    return (n / (smp->cores * smp->sockets * smp->books)) % smp->drawers;
+}
+
+#endif /* CONFIG_USER_ONLY */
+
+#endif