@@ -4,6 +4,8 @@
# This work is licensed under the terms of the GNU GPL, version 2 or later.
# See the COPYING file in the top-level directory.
+{ 'include': 'machine-common.json' }
+
##
# @CpuModelInfo:
#
@@ -375,3 +377,43 @@
'data': [ 'horizontal', 'vertical' ],
'if': 'TARGET_S390X'
}
+
+##
+# @set-cpu-topology:
+#
+# Modifies the topology by moving the CPU inside the topology
+# tree or by changing a modifier attribute of a CPU.
+# Absent values will not be modified.
+#
+# @core-id: the vCPU ID to be moved
+#
+# @socket-id: destination socket to move the vCPU to
+#
+# @book-id: destination book to move the vCPU to
+#
+# @drawer-id: destination drawer to move the vCPU to
+#
+# @entitlement: entitlement to set
+#
+# @dedicated: whether the provisioning of real to virtual CPU is dedicated
+#
+# Features:
+#
+# @unstable: This command may still be modified.
+#
+# Returns: Nothing on success, the reason on failure.
+#
+# Since: 8.2
+##
+{ 'command': 'set-cpu-topology',
+ 'data': {
+ 'core-id': 'uint16',
+ '*socket-id': 'uint16',
+ '*book-id': 'uint16',
+ '*drawer-id': 'uint16',
+ '*entitlement': 'CpuS390Entitlement',
+ '*dedicated': 'bool'
+ },
+ 'features': [ 'unstable' ],
+ 'if': { 'all': [ 'TARGET_S390X' , 'CONFIG_KVM' ] }
+}
@@ -23,6 +23,7 @@
#include "target/s390x/cpu.h"
#include "hw/s390x/s390-virtio-ccw.h"
#include "hw/s390x/cpu-topology.h"
+#include "qapi/qapi-commands-machine-target.h"
/*
* s390_topology is used to keep the topology information.
@@ -257,6 +258,29 @@ static bool s390_topology_check(uint16_t socket_id, uint16_t book_id,
return true;
}
+/**
+ * s390_topology_need_report
+ * @cpu: Current cpu
+ * @drawer_id: future drawer ID
+ * @book_id: future book ID
+ * @socket_id: future socket ID
+ * @entitlement: future entitlement
+ * @dedicated: future dedicated
+ *
+ * A modified topology change report is needed if the topology
+ * tree or the topology attributes change.
+ */
+static bool s390_topology_need_report(S390CPU *cpu, int drawer_id,
+ int book_id, int socket_id,
+ uint16_t entitlement, bool dedicated)
+{
+ return cpu->env.drawer_id != drawer_id ||
+ cpu->env.book_id != book_id ||
+ cpu->env.socket_id != socket_id ||
+ cpu->env.entitlement != entitlement ||
+ cpu->env.dedicated != dedicated;
+}
+
/**
* s390_update_cpu_props:
* @ms: the machine state
@@ -325,3 +349,111 @@ void s390_topology_setup_cpu(MachineState *ms, S390CPU *cpu, Error **errp)
/* topology tree is reflected in props */
s390_update_cpu_props(ms, cpu);
}
+
+static void s390_change_topology(uint16_t core_id,
+ bool has_socket_id, uint16_t socket_id,
+ bool has_book_id, uint16_t book_id,
+ bool has_drawer_id, uint16_t drawer_id,
+ bool has_entitlement,
+ CpuS390Entitlement entitlement,
+ bool has_dedicated, bool dedicated,
+ Error **errp)
+{
+ MachineState *ms = current_machine;
+ int old_socket_entry;
+ int new_socket_entry;
+ bool report_needed;
+ S390CPU *cpu;
+
+ cpu = s390_cpu_addr2state(core_id);
+ if (!cpu) {
+ error_setg(errp, "Core-id %d does not exist!", core_id);
+ return;
+ }
+
+ /* Get attributes not provided from cpu and verify the new topology */
+ if (!has_socket_id) {
+ socket_id = cpu->env.socket_id;
+ }
+ if (!has_book_id) {
+ book_id = cpu->env.book_id;
+ }
+ if (!has_drawer_id) {
+ drawer_id = cpu->env.drawer_id;
+ }
+ if (!has_dedicated) {
+ dedicated = cpu->env.dedicated;
+ }
+
+ /*
+ * When the user specifies the entitlement as 'auto' on the command line,
+ * QEMU will set the entitlement as:
+ * Medium when the CPU is not dedicated.
+ * High when dedicated is true.
+ */
+ if (!has_entitlement || entitlement == S390_CPU_ENTITLEMENT_AUTO) {
+ if (dedicated) {
+ entitlement = S390_CPU_ENTITLEMENT_HIGH;
+ } else {
+ entitlement = S390_CPU_ENTITLEMENT_MEDIUM;
+ }
+ }
+
+ if (!s390_topology_check(socket_id, book_id, drawer_id,
+ entitlement, dedicated, errp)) {
+ return;
+ }
+
+ /* Check for space on new socket */
+ old_socket_entry = s390_socket_nb(cpu);
+ new_socket_entry = s390_socket_nb_from_ids(drawer_id, book_id, socket_id);
+
+ if (new_socket_entry != old_socket_entry) {
+ if (s390_topology.cores_per_socket[new_socket_entry] >=
+ ms->smp.cores) {
+ error_setg(errp, "No more space on this socket");
+ return;
+ }
+ /* Update the count of cores in sockets */
+ s390_topology.cores_per_socket[new_socket_entry] += 1;
+ s390_topology.cores_per_socket[old_socket_entry] -= 1;
+ }
+
+ /* Check if we will need to report the modified topology */
+ report_needed = s390_topology_need_report(cpu, drawer_id, book_id,
+ socket_id, entitlement,
+ dedicated);
+
+ /* All checks done, report new topology into the vCPU */
+ cpu->env.drawer_id = drawer_id;
+ cpu->env.book_id = book_id;
+ cpu->env.socket_id = socket_id;
+ cpu->env.dedicated = dedicated;
+ cpu->env.entitlement = entitlement;
+
+ /* topology tree is reflected in props */
+ s390_update_cpu_props(ms, cpu);
+
+ /* Advertise the topology change */
+ if (report_needed) {
+ s390_cpu_topology_set_changed(true);
+ }
+}
+
+void qmp_set_cpu_topology(uint16_t core,
+ bool has_socket, uint16_t socket,
+ bool has_book, uint16_t book,
+ bool has_drawer, uint16_t drawer,
+ bool has_entitlement, CpuS390Entitlement entitlement,
+ bool has_dedicated, bool dedicated,
+ Error **errp)
+{
+ if (!s390_has_topology()) {
+ error_setg(errp, "This machine doesn't support topology");
+ return;
+ }
+
+ s390_change_topology(core, has_socket, socket, has_book, book,
+ has_drawer, drawer, has_entitlement, entitlement,
+ has_dedicated, dedicated, errp);
+}