[PATCH v17 08/12] qapi/s390x/cpu topology: set-cpu-topology qmp command

[Pierre Morel]

The modification of the CPU attributes are done through a monitor
command.

It allows to move the core inside the topology tree to optimize
the cache usage in the case the host's hypervisor previously
moved the CPU.

The same command allows to modify the CPU attributes modifiers
like polarization entitlement and the dedicated attribute to notify
the guest if the host admin modified scheduling or dedication of a vCPU.

With this knowledge the guest has the possibility to optimize the
usage of the vCPUs.

The command has a feature unstable for the moment.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
 qapi/machine-target.json |  37 ++++++++++++
 hw/s390x/cpu-topology.c  | 119 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 156 insertions(+)

diff --git a/qapi/machine-target.json b/qapi/machine-target.json
index a52cc32f09..43e82cf071 100644
--- a/qapi/machine-target.json
+++ b/qapi/machine-target.json
@@ -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:
 #
@@ -354,3 +356,38 @@
 { 'enum': 'CpuS390Polarization',
   'prefix': 'S390_CPU_POLARIZATION',
   'data': [ 'horizontal', 'vertical' ] }
+
+##
+# @set-cpu-topology:
+#
+# @core-id: the vCPU ID to be moved
+# @socket-id: optional destination socket where to move the vCPU
+# @book-id: optional destination book where to move the vCPU
+# @drawer-id: optional destination drawer where to move the vCPU
+# @entitlement: optional entitlement
+# @dedicated: optional, if the vCPU is dedicated to a real CPU
+#
+# Features:
+# @unstable: This command may still be modified.
+#
+# Modifies the topology by moving the CPU inside the topology
+# tree or by changing a modifier attribute of a CPU.
+# Default value for optional parameter is the current value
+# used by the CPU.
+#
+# Returns: Nothing on success, the reason on failure.
+#
+# Since: 8.0
+##
+{ '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' ] }
+}
diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c
index 9aa2baf45b..0bf0a3d36f 100644
--- a/hw/s390x/cpu-topology.c
+++ b/hw/s390x/cpu-topology.c
@@ -18,6 +18,7 @@
 #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.
@@ -301,6 +302,26 @@ static void s390_topology_add_core_to_socket(S390CPU *cpu, 
int drawer_id,
     }
 }
 
+/**
+ * s390_topology_need_report
+ * @cpu: Current cpu
+ * @drawer_id: future drawer ID
+ * @book_id: future book ID
+ * @socket_id: future socket ID
+ *
+ * A modified topology change report is needed if the
+ */
+static int 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
@@ -401,3 +422,101 @@ 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, uint16_t entitlement,
+                                 bool has_dedicated, bool dedicated,
+                                 Error **errp)
+{
+    MachineState *ms = current_machine;
+    S390CPU *cpu;
+    int report_needed;
+    ERRP_GUARD();
+
+    if (core_id >= ms->smp.max_cpus) {
+        error_setg(errp, "Core-id %d out of range!", core_id);
+        return;
+    }
+
+    cpu = (S390CPU *)ms->possible_cpus->cpus[core_id].cpu;
+    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_entitlement) {
+        entitlement = cpu->env.entitlement;
+    }
+    if (!has_dedicated) {
+        dedicated = cpu->env.dedicated;
+    }
+    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;
+    }
+
+    s390_topology_check(socket_id, book_id, drawer_id,
+                        entitlement, dedicated, errp);
+    if (*errp) {
+        return;
+    }
+
+    /* Move the CPU into its new socket */
+    s390_topology_add_core_to_socket(cpu, drawer_id, book_id,
+                                     socket_id, false, errp);
+    if (*errp) {
+        return;
+    }
+
+    /* Check if we 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;
+
+    /* Setup shadow and effective entitlement */
+    s390_normalize_entitlement(cpu);
+
+    /* 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)
+{
+    ERRP_GUARD();
+
+    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);
+}
-- 
2.31.1