[PATCH v5 15/20] x86: move cpu plug from pc to x86

[Gerd Hoffmann]

The cpu hotplug code handles the initialization of coldplugged cpus
too, so it is needed even in case cpu hotplug is not supported.

Move the code from pc to x86, so microvm can use it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 include/hw/i386/x86.h |   6 ++
 hw/i386/pc.c          | 234 ++----------------------------------------
 hw/i386/x86.c         | 222 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 234 insertions(+), 228 deletions(-)

diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h
index de74c831c3ab..23c964471802 100644
--- a/include/hw/i386/x86.h
+++ b/include/hw/i386/x86.h
@@ -102,6 +102,12 @@ CpuInstanceProperties x86_cpu_index_to_props(MachineState 
*ms,
                                              unsigned cpu_index);
 int64_t x86_get_default_cpu_node_id(const MachineState *ms, int idx);
 const CPUArchIdList *x86_possible_cpu_arch_ids(MachineState *ms);
+CPUArchId *x86_find_cpu_slot(MachineState *ms, uint32_t id, int *idx);
+void x86_rtc_set_cpus_count(ISADevice *rtc, uint16_t cpus_count);
+void x86_cpu_pre_plug(HotplugHandler *hotplug_dev,
+                      DeviceState *dev, Error **errp);
+void x86_cpu_plug(HotplugHandler *hotplug_dev,
+                  DeviceState *dev, Error **errp);
 
 void x86_bios_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw);
 
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 98d29ead09b0..14036fcd4e3a 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -798,19 +798,6 @@ void pc_hot_add_cpu(MachineState *ms, const int64_t id, 
Error **errp)
     }
 }
 
-static void rtc_set_cpus_count(ISADevice *rtc, uint16_t cpus_count)
-{
-    if (cpus_count > 0xff) {
-        /* If the number of CPUs can't be represented in 8 bits, the
-         * BIOS must use "FW_CFG_NB_CPUS". Set RTC field to 0 just
-         * to make old BIOSes fail more predictably.
-         */
-        rtc_set_memory(rtc, 0x5f, 0);
-    } else {
-        rtc_set_memory(rtc, 0x5f, cpus_count - 1);
-    }
-}
-
 static
 void pc_machine_done(Notifier *notifier, void *data)
 {
@@ -820,7 +807,7 @@ void pc_machine_done(Notifier *notifier, void *data)
     PCIBus *bus = pcms->bus;
 
     /* set the number of CPUs */
-    rtc_set_cpus_count(x86ms->rtc, x86ms->boot_cpus);
+    x86_rtc_set_cpus_count(x86ms->rtc, x86ms->boot_cpus);
 
     if (bus) {
         int extra_hosts = 0;
@@ -1373,62 +1360,6 @@ static void pc_memory_unplug(HotplugHandler *hotplug_dev,
     error_propagate(errp, local_err);
 }
 
-static int pc_apic_cmp(const void *a, const void *b)
-{
-   CPUArchId *apic_a = (CPUArchId *)a;
-   CPUArchId *apic_b = (CPUArchId *)b;
-
-   return apic_a->arch_id - apic_b->arch_id;
-}
-
-/* returns pointer to CPUArchId descriptor that matches CPU's apic_id
- * in ms->possible_cpus->cpus, if ms->possible_cpus->cpus has no
- * entry corresponding to CPU's apic_id returns NULL.
- */
-static CPUArchId *pc_find_cpu_slot(MachineState *ms, uint32_t id, int *idx)
-{
-    CPUArchId apic_id, *found_cpu;
-
-    apic_id.arch_id = id;
-    found_cpu = bsearch(&apic_id, ms->possible_cpus->cpus,
-        ms->possible_cpus->len, sizeof(*ms->possible_cpus->cpus),
-        pc_apic_cmp);
-    if (found_cpu && idx) {
-        *idx = found_cpu - ms->possible_cpus->cpus;
-    }
-    return found_cpu;
-}
-
-static void pc_cpu_plug(HotplugHandler *hotplug_dev,
-                        DeviceState *dev, Error **errp)
-{
-    CPUArchId *found_cpu;
-    Error *local_err = NULL;
-    X86CPU *cpu = X86_CPU(dev);
-    PCMachineState *pcms = PC_MACHINE(hotplug_dev);
-    X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
-
-    if (x86ms->acpi_dev) {
-        hotplug_handler_plug(x86ms->acpi_dev, dev, &local_err);
-        if (local_err) {
-            goto out;
-        }
-    }
-
-    /* increment the number of CPUs */
-    x86ms->boot_cpus++;
-    if (x86ms->rtc) {
-        rtc_set_cpus_count(x86ms->rtc, x86ms->boot_cpus);
-    }
-    if (x86ms->fw_cfg) {
-        fw_cfg_modify_i16(x86ms->fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus);
-    }
-
-    found_cpu = pc_find_cpu_slot(MACHINE(pcms), cpu->apic_id, NULL);
-    found_cpu->cpu = OBJECT(dev);
-out:
-    error_propagate(errp, local_err);
-}
 static void pc_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
                                      DeviceState *dev, Error **errp)
 {
@@ -1443,7 +1374,7 @@ static void pc_cpu_unplug_request_cb(HotplugHandler 
*hotplug_dev,
         goto out;
     }
 
-    pc_find_cpu_slot(MACHINE(pcms), cpu->apic_id, &idx);
+    x86_find_cpu_slot(MACHINE(pcms), cpu->apic_id, &idx);
     assert(idx != -1);
     if (idx == 0) {
         error_setg(&local_err, "Boot CPU is unpluggable");
@@ -1475,172 +1406,19 @@ static void pc_cpu_unplug_cb(HotplugHandler 
*hotplug_dev,
         goto out;
     }
 
-    found_cpu = pc_find_cpu_slot(MACHINE(pcms), cpu->apic_id, NULL);
+    found_cpu = x86_find_cpu_slot(MACHINE(pcms), cpu->apic_id, NULL);
     found_cpu->cpu = NULL;
     qdev_unrealize(dev);
 
     /* decrement the number of CPUs */
     x86ms->boot_cpus--;
     /* Update the number of CPUs in CMOS */
-    rtc_set_cpus_count(x86ms->rtc, x86ms->boot_cpus);
+    x86_rtc_set_cpus_count(x86ms->rtc, x86ms->boot_cpus);
     fw_cfg_modify_i16(x86ms->fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus);
  out:
     error_propagate(errp, local_err);
 }
 
-static void pc_cpu_pre_plug(HotplugHandler *hotplug_dev,
-                            DeviceState *dev, Error **errp)
-{
-    int idx;
-    CPUState *cs;
-    CPUArchId *cpu_slot;
-    X86CPUTopoIDs topo_ids;
-    X86CPU *cpu = X86_CPU(dev);
-    CPUX86State *env = &cpu->env;
-    MachineState *ms = MACHINE(hotplug_dev);
-    PCMachineState *pcms = PC_MACHINE(hotplug_dev);
-    X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
-    unsigned int smp_cores = ms->smp.cores;
-    unsigned int smp_threads = ms->smp.threads;
-    X86CPUTopoInfo topo_info;
-
-    if(!object_dynamic_cast(OBJECT(cpu), ms->cpu_type)) {
-        error_setg(errp, "Invalid CPU type, expected cpu type: '%s'",
-                   ms->cpu_type);
-        return;
-    }
-
-    init_topo_info(&topo_info, x86ms);
-
-    env->nr_dies = x86ms->smp_dies;
-    env->nr_nodes = topo_info.nodes_per_pkg;
-    env->pkg_offset = x86ms->apicid_pkg_offset(&topo_info);
-
-    /*
-     * If APIC ID is not set,
-     * set it based on socket/die/core/thread properties.
-     */
-    if (cpu->apic_id == UNASSIGNED_APIC_ID) {
-        int max_socket = (ms->smp.max_cpus - 1) /
-                                smp_threads / smp_cores / x86ms->smp_dies;
-
-        /*
-         * die-id was optional in QEMU 4.0 and older, so keep it optional
-         * if there's only one die per socket.
-         */
-        if (cpu->die_id < 0 && x86ms->smp_dies == 1) {
-            cpu->die_id = 0;
-        }
-
-        if (cpu->socket_id < 0) {
-            error_setg(errp, "CPU socket-id is not set");
-            return;
-        } else if (cpu->socket_id > max_socket) {
-            error_setg(errp, "Invalid CPU socket-id: %u must be in range 0:%u",
-                       cpu->socket_id, max_socket);
-            return;
-        }
-        if (cpu->die_id < 0) {
-            error_setg(errp, "CPU die-id is not set");
-            return;
-        } else if (cpu->die_id > x86ms->smp_dies - 1) {
-            error_setg(errp, "Invalid CPU die-id: %u must be in range 0:%u",
-                       cpu->die_id, x86ms->smp_dies - 1);
-            return;
-        }
-        if (cpu->core_id < 0) {
-            error_setg(errp, "CPU core-id is not set");
-            return;
-        } else if (cpu->core_id > (smp_cores - 1)) {
-            error_setg(errp, "Invalid CPU core-id: %u must be in range 0:%u",
-                       cpu->core_id, smp_cores - 1);
-            return;
-        }
-        if (cpu->thread_id < 0) {
-            error_setg(errp, "CPU thread-id is not set");
-            return;
-        } else if (cpu->thread_id > (smp_threads - 1)) {
-            error_setg(errp, "Invalid CPU thread-id: %u must be in range 0:%u",
-                       cpu->thread_id, smp_threads - 1);
-            return;
-        }
-
-        topo_ids.pkg_id = cpu->socket_id;
-        topo_ids.die_id = cpu->die_id;
-        topo_ids.core_id = cpu->core_id;
-        topo_ids.smt_id = cpu->thread_id;
-        cpu->apic_id = x86ms->apicid_from_topo_ids(&topo_info, &topo_ids);
-    }
-
-    cpu_slot = pc_find_cpu_slot(MACHINE(pcms), cpu->apic_id, &idx);
-    if (!cpu_slot) {
-        MachineState *ms = MACHINE(pcms);
-
-        x86ms->topo_ids_from_apicid(cpu->apic_id, &topo_info, &topo_ids);
-        error_setg(errp,
-            "Invalid CPU [socket: %u, die: %u, core: %u, thread: %u] with"
-            " APIC ID %" PRIu32 ", valid index range 0:%d",
-            topo_ids.pkg_id, topo_ids.die_id, topo_ids.core_id, 
topo_ids.smt_id,
-            cpu->apic_id, ms->possible_cpus->len - 1);
-        return;
-    }
-
-    if (cpu_slot->cpu) {
-        error_setg(errp, "CPU[%d] with APIC ID %" PRIu32 " exists",
-                   idx, cpu->apic_id);
-        return;
-    }
-
-    /* if 'address' properties socket-id/core-id/thread-id are not set, set 
them
-     * so that machine_query_hotpluggable_cpus would show correct values
-     */
-    /* TODO: move socket_id/core_id/thread_id checks into x86_cpu_realizefn()
-     * once -smp refactoring is complete and there will be CPU private
-     * CPUState::nr_cores and CPUState::nr_threads fields instead of globals */
-    x86ms->topo_ids_from_apicid(cpu->apic_id, &topo_info, &topo_ids);
-    if (cpu->socket_id != -1 && cpu->socket_id != topo_ids.pkg_id) {
-        error_setg(errp, "property socket-id: %u doesn't match set apic-id:"
-            " 0x%x (socket-id: %u)", cpu->socket_id, cpu->apic_id,
-            topo_ids.pkg_id);
-        return;
-    }
-    cpu->socket_id = topo_ids.pkg_id;
-
-    if (cpu->die_id != -1 && cpu->die_id != topo_ids.die_id) {
-        error_setg(errp, "property die-id: %u doesn't match set apic-id:"
-            " 0x%x (die-id: %u)", cpu->die_id, cpu->apic_id, topo_ids.die_id);
-        return;
-    }
-    cpu->die_id = topo_ids.die_id;
-
-    if (cpu->core_id != -1 && cpu->core_id != topo_ids.core_id) {
-        error_setg(errp, "property core-id: %u doesn't match set apic-id:"
-            " 0x%x (core-id: %u)", cpu->core_id, cpu->apic_id,
-            topo_ids.core_id);
-        return;
-    }
-    cpu->core_id = topo_ids.core_id;
-
-    if (cpu->thread_id != -1 && cpu->thread_id != topo_ids.smt_id) {
-        error_setg(errp, "property thread-id: %u doesn't match set apic-id:"
-            " 0x%x (thread-id: %u)", cpu->thread_id, cpu->apic_id,
-            topo_ids.smt_id);
-        return;
-    }
-    cpu->thread_id = topo_ids.smt_id;
-
-    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_VPINDEX) &&
-        !kvm_hv_vpindex_settable()) {
-        error_setg(errp, "kernel doesn't allow setting HyperV VP_INDEX");
-        return;
-    }
-
-    cs = CPU(cpu);
-    cs->cpu_index = idx;
-
-    numa_cpu_pre_plug(cpu_slot, dev, errp);
-}
-
 static void pc_virtio_pmem_pci_pre_plug(HotplugHandler *hotplug_dev,
                                         DeviceState *dev, Error **errp)
 {
@@ -1706,7 +1484,7 @@ static void pc_machine_device_pre_plug_cb(HotplugHandler 
*hotplug_dev,
     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         pc_memory_pre_plug(hotplug_dev, dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
-        pc_cpu_pre_plug(hotplug_dev, dev, errp);
+        x86_cpu_pre_plug(hotplug_dev, dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_PMEM_PCI)) {
         pc_virtio_pmem_pci_pre_plug(hotplug_dev, dev, errp);
     }
@@ -1718,7 +1496,7 @@ static void pc_machine_device_plug_cb(HotplugHandler 
*hotplug_dev,
     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         pc_memory_plug(hotplug_dev, dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
-        pc_cpu_plug(hotplug_dev, dev, errp);
+        x86_cpu_plug(hotplug_dev, dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_PMEM_PCI)) {
         pc_virtio_pmem_pci_plug(hotplug_dev, dev, errp);
     }
diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 2d2beff3d4f6..b11fcb90b9cd 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -41,6 +41,7 @@
 #include "hw/i386/topology.h"
 #include "hw/i386/fw_cfg.h"
 #include "hw/intc/i8259.h"
+#include "hw/rtc/mc146818rtc.h"
 
 #include "hw/acpi/cpu_hotplug.h"
 #include "hw/irq.h"
@@ -168,6 +169,227 @@ void x86_cpus_init(X86MachineState *x86ms, int 
default_cpu_version)
     }
 }
 
+void x86_cpu_pre_plug(HotplugHandler *hotplug_dev,
+                      DeviceState *dev, Error **errp)
+{
+    int idx;
+    CPUState *cs;
+    CPUArchId *cpu_slot;
+    X86CPUTopoIDs topo_ids;
+    X86CPU *cpu = X86_CPU(dev);
+    CPUX86State *env = &cpu->env;
+    MachineState *ms = MACHINE(hotplug_dev);
+    X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
+    unsigned int smp_cores = ms->smp.cores;
+    unsigned int smp_threads = ms->smp.threads;
+    X86CPUTopoInfo topo_info;
+
+    if(!object_dynamic_cast(OBJECT(cpu), ms->cpu_type)) {
+        error_setg(errp, "Invalid CPU type, expected cpu type: '%s'",
+                   ms->cpu_type);
+        return;
+    }
+
+    init_topo_info(&topo_info, x86ms);
+
+    env->nr_dies = x86ms->smp_dies;
+    env->nr_nodes = topo_info.nodes_per_pkg;
+    env->pkg_offset = x86ms->apicid_pkg_offset(&topo_info);
+
+    /*
+     * If APIC ID is not set,
+     * set it based on socket/die/core/thread properties.
+     */
+    if (cpu->apic_id == UNASSIGNED_APIC_ID) {
+        int max_socket = (ms->smp.max_cpus - 1) /
+                                smp_threads / smp_cores / x86ms->smp_dies;
+
+        /*
+         * die-id was optional in QEMU 4.0 and older, so keep it optional
+         * if there's only one die per socket.
+         */
+        if (cpu->die_id < 0 && x86ms->smp_dies == 1) {
+            cpu->die_id = 0;
+        }
+
+        if (cpu->socket_id < 0) {
+            error_setg(errp, "CPU socket-id is not set");
+            return;
+        } else if (cpu->socket_id > max_socket) {
+            error_setg(errp, "Invalid CPU socket-id: %u must be in range 0:%u",
+                       cpu->socket_id, max_socket);
+            return;
+        }
+        if (cpu->die_id < 0) {
+            error_setg(errp, "CPU die-id is not set");
+            return;
+        } else if (cpu->die_id > x86ms->smp_dies - 1) {
+            error_setg(errp, "Invalid CPU die-id: %u must be in range 0:%u",
+                       cpu->die_id, x86ms->smp_dies - 1);
+            return;
+        }
+        if (cpu->core_id < 0) {
+            error_setg(errp, "CPU core-id is not set");
+            return;
+        } else if (cpu->core_id > (smp_cores - 1)) {
+            error_setg(errp, "Invalid CPU core-id: %u must be in range 0:%u",
+                       cpu->core_id, smp_cores - 1);
+            return;
+        }
+        if (cpu->thread_id < 0) {
+            error_setg(errp, "CPU thread-id is not set");
+            return;
+        } else if (cpu->thread_id > (smp_threads - 1)) {
+            error_setg(errp, "Invalid CPU thread-id: %u must be in range 0:%u",
+                       cpu->thread_id, smp_threads - 1);
+            return;
+        }
+
+        topo_ids.pkg_id = cpu->socket_id;
+        topo_ids.die_id = cpu->die_id;
+        topo_ids.core_id = cpu->core_id;
+        topo_ids.smt_id = cpu->thread_id;
+        cpu->apic_id = x86ms->apicid_from_topo_ids(&topo_info, &topo_ids);
+    }
+
+    cpu_slot = x86_find_cpu_slot(MACHINE(x86ms), cpu->apic_id, &idx);
+    if (!cpu_slot) {
+        MachineState *ms = MACHINE(x86ms);
+
+        x86ms->topo_ids_from_apicid(cpu->apic_id, &topo_info, &topo_ids);
+        error_setg(errp,
+            "Invalid CPU [socket: %u, die: %u, core: %u, thread: %u] with"
+            " APIC ID %" PRIu32 ", valid index range 0:%d",
+            topo_ids.pkg_id, topo_ids.die_id, topo_ids.core_id, 
topo_ids.smt_id,
+            cpu->apic_id, ms->possible_cpus->len - 1);
+        return;
+    }
+
+    if (cpu_slot->cpu) {
+        error_setg(errp, "CPU[%d] with APIC ID %" PRIu32 " exists",
+                   idx, cpu->apic_id);
+        return;
+    }
+
+    /* if 'address' properties socket-id/core-id/thread-id are not set, set 
them
+     * so that machine_query_hotpluggable_cpus would show correct values
+     */
+    /* TODO: move socket_id/core_id/thread_id checks into x86_cpu_realizefn()
+     * once -smp refactoring is complete and there will be CPU private
+     * CPUState::nr_cores and CPUState::nr_threads fields instead of globals */
+    x86ms->topo_ids_from_apicid(cpu->apic_id, &topo_info, &topo_ids);
+    if (cpu->socket_id != -1 && cpu->socket_id != topo_ids.pkg_id) {
+        error_setg(errp, "property socket-id: %u doesn't match set apic-id:"
+            " 0x%x (socket-id: %u)", cpu->socket_id, cpu->apic_id,
+            topo_ids.pkg_id);
+        return;
+    }
+    cpu->socket_id = topo_ids.pkg_id;
+
+    if (cpu->die_id != -1 && cpu->die_id != topo_ids.die_id) {
+        error_setg(errp, "property die-id: %u doesn't match set apic-id:"
+            " 0x%x (die-id: %u)", cpu->die_id, cpu->apic_id, topo_ids.die_id);
+        return;
+    }
+    cpu->die_id = topo_ids.die_id;
+
+    if (cpu->core_id != -1 && cpu->core_id != topo_ids.core_id) {
+        error_setg(errp, "property core-id: %u doesn't match set apic-id:"
+            " 0x%x (core-id: %u)", cpu->core_id, cpu->apic_id,
+            topo_ids.core_id);
+        return;
+    }
+    cpu->core_id = topo_ids.core_id;
+
+    if (cpu->thread_id != -1 && cpu->thread_id != topo_ids.smt_id) {
+        error_setg(errp, "property thread-id: %u doesn't match set apic-id:"
+            " 0x%x (thread-id: %u)", cpu->thread_id, cpu->apic_id,
+            topo_ids.smt_id);
+        return;
+    }
+    cpu->thread_id = topo_ids.smt_id;
+
+    if (hyperv_feat_enabled(cpu, HYPERV_FEAT_VPINDEX) &&
+        !kvm_hv_vpindex_settable()) {
+        error_setg(errp, "kernel doesn't allow setting HyperV VP_INDEX");
+        return;
+    }
+
+    cs = CPU(cpu);
+    cs->cpu_index = idx;
+
+    numa_cpu_pre_plug(cpu_slot, dev, errp);
+}
+
+void x86_rtc_set_cpus_count(ISADevice *rtc, uint16_t cpus_count)
+{
+    if (cpus_count > 0xff) {
+        /* If the number of CPUs can't be represented in 8 bits, the
+         * BIOS must use "FW_CFG_NB_CPUS". Set RTC field to 0 just
+         * to make old BIOSes fail more predictably.
+         */
+        rtc_set_memory(rtc, 0x5f, 0);
+    } else {
+        rtc_set_memory(rtc, 0x5f, cpus_count - 1);
+    }
+}
+
+static int x86_apic_cmp(const void *a, const void *b)
+{
+   CPUArchId *apic_a = (CPUArchId *)a;
+   CPUArchId *apic_b = (CPUArchId *)b;
+
+   return apic_a->arch_id - apic_b->arch_id;
+}
+
+/* returns pointer to CPUArchId descriptor that matches CPU's apic_id
+ * in ms->possible_cpus->cpus, if ms->possible_cpus->cpus has no
+ * entry corresponding to CPU's apic_id returns NULL.
+ */
+CPUArchId *x86_find_cpu_slot(MachineState *ms, uint32_t id, int *idx)
+{
+    CPUArchId apic_id, *found_cpu;
+
+    apic_id.arch_id = id;
+    found_cpu = bsearch(&apic_id, ms->possible_cpus->cpus,
+        ms->possible_cpus->len, sizeof(*ms->possible_cpus->cpus),
+        x86_apic_cmp);
+    if (found_cpu && idx) {
+        *idx = found_cpu - ms->possible_cpus->cpus;
+    }
+    return found_cpu;
+}
+
+void x86_cpu_plug(HotplugHandler *hotplug_dev,
+                  DeviceState *dev, Error **errp)
+{
+    CPUArchId *found_cpu;
+    Error *local_err = NULL;
+    X86CPU *cpu = X86_CPU(dev);
+    X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
+
+    if (x86ms->acpi_dev) {
+        hotplug_handler_plug(x86ms->acpi_dev, dev, &local_err);
+        if (local_err) {
+            goto out;
+        }
+    }
+
+    /* increment the number of CPUs */
+    x86ms->boot_cpus++;
+    if (x86ms->rtc) {
+        x86_rtc_set_cpus_count(x86ms->rtc, x86ms->boot_cpus);
+    }
+    if (x86ms->fw_cfg) {
+        fw_cfg_modify_i16(x86ms->fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus);
+    }
+
+    found_cpu = x86_find_cpu_slot(MACHINE(x86ms), cpu->apic_id, NULL);
+    found_cpu->cpu = OBJECT(dev);
+out:
+    error_propagate(errp, local_err);
+}
+
 CpuInstanceProperties
 x86_cpu_index_to_props(MachineState *ms, unsigned cpu_index)
 {
-- 
2.18.4