[RFC PATCH 09/12] qemu: implement cpu device hotplug on live level

[Zhu Guihua <zhugh.fnst@xxxxxxxxxxxxxx>]

This patch implements live hotplug of a cpu device.

Signed-off-by: Zhu Guihua <zhugh.fnst@xxxxxxxxxxxxxx>
---
 src/qemu/qemu_driver.c  |  6 ++++++
 src/qemu/qemu_hotplug.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/qemu/qemu_hotplug.h |  7 +++++++
 3 files changed, 68 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index a88f6b4..ddc7eeb 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -6995,6 +6995,12 @@ qemuDomainAttachDeviceLive(virDomainObjPtr vm,
         break;
 
     case VIR_DOMAIN_DEVICE_CPU:
+        ret = qemuDomainAttachCPUDevice(driver, vm,
+                                        dev->data.cpu);
+        if (!ret)
+            dev->data.cpu = NULL;
+        break;
+
     case VIR_DOMAIN_DEVICE_NONE:
     case VIR_DOMAIN_DEVICE_FS:
     case VIR_DOMAIN_DEVICE_INPUT:
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index f6d7667..bff0d14 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1541,6 +1541,61 @@ int qemuDomainAttachChrDevice(virQEMUDriverPtr driver,
     return ret;
 }
 
+int
+qemuDomainCPUInsert(virDomainDefPtr vmdef,
+                    virDomainCPUDefPtr cpu)
+{
+    if (virDomainCPUFind(vmdef, cpu)) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("cpu already exists"));
+        return -1;
+    }
+
+    if (virDomainCPUInsert(vmdef, cpu) < 0)
+        return -1;
+
+    return 0;
+}
+
+int qemuDomainAttachCPUDevice(virQEMUDriverPtr driver,
+                              virDomainObjPtr vm,
+                              virDomainCPUDefPtr cpu)
+{
+    int ret = -1;
+    char *devstr = NULL;
+    qemuDomainObjPrivatePtr priv = vm->privateData;
+    virDomainDefPtr vmdef = vm->def;
+
+    if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE)) {
+        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                       _("qemu does not support -device"));
+        goto cleanup;;
+    }
+
+    if (qemuAssignDeviceCPUAlias(vmdef, cpu, -1) < 0)
+        goto cleanup;
+
+    if (qemuBuildCPUDeviceStr(&devstr, cpu, priv->qemuCaps) < 0)
+        goto cleanup;
+
+    if (qemuDomainCPUInsert(vmdef, cpu) < 0)
+        goto cleanup;
+
+    qemuDomainObjEnterMonitor(driver, vm);
+    if (devstr && qemuMonitorAddDevice(priv->mon, devstr) < 0) {
+        qemuDomainObjExitMonitor(driver, vm);
+        goto cleanup;
+    }
+    qemuDomainObjExitMonitor(driver, vm);
+
+    ignore_value(virBitmapSetBit(vm->def->apic_id_map, cpu->apic_id));
+    ret = 0;
+
+ cleanup:
+    VIR_FREE(devstr);
+    return ret;
+}
+
 static int
 qemuDomainAttachHostUSBDevice(virQEMUDriverPtr driver,
                               virDomainObjPtr vm,
diff --git a/src/qemu/qemu_hotplug.h b/src/qemu/qemu_hotplug.h
index 19ab9a0..6cdead3 100644
--- a/src/qemu/qemu_hotplug.h
+++ b/src/qemu/qemu_hotplug.h
@@ -106,6 +106,13 @@ qemuDomainChrInsert(virDomainDefPtr vmdef,
 virDomainChrDefPtr
 qemuDomainChrRemove(virDomainDefPtr vmdef,
                     virDomainChrDefPtr chr);
+int
+qemuDomainAttachCPUDevice(virQEMUDriverPtr driver,
+                          virDomainObjPtr vm,
+                          virDomainCPUDefPtr cpu);
+int
+qemuDomainCPUInsert(virDomainDefPtr vmdef,
+                    virDomainCPUDefPtr cpu);
 
 int qemuDomainRemoveDevice(virQEMUDriverPtr driver,
                            virDomainObjPtr vm,
-- 
1.9.3

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