kvm创建虚拟机流程

创建虚拟机

#0  virDomainDefineXML (conn=0x696e80,
    xml=0x697b90 "<domain type='kvm'>\n  <name>kvm_win7</name>\n  <memory>2097152</memory>\n  <currentMemory>2097152</currentMemory>\n  <vcpu>2</vcpu>\n  <os>\n    <type arch='x86_64' machine='pc'>hvm</type>\n    <boot dev='c"...)
    at libvirt.c:7897
#1  0x0000000000427590 in cmdDefine (ctl=0x7fffffffe240,
    cmd=<optimized out>) at virsh.c:2696
#2  0x000000000041cd1e in vshCommandRun (ctl=0x7fffffffe240, cmd=0x696890)
    at virsh.c:18449
#3  0x000000000042e2d6 in main (argc=3, argv=0x7fffffffe498)
    at virsh.c:20052

remoteDomainDefineXML

#0  virDomainDefineXML (conn=0x7f7a88047160,
    xml=0x7f7a6c000a30 "<domain type='kvm'>\n  <name>kvm_win7</name>\n  <memory>2097152</memory>\n  <currentMemory>2097152</currentMemory>\n  <vcpu>2</vcpu>\n  <os>\n    <type arch='x86_64' machine='pc'>hvm</type>\n    <boot dev='c"...) at libvirt.c:7897
#1  0x00000000004486dd in remoteDispatchDomainDefineXML (server=0x7bf4e0,
    client=0x7c59d0, msg=0x7ca880, rerr=0x7f7a914c8bb0,
    args=0x7f7a6c001d70, ret=0x7f7a6c001dd0) at remote_dispatch.h:1010
#2  0x00000000004487f1 in remoteDispatchDomainDefineXMLHelper (
    server=0x7bf4e0, client=0x7c59d0, msg=0x7ca880, rerr=0x7f7a914c8bb0,
    args=0x7f7a6c001d70, ret=0x7f7a6c001dd0) at remote_dispatch.h:990
#3  0x00007f7a97e3076a in virNetServerProgramDispatchCall (prog=0x7ca6d0,
    server=0x7bf4e0, client=0x7c59d0, msg=0x7ca880)
    at rpc/virnetserverprogram.c:416
#4  0x00007f7a97e30ba7 in virNetServerProgramDispatch (prog=0x7ca6d0,
    server=0x7bf4e0, client=0x7c59d0, msg=0x7ca880)
    at rpc/virnetserverprogram.c:289
#5  0x00007f7a97e2bc18 in virNetServerHandleJob (jobOpaque=0x783660,
    opaque=0x7bf4e0) at rpc/virnetserver.c:168
#6  0x00007f7a97d37550 in virThreadPoolWorker (opaque=0x7807f0)
    at util/threadpool.c:144
#7  0x00007f7a97d36a71 in virThreadHelper (data=0x780750)
    at util/threads-pthread.c:161
#8  0x00007f7a9542df05 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f7a94d6953d in clone () from /lib64/libc.so.6

qemudDomainDefine

static virDomainPtr qemudDomainDefine(virConnectPtr conn, const char *xml) {
    struct qemud_driver *driver = conn->privateData;
    virDomainDefPtr def;
    virDomainObjPtr vm = NULL;
    virDomainPtr dom = NULL;
    virDomainEventPtr event = NULL;
    int dupVM;

    qemuDriverLock(driver);
检查xml配置文件内容是否合法
    if (!(def = virDomainDefParseString(driver->caps, xml,
                                        QEMU_EXPECTED_VIRT_TYPES,
                                        VIR_DOMAIN_XML_INACTIVE)))
        goto cleanup;

    进行安全管理校验
    if (virSecurityManagerVerify(driver->securityManager, def) < 0)
        goto cleanup;
    检查xml配置文件定义的虚拟机是否与已经创建的虚拟机冲突
    if ((dupVM = virDomainObjIsDuplicate(&driver->domains, def, 0)) < 0)
        goto cleanup;
规范qemu虚拟机类型
(gdb) p def->os.machine
$30 = 0x7f7a6c001b00 "pc-1.0"
    if (qemudCanonicalizeMachine(driver, def) < 0)
        goto cleanup;

qemuDomainAssignAddresses ->qemuDomainAssignPCIAddresses ->qemuCapsExtractVersionInfo
->virCommandRun ->virCommandRunAsync ->virExecWithHook

 

    为qemu域分配地址
    if (qemuDomainAssignAddresses(def) < 0)
        goto cleanup;

    if (!(vm = virDomainAssignDef(driver->caps,
                                  &driver->domains,
                                  def, false))) {
        goto cleanup;
    }
    def = NULL;
    vm->persistent = 1;
    对xml配置文件内容进行格式化后，保存到配置文件目录
    if (virDomainSaveConfig(driver->configDir,
                            vm->newDef ? vm->newDef : vm->def) < 0) {
        VIR_INFO("Defining domain '%s'", vm->def->name);
        qemuDomainRemoveInactive(driver, vm);
        vm = NULL;
        goto cleanup;
    }
生成创建虚拟机事件
    event = virDomainEventNewFromObj(vm,
                                     VIR_DOMAIN_EVENT_DEFINED,
                                     !dupVM ?
                                     VIR_DOMAIN_EVENT_DEFINED_ADDED :
                                     VIR_DOMAIN_EVENT_DEFINED_UPDATED);

VIR_INFO("Creating domain '%s'", vm->def->name);
创建对应当前虚拟机的域指针
    dom = virGetDomain(conn, vm->def->name, vm->def->uuid);
    if (dom) dom->id = vm->def->id;

cleanup:
    virDomainDefFree(def);
    if (vm)
        virDomainObjUnlock(vm);
    if (event)
        qemuDomainEventQueue(driver, event);
    qemuDriverUnlock(driver);
    return dom;
}

 

2013年5月24日上传