virDomainAttachDevice->
remoteDomainAttachDevice->

libxlDomainAttachDevice-> libxlDomainAttachDeviceFlags
-> libxlDomainModifyDeviceFlags
-> libxlDomainAttachDeviceLive
-> libxlDomainAttachDeviceDiskLive
-> libxlMakeDisk

#0  libxlDomainAttachDevice (dom=0x7ffbb0,
    xml=0x7ec530 "    <disk type='block' device='disk'>\n      <driver name='phy'/>\n      <source dev='/dev/mapper/wy
f-3'/>\n      <target dev='xvdb' bus='xen'/>\n    </disk>\n\n\n") at libxl/libxl_driver.c:3424
#1  0x00007fb55be52913 in virDomainAttachDevice (domain=0x7ffbb0,
    xml=0x7ec530 "    <disk type='block' device='disk'>\n      <driver name='phy'/>\n      <source dev='/dev/mapper/wy
f-3'/>\n      <target dev='xvdb' bus='xen'/>\n    </disk>\n\n\n") at libvirt.c:9976
#2  0x0000000000448425 in remoteDispatchDomainAttachDevice (server=0x7b5710, client=0x7fb54c004470,
    msg=0x7fb54c048080, rerr=0x7fb5587b4ba0, args=0x7ffbf0) at remote_dispatch.h:320
#3  0x0000000000448512 in remoteDispatchDomainAttachDeviceHelper (server=0x7b5710, client=0x7fb54c004470,
    msg=0x7fb54c048080, rerr=0x7fb5587b4ba0, args=0x7ffbf0, ret=0x775bf0) at remote_dispatch.h:298
#4  0x00007fb55beb52f6 in virNetServerProgramDispatchCall (prog=0x7c07d0, server=0x7b5710, client=0x7fb54c004470,
msg=0x7fb54c048080) at rpc/virnetserverprogram.c:416
#5  0x00007fb55beb572c in virNetServerProgramDispatch (prog=0x7c07d0, server=0x7b5710, client=0x7fb54c004470,
    msg=0x7fb54c048080) at rpc/virnetserverprogram.c:289
#6  0x00007fb55beb20ed in virNetServerHandleJob (jobOpaque=0x7fb54c004990, opaque=0x7b5710) at rpc/virnetserver.c:164
#7  0x00007fb55bdc368d in virThreadPoolWorker (opaque=0x77a2f0) at util/threadpool.c:144
#8  0x00007fb55bdc2bcf in virThreadHelper (data=0x77a270) at util/threads-pthread.c:161
#9  0x00007fb5599905f0 in start_thread () from /lib64/libpthread.so.0
#10 0x00007fb5592f884d in clone () from /lib64/libc.so.6
#11 0x0000000000000000 in ?? ()