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[Xen-devel] question about dynamically add block device

I try to understand the code relative to dynamically add block device in a running VM it seems like that device_creat()->createdevice()->addStoreEntries() ,add store entry into xenstore , then backend and frontend will watch and do several related work to real add-device in backend and frontend ,is it right? and xenstore have watches to check the related entry ,is it right? I am confused ,which code or function to the real adding work, I guess it is the watches do it ,but I cannot find that fucntions

could you help me
Thanks in advance

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