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[Xen-devel] DomU memory update procedures ?

Hi, I have a question about memory update of DomU. 
When DomU writes a new value to a memory address, how does hypervisor change
the value in the particular address and change the dirty page bit? 
In my current understanding, I find that there is a hypercal do_mmu_update
in the hypervisor changing the content in the memory. However, I want to
know the details about the memory update procedures. Or you can simply tell
me how can I find this procedures.
Thanks for your help. 

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