[Xen-devel] Copy-on write sharing

[zhangzhi <zhangzhi2022@xxxxxxxxxxx>]

Hi, list,

xen 4.0 release has said that it had a special feature of copy-on write
sharing of identical memory pages between VMs (HVM only). 
I just wanna know the source code that illustrate this feature. 
Is anyone have an idea about the this feature as well as its specific source
code? thanks. 

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