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[Xen-devel] A Problem with Page Cache in Xen

Recently I'm dong some reserch on xen and encounter a problem that I cannot solve temporarily.I need your help very much and the following is the question I would like to ask:
On a physical machine with xen virtualization platform installed ,VM A,VM B are VM C's virtual disks are all image files,among which VM A and VM B's virtual disks are QCOW2 format and VM C's disk is RAW format. And VM A and VM B's virtual disk image files are based on VM C's virtual disk image file.Now these three VMs are running on the same physical machine with xen installed. In the process of running VM A get a page data from VM C's virtual disk image file. After that ,VM B also need to get the same page data as VM A got just now.Under this situation, does VMM copy the page data from VM A's memory to VM B's memory or get the page data from VM C's virtual disk image file in the physical disk again? Or if I would like to figure out this problem,what shall I do?
Thank you for reading my email.Your reply including your proposal is precious for me.
Huazhong University of Science and Technology
Wuhan, 430074, China

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