how to get PFN of page cache in guest OS?

[pravin jadav]

i want to develop the linux kernel module that detct PFN of page cache and
its corresponding disk block number.

so how to get PFN of page cache?.

i use this module in VM live migration and use KVM hypervisor.

i am trying to reduce total migration time.

instead of migrating page cache at remote host, pagecache restore from the
disk storage before VM resume at remote host.
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