How to decode /proc/pid/pagemap entries in Linux?

Question

I am trying to decipher how to use /proc/pid/pagemap to get the physical address of a given set of pages. Suppose from the /proc/pid/maps, I get the virtual address afa2d000

Answer 1

In case folks want to do this from Rust, I've added a Rust implementation so you can easily navigate /proc/$pid/maps and /proc/$pid/pagemap: https://crates.io/crates/vm-info