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What is the mode(User/Kernel) of the Operating System when a Page Table or TLB are being accessed?
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kernel

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any authentic resouce for its proof??
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I think usermode else we will need to go to kernel mode for every PT access. 

For kernel pages

Page tables for kernel pages have a special protection bit set, and the CPU must be in kernel mode to access these pages, to protect against rogue processes.

Ref: https://www.cse.iitb.ac.in/~mythili/teaching/cs347_autumn2016/notes/07-memory.pdf

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