从Linux内核/内核模块“附加”用户空间进程

Question

I want to modify the virtual-to-physical address mapping (ie page table) of a particular process for every 60 seconds. I do know how to modify the page table, how to flush the cache and TLB accordingly, and how to leverage workqueue to invoke my function every 60 seconds. However, I am not sure how to "attach" to the target process from kernel or kernel module, assuming that the target process does not initiate any system call. By "attach", I mean the target process will behave similar as when it encountered an interrupt (eg a page fault) and the execution goes to the kernel immediately with the context being saved. So is it possible to do this?

Pointers to any similar usage in the kernel code or other hints are also appreciated.

Answer 1

Your best bet is to have the process you are interested in applying dynamic virtual address, call in to the module via IOCTL or any other call that ends up in the driver, sleep in process context using wait_* functions and then wake it up every 60 seconds to modify the page table in that thread. You should have assured context then.