[Xen-devel] Xeno Linux never pins L1 tables ?

[Satya <satyakiran@xxxxxxxxx>]

hi,
I'm developing my own 32-bit (no PAE) paravirtualized kernel for xen with Mini-OS as a starting point. I am currently working on process page table support (equivalent of arch/i386/mm/pgtable-xen.c) and mostly following Linux for the moment. I noticed that 
linux-2.6.18-xen never pins an L1 table (a pte), yet __pgd_pin() walks the page directory and gives up write access on the kernel mappings of pte pages and only pins the pgd page. How do set_pte() and set_pte_at() macros work if they are writing directly to the page table entires ? do we fault in the kernel to handle this ?!

thanks,
satya.


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