[Xen-devel] Is it possible to change a guest domain's page table in Dom0's user space?

[weiming <zephyr.zhao@xxxxxxxxx>]

Hi,

I'm doing some experiments under x86_64 PV domains.

I want to change a page table of some process in a guest domain. 
And for easier programming, I want to do this in dom0 via libxc.

Now I can get the guest's kernel structs (like init_task, init_mm) via xc_map_foreign_range with R/W permissions. However, when I try to map the page table directory, I can only use "PROT_READ", otherwise, it gives a "Bad address" error. Why? 

any suggestions?

Thanks,
Weiming
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