Xen devel - Mar 2008 - can xc_translate_foreign_address() always work for kernel va under x86_64 PV?

Hi,
In xc_translate_foreign_address(), the page directory address comes from
vcpu''s cr3.

when the domains is running a user application, the cr3 should contain the
app''s page table.

Under x86_64 PV, kernel and user space are both under ring 3 and protection
is implemented via page protection, which means app''s page table has no
kernel space mappings.

So my question is: given a kernel''s virtual address, can this function
always return a valid mfn?

Thanks,
Weiming


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