[Xen-devel] about cr3 register

[HANNAS YAYA Issa <issa.hannasyaya@xxxxxxxxxxx>]

Hi
I am working on memory management in xen. I encounter a problem that I 
hope you can help me to solve it.
I modified the struct mmu_update in xen and linux source code. I add 
two fields cr3 and addr which respectively contains the current cr3 
value and the current address of the process associated with the pte to 
be updated. the struct mmu_update is sent to the hyervisor via hypercall 
HYPERVISOR_do_mmu_update.
In the handler of this hypercall (I mean do_mmu_update) when I read the 
value of cr3 via the method read_cr3 it is different from the value I 
stored before in the struct mmu_update. I wonder why?

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