Xen devel - Oct 2010 - How to correctly copy from guest?

Hi,

I''m trying to read guest''s cr3 value.

The version of xen is 4.0.1.

What should I do? I tried adding hvm_copy_from_guest_virt in mov_to_cr but
it caused VM booting failure,
Then I tried hvm_copy_from_guest_virt_nofault.

Here is my code.

void mov_to_cr_do_01(void)
{
    unsigned long e_kcl = 0;
    //hvm_copy_from_guest_virt(&e_kcl, GUEST_FS_BASE, 4, PFEC_page_shared |
PFEC_user_mode);
    hvm_copy_from_guest_virt_nofault(&e_kcl, GUEST_FS_BASE, 4,
PFEC_page_shared | PFEC_user_mode);
}

Thank you.

Sincerely,

K.C.


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