[Xen-devel] How to correctly copy from guest?

["K.C. Lee" <kcl.joseph@xxxxxxxxx>]

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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