How to Get the PA instead of IPA from NS OS Kernel Module of an AArch64 device?

Hi experts,

Recently I want to conduct one secure-related scanning in TrustZone for some NS kernel memory.

To do this, I need at first reporting the PA of the memory from NS kernel. My idea is developing a kernel module to achieve the goal.

I write the kernel module for NS OS looks like these:

static int test_value=1234;
volatile void *k_last_vaddr=NULL;

k_last_vaddr=(volatile void *)&test_value;
printk(KERN_INFO "\nTest value virtual ADDRESS: %p.\n",k_last_vaddr);
printk(KERN_INFO "Test value translated ADDRESS: %llx.\n",virt_to_phys(k_last_vaddr));

By running this kernel module, I get the following result:

[ 1298.691982] Test value virtual ADDRESS: ffffff80008d0758.                   
[ 1298.698825] Test value translated ADDRESS: 788d0758.  

I think the function virt_to_phys doesn't return me the real PA since the DRAM0's PA should start from 0x80000000.

After reading some related documents (e.g., the page 1-25 of this document), I find that for EL0 / EL1 applications, they could only translate VA to IPA while I'm not sure this is my case or not.

So I want to ask two things:

1) By using virt_to_phys in NS kernel module, do I get the PA or IPA of a variable?

2) If it's IPA, is that possible for me to report the real PA from NS side?

Thank you very much.

PS: I set up my Juno board according to the instruction .