Re: How to get host virtual address from guest physical address?

[Peter Maydell]

On Fri, 28 May 2021 at 03:50, <ckim@etri.re.kr> wrote:
> In my baremetal test on aarch64, I pass the guest physical address of an 
> array of a structure to the qemu peripheral code using peripherals register.
>
> I soon realized the adderss is from another world and to access this address 
> in qemu, I need the host virtual address.
>
> I tried reading the document (and will read more) but it shows the load and 
> store APIs, and not the address translation API.
>
> I need that address because I have to pass the “address” to a function in a 
> dynamic library ( a .so file). I don’t myself load or store using that 
> address.
>
> What is the function for this “guest physical address to host virtual 
> address” translation?

There is address_space_map(), but watch out for the
caveats documented in its doc comment in memory.h.

thanks
-- PMM