Re: [Qemu-devel] Dump guest page table inside QEMU makes system hang

[Wei-Ren Chen]

>   It's quite embarrassing. The code I posted before is buggy, and it dumps all
> 1024 * 1024 page table entries. It takes a lot of time, so that I think the
> system hangs. Attach is the code snipt what I am using, which works fine now.
> Another question is, I would like to know the hva corresponding to gpa (i.e.,
> the guest page pointed by guest pte). Do you happen to know there is such
> gpa2hva function in QEMU?

  I think I found one, cpu_physical_memory_map (exec.c). Below is how I
convert gpa to hva by using cpu_physical_memory_map.

    target_ulong pde_addr = (env->cr[3] + 32 * 4) & env->a20_mask;
    target_phys_addr_t len = 4;
    void *ptr = cpu_physical_memory_map(pde_addr, &len, 0);

The only thing I am not sure about is what value of len I should use.

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj