Re: [Qemu-devel] MIPS: reading kernel memory when guest Linux is in user mode

[Igor R]

>> I try to use cpu_memory_rw_debug() to read from 0x8xxxxxxx kernel virtual
>> address, when the guest is in user mode. Obviously, it fails.
>> Is it possible to modify some control registers to allow such an access? I
>> tried to set/clear the kernel mode bits in CP0_Status, but it doesn't help.
>
> Rather than messing with the current state of the CPU, you
> probably want to use the helper functions for doing load/store
> to guest memory with a particular MMU index.


Could you please elaborate a bit more, what helper functions I should use?
I need to be able to read from the guest's kernel space, despite the
current ring.
(FWIW, I was able to do this using cpu_memory_rw_debug() on x86 and ARM.)

Thanks.