SeaBIOS NVMe support

Hi, guys!

I wanna try to add NVMe support for SeaBIOS. But I have a problem: all addresses passed to NVMe ctrl (for example: queue addresses in ACQ and ASQ registers) are treated by controller as IO (not RAM).
Qemu 2.5.0: file exec.c: address_space_rw(): function memory_access_is_direct() returns false, but should be true. Am I missing smth, or it's special behaviour of SeaBios?

Have a nice day!

Best Regards,
Vladislav.

[Stefan Hajnoczi]

On Tue, Jan 26, 2016 at 1:17 PM, [e-mail]
 wrote:
> I wanna try to add NVMe support for SeaBIOS. But I have a problem: all
> addresses passed to NVMe ctrl (for example: queue addresses in ACQ and ASQ
> registers) are treated by controller as IO (not RAM).
>
> Qemu 2.5.0: file exec.c: address_space_rw(): function
> memory_access_is_direct() returns false, but should be true. Am I missing
> smth, or it’s special behaviour of SeaBios?

I don't understand your question.  QEMU emulates the NVMe controller
so the hardware registers are not guest RAM.  memory_region_is_ram()
should be false.

Can you explain what you are trying to do or post code?

Stefan