Re: [Qemu-discuss] use DMA engines in the virtual machine

[Tony Su]

Although I wouldn't know anything about this personally and even more
so because you're running on somewhat unusual hardware.

A Google search "qemu dma" returns several useful results, of which I
think the following might help in your situation
http://stackoverflow.com/questions/14076153/kvm-dma-with-a-passthrough-device

In other words, I think you may need to research the capabilities of
the QEMU running on your system, not the Guest kernel.

Tony

On Sat, Aug 17, 2013 at 2:11 PM, Zheng Da <address@hidden> wrote:
> Hello,
>
> I try to develop a kernel module of using the DMA engine in the Intel
> processors. I have enabled kvm. When I boot the virtual machine, I
> found the DMA engine isn't enabled. I tried different CPU models, and
> it seems none of them has the DMA engine.
>
> The native processor is Xeon E5-462 and it has DMA engines. Is there
> anyway to enable the feature in the virtual machine as well? Or the
> virtual machine can only expose very standard functionality?
>
> Thanks,
> Da
>