Re: MFN on ARM

[Julien Grall <julien@xxxxxxx>]

Hi,

On 24/08/2020 15:23, luckybreak051779 wrote:
> Xen Team:
>
> I am running Xen 4.13.0 on a 32-bit ARM processor.  In a domU driver I 
> use the dma_map_single() function to obtain a DMA address.
> How can I get the MFN of that DMA address from inside the domU?
We don't provide a way to find the MFN from a Guest Physical Frame.

>   I need 
> the MFN to be able to differentiate between
> two identical domUs running the same driver code (e.g. both calling 
> dma_map_single() ).
Can you give more details of your setup? Are you trying to use the same 
physical device in two domUs?
Cheers,

--
Julien Grall