Re: can QEMU's arm smmu model handle non-PCI devices?

[Eric Auger]

Hi Peter,
On 5/23/22 16:52, Peter Maydell wrote:
> Hi; in real hardware an SMMUv3 might be sat in front of any
> DMA-capable device. Putting one in front of a PCI bus is common
> but not the only use case. Does QEMU's SMMUv3 model handle that,
> or is the implementation currently restricted to only handling DMA
> from PCI devices?
only PCI is supported at the moment. IOMMU MR regions are only created
for PCI devices
(smmu_find_add_as() in hw/arm/smmu-common.c)

As a reminder, Chunming Li submitted several iterations of a series dedicated 
to that. See

https://patchew.org/QEMU/1629878922-173270-1-git-send-email-chunming_li1234@163.com/

It is not upstream though.

Thanks

Eric




>
> I ask because for the Realm Management Extension (aka Confidential
> Compute Architecture) we're going to need to put SMMUs in front of
> other devices (such as the GIC), so that their DMA is checked against
> the RME Granule Protection Tables. So if we don't currently handle
> non-PCI devices then that's a bit of extra preliminary work that we'll
> want to do :-)
>
> thanks
> -- PMM
>