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_li1...@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 >
