Il 27/06/2014 04:08, Le Tan ha scritto:
1. In struct IOMMUTLBEntry, I think the addr_mask field should be the mask of the page offset, right? But I see different usages of this field. In spapr_tce_translate_iommu(), the addr_mask field is assigned with the mask of the page offset. However, in pbm_translate_iommu(), in the passthrough case, the addr_mask field seems to be assigned the mask of the page number. Is there any problem here?
The intended usage is the one of spapr_tce_translate_iommu(). In practice it doesn't matter, both work.
2. For q35, how to identify origination of DMA requests? The VT-d manual says we should use source-id(for PCI-Express devices, it is requester identifier) to map devices to domains. What is the related part in QEMU? Where can I get the source-id of a DMA request?
You need to create a different AddressSpace for each PCI bus or device. Paolo
