2014-06-27 12:55 GMT+08:00 Paolo Bonzini <pbonz...@redhat.com>: > 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.
How to create a different AddressSpace for each device? I thought a AddressSpace just belongs to a PCI bus before. The paging structures for different functions of the same device can also be different, too. So maybe we should create a different AddressSpace for each function? How to achieve it? Could you give me some more hints or is there any existing example in QEMU? Thanks very much! Le > Paolo
