Il 18/01/2013 17:33, Luigi Rizzo ha scritto: >> > First, host memory mappings could change (though they rarely do on PC). >> > The result of address_space_map is not guaranteed to be stable. To >> > avoid problems with this, however, you could use something like >> > hw/dataplane/hostmem.c and even avoid address_space_map altogether. > I'll look into that. Hopefully there is something that i can > use as a notification that the mapping has changed...
Yes, that's the MemoryListener interface that hw/dataplane/hostmem.c uses. >> > Second, that pci_dma_*() could have the addresses translated by an >> > IOMMU. virtio is documented to have "real" physical memory addresses, >> > but this does not apply to other devices. > I see. I suppose the ability to have an iommu depends on the > specific NIC ? I am only planning to use the above shortcut for > e1000. It depends on the bus, in this case PCI. Paolo
