* Joerg Roedel (joro@xxxxxxxxxx) wrote: > >From device standpoint a MSI transaction is always a DMA memory write > to a given address range. The IOMMU-API should export a feature flag > whether it supports filtering on those transaction or not. We have that > today with the IOMMU_CAP_INTR_REMAP. I agree that the interface to get > this information is ugly because a domain is needed. But the interface > can be fixed. While doing this I suggest to rename that feature > IOMMU_CAP_INTR_ISOLATION or something like that. > VFIO can then check for this flag on module-load and refuse to load if > it is not available. I can see that the native grouping (the typical pci bridge type) is really more a property of the topology. The isolation properties of a group (arguably the whole point of the group) is subtly different. Leaves the questions: What is the value of a group w/out complete isolation? Is there a practical problem w/ conflating the subtleties above? thanks, -chris -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
