On Tue, 2011-05-17 at 10:01 +0200, Alexander Graf wrote: > I'm not sure I fully understand how this is supposed to work. If the > tables are kept inside the kernel, how does userspace get to know > where to DMA to?
The guest gets a dma range from the device-tree which is the range of device-side dma addresses it can use that correspond to the table. The guest kernel uses the normal linux iommu space allocator to allocate space in that region and uses H_PUT_TCE to populate the corresponding table entries. This is the same interface that is used for "real" iommu's with PCI devices btw. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
