On 07/12/15 16:19, Stefano Stabellini wrote: > Hi all, > > this patch series introduces support for running Linux on top of Xen > inside a virtual machine with virtio devices (nested virt scenario). > The problem is that Linux virtio drivers use virt_to_phys to get the > guest pseudo-physical addresses to pass to the backend, which doesn't > work as expected on Xen. > > Switching the virtio drivers to the dma APIs (dma_alloc_coherent, > dma_map/unmap_single and dma_map/unmap_sg) would solve the problem, as > Xen support in Linux provides an implementation of the dma API which > takes care of the additional address conversions. However using the dma > API would increase the complexity of the non-Xen case too. We would also > need to keep track of the physical or virtual address in addition to the > dma address for each vring_desc to be able to free the memory in > detach_buf (see patch #3). > > Instead this series adds few obvious checks to perform address > translations in a couple of key places, without changing non-Xen code > paths. You are welcome to suggest improvements or alternative > implementations. Andy Lutomirski also looked at this. Andy what happened to this work? David _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
