Avi Kivity wrote: > PICT PUNE wrote: >> In reference to the November 2008 todo list on Qumranet Website >> >> we are a group of college students working on this todo: >> >> *Add a qemu interface for sharing memory between guests. Using a pci >> device to expose the shared memory is probably a good starting point. >> * >> Can anyone suggest us some starting point or a possible approach for >> the same... > > Write a PCI device that exposes a BAR containing RAM. Implement the RAM > by mapping a shared memory segment or a file. Write a guest driver to > use this shared RAM. >
Or implement a virtio device that can advertise available shared memory segments. Have guest allocate its own memory to send to host that becomes the shared memory segment. Expose shared memory mappings via a virtual file system (similar to hugetlbfs or ramfs). Using PCI BARs implies static shared memory mappings. For a long running VM, you're likely to want to support dynamic shared memory mappings. Also exposing a simple signaling mechanism with this too would allow for shared ring queues to be implemented in userspace between guests. Regards, Anthony Liguori _______________________________________________ Virtualization mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/virtualization
