On Wed, Jun 19, 2013 at 04:29:48AM +0200, Marek Marczykowski-Górecki wrote: > Hi, > > Is there any zero-copy VM memory access API in libvirt? I see only > virDomainMemoryPeek function, which copy some memory from VM and do not permit > VM memory modifications. > What I'm looking for is xen xc_map_foreign_pages or > xc_gnttab_map_domain_grant_refs equivalent/wrapper. IOW map memory pages to > dom0 address space, without copy. I know that not every hypervisor supports > it, but it is useful to build a high-performance communication channel on top > of it.
The only way to access memory from libvirt is via virDomainMemoryPeek currently. QEMU has an 'ivshm' device for doing shared memory segments between VMs and/or host, which would be zero-copy but support for this has not yet been integrated in libvirt. Patches are welcome if anyone wants to add this though. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :| -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
