On Fri, Feb 14, 2025 at 03:03:20AM -0800, Andrea Bolognani wrote: > On Thu, Feb 13, 2025 at 01:19:53PM -0500, Laine Stump wrote: > > The result is that you can now have: > > > > <interface type='vhostuser'> > > <backend type='passt'/> > > ... > > </interface> > > > > Then as long as you also have the following as a subelement of > > <domain>: > > > > <memoryBacking> > > <access mode='shared'/> > > </memoryBacking> > > > > your passt interfaces will benefit from the greatly improved > > efficiency of a vhost-user data path > > The presence of this element is not validated anywhere though, so if > you leave it out the network interface will just silently be > non-functional. I don't think that makes for a good user experience. > > How does passt know where the backing file is located in the first > place? It's not passed on its command line, and I didn't spot any > logic to hand the information over. This part clearly works, I just > don't understand how :) IIUC the vhost user protocol passes over a pre-opened FD for the memory region(s). With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
