Re: [PATCH 9/9] qemu: complete vhostuser + passt support

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 :)