On Fri, Jan 10, 2020 at 10:34 AM Marc-André Lureau <marcandre.lur...@gmail.com> wrote: > On Wed, Jan 8, 2020 at 5:57 AM V. <m...@winaoe.org> wrote:
Hi V., I think I remember you from Etherboot/gPXE days :). > > 3. > > Now if Cross Cable is actually a new and (after a code-rewrite of 10) a > > viable way to connect 2 QEMU's together, could I actually > > suggest a better way? > > I am thinking of a '-netdev vhost-user-slave' option to connect (as client > > or server) to a master QEMU running '-netdev vhost-user'. > > This way there is no need for any external program at all, the master can > > have it's memory unshared and everything would just work > > and be fast. > > Also the whole thing can fall back to normal virtio if memory is not shared > > and it would even work in pure usermode without any > > context switch. > > > > Building a patch for this idea I could maybe get around to, don't clearly > > have an idea how much work this would be but I've done > > crazier things. > > But is this is something that someone might be able to whip up in an hour > > or two? Someone who actually does have a clue about vhost > > and virtio maybe? ;-) > > I believe https://wiki.qemu.org/Features/VirtioVhostUser is what you > are after. It's still being discussed and non-trivial, but not very > active lately afaik. virtio-vhost-user is being experimented with in the SPDK community but there has been no activity on VIRTIO standardization or the QEMU patches for some time. More info here: https://ndragazis.github.io/spdk.html I think the new ivshmem v2 feature may provide the functionality you are looking for, but I haven't looked at them yet. Here is the link: https://www.mail-archive.com/qemu-devel@nongnu.org/msg668749.html And here is Jan's KVM Forum presentation on ivshmem v2: https://www.youtube.com/watch?v=TiZrngLUFMA Stefan
