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Subject: RE: [Qemu-devel] [virtio-dev] virtio - mem-page swap for inter vm comm.
> On 2017年12月07日 16:04, Stefan Hajnoczi wrote: > > On Thu, Dec 7, 2017 at 7:54 AM, Avi Cohen (A) <avi.cohen@huawei.com> > wrote: > >> There is already a virtio mechanism in which 2 VMs assigned a virtio device > , are communicating via a veth pair in the host . > >> KVM just passes a pointer of the page of the writer VM to the reader > >> VM - resulting in excellent performance (no vSwitch in the middle) > >> **Question**: What is the advantage of vhost-pci compared to this ? > > Which mechanism do you mean? > > > > vhost-pci will allow VM-to-VM communication without vmexits when > > polling mode is used. Does the mechanism you are thinking about > > require vmexits? > > > > Stefan > > I guess what Avi means is probably veth tap support (RFC) here: > > https://www.spinics.net/lists/netdev/msg454040.html > > But in fact, we don't need veth at all, by using rx handler trick, we can easily > implement pair mode on TUN/TAP. > [Avi Cohen (A)] I changed the subject so as not to interfere with the original thread I am trying to find reference for the mem-page swapping mechanism - without success till now .. Best Regards Avi
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