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.co...@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.
Thanks
