On Thu, Dec 7, 2017 at 7:54 AM, Avi Cohen (A) <address@hidden> 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