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
