Zero-copy receive path in virtio
Kalman Meth, Mike Rapoport, Joel Nider, Razya Ladelsky · 2017
In the KVM hypervisor, incoming packets from the network must pass through several objects in the Linux kernel before being delivered to the guest VM. Currently, both the hypervisor and the guest keep their own sets of buffers on the receive path. For large packets, the overall processing time is dominated by the copying of data from hypervisor buffers to guest buffers.