This article explains what a vCPU is, how it differs from a physical CPU, the relationship between them, methods for calculating available vCPU counts based on sockets, cores, and threads, and outlines typical allocation, scheduling, and application scenarios in cloud and virtualization environments.
Tencent Cloud’s Hybrid vCPU research, presented at KVM Forum 2023, outlines a three‑stage roadmap from homogeneous cores to mixed x86, ARM, and RISC‑V CPUs, detailing how virtualizing heterogeneous topologies, frequencies, caches, and PMU features can boost VM performance, security, live‑migration flexibility, and data‑center utilization.
The article explains Deepin's aBos integrated machine solution, detailing its three‑layer virtualization architecture, the role of the aSV hypervisor built on Linux KVM and QEMU, and the mechanisms of CPU, memory, and I/O virtualization, including Type‑I and Type‑II hypervisors, vCPU scheduling, and hardware‑assisted techniques.
This guide explains processor affinity, shows how to isolate host CPUs using the isolcpus kernel parameter, and provides step‑by‑step commands to launch a KVM guest and bind its vCPU threads to dedicated CPUs with taskset, including verification techniques and useful tips.
