This tutorial walks through creating a Linux kernel character driver that simulates four GPIO devices, compiles the module, loads it to automatically generate /dev/mygpio0‑3 nodes, and provides a user‑space program to control the GPIO states via ioctl, including full build and cleanup steps.
This article walks through the registration of the KVM misc device in the Linux 5.9 kernel for arm64, explains how /dev/kvm is created via misc_register, and demonstrates a user‑space program that opens the device and uses an ioctl to retrieve the KVM API version, with detailed code analysis.
This article examines three Linux user‑kernel communication methods—ioctl, proc, and Netlink—by describing their principles, presenting experimental setups and code, measuring nanosecond‑level call latency, and offering guidance on selecting the most suitable mechanism for a project.
This article explains the KVM architecture, its interaction with QEMU, the step‑by‑step process of creating and running a virtual machine using ioctl calls, and the underlying source code structure that enables hardware‑assisted virtualization on Linux.
