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Post #42705 74
How KVM actually runs a virtual machine

I made a visual explainer on how Linux KVM works under the hood.

A vCPU is a host thread, guest RAM lives in the process, and KVM_RUN hands execution to the real CPU until the guest triggers a VM exit.

It also covers /dev/kvm, VT-x/AMD-V, EPT/NPT, QEMU, virtio and vhost.

link for anyone interested

Feedback welcome :)

https://redd.it/1uxba0e
@r_linux
YouTube You Don't Understand Virtual Machines Watch More Low Level Animated Deep Dives: https://youtube.com/playlist?list=PLMXMEKvLCzsI&si=TqIoC2dz4RkibIRk A virtual machine looks like a whole computer. Its own kernel, memory, disks, network devices, and CPUs. But on a Linux host, that entire machine…
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