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qemu-kvm

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Use when running qemu-system-x86_64 with KVM, wiring virtio devices, passing a PCI device through with VFIO, driving QMP, using virsh or virt-install, or booting a kernel with -kernel and -append.

.devin/skills/qemu-kvm/SKILL.md

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Sep 28, 2026
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Apache-2.0

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# QEMU and KVM

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A Linux VM needs hardware acceleration, a custom kernel needs booting without bare metal, a GPU or NIC needs passing to a guest, or a guest needs snapshots or scripted control. |
| Authority | Reversible local. The write set is QEMU processes started for the session, disk images and snapshots in user-named files, QMP sockets, libvirt domain definitions, and a PCI device rebound to `vfio-pci`. Rollback is stopping the process, deleting the image or snapshot, undefining the domain, and rebinding the device to its original driver. Rebinding a device and using `/dev/kvm` need root or group membership. No remote mutation. |
| Side effect | A guest runs and may hold a passed-through device while the session lasts. |
| Done | The guest boots to the console with KVM active, or the kernel under test reaches the breakpoint or panic under study, and every started process and rebound device has its teardown recorded. |

## Inputs

- Goal (required): run an image, boot a kernel, pass through a device, or manage through libvirt.