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QEMU MicroVM machine type: Difference between revisions
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(Created page with "The '''microvm''' is an x86 machine type in QEMU. The microvm is designed to be extremely minimalist and simplistic as possible, and to trim the "fat" of a regular QEMU VM. The machine is designed primarily for short-lived guests. ==Why?== Ordinarily, QEMU emulates a full computer with all of its peripherals, usually through the <code>i440fx</code> or <code>q35</code> machine types. The "microvm" skips this by using a machine modeled after [https://firecracker-micro...") |
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== Why? ==
Ordinarily, QEMU emulates a full computer with all of its peripherals, usually through the <code>i440fx</code> or <code>q35</code> machine types. The "microvm" skips this by using a machine modeled after [https://firecracker-microvm.github.io/ Firecracker]. microvm, for example, strips the machine of PCI and ACPI, and many of the other emulated devices are fully optional. This allows for a minimalistic machine that reduces the amount of things the hypervisor sets up and emulates, allowing it to have faster bootup times and less CPU/memory usage on the host.
== BIOS ==
It comes with and uses by default a custom BIOS, named <code>qboot</code>. qboot is specifically optimized to boot Linux as fast as possible and with as little instructions as possible. It's also possible to use the standard SeaBIOS as well.
== Example VM ==
Example start up command for a MicroVM:
<pre>
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