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docs: update virt/vm

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lukas 2025-06-03 06:15:16 +00:00
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@ -2,7 +2,7 @@
title: Machine definition
description: Virtual machine hardware
published: true
date: 2025-06-03T06:05:18.246Z
date: 2025-06-03T06:15:14.349Z
tags:
editor: markdown
dateCreated: 2025-06-01T17:37:29.262Z
@ -103,4 +103,35 @@ A memballon device is defined, which can release memory to the host and other vi
</domain>
```
What is also done is to mark the memory as shared memory, which is necessary for other features to work, like *virtiofs*.
What is also done is to mark the memory as shared memory, which is necessary for other features to work, like *virtiofs*.
## (v)CPU
There are multiple XML elements related to the (v)CPU, with many parameters for each of them.
the CPU allocation section defines the number of vCPU associated to the virtual machine. This number cannot exceed the total number of logical CPUs available in the host machine as well as the maximum number of that the KVM hypervisor can assign to a guest.
The number of logical CPUs is the number of physical cores multiply by the number of threads per core.
- In the following snippet, 4vCPU is assigned to the virtual machine
```
<domain type='kvm'>
[...]
<vcpu placement='static'>4</vcpu>
[...]
</domain>
```
Another very important element is the CPU mode.
```
<domain type='kvm'>
[...]
<cpu mode="host-passthrough" check="none" migratable="on">
<topology sockets="1" dies="1" cores="2" threads="2"/>
</cpu>
[...]
</domain>
```